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Old 10-13-2019, 03:52 PM   #16
ps67
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Old 10-13-2019, 09:51 PM   #17
kovidgoyal
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OK next step is to try to figure out the easiest/most consistent way to reproduce the crash so I can try to implement a workaround for it. Post an ebook file and set of steps that causes the crash as reliably as possible and I will debug.
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Old 10-14-2019, 01:56 AM   #18
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I opened the editor, the issue came when I opened css file, even without modify it, only seeing it, I try again:

1. opened file (normally, from calibre, not with debug, it is wrong?) and modified some xhtml file (written a casual letter): no issue
2. modified some xhtml file (substitution of <em> tag with <i> tag): no issue
3. opened css file: tried to substitute
Code:
.LLinfo {
font-family : "Courier New";
}
with
Code:
.LLinfo {
font-family : "Courier Prime";
}
Kicked off before saving.
But generally it is not necessary to change css file, it is enough open it and examine it, when selecting something is more likely to obtain the segmentation fault.

4. I opened the file again and imediately kicked off, may be because the file previously opened was css, I post the trace back.

Code:
ps@ps-Inspiron-3650:~$ echo bt | coredumpctl gdb                        
           PID: 3528 (open_book)
           UID: 1000 (ps)
           GID: 1000 (ps)
        Signal: 11 (SEGV)
     Timestamp: Mon 2019-10-14 06:55:20 CEST (20s ago)
  Command Line: /opt/calibre/bin/calibre-parallel
    Executable: /opt/calibre/bin/calibre-parallel
 Control Group: /user.slice/user-1000.slice/session-3.scope
          Unit: session-3.scope
         Slice: user-1000.slice
       Session: 3
     Owner UID: 1000 (ps)
       Boot ID: 60897caff5634982a21766c89c364036
    Machine ID: 511f79f717f34fabbda1f4c6b7101b7d
      Hostname: ps-Inspiron-3650
       Storage: /var/lib/systemd/coredump/core.open_book.1000.60897caff5634982a21766c89c364036.3528.1571028920000000.lz4
       Message: Process 3528 (open_book) of user 1000 dumped core.
                
                Stack trace of thread 3528:
                #0  0x00007f984ec1c779 _ZNK11QTextFormat14stringPropertyEi (libQt5Gui.so.5)
                #1  0x00007f984f1368b7 n/a (QtGui.so)
                #2  0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #3  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #4  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #7  0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #8  0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #9  0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #10 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #11 0x00007f984f58e6dd n/a (sip.so)
                #12 0x00007f984f58e919 n/a (sip.so)
                #13 0x00007f984d3c8fcb n/a (QtWidgets.so)
                #14 0x00007f984d4bcd9b n/a (QtWidgets.so)
                #15 0x00007f984cd56d3c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #16 0x00007f984cd5f0a6 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #17 0x00007f984d6018be n/a (QtWidgets.so)
                #18 0x00007f984fa31728 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                #19 0x00007f984cd5cc31 _ZN12QApplication5eventEP6QEvent (libQt5Widgets.so.5)
                #20 0x00007f984d601c0c n/a (QtWidgets.so)
                #21 0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #22 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #23 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #24 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #25 0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #26 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #27 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #28 0x00007f984f58e6dd n/a (sip.so)
                #29 0x00007f984f58e919 n/a (sip.so)
                #30 0x00007f984d3c8fcb n/a (QtWidgets.so)
                #31 0x00007f984d601adb n/a (QtWidgets.so)
                #32 0x00007f984cd56d3c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #33 0x00007f984cd5e3d0 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #34 0x00007f984d6018be n/a (QtWidgets.so)
                #35 0x00007f984fa31728 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                #36 0x00007f984fa8be39 _ZN14QTimerInfoList14activateTimersEv (libQt5Core.so.5)
                #37 0x00007f984fa8c6f9 n/a (libQt5Core.so.5)
                #38 0x00007f98507bfdb7 g_main_context_dispatch (libglib-2.0.so.0)
                #39 0x00007f98507c00c8 n/a (libglib-2.0.so.0)
                #40 0x00007f98507c02ac g_main_context_iteration (libglib-2.0.so.0)
                #41 0x00007f984fa8ca8f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
                #42 0x00007f984fa2fbd2 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                #43 0x00007f984fa38c34 _ZN16QCoreApplication4execEv (libQt5Core.so.5)
                #44 0x00007f984d57630b n/a (QtWidgets.so)
                #45 0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #46 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #47 0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #48 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #49 0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #50 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #51 0x00007f9859a50d55 n/a (libpython2.7.so.1.0)
                #52 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #53 0x00007f9859ad3bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #54 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #55 0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #56 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #57 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #58 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #59 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #60 0x00007f9859ff8529 execute_python_entrypoint (libcalibre-launcher.so)
                #61 0x0000000000400635 n/a (calibre-parallel)
                #62 0x00007f9859e0eb6b __libc_start_main (libc.so.6)
                #63 0x0000000000400669 n/a (calibre-parallel)
                
                Stack trace of thread 3539:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c7011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c73e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3534:
                #0  0x00007f98599ba086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f98599ba178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007f9859b14bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007f9859b1a522 n/a (libpython2.7.so.1.0)
                #4  0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007f9859a50d55 n/a (libpython2.7.so.1.0)
                #11 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #12 0x00007f9859ad3bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #13 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #14 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #15 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #16 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #17 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #18 0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #19 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #20 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #21 0x00007f9859b1a922 n/a (libpython2.7.so.1.0)
                #22 0x00007f9859b14907 n/a (libpython2.7.so.1.0)
                #23 0x00007f98599b1182 start_thread (libpthread.so.0)
                #24 0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3533:
                #0  0x00007f98599ba086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f98599ba178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007f9859b14bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007f9859b1a522 n/a (libpython2.7.so.1.0)
                #4  0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007f9859a50d55 n/a (libpython2.7.so.1.0)
                #11 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #12 0x00007f9859ad3bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #13 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #14 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #15 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #16 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #17 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #18 0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #19 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #20 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #21 0x00007f9859b1a922 n/a (libpython2.7.so.1.0)
                #22 0x00007f9859b14907 n/a (libpython2.7.so.1.0)
                #23 0x00007f98599b1182 start_thread (libpthread.so.0)
                #24 0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3535:
                #0  0x00007f98599ba086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f98599ba178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007f9859b14bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007f9859b1a522 n/a (libpython2.7.so.1.0)
                #4  0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #11 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #12 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #13 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #14 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #15 0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #16 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #17 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #18 0x00007f9859b1a922 n/a (libpython2.7.so.1.0)
                #19 0x00007f9859b14907 n/a (libpython2.7.so.1.0)
                #20 0x00007f98599b1182 start_thread (libpthread.so.0)
                #21 0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3540:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c7011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c73e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3553:
                #0  0x00007f98599b73bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650943e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509ee3 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a02f n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f9846478473 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f984649915d n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464d9d59 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3538:
                #0  0x00007f9859f05e3f epoll_wait (libc.so.6)
                #1  0x00007f984681bc54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846819d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650f06a n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984649915d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464d6674 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464d9e58 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3541:
                #0  0x00007f9859ef9729 __GI___poll (libc.so.6)
                #1  0x00007f9845f97a1a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f98464d9be4 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98599b1182 start_thread (libpthread.so.0)
                #5  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3547:
                #0  0x00007f9859f05e3f epoll_wait (libc.so.6)
                #1  0x00007f984681bc54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846819d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650efc1 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984649915d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464d9d59 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f98599b1182 start_thread (libpthread.so.0)
                #8  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3554:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c6c75 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c73e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3551:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c7011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c73e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3549:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c7011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c73e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3546:
                #0  0x00007f9859ec93ba __GI___waitpid (libc.so.6)
                #1  0x00007f98465065d7 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846507616 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f9846507759 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98599b1182 start_thread (libpthread.so.0)
                #6  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3555:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c6c75 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c73e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3556:
                #0  0x00007f98599b7916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650953a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f9846478481 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984649915d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464d9d59 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f98599b1182 start_thread (libpthread.so.0)
                #8  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3572:
                #0  0x00007f9859ef4fb4 __GI___libc_read (libc.so.6)
                #1  0x00007f9851ea3a2e n/a (_multiprocessing.so)
                #2  0x00007f9851ea3c80 n/a (_multiprocessing.so)
                #3  0x00007f9859ad8f1d PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #4  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #5  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #6  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #7  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #8  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #9  0x00007f9859a50d55 n/a (libpython2.7.so.1.0)
                #10 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #11 0x00007f9859ad3bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #12 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #13 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #14 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #15 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #16 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #17 0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #18 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #19 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #20 0x00007f9859b1a922 n/a (libpython2.7.so.1.0)
                #21 0x00007f9859b14907 n/a (libpython2.7.so.1.0)
                #22 0x00007f98599b1182 start_thread (libpthread.so.0)
                #23 0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3558:
                #0  0x00007f98599b73bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650943e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509ee3 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a02f n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2805 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c7011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c7464 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3548:
                #0  0x00007f9859efc047 __GI___select (libc.so.6)
                #1  0x00007f984645eb33 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f98599b1182 start_thread (libpthread.so.0)
                #4  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3560:
                #0  0x00007f98599ba086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007f98599ba178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007f9859b14bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007f9859b1a522 n/a (libpython2.7.so.1.0)
                #4  0x00007f9859ad9a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007f9859ad8404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #11 0x00007f9859ad8525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #12 0x00007f9859adbfbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #13 0x00007f9859a50c6c n/a (libpython2.7.so.1.0)
                #14 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #15 0x00007f9859a3008c n/a (libpython2.7.so.1.0)
                #16 0x00007f9859a1e2b3 PyObject_Call (libpython2.7.so.1.0)
                #17 0x00007f9859ad2087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #18 0x00007f9859b1a922 n/a (libpython2.7.so.1.0)
                #19 0x00007f9859b14907 n/a (libpython2.7.so.1.0)
                #20 0x00007f98599b1182 start_thread (libpthread.so.0)
                #21 0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3576:
                #0  0x00007f98599b73bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650943e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846509ee3 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650a02f n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f98464c2805 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464c7011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464c7424 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3550:
                #0  0x00007f9859f05e3f epoll_wait (libc.so.6)
                #1  0x00007f984681bc54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846819d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650f06a n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984649915d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f9845be8644 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f98464d9e58 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3573:
                #0  0x00007f9859ef9729 __GI___poll (libc.so.6)
                #1  0x00007f98507bffd3 n/a (libglib-2.0.so.0)
                #2  0x00007f98507c02ac g_main_context_iteration (libglib-2.0.so.0)
                #3  0x00007f984fa8ca8f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
                #4  0x00007f984fa2fbd2 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                #5  0x00007f984f847114 _ZN7QThread4execEv (libQt5Core.so.5)
                #6  0x00007f983ce9db05 n/a (libQt5DBus.so.5)
                #7  0x00007f984f84875e n/a (libQt5Core.so.5)
                #8  0x00007f98599b1182 start_thread (libpthread.so.0)
                #9  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3552:
                #0  0x00007f98599b73bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007f984650943e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f984715bfb5 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f98464d9be4 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98599b1182 start_thread (libpthread.so.0)
                #6  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3557:
                #0  0x00007f9859f05e3f epoll_wait (libc.so.6)
                #1  0x00007f984681bc54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007f9846819d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007f984650efc1 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007f984649915d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007f98464d9d59 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007f984650c4f4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007f98599b1182 start_thread (libpthread.so.0)
                #8  0x00007f9859f05b1f __clone (libc.so.6)
                
                Stack trace of thread 3532:
                #0  0x00007f9859ef9729 __GI___poll (libc.so.6)
                #1  0x00007f98550a1917 n/a (libxcb.so.1)
                #2  0x00007f98550a353a xcb_wait_for_event (libxcb.so.1)
                #3  0x00007f983cf82a18 n/a (libQt5XcbQpa.so.5)
                #4  0x00007f984f84875e n/a (libQt5Core.so.5)
                #5  0x00007f98599b1182 start_thread (libpthread.so.0)
                #6  0x00007f9859f05b1f __clone (libc.so.6)

GNU gdb (Ubuntu 8.2.91.20190405-0ubuntu3) 8.2.91.20190405-git
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /opt/calibre/bin/calibre-parallel...
(No debugging symbols found in /opt/calibre/bin/calibre-parallel)

warning: core file may not match specified executable file.
[New LWP 3528]
[New LWP 3539]
[New LWP 3534]
[New LWP 3533]
[New LWP 3535]
[New LWP 3540]
[New LWP 3553]
[New LWP 3538]
[New LWP 3541]
[New LWP 3547]
[New LWP 3554]
[New LWP 3551]
[New LWP 3549]
[New LWP 3546]
[New LWP 3555]
[New LWP 3556]
[New LWP 3572]
[New LWP 3558]
[New LWP 3548]
[New LWP 3560]
[New LWP 3576]
[New LWP 3550]
[New LWP 3573]
[New LWP 3552]
[New LWP 3557]
[New LWP 3532]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/opt/calibre/bin/calibre-parallel'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f984ec1c779 in QTextFormat::stringProperty(int) const () from /opt/calibre/lib/libQt5Gui.so.5
[Current thread is 1 (Thread 0x7f985984a740 (LWP 3528))]
(gdb) #0  0x00007f984ec1c779 in QTextFormat::stringProperty(int) const () from /opt/calibre/lib/libQt5Gui.so.5
#1  0x00007f984f1368b7 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtGui.so
#2  0x00007f9859ad9a35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#3  0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#4  0x00007f9859ad8404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#5  0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#6  0x00007f9859a50c6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#7  0x00007f9859a1e2b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#8  0x00007f9859a3008c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#9  0x00007f9859a1e2b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#10 0x00007f9859ad2087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#11 0x00007f984f58e6dd in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#12 0x00007f984f58e919 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#13 0x00007f984d3c8fcb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#14 0x00007f984d4bcd9b in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#15 0x00007f984cd56d3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#16 0x00007f984cd5f0a6 in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#17 0x00007f984d6018be in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#18 0x00007f984fa31728 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Core.so.5
#19 0x00007f984cd5cc31 in QApplication::event(QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#20 0x00007f984d601c0c in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#21 0x00007f9859ad9a35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#22 0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#23 0x00007f9859a50c6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#24 0x00007f9859a1e2b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#25 0x00007f9859a3008c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#26 0x00007f9859a1e2b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#27 0x00007f9859ad2087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#28 0x00007f984f58e6dd in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#29 0x00007f984f58e919 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#30 0x00007f984d3c8fcb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
--Type <RET> for more, q to quit, c to continue without paging--#31 0x00007f984d601adb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#32 0x00007f984cd56d3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#33 0x00007f984cd5e3d0 in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#34 0x00007f984d6018be in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#35 0x00007f984fa31728 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Core.so.5
#36 0x00007f984fa8be39 in QTimerInfoList::activateTimers() () from /opt/calibre/lib/libQt5Core.so.5
#37 0x00007f984fa8c6f9 in ?? () from /opt/calibre/lib/libQt5Core.so.5
#38 0x00007f98507bfdb7 in g_main_context_dispatch () from /opt/calibre/lib/libglib-2.0.so.0
#39 0x00007f98507c00c8 in ?? () from /opt/calibre/lib/libglib-2.0.so.0
#40 0x00007f98507c02ac in g_main_context_iteration () from /opt/calibre/lib/libglib-2.0.so.0
#41 0x00007f984fa8ca8f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /opt/calibre/lib/libQt5Core.so.5
#42 0x00007f984fa2fbd2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/calibre/lib/libQt5Core.so.5
#43 0x00007f984fa38c34 in QCoreApplication::exec() () from /opt/calibre/lib/libQt5Core.so.5
#44 0x00007f984d57630b in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#45 0x00007f9859ad9a35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#46 0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#47 0x00007f9859ad8404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#48 0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#49 0x00007f9859ad8404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#50 0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#51 0x00007f9859a50d55 in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#52 0x00007f9859a1e2b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#53 0x00007f9859ad3bd2 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#54 0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#55 0x00007f9859ad8404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#56 0x00007f9859adbfbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#57 0x00007f9859a50c6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#58 0x00007f9859a1e2b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#59 0x00007f9859ad2087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#60 0x00007f9859ff8529 in execute_python_entrypoint () from /opt/calibre/lib/libcalibre-launcher.so
--Type <RET> for more, q to quit, c to continue without paging--#61 0x0000000000400635 in ?? ()
#62 0x00007f9859e0eb6b in __libc_start_main (main=0x400600, argc=1, argv=0x7fff55c15a18, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff55c15a08) at ../csu/libc-start.c:308
#63 0x0000000000400669 in ?? ()
(gdb) quit
ps@ps-Inspiron-3650:~$

Last edited by ps67; 10-14-2019 at 02:09 AM. Reason: opened nomally from calibre, not with debug
ps67 is offline   Reply With Quote
Old 10-14-2019, 02:13 AM   #19
ps67
Groupie
ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.ps67 ought to be getting tired of karma fortunes by now.
 
Posts: 195
Karma: 1124364
Join Date: Aug 2017
Location: Italy
Device: Kindle Paperwhite, Kobo Aura One
And now opened file and imediately obtained segfault again:

Code:
ps@ps-Inspiron-3650:~$ CALIBRE_CONFIG_DIRECTORY=/tmp/cc calibre-debug -t
Not controlling automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 100.968944099 x 100.852941176
physicalDpi: 102.453781513 x 102.358208955
Using calibre Qt style: True
['kdialog', '--title', 'Scegli il libro', '--desktopfile', 'calibre-gui', '--attach', '62914578', '--getopenfilename', '/home/ps', 'Libri (*.azw3 *.epub)']
Errore di segmentazione (core dump creato)
and:

Code:
ps@ps-Inspiron-3650:~$ echo bt | coredumpctl gdb                        
           PID: 3677 (open_book)
           UID: 1000 (ps)
           GID: 1000 (ps)
        Signal: 11 (SEGV)
     Timestamp: Mon 2019-10-14 07:10:51 CEST (1min 46s ago)
  Command Line: /opt/calibre/bin/calibre-debug -t
    Executable: /opt/calibre/bin/calibre-debug
 Control Group: /user.slice/user-1000.slice/session-3.scope
          Unit: session-3.scope
         Slice: user-1000.slice
       Session: 3
     Owner UID: 1000 (ps)
       Boot ID: 60897caff5634982a21766c89c364036
    Machine ID: 511f79f717f34fabbda1f4c6b7101b7d
      Hostname: ps-Inspiron-3650
       Storage: /var/lib/systemd/coredump/core.open_book.1000.60897caff5634982a21766c89c364036.3677.1571029851000000.lz4
       Message: Process 3677 (open_book) of user 1000 dumped core.
                
                Stack trace of thread 3677:
                #0  0x00007fb972a76779 _ZNK11QTextFormat14stringPropertyEi (libQt5Gui.so.5)
                #1  0x00007fb972f908b7 n/a (QtGui.so)
                #2  0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #3  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #4  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #7  0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #8  0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #9  0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #10 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #11 0x00007fb9733e86dd n/a (sip.so)
                #12 0x00007fb9733e8919 n/a (sip.so)
                #13 0x00007fb9711f9fcb n/a (QtWidgets.so)
                #14 0x00007fb9712edd9b n/a (QtWidgets.so)
                #15 0x00007fb970b87d3c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #16 0x00007fb970b900a6 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #17 0x00007fb9714328be n/a (QtWidgets.so)
                #18 0x00007fb97388b728 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                #19 0x00007fb970b8dc31 _ZN12QApplication5eventEP6QEvent (libQt5Widgets.so.5)
                #20 0x00007fb971432c0c n/a (QtWidgets.so)
                #21 0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #22 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #23 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #24 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #25 0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #26 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #27 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #28 0x00007fb9733e86dd n/a (sip.so)
                #29 0x00007fb9733e8919 n/a (sip.so)
                #30 0x00007fb9711f9fcb n/a (QtWidgets.so)
                #31 0x00007fb971432adb n/a (QtWidgets.so)
                #32 0x00007fb970b87d3c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #33 0x00007fb970b8f3d0 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
                #34 0x00007fb9714328be n/a (QtWidgets.so)
                #35 0x00007fb97388b728 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                #36 0x00007fb9738e5e39 _ZN14QTimerInfoList14activateTimersEv (libQt5Core.so.5)
                #37 0x00007fb9738e66c1 n/a (libQt5Core.so.5)
                #38 0x00007fb974619db7 g_main_context_dispatch (libglib-2.0.so.0)
                #39 0x00007fb97461a0c8 n/a (libglib-2.0.so.0)
                #40 0x00007fb97461a2ac g_main_context_iteration (libglib-2.0.so.0)
                #41 0x00007fb9738e6a8f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
                #42 0x00007fb973889bd2 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                #43 0x00007fb973892c34 _ZN16QCoreApplication4execEv (libQt5Core.so.5)
                #44 0x00007fb9713a730b n/a (QtWidgets.so)
                #45 0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #46 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #47 0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #48 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #49 0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #50 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #51 0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #52 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #53 0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #54 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #55 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #56 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #57 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #58 0x00007fb97d82b529 execute_python_entrypoint (libcalibre-launcher.so)
                #59 0x0000000000400635 n/a (calibre-debug)
                #60 0x00007fb97d641b6b __libc_start_main (libc.so.6)
                #61 0x0000000000400669 n/a (calibre-debug)
                
                Stack trace of thread 3682:
                #0  0x00007fb97d1ed086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb97d1ed178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007fb97d347bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007fb97d34d522 n/a (libpython2.7.so.1.0)
                #4  0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007fb97d283d55 n/a (libpython2.7.so.1.0)
                #11 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #12 0x00007fb97d306bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #13 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #14 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #15 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #16 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #17 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #18 0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #19 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #20 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #21 0x00007fb97d34d922 n/a (libpython2.7.so.1.0)
                #22 0x00007fb97d347907 n/a (libpython2.7.so.1.0)
                #23 0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #24 0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3681:
                #0  0x00007fb97d72c729 __GI___poll (libc.so.6)
                #1  0x00007fb9722fe917 n/a (libxcb.so.1)
                #2  0x00007fb97230053a xcb_wait_for_event (libxcb.so.1)
                #3  0x00007fb960db3a18 n/a (libQt5XcbQpa.so.5)
                #4  0x00007fb9736a275e n/a (libQt5Core.so.5)
                #5  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #6  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3683:
                #0  0x00007fb97d1ed086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb97d1ed178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007fb97d347bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007fb97d34d522 n/a (libpython2.7.so.1.0)
                #4  0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007fb97d283d55 n/a (libpython2.7.so.1.0)
                #11 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #12 0x00007fb97d306bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #13 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #14 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #15 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #16 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #17 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #18 0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #19 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #20 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #21 0x00007fb97d34d922 n/a (libpython2.7.so.1.0)
                #22 0x00007fb97d347907 n/a (libpython2.7.so.1.0)
                #23 0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #24 0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3688:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3696:
                #0  0x00007fb97d738e3f epoll_wait (libc.so.6)
                #1  0x00007fb969faac54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969fa8d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9dfc1 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c2815d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c68d59 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #8  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3684:
                #0  0x00007fb97d1ed086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb97d1ed178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007fb97d347bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007fb97d34d522 n/a (libpython2.7.so.1.0)
                #4  0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #11 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #12 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #13 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #14 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #15 0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #16 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #17 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #18 0x00007fb97d34d922 n/a (libpython2.7.so.1.0)
                #19 0x00007fb97d347907 n/a (libpython2.7.so.1.0)
                #20 0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #21 0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3689:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3690:
                #0  0x00007fb97d72c729 __GI___poll (libc.so.6)
                #1  0x00007fb969726a1a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c68be4 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #5  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3697:
                #0  0x00007fb97d72f047 __GI___select (libc.so.6)
                #1  0x00007fb969bedb33 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #4  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3687:
                #0  0x00007fb97d738e3f epoll_wait (libc.so.6)
                #1  0x00007fb969faac54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969fa8d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9e06a n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c2815d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c65674 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c68e58 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3699:
                #0  0x00007fb97d738e3f epoll_wait (libc.so.6)
                #1  0x00007fb969faac54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969fa8d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9e06a n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c2815d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969377644 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c68e58 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3695:
                #0  0x00007fb97d6fc3ba __GI___waitpid (libc.so.6)
                #1  0x00007fb969c955d7 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c96616 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c96759 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #6  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3700:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3702:
                #0  0x00007fb97d1ea3bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9843e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98ee3 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9902f n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c07473 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c2815d n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c68d59 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3707:
                #0  0x00007fb97d1ed086 futex_abstimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb97d1ed178 __new_sem_wait_slow (libpthread.so.0)
                #2  0x00007fb97d347bb8 PyThread_acquire_lock (libpython2.7.so.1.0)
                #3  0x00007fb97d34d522 n/a (libpython2.7.so.1.0)
                #4  0x00007fb97d30ca35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #5  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #6  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #7  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #8  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #9  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #10 0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #11 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #12 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #13 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #14 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #15 0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #16 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #17 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #18 0x00007fb97d34d922 n/a (libpython2.7.so.1.0)
                #19 0x00007fb97d347907 n/a (libpython2.7.so.1.0)
                #20 0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #21 0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3698:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3701:
                #0  0x00007fb97d1ea3bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9843e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb96a8eafb5 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c68be4 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #6  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3704:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c07481 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c2815d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c68d59 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #8  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3723:
                #0  0x00007fb97d727fb4 __GI___libc_read (libc.so.6)
                #1  0x00007fb963b0aa2e n/a (_multiprocessing.so)
                #2  0x00007fb963b0ac80 n/a (_multiprocessing.so)
                #3  0x00007fb97d30bf1d PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #4  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #5  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #6  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #7  0x00007fb97d30b404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #8  0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #9  0x00007fb97d283d55 n/a (libpython2.7.so.1.0)
                #10 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #11 0x00007fb97d306bd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #12 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #13 0x00007fb97d30b525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
                #14 0x00007fb97d30efbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
                #15 0x00007fb97d283c6c n/a (libpython2.7.so.1.0)
                #16 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #17 0x00007fb97d26308c n/a (libpython2.7.so.1.0)
                #18 0x00007fb97d2512b3 PyObject_Call (libpython2.7.so.1.0)
                #19 0x00007fb97d305087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
                #20 0x00007fb97d34d922 n/a (libpython2.7.so.1.0)
                #21 0x00007fb97d347907 n/a (libpython2.7.so.1.0)
                #22 0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #23 0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3706:
                #0  0x00007fb97d1ea3bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9843e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98ee3 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9902f n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51805 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c56464 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3703:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3720:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3705:
                #0  0x00007fb97d738e3f epoll_wait (libc.so.6)
                #1  0x00007fb969faac54 n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969fa8d53 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9dfc1 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c2815d n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c68d59 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #8  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3721:
                #0  0x00007fb97d1ea916 futex_reltimed_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9853a n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98fdd n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c99072 n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51831 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c55c75 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c563e4 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3724:
                #0  0x00007fb97d1ea3bb futex_wait_cancelable (libpthread.so.0)
                #1  0x00007fb969c9843e n/a (libQt5WebEngineCore.so.5)
                #2  0x00007fb969c98ee3 n/a (libQt5WebEngineCore.so.5)
                #3  0x00007fb969c9902f n/a (libQt5WebEngineCore.so.5)
                #4  0x00007fb969c51805 n/a (libQt5WebEngineCore.so.5)
                #5  0x00007fb969c56011 n/a (libQt5WebEngineCore.so.5)
                #6  0x00007fb969c56424 n/a (libQt5WebEngineCore.so.5)
                #7  0x00007fb969c9b4f4 n/a (libQt5WebEngineCore.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)
                
                Stack trace of thread 3722:
                #0  0x00007fb97d72c729 __GI___poll (libc.so.6)
                #1  0x00007fb974619fd3 n/a (libglib-2.0.so.0)
                #2  0x00007fb97461a2ac g_main_context_iteration (libglib-2.0.so.0)
                #3  0x00007fb9738e6a8f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
                #4  0x00007fb973889bd2 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                #5  0x00007fb9736a1114 _ZN7QThread4execEv (libQt5Core.so.5)
                #6  0x00007fb960cceb05 n/a (libQt5DBus.so.5)
                #7  0x00007fb9736a275e n/a (libQt5Core.so.5)
                #8  0x00007fb97d1e4182 start_thread (libpthread.so.0)
                #9  0x00007fb97d738b1f __clone (libc.so.6)

GNU gdb (Ubuntu 8.2.91.20190405-0ubuntu3) 8.2.91.20190405-git
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /opt/calibre/bin/calibre-debug...
(No debugging symbols found in /opt/calibre/bin/calibre-debug)

warning: core file may not match specified executable file.
[New LWP 3677]
[New LWP 3682]
[New LWP 3681]
[New LWP 3683]
[New LWP 3688]
[New LWP 3696]
[New LWP 3684]
[New LWP 3689]
[New LWP 3690]
[New LWP 3697]
[New LWP 3687]
[New LWP 3699]
[New LWP 3695]
[New LWP 3700]
[New LWP 3702]
[New LWP 3707]
[New LWP 3698]
[New LWP 3701]
[New LWP 3704]
[New LWP 3723]
[New LWP 3706]
[New LWP 3703]
[New LWP 3720]
[New LWP 3705]
[New LWP 3721]
[New LWP 3724]
[New LWP 3722]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/opt/calibre/bin/calibre-debug -t'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fb972a76779 in QTextFormat::stringProperty(int) const () from /opt/calibre/lib/libQt5Gui.so.5
[Current thread is 1 (Thread 0x7fb97d07d740 (LWP 3677))]
(gdb) #0  0x00007fb972a76779 in QTextFormat::stringProperty(int) const () from /opt/calibre/lib/libQt5Gui.so.5
#1  0x00007fb972f908b7 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtGui.so
#2  0x00007fb97d30ca35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#3  0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#4  0x00007fb97d30b404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#5  0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#6  0x00007fb97d283c6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#7  0x00007fb97d2512b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#8  0x00007fb97d26308c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#9  0x00007fb97d2512b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#10 0x00007fb97d305087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#11 0x00007fb9733e86dd in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#12 0x00007fb9733e8919 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#13 0x00007fb9711f9fcb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#14 0x00007fb9712edd9b in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#15 0x00007fb970b87d3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#16 0x00007fb970b900a6 in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#17 0x00007fb9714328be in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#18 0x00007fb97388b728 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Core.so.5
#19 0x00007fb970b8dc31 in QApplication::event(QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#20 0x00007fb971432c0c in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#21 0x00007fb97d30ca35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#22 0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#23 0x00007fb97d283c6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#24 0x00007fb97d2512b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#25 0x00007fb97d26308c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#26 0x00007fb97d2512b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#27 0x00007fb97d305087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#28 0x00007fb9733e86dd in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#29 0x00007fb9733e8919 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#30 0x00007fb9711f9fcb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
--Type <RET> for more, q to quit, c to continue without paging--#31 0x00007fb971432adb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#32 0x00007fb970b87d3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#33 0x00007fb970b8f3d0 in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#34 0x00007fb9714328be in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#35 0x00007fb97388b728 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Core.so.5
#36 0x00007fb9738e5e39 in QTimerInfoList::activateTimers() () from /opt/calibre/lib/libQt5Core.so.5
#37 0x00007fb9738e66c1 in ?? () from /opt/calibre/lib/libQt5Core.so.5
#38 0x00007fb974619db7 in g_main_context_dispatch () from /opt/calibre/lib/libglib-2.0.so.0
#39 0x00007fb97461a0c8 in ?? () from /opt/calibre/lib/libglib-2.0.so.0
#40 0x00007fb97461a2ac in g_main_context_iteration () from /opt/calibre/lib/libglib-2.0.so.0
#41 0x00007fb9738e6a8f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /opt/calibre/lib/libQt5Core.so.5
#42 0x00007fb973889bd2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/calibre/lib/libQt5Core.so.5
#43 0x00007fb973892c34 in QCoreApplication::exec() () from /opt/calibre/lib/libQt5Core.so.5
#44 0x00007fb9713a730b in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#45 0x00007fb97d30ca35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#46 0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#47 0x00007fb97d30b404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#48 0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#49 0x00007fb97d30b404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#50 0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#51 0x00007fb97d30b404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#52 0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#53 0x00007fb97d30b404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#54 0x00007fb97d30efbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#55 0x00007fb97d283c6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#56 0x00007fb97d2512b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#57 0x00007fb97d305087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#58 0x00007fb97d82b529 in execute_python_entrypoint () from /opt/calibre/lib/libcalibre-launcher.so
#59 0x0000000000400635 in ?? ()
#60 0x00007fb97d641b6b in __libc_start_main (main=0x400600, argc=2, argv=0x7ffdccf138f8, init=<optimized out>, 
--Type <RET> for more, q to quit, c to continue without paging--    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdccf138e8) at ../csu/libc-start.c:308
#61 0x0000000000400669 in ?? ()
(gdb) quit

Last edited by ps67; 10-14-2019 at 02:18 AM.
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Old 10-14-2019, 02:40 AM   #20
kovidgoyal
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Ah ok I can get ti to crash on my linux system with those steps. Interestingly it only crashes with the pre-built Qt version, not when running with system Qt. Since the pre-built Qt is 5.13.0 and system Qt is 5.13.1 it may be something that was fixed in Qt between those releases. Will try bumping up the Qt version in the calibre bundle and hopefully it will fix it.
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Old 10-14-2019, 05:05 AM   #21
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Thank You.
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Old 10-14-2019, 08:57 AM   #22
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https://github.com/kovidgoyal/calibr...141385b16730f3
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