This is the result of the command You indicated after a segfault:
Code:
echo bt | coredumpctl gdb
PID: 3642 (open_book)
UID: 1000 (ps)
GID: 1000 (ps)
Signal: 11 (SEGV)
Timestamp: Sat 2019-10-12 13:23:29 CEST (10s ago)
Command Line: /opt/calibre/bin/calibre-debug -t
Executable: /opt/calibre/bin/calibre-debug
Control Group: /user.slice/user-1000.slice/session-4.scope
Unit: session-4.scope
Slice: user-1000.slice
Session: 4
Owner UID: 1000 (ps)
Boot ID: 6649def83e6449198311f2bae0557538
Machine ID: 511f79f717f34fabbda1f4c6b7101b7d
Hostname: ps-Inspiron-3650
Storage: /var/lib/systemd/coredump/core.open_book.1000.6649def83e6449198311f2bae0557538.3642.1570879409000000.lz4
Message: Process 3642 (open_book) of user 1000 dumped core.
Stack trace of thread 3642:
#0 0x00007fba0cf0c779 _ZNK11QTextFormat14stringPropertyEi (libQt5Gui.so.5)
#1 0x00007fba0d4268b7 n/a (QtGui.so)
#2 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#3 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#4 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#5 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#6 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#7 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#8 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#9 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#10 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#11 0x00007fba0d87e6dd n/a (sip.so)
#12 0x00007fba0d87e919 n/a (sip.so)
#13 0x00007fba0b678fcb n/a (QtWidgets.so)
#14 0x00007fba0b76cd9b n/a (QtWidgets.so)
#15 0x00007fba0b006d3c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
#16 0x00007fba0b00f0a6 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
#17 0x00007fba0b8b18be n/a (QtWidgets.so)
#18 0x00007fba0dd21728 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
#19 0x00007fba0b00cc31 _ZN12QApplication5eventEP6QEvent (libQt5Widgets.so.5)
#20 0x00007fba0b8b1c0c n/a (QtWidgets.so)
#21 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#22 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#23 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#24 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#25 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#26 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#27 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#28 0x00007fba0d87e6dd n/a (sip.so)
#29 0x00007fba0d87e919 n/a (sip.so)
#30 0x00007fba0b678fcb n/a (QtWidgets.so)
#31 0x00007fba0b8b1adb n/a (QtWidgets.so)
#32 0x00007fba0b006d3c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5)
#33 0x00007fba0b00e3d0 _ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5)
#34 0x00007fba0b8b18be n/a (QtWidgets.so)
#35 0x00007fba0dd21728 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
#36 0x00007fba0dd7be39 _ZN14QTimerInfoList14activateTimersEv (libQt5Core.so.5)
#37 0x00007fba0dd7c6c1 n/a (libQt5Core.so.5)
#38 0x00007fba0ea6fdb7 g_main_context_dispatch (libglib-2.0.so.0)
#39 0x00007fba0ea700c8 n/a (libglib-2.0.so.0)
#40 0x00007fba0ea702ac g_main_context_iteration (libglib-2.0.so.0)
#41 0x00007fba0dd7ca8f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#42 0x00007fba0dd1fbd2 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#43 0x00007fba0dd28c34 _ZN16QCoreApplication4execEv (libQt5Core.so.5)
#44 0x00007fba0b82630b n/a (QtWidgets.so)
#45 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#46 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#47 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#48 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#49 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#50 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#51 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#52 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#53 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#54 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#55 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#56 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#57 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#58 0x00007fba175a2529 execute_python_entrypoint (libcalibre-launcher.so)
#59 0x0000000000400635 n/a (calibre-debug)
#60 0x00007fba173b8b6b __libc_start_main (libc.so.6)
#61 0x0000000000400669 n/a (calibre-debug)
Stack trace of thread 3647:
#0 0x00007fba16f64086 futex_abstimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba16f64178 __new_sem_wait_slow (libpthread.so.0)
#2 0x00007fba170bebb8 PyThread_acquire_lock (libpython2.7.so.1.0)
#3 0x00007fba170c4522 n/a (libpython2.7.so.1.0)
#4 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#5 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#6 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#7 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#8 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#9 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#10 0x00007fba16ffad55 n/a (libpython2.7.so.1.0)
#11 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#12 0x00007fba1707dbd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#13 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#14 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#15 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#16 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#17 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#18 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#19 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#20 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#21 0x00007fba170c4922 n/a (libpython2.7.so.1.0)
#22 0x00007fba170be907 n/a (libpython2.7.so.1.0)
#23 0x00007fba16f5b182 start_thread (libpthread.so.0)
#24 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3649:
#0 0x00007fba16f64086 futex_abstimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba16f64178 __new_sem_wait_slow (libpthread.so.0)
#2 0x00007fba170bebb8 PyThread_acquire_lock (libpython2.7.so.1.0)
#3 0x00007fba170c4522 n/a (libpython2.7.so.1.0)
#4 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#5 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#6 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#7 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#8 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#9 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#10 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#11 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#12 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#13 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#14 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#15 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#16 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#17 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#18 0x00007fba170c4922 n/a (libpython2.7.so.1.0)
#19 0x00007fba170be907 n/a (libpython2.7.so.1.0)
#20 0x00007fba16f5b182 start_thread (libpthread.so.0)
#21 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3648:
#0 0x00007fba16f64086 futex_abstimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba16f64178 __new_sem_wait_slow (libpthread.so.0)
#2 0x00007fba170bebb8 PyThread_acquire_lock (libpython2.7.so.1.0)
#3 0x00007fba170c4522 n/a (libpython2.7.so.1.0)
#4 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#5 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#6 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#7 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#8 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#9 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#10 0x00007fba16ffad55 n/a (libpython2.7.so.1.0)
#11 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#12 0x00007fba1707dbd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#13 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#14 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#15 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#16 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#17 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#18 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#19 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#20 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#21 0x00007fba170c4922 n/a (libpython2.7.so.1.0)
#22 0x00007fba170be907 n/a (libpython2.7.so.1.0)
#23 0x00007fba16f5b182 start_thread (libpthread.so.0)
#24 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3663:
#0 0x00007fba174a6047 __GI___select (libc.so.6)
#1 0x00007fba03e25b33 n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba16f5b182 start_thread (libpthread.so.0)
#4 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3653:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed1072 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89831 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8e011 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e3e4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3652:
#0 0x00007fba174afe3f epoll_wait (libc.so.6)
#1 0x00007fba041e2c54 n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba041e0d53 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed606a n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e6015d n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e9d674 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03ea0e58 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3654:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed1072 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89831 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8e011 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e3e4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3667:
#0 0x00007fba16f613bb futex_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed043e n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0ee3 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed102f n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e3f473 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e6015d n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03ea0d59 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3664:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed1072 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89831 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8e011 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e3e4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3674:
#0 0x00007fba16f64086 futex_abstimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba16f64178 __new_sem_wait_slow (libpthread.so.0)
#2 0x00007fba170bebb8 PyThread_acquire_lock (libpython2.7.so.1.0)
#3 0x00007fba170c4522 n/a (libpython2.7.so.1.0)
#4 0x00007fba17083a35 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#5 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#6 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#7 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#8 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#9 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#10 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#11 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#12 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#13 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#14 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#15 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#16 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#17 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#18 0x00007fba170c4922 n/a (libpython2.7.so.1.0)
#19 0x00007fba170be907 n/a (libpython2.7.so.1.0)
#20 0x00007fba16f5b182 start_thread (libpthread.so.0)
#21 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3655:
#0 0x00007fba174a3729 __GI___poll (libc.so.6)
#1 0x00007fba0395ea1a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ea0be4 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba16f5b182 start_thread (libpthread.so.0)
#5 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3660:
#0 0x00007fba174733ba __GI___waitpid (libc.so.6)
#1 0x00007fba03ecd5d7 n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ece616 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ece759 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba16f5b182 start_thread (libpthread.so.0)
#6 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3671:
#0 0x00007fba1749efb4 __GI___libc_read (libc.so.6)
#1 0x00007fb9fd993a2e n/a (_multiprocessing.so)
#2 0x00007fb9fd993c80 n/a (_multiprocessing.so)
#3 0x00007fba17082f1d PyEval_EvalFrameEx (libpython2.7.so.1.0)
#4 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#5 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#6 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#7 0x00007fba17082404 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#8 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#9 0x00007fba16ffad55 n/a (libpython2.7.so.1.0)
#10 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#11 0x00007fba1707dbd2 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#12 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#13 0x00007fba17082525 PyEval_EvalFrameEx (libpython2.7.so.1.0)
#14 0x00007fba17085fbc PyEval_EvalCodeEx (libpython2.7.so.1.0)
#15 0x00007fba16ffac6c n/a (libpython2.7.so.1.0)
#16 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#17 0x00007fba16fda08c n/a (libpython2.7.so.1.0)
#18 0x00007fba16fc82b3 PyObject_Call (libpython2.7.so.1.0)
#19 0x00007fba1707c087 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0)
#20 0x00007fba170c4922 n/a (libpython2.7.so.1.0)
#21 0x00007fba170be907 n/a (libpython2.7.so.1.0)
#22 0x00007fba16f5b182 start_thread (libpthread.so.0)
#23 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3708:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed1072 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89831 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8dc75 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e3e4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3665:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed1072 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89831 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8e011 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e3e4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3661:
#0 0x00007fba174afe3f epoll_wait (libc.so.6)
#1 0x00007fba041e2c54 n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba041e0d53 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed5fc1 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e6015d n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03ea0d59 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba16f5b182 start_thread (libpthread.so.0)
#8 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3672:
#0 0x00007fba16f613bb futex_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed043e n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0ee3 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed102f n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89805 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8e011 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e464 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3668:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed1072 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89831 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8dc75 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e3e4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3666:
#0 0x00007fba16f613bb futex_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed043e n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba04b22fb5 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ea0be4 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba16f5b182 start_thread (libpthread.so.0)
#6 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3670:
#0 0x00007fba174afe3f epoll_wait (libc.so.6)
#1 0x00007fba041e2c54 n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba041e0d53 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed5fc1 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e6015d n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03ea0d59 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba16f5b182 start_thread (libpthread.so.0)
#8 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3669:
#0 0x00007fba16f61916 futex_reltimed_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed053a n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0fdd n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03e3f481 n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e6015d n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03ea0d59 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba16f5b182 start_thread (libpthread.so.0)
#8 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3646:
#0 0x00007fba174a3729 __GI___poll (libc.so.6)
#1 0x00007fba1264b917 n/a (libxcb.so.1)
#2 0x00007fba1264d53a xcb_wait_for_event (libxcb.so.1)
#3 0x00007fb9fa529a18 n/a (libQt5XcbQpa.so.5)
#4 0x00007fba0db3875e n/a (libQt5Core.so.5)
#5 0x00007fba16f5b182 start_thread (libpthread.so.0)
#6 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3682:
#0 0x00007fba174a3729 __GI___poll (libc.so.6)
#1 0x00007fba0ea6ffd3 n/a (libglib-2.0.so.0)
#2 0x00007fba0ea702ac g_main_context_iteration (libglib-2.0.so.0)
#3 0x00007fba0dd7ca8f _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5)
#4 0x00007fba0dd1fbd2 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
#5 0x00007fba0db37114 _ZN7QThread4execEv (libQt5Core.so.5)
#6 0x00007fb9fa444b05 n/a (libQt5DBus.so.5)
#7 0x00007fba0db3875e n/a (libQt5Core.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3687:
#0 0x00007fba16f613bb futex_wait_cancelable (libpthread.so.0)
#1 0x00007fba03ed043e n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba03ed0ee3 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed102f n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e89805 n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba03e8e011 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03e8e424 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __clone (libc.so.6)
Stack trace of thread 3662:
#0 0x00007fba174afe3f epoll_wait (libc.so.6)
#1 0x00007fba041e2c54 n/a (libQt5WebEngineCore.so.5)
#2 0x00007fba041e0d53 n/a (libQt5WebEngineCore.so.5)
#3 0x00007fba03ed606a n/a (libQt5WebEngineCore.so.5)
#4 0x00007fba03e6015d n/a (libQt5WebEngineCore.so.5)
#5 0x00007fba035af644 n/a (libQt5WebEngineCore.so.5)
#6 0x00007fba03ea0e58 n/a (libQt5WebEngineCore.so.5)
#7 0x00007fba03ed34f4 n/a (libQt5WebEngineCore.so.5)
#8 0x00007fba16f5b182 start_thread (libpthread.so.0)
#9 0x00007fba174afb1f __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 3642]
[New LWP 3647]
[New LWP 3649]
[New LWP 3648]
[New LWP 3663]
[New LWP 3653]
[New LWP 3652]
[New LWP 3654]
[New LWP 3667]
[New LWP 3664]
[New LWP 3674]
[New LWP 3655]
[New LWP 3660]
[New LWP 3671]
[New LWP 3708]
[New LWP 3665]
[New LWP 3661]
[New LWP 3672]
[New LWP 3668]
[New LWP 3666]
[New LWP 3670]
[New LWP 3669]
[New LWP 3646]
[New LWP 3682]
[New LWP 3687]
[New LWP 3662]
[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 0x00007fba0cf0c779 in QTextFormat::stringProperty(int) const () from /opt/calibre/lib/libQt5Gui.so.5
[Current thread is 1 (Thread 0x7fba16df4740 (LWP 3642))]
(gdb) #0 0x00007fba0cf0c779 in QTextFormat::stringProperty(int) const () from /opt/calibre/lib/libQt5Gui.so.5
#1 0x00007fba0d4268b7 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtGui.so
#2 0x00007fba17083a35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#3 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#4 0x00007fba17082404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#5 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#6 0x00007fba16ffac6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#7 0x00007fba16fc82b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#8 0x00007fba16fda08c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#9 0x00007fba16fc82b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#10 0x00007fba1707c087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#11 0x00007fba0d87e6dd in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#12 0x00007fba0d87e919 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#13 0x00007fba0b678fcb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#14 0x00007fba0b76cd9b in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#15 0x00007fba0b006d3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#16 0x00007fba0b00f0a6 in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#17 0x00007fba0b8b18be in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#18 0x00007fba0dd21728 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Core.so.5
#19 0x00007fba0b00cc31 in QApplication::event(QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#20 0x00007fba0b8b1c0c in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#21 0x00007fba17083a35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#22 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#23 0x00007fba16ffac6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#24 0x00007fba16fc82b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#25 0x00007fba16fda08c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#26 0x00007fba16fc82b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#27 0x00007fba1707c087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#28 0x00007fba0d87e6dd in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#29 0x00007fba0d87e919 in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/sip.so
#30 0x00007fba0b678fcb 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 0x00007fba0b8b1adb in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#32 0x00007fba0b006d3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#33 0x00007fba0b00e3d0 in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Widgets.so.5
#34 0x00007fba0b8b18be in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#35 0x00007fba0dd21728 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /opt/calibre/lib/libQt5Core.so.5
#36 0x00007fba0dd7be39 in QTimerInfoList::activateTimers() () from /opt/calibre/lib/libQt5Core.so.5
#37 0x00007fba0dd7c6c1 in ?? () from /opt/calibre/lib/libQt5Core.so.5
#38 0x00007fba0ea6fdb7 in g_main_context_dispatch () from /opt/calibre/lib/libglib-2.0.so.0
#39 0x00007fba0ea700c8 in ?? () from /opt/calibre/lib/libglib-2.0.so.0
#40 0x00007fba0ea702ac in g_main_context_iteration () from /opt/calibre/lib/libglib-2.0.so.0
#41 0x00007fba0dd7ca8f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /opt/calibre/lib/libQt5Core.so.5
#42 0x00007fba0dd1fbd2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /opt/calibre/lib/libQt5Core.so.5
#43 0x00007fba0dd28c34 in QCoreApplication::exec() () from /opt/calibre/lib/libQt5Core.so.5
#44 0x00007fba0b82630b in ?? () from /opt/calibre/lib/python2.7/site-packages/PyQt5/QtWidgets.so
#45 0x00007fba17083a35 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#46 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#47 0x00007fba17082404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#48 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#49 0x00007fba17082404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#50 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#51 0x00007fba17082404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#52 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#53 0x00007fba17082404 in PyEval_EvalFrameEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#54 0x00007fba17085fbc in PyEval_EvalCodeEx () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#55 0x00007fba16ffac6c in ?? () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#56 0x00007fba16fc82b3 in PyObject_Call () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#57 0x00007fba1707c087 in PyEval_CallObjectWithKeywords () from /opt/calibre/lib/../lib/libpython2.7.so.1.0
#58 0x00007fba175a2529 in execute_python_entrypoint () from /opt/calibre/lib/libcalibre-launcher.so
#59 0x0000000000400635 in ?? ()
#60 0x00007fba173b8b6b in __libc_start_main (main=0x400600, argc=2, argv=0x7ffff570e5b8, init=<optimized out>,
--Type <RET> for more, q to quit, c to continue without paging-- fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff570e5a8) at ../csu/libc-start.c:308
#61 0x0000000000400669 in ?? ()
(gdb) quit