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Old 08-12-2010, 06:30 PM   #1
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Segmentation Fault when adding books to Calibre 0.7.13
I just updated Calibre to 0.7.13, and now I'm getting a seg-fault when trying to add books. The group of books I was trying to add was a mix of epub and mobi from a couple different sources.

I have placed a core dump at http://mcnewfamily.net/core if that helps.
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Old 08-12-2010, 06:49 PM   #2
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Had a few seg faults while doing other things. I'm on ubuntu. I don't remember what I was upgrading from, but I know it was at least 0.7.1. Have any dependencies changed or anything like that?
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Old 08-12-2010, 06:54 PM   #3
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No, no dependencies have changed. 0.7.13 did switch from using ctypes to a proper C extension for interfacing with ImageMagick, but I doubt that would cause segfaults.

If you launch calibre from a terminal is there any output before the segfault?
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Old 08-12-2010, 06:58 PM   #4
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kovid:


erin@isis:~/Downloads$ calibre
Segmentation fault (core dumped)
erin@isis:~/Downloads$ calibre -v
Segmentation fault (core dumped)

That's all I'm getting, even if I run in verbose mode.
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Old 08-12-2010, 07:03 PM   #5
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kovid: I can send you the output of strace if you'd like, but I don't see anything that looks useful in it. I stink at working with core dumps, so I didn't even try that end.

I haven't worked with python. Is there a good way I can tell it to give me more information about where it's dying?
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Old 08-12-2010, 07:41 PM   #6
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If you can generate a backtrace from the code dump that would be useful. A segafault always happens in C code, not python, so python debugging techniques are rarely useful.
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Old 08-12-2010, 10:26 PM   #7
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Okay, here's the backtrace. Hopefully this'll be useful in some way...


(gdb) bt
#0 0x0000000000000001 in ?? ()
#1 0x00007f0b06e933a3 in QObject::disconnect(QObject const*, char const*, QObject const*, char const*) ()
from /opt/calibre/libQtCore.so.4
#2 0x00007f0b05fd4031 in ?? () from /opt/calibre/libQtGui.so.4
#3 0x00007f0b05fd5263 in QToolButton::mousePressEvent(QMouseEvent*) () from /opt/calibre/libQtGui.so.4
#4 0x00007f0b05ba8709 in QWidget::event(QEvent*) () from /opt/calibre/libQtGui.so.4
#5 0x00007f0b05b523ec in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
from /opt/calibre/libQtGui.so.4
#6 0x00007f0b05b591ab in QApplication::notify(QObject*, QEvent*) () from /opt/calibre/libQtGui.so.4
#7 0x00007f0b02697de6 in ?? () from /opt/calibre/PyQt4.QtGui.so
#8 0x00007f0b06e7ce7c in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
from /opt/calibre/libQtCore.so.4
#9 0x00007f0b05b58386 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /opt/calibre/libQtGui.so.4
#10 0x00007f0b05bd807b in ?? () from /opt/calibre/libQtGui.so.4
#11 0x00007f0b05bd6d8a in QApplication::x11ProcessEvent(_XEvent*) () from /opt/calibre/libQtGui.so.4
#12 0x00007f0b05c00cc2 in ?? () from /opt/calibre/libQtGui.so.4
#13 0x00007f0b066678c2 in g_main_dispatch (context=0x3f8ee00) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:1960
#14 IA__g_main_context_dispatch (context=0x3f8ee00) at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2513
#15 0x00007f0b0666b748 in g_main_context_iterate (context=0x3f8ee00, block=<value optimized out>,
dispatch=<value optimized out>, self=<value optimized out>)
at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2591
#16 0x00007f0b0666b8fc in IA__g_main_context_iteration (context=0x3f8ee00, may_block=1)
at /build/buildd/glib2.0-2.24.1/glib/gmain.c:2654
#17 0x00007f0b06ea6423 in QEventDispatcherGlib:rocessEvents(QFlags<QEventL oop::ProcessEventsFlag>) ()
from /opt/calibre/libQtCore.so.4
#18 0x00007f0b05c008be in ?? () from /opt/calibre/libQtGui.so.4
#19 0x00007f0b06e7b7a2 in QEventLoop:rocessEvents(QFlags<QEventLoop::Proce ssEventsFlag>) ()
from /opt/calibre/libQtCore.so.4
#20 0x00007f0b06e7bb7c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsF lag>) ()
from /opt/calibre/libQtCore.so.4
#21 0x00007f0b06e8080b in QCoreApplication::exec() () from /opt/calibre/libQtCore.so.4
#22 0x00007f0b02698b4b in ?? () from /opt/calibre/PyQt4.QtGui.so
#23 0x00007f0b0b1166b7 in PyEval_EvalFrameEx () from /opt/calibre/libpython2.6.so.1.0
#24 0x00007f0b0b11700b in PyEval_EvalFrameEx () from /opt/calibre/libpython2.6.so.1.0
#25 0x00007f0b0b1184e5 in PyEval_EvalCodeEx () from /opt/calibre/libpython2.6.so.1.0
#26 0x00007f0b0b1167db in PyEval_EvalFrameEx () from /opt/calibre/libpython2.6.so.1.0
#27 0x00007f0b0b1184e5 in PyEval_EvalCodeEx () from /opt/calibre/libpython2.6.so.1.0
#28 0x00007f0b0b1185b2 in PyEval_EvalCode () from /opt/calibre/libpython2.6.so.1.0
#29 0x0000000000401c56 in _start ()
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Old 08-12-2010, 10:28 PM   #8
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this appears to have happened while handling a mouse click. Do you remember what you clicked?
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Old 08-12-2010, 10:49 PM   #9
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Yup. I was clicking on the "open" after selecting a book to add to calibre. (in the add books from a single directory box)

Interestingly, it looks like it's working this time, and I don't know why. I just added a book without a seg fault...
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Old 08-12-2010, 11:16 PM   #10
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Hmm, that box is not part of the calibre code, (it's the standard platform dependent file open dialog).
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Old 08-12-2010, 11:47 PM   #11
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Yeah. Not sure what happened. It's all working fine now. I have no idea what was wrong earlier. Must've been my computer acting up. Sorry to waste your time.
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