Application: cantor (0.3)
KDE Platform Version: 4.8.5 (4.8.5)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-31-generic x86_64
Distribution: Ubuntu 12.04.1 LTS

-- Information about the crash:
I had Cantor running with the Maxima backend.  After starting a computation that never finished, I clicked Cancel, and Cantor crashed.

-- Backtrace:
Application: Cantor (cantor), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f14038af780 (LWP 30031))]

Thread 2 (Thread 0x7f13f0642700 (LWP 30033)):
#0  0x00007f13fd6b4ea0 in __pthread_mutex_lock (mutex=0x7f13e8000a60) at pthread_mutex_lock.c:56
#1  0x00007f13fd2215a1 in g_mutex_lock (mutex=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gthread-posix.c:208
#2  0x00007f13fd1e5337 in g_main_context_release (context=0x7f13e80009a0) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:2658
#3  0x00007f13fd1e5fe9 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7f13e80009a0, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3148
#4  g_main_context_iterate (context=0x7f13e80009a0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3083
#5  0x00007f13fd1e6164 in g_main_context_iteration (context=0x7f13e80009a0, may_block=1) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3207
#6  0x00007f1400ddb426 in QEventDispatcherGlib::processEvents (this=0x7f13e80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#7  0x00007f1400daac82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007f1400daaed7 in QEventLoop::exec (this=0x7f13f0641dd0, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007f1400ca9fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#10 0x00007f1400d8a9ff in QInotifyFileSystemWatcherEngine::run (this=0x15d06c0) at io/qfilesystemwatcher_inotify.cpp:248
#11 0x00007f1400cacfcb in QThreadPrivate::start (arg=0x15d06c0) at thread/qthread_unix.cpp:298
#12 0x00007f13fd6b2e9a in start_thread (arg=0x7f13f0642700) at pthread_create.c:308
#13 0x00007f1400665dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f14038af780 (LWP 30031)):
[KCrash Handler]
#6  0x00007f13f1c7b812 in MaximaSession::interrupt (this=0x15e7d60) at ../../../../src/backends/maxima/maximasession.cpp:477
#7  0x00007f13efc1930e in Worksheet::interrupt (this=0x1a26d50) at ../../src/worksheet.cpp:586
#8  0x00007f13efc11425 in CantorPart::evaluateOrInterrupt (this=0x1a899d0) at ../../src/cantor_part.cpp:367
#9  0x00007f1400dc0281 in QMetaObject::activate (sender=0x1a2b7c0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7ffff5721c80) at kernel/qobject.cpp:3547
#10 0x00007f140179f132 in QAction::triggered (this=<optimized out>, _t1=false) at .moc/release-shared/moc_qaction.cpp:277
#11 0x00007f140179f31f in QAction::activate (this=0x1a2b7c0, event=<optimized out>) at kernel/qaction.cpp:1257
#12 0x00007f1401b74d4a in QAbstractButtonPrivate::click (this=0x1acddb0) at widgets/qabstractbutton.cpp:530
#13 0x00007f1401b74ffc in QAbstractButton::mouseReleaseEvent (this=0x1ac5570, e=0x7ffff5722560) at widgets/qabstractbutton.cpp:1123
#14 0x00007f1401c325da in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:718
#15 0x00007f14017f6144 in QWidget::event (this=0x1ac5570, event=0x7ffff5722560) at kernel/qwidget.cpp:8362
#16 0x00007f14017a5894 in notify_helper (e=0x7ffff5722560, receiver=0x1ac5570, this=0x157f310) at kernel/qapplication.cpp:4559
#17 QApplicationPrivate::notify_helper (this=0x157f310, receiver=0x1ac5570, e=0x7ffff5722560) at kernel/qapplication.cpp:4531
#18 0x00007f14017ab0bf in QApplication::notify (this=<optimized out>, receiver=0x1ac5570, e=0x7ffff5722560) at kernel/qapplication.cpp:4102
#19 0x00007f140329b3f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#20 0x00007f1400dabe9c in QCoreApplication::notifyInternal (this=0x7ffff5723240, receiver=0x1ac5570, event=0x7ffff5722560) at kernel/qcoreapplication.cpp:876
#21 0x00007f14017a6862 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#22 QApplicationPrivate::sendMouseEvent (receiver=0x1ac5570, event=0x7ffff5722560, alienWidget=0x1ac5570, nativeWidget=0x171ea60, buttonDown=0x1ac5570, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3170
#23 0x00007f1401825bf5 in QETWidget::translateMouseEvent (this=0x171ea60, event=<optimized out>) at kernel/qapplication_x11.cpp:4617
#24 0x00007f1401824bae in QApplication::x11ProcessEvent (this=0x7ffff5723240, event=0x7ffff5722e30) at kernel/qapplication_x11.cpp:3732
#25 0x00007f140184e0d2 in x11EventSourceDispatch (s=0x1582270, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#26 0x00007f13fd1e5d53 in g_main_dispatch (context=0x1582030) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:2539
#27 g_main_context_dispatch (context=0x1582030) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3075
#28 0x00007f13fd1e60a0 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x1582030, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3146
#29 g_main_context_iterate (context=0x1582030, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3083
#30 0x00007f13fd1e6164 in g_main_context_iteration (context=0x1582030, may_block=1) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3207
#31 0x00007f1400ddb3bf in QEventDispatcherGlib::processEvents (this=0x1556b30, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#32 0x00007f140184dd5e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#33 0x00007f1400daac82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#34 0x00007f1400daaed7 in QEventLoop::exec (this=0x7ffff57231d0, flags=...) at kernel/qeventloop.cpp:204
#35 0x00007f1400daff67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#36 0x000000000040a28f in main (argc=5, argv=0x7ffff5723618) at ../../src/main.cpp:88

Reported using DrKonqi