Application: cantor (0.2)
KDE Platform Version: 4.5.1 (KDE 4.5.1)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-25-generic x86_64
Distribution: Ubuntu 10.10

-- Information about the crash:
- What I was doing when the application crashed:
Cantor crashes every second time when computing Eigenvectors in Sage.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Cantor (cantor), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f8c2e1f6760 (LWP 14036))]

Thread 2 (Thread 0x7f8c22f86700 (LWP 14037)):
#0  0x00007f8c2b026203 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f8c26a2f009 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f8c26a2f7b5 in g_main_loop_run () from /lib/libglib-2.0.so.0
#3  0x00007f8c236bd0f4 in ?? () from /usr/lib/libgio-2.0.so.0
#4  0x00007f8c26a547e4 in ?? () from /lib/libglib-2.0.so.0
#5  0x00007f8c28b2c971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#6  0x00007f8c2b03292d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8c2e1f6760 (LWP 14036)):
[KCrash Handler]
#6  operator!= (this=0x1147ab8, str=...) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:75
#7  QString::append (this=0x1147ab8, str=...) at tools/qstring.cpp:1499
#8  0x00007f8c1105f64c in operator+= (this=0x1147aa0, text=<value optimized out>) at /usr/include/qt4/QtCore/qstring.h:281
#9  SageExpression::parseOutput (this=0x1147aa0, text=<value optimized out>) at ../../../../../cantor/src/backends/sage/sageexpression.cpp:126
#10 0x00007f8c1105d559 in SageSession::readStdOut (this=0x10f8110) at ../../../../../cantor/src/backends/sage/sagesession.cpp:158
#11 0x00007f8c1105d954 in SageSession::qt_metacall (this=0x10f8110, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7ffffdd80980) at ./sagesession.moc:85
#12 0x00007f8c2b755b27 in QMetaObject::activate (sender=0xf2b1d0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x12e9310) at kernel/qobject.cpp:3280
#13 0x00007f8c10e25e53 in KPtyDevicePrivate::_k_canRead (this=0xf412b0) at ../../kpty/kptydevice.cpp:319
#14 0x00007f8c10e270a1 in KPtyDevice::qt_metacall (this=0xf2b1d0, _c=QMetaObject::InvokeMetaMethod, _id=23353, _a=0x7ffffdd80b60) at ./kptydevice.moc:82
#15 0x00007f8c2b755b27 in QMetaObject::activate (sender=0x1130ad0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x12e9310) at kernel/qobject.cpp:3280
#16 0x00007f8c2b7a1b1e in QSocketNotifier::activated (this=0x1147ab8, _t1=24) at .moc/release-shared/moc_qsocketnotifier.cpp:89
#17 0x00007f8c2b75a653 in QSocketNotifier::event (this=0x1130ad0, e=0x7ffffdd81210) at kernel/qsocketnotifier.cpp:317
#18 0x00007f8c2c0f3fdc in QApplicationPrivate::notify_helper (this=0xd35b10, receiver=0x1130ad0, e=0x7ffffdd81210) at kernel/qapplication.cpp:4396
#19 0x00007f8c2c0f9aed in QApplication::notify (this=0x7ffffdd81520, receiver=0x1130ad0, e=0x7ffffdd81210) at kernel/qapplication.cpp:4277
#20 0x00007f8c2dbfb156 in KApplication::notify (this=0x7ffffdd81520, receiver=0x1130ad0, event=0x7ffffdd81210) at ../../kdeui/kernel/kapplication.cpp:310
#21 0x00007f8c2b73dcdc in QCoreApplication::notifyInternal (this=0x7ffffdd81520, receiver=0x1130ad0, event=0x7ffffdd81210) at kernel/qcoreapplication.cpp:732
#22 0x00007f8c2b76a54a in sendEvent (source=0xd397e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#23 socketNotifierSourceDispatch (source=0xd397e0) at kernel/qeventdispatcher_glib.cpp:110
#24 0x00007f8c26a2b342 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x00007f8c26a2f2a8 in ?? () from /lib/libglib-2.0.so.0
#26 0x00007f8c26a2f45c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x00007f8c2b76a193 in QEventDispatcherGlib::processEvents (this=0xd1de60, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#28 0x00007f8c2c1a6a4e in QGuiEventDispatcherGlib::processEvents (this=0x1147ab8, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00007f8c2b73ca02 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#30 0x00007f8c2b73cdec in QEventLoop::exec (this=0x7ffffdd81470, flags=) at kernel/qeventloop.cpp:201
#31 0x00007f8c2b740ebb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#32 0x0000000000409c0d in main (argc=<value optimized out>, argv=<value optimized out>) at ../../../cantor/src/main.cpp:86

This bug may be a duplicate of or related to bug 266040.

Possible duplicates by query: bug 266040.

Reported using DrKonqi