Application: kwin (4.7.4 (4.7.4))
KDE Platform Version: 4.7.4 (4.7.4)
Qt Version: 4.8.1
Operating System: Linux 3.3.5 x86_64
Distribution: Debian GNU/Linux testing (wheezy)

-- Information about the crash:
- What I was doing when the application crashed:
I switched stack of four windows. When I realeased keys, kwin crashed, but system continued to work correctly.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fcde1d11780 (LWP 4335))]

Thread 2 (Thread 0x7fcdb6964700 (LWP 4340)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fcde0376a72 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007fcde0376aa9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007fcdd750eb50 in start_thread (arg=<optimized out>) at pthread_create.c:304
#4  0x00007fcde15679dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fcde1d11780 (LWP 4335)):
[KCrash Handler]
#6  0x00007fcde18fd54a in KWin::EffectsHandlerImpl::currentTabBoxWindowList (this=<optimized out>) at ../../kwin/effects.cpp:767
#7  0x00007fcdbc42db46 in KWin::FlipSwitchEffect::paintScreen (this=0x2001670, region=..., data=..., mask=<optimized out>) at ../../../kwin/effects/flipswitch/flipswitch.cpp:153
#8  0x00007fcdbc42fe92 in KWin::FlipSwitchEffect::paintScreen (this=0x2001670, mask=544, region=..., data=...) at ../../../kwin/effects/flipswitch/flipswitch.cpp:150
#9  0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#10 0x00007fcdbc3e6048 in KWin::DesktopGridEffect::paintScreen (this=0x1f9e230, mask=544, region=..., data=...) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:161
#11 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#12 0x00007fcdbc3fe277 in KWin::SlideEffect::paintScreen (this=<optimized out>, mask=544, region=..., data=...) at ../../../kwin/effects/slide/slide.cpp:81
#13 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#14 0x00007fcdbc3e0049 in KWin::BoxSwitchEffect::paintScreen (this=0x1dc0bb0, mask=544, region=..., data=...) at ../../../kwin/effects/boxswitch/boxswitch.cpp:137
#15 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#16 0x00007fcddf968598 in KWin::Effect::paintScreen (this=<optimized out>, mask=544, region=..., data=...) at ../../../kwin/libkwineffects/kwineffects.cpp:142
#17 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#18 0x00007fcddf968598 in KWin::Effect::paintScreen (this=<optimized out>, mask=544, region=..., data=...) at ../../../kwin/libkwineffects/kwineffects.cpp:142
#19 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#20 0x00007fcddf968598 in KWin::Effect::paintScreen (this=<optimized out>, mask=544, region=..., data=...) at ../../../kwin/libkwineffects/kwineffects.cpp:142
#21 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#22 0x00007fcddf968598 in KWin::Effect::paintScreen (this=<optimized out>, mask=544, region=..., data=...) at ../../../kwin/libkwineffects/kwineffects.cpp:142
#23 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#24 0x00007fcddf968598 in KWin::Effect::paintScreen (this=<optimized out>, mask=544, region=..., data=...) at ../../../kwin/libkwineffects/kwineffects.cpp:142
#25 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#26 0x00007fcdbc4056e1 in KWin::ZoomEffect::paintScreen (this=0x1fd8c30, mask=544, region=..., data=...) at ../../../kwin/effects/zoom/zoom.cpp:324
#27 0x00007fcde18fa466 in KWin::EffectsHandlerImpl::paintScreen (this=0x1f4d380, mask=544, region=..., data=...) at ../../kwin/effects.cpp:212
#28 0x00007fcde18dd376 in KWin::Scene::paintScreen (this=0x18d1c70, mask=0x7fff6f3c28e8, region=0x7fff6f3c2a40) at ../../kwin/scene.cpp:136
#29 0x00007fcde18f45f2 in KWin::SceneOpenGL::paint (this=0x18d1c70, damage=..., toplevels=...) at ../../kwin/scene_opengl_glx.cpp:459
#30 0x00007fcde18d792d in KWin::Workspace::performCompositing (this=0x17c2930) at ../../kwin/composite.cpp:433
#31 0x00007fcddd8c1489 in QObject::event (this=0x17c2930, e=<optimized out>) at kernel/qobject.cpp:1157
#32 0x00007fcddcc2b204 in notify_helper (e=0x7fff6f3c3120, receiver=0x17c2930, this=0x1524c50) at kernel/qapplication.cpp:4559
#33 QApplicationPrivate::notify_helper (this=0x1524c50, receiver=0x17c2930, e=0x7fff6f3c3120) at kernel/qapplication.cpp:4531
#34 0x00007fcddcc30083 in QApplication::notify (this=0x7fff6f3c3540, receiver=0x17c2930, e=0x7fff6f3c3120) at kernel/qapplication.cpp:4420
#35 0x00007fcde1057b26 in KApplication::notify (this=0x7fff6f3c3540, receiver=0x17c2930, event=0x7fff6f3c3120) at ../../kdeui/kernel/kapplication.cpp:311
#36 0x00007fcddd8a81ac in QCoreApplication::notifyInternal (this=0x7fff6f3c3540, receiver=0x17c2930, event=0x7fff6f3c3120) at kernel/qcoreapplication.cpp:876
#37 0x00007fcddd8d94b2 in sendEvent (event=0x7fff6f3c3120, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#38 QTimerInfoList::activateTimers (this=0x15261c8) at kernel/qeventdispatcher_unix.cpp:611
#39 0x00007fcddd8d9f94 in QEventDispatcherUNIX::processEvents (this=0x14dead0, flags=...) at kernel/qeventdispatcher_unix.cpp:930
#40 0x00007fcddccd0918 in QEventDispatcherX11::processEvents (this=0x14dead0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#41 0x00007fcddd8a6f92 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#42 0x00007fcddd8a71e7 in QEventLoop::exec (this=0x7fff6f3c3480, flags=...) at kernel/qeventloop.cpp:204
#43 0x00007fcddd8ac277 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#44 0x00007fcde1874696 in kdemain (argc=<optimized out>, argv=<optimized out>) at ../../kwin/main.cpp:517
#45 0x00007fcde14adead in __libc_start_main (main=<optimized out>, argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff6f3c3b98) at libc-start.c:228
#46 0x00000000004006e1 in _start ()

This bug may be a duplicate of or related to bug 264897.

Possible duplicates by query: bug 293129, bug 281487.

Reported using DrKonqi