Application: kwin (4.8.2 (4.8.2))
KDE Platform Version: 4.8.2 (4.8.2)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-24-generic-pae i686
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Har dto describe, using Libre Office Calc, Writer, Thunderbird, Firefox. Was opening and
closing windows, switching with Alt+Tab.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb1a6d740 (LWP 3041))]

Thread 3 (Thread 0xacb54b40 (LWP 3353)):
#0  0xb7724424 in __kernel_vsyscall ()
#1  0xb74efaf1 in select () from /lib/i386-linux-gnu/libc.so.6
#2  0xb5f6a42a in qt_safe_select (nfds=20, fdread=0xac20058c, fdwrite=0xac2007a0, fdexcept=0xac2009b4, orig_timeout=0x0) at kernel/qcore_unix.cpp:83
#3  0xb5f6ea1b in QEventDispatcherUNIX::select (this=0xac200488, nfds=20, readfds=0xac20058c, writefds=0xac2007a0, exceptfds=0xac2009b4, timeout=0x0) at kernel/qeventdispatcher_unix.cpp:639
#4  0xb5f6fd2f in QEventDispatcherUNIXPrivate::doSelect (this=0xac200498, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:223
#5  0xb5f701f4 in QEventDispatcherUNIX::processEvents (this=0xac200488, flags=...) at kernel/qeventdispatcher_unix.cpp:926
#6  0xb5f3950d in QEventLoop::processEvents (this=0xacb54240, flags=...) at kernel/qeventloop.cpp:149
#7  0xb5f397a9 in QEventLoop::exec (this=0xacb54240, flags=...) at kernel/qeventloop.cpp:204
#8  0xb5e2294c in QThread::exec (this=0xa1cc090) at thread/qthread.cpp:501
#9  0xb5f16b5d in QInotifyFileSystemWatcherEngine::run (this=0xa1cc090) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb5e25de0 in QThreadPrivate::start (arg=0xa1cc090) at thread/qthread_unix.cpp:298
#11 0xb2a0ad4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb74f6ace in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0xac1ffb40 (LWP 3354)):
#0  0xb7724424 in __kernel_vsyscall ()
#1  0xb2a0e96b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb75043dc in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb6613029 in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb661306f in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb2a0ad4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0xb74f6ace in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb1a6d740 (LWP 3041)):
[KCrash Handler]
#7  0x00000000 in ?? ()
#8  0xacf64d60 in KWin::CoverSwitchEffect::postPaintScreen (this=0xa075ea0) at ../../../kwin/effects/coverswitch/coverswitch.cpp:411
#9  0xb76a066e in KWin::EffectsHandlerImpl::postPaintScreen (this=0x9faf698) at ../../kwin/effects.cpp:228
#10 0xb68b903f in KWin::Effect::postPaintScreen (this=0xa04a528) at ../../../kwin/libkwineffects/kwineffects.cpp:147
#11 0xb76a066e in KWin::EffectsHandlerImpl::postPaintScreen (this=0x9faf698) at ../../kwin/effects.cpp:228
#12 0xb767b23f in KWin::Scene::paintScreen (this=0x9cdb938, mask=0xbfeeab94, region=0xbfeeac28) at ../../kwin/scene.cpp:159
#13 0xb7693909 in KWin::SceneOpenGL::paint (this=0x9cdb938, damage=..., toplevels=...) at ../../kwin/scene_opengl_glx.cpp:459
#14 0xb7674844 in KWin::Workspace::performCompositing (this=0x9ed3cf0) at ../../kwin/composite.cpp:417
#15 0xb5f55ac4 in QObject::event (this=0x9ed3cf0, e=0xbfeeb10c) at kernel/qobject.cpp:1157
#16 0xb5424ed4 in notify_helper (e=0xbfeeb10c, receiver=0x9ed3cf0, this=0x9bc9570) at kernel/qapplication.cpp:4559
#17 QApplicationPrivate::notify_helper (this=0x9bc9570, receiver=0x9ed3cf0, e=0xbfeeb10c) at kernel/qapplication.cpp:4531
#18 0xb542a30d in QApplication::notify (this=0xbfeeb10c, receiver=0x9ed3cf0, e=0xbfeeb10c) at kernel/qapplication.cpp:4288
#19 0xb71b4b21 in KApplication::notify (this=0xbfeeb418, receiver=0x9ed3cf0, event=0xbfeeb10c) at ../../kdeui/kernel/kapplication.cpp:311
#20 0xb761d5ef in notify (e=0xbfeeb10c, o=0x9ed3cf0, this=0xbfeeb418) at ../../kwin/main.cpp:368
#21 KWin::Application::notify (this=0xbfeeb418, o=0x9ed3cf0, e=0xbfeeb10c) at ../../kwin/main.cpp:364
#22 0xb5f3a97e in QCoreApplication::notifyInternal (this=0xbfeeb418, receiver=0x9ed3cf0, event=0xbfeeb10c) at kernel/qcoreapplication.cpp:876
#23 0xb5f6f990 in sendEvent (event=0xbfeeb10c, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#24 QTimerInfoList::activateTimers (this=0x9bc9e14) at kernel/qeventdispatcher_unix.cpp:611
#25 0xb5f70207 in QEventDispatcherUNIX::processEvents (this=0x9b90ea0, flags=...) at kernel/qeventdispatcher_unix.cpp:930
#26 0xb54deb6e in QEventDispatcherX11::processEvents (this=0x9b90ea0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#27 0xb5f3950d in QEventLoop::processEvents (this=0xbfeeb354, flags=...) at kernel/qeventloop.cpp:149
#28 0xb5f397a9 in QEventLoop::exec (this=0xbfeeb354, flags=...) at kernel/qeventloop.cpp:204
#29 0xb5f3eeba in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#30 0xb5422a74 in QApplication::exec () at kernel/qapplication.cpp:3820
#31 0xb76205b5 in kdemain (argc=1, argv=0xbfeeb6c4) at ../../kwin/main.cpp:541
#32 0x0804850b in main (argc=1, argv=0xbfeeb6c4) at kwin_dummy.cpp:3

Possible duplicates by query: bug 171593.

Reported using DrKonqi