Application: kwin (4.6.2 (4.6.2))
KDE Platform Version: 4.6.2 (4.6.2)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-8-generic x86_64
Distribution: Ubuntu 11.04

-- Information about the crash:
I was video chatting in Google Plus in fullscreen mode. When I returned to normal sized mode, KWin crashed.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f8d4ec8e7a0 (LWP 2018))]

Thread 3 (Thread 0x7f8d337a9700 (LWP 2036)):
#0  0x00007f8d4e4d8143 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f8d4a8b632c in qt_safe_select (nfds=17, fdread=0x3258540, fdwrite=0x32587d8, fdexcept=0x3258a70, orig_timeout=<value optimized out>) at kernel/qcore_unix.cpp:82
#2  0x00007f8d4a8bb3d0 in QEventDispatcherUNIXPrivate::doSelect (this=0x3258380, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:219
#3  0x00007f8d4a8bc04a in QEventDispatcherUNIX::processEvents (this=0x3108580, flags=...) at kernel/qeventdispatcher_unix.cpp:919
#4  0x00007f8d4a88d882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f8d4a88dabc in QEventLoop::exec (this=0x7f8d337a8db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f8d4a7a4924 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#7  0x00007f8d4a86fc2f in QInotifyFileSystemWatcherEngine::run (this=0x2f71f10) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f8d4a7a7175 in QThreadPrivate::start (arg=0x2f71f10) at thread/qthread_unix.cpp:320
#9  0x00007f8d44e9ad8c in start_thread (arg=0x7f8d337a9700) at pthread_create.c:304
#10 0x00007f8d4e4e004d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f8d32fa8700 (LWP 2037)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f8d4d33f2a2 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f8d4d658180) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f8d4d33f2d9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x7f8d4d666254) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f8d44e9ad8c in start_thread (arg=0x7f8d32fa8700) at pthread_create.c:304
#4  0x00007f8d4e4e004d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8d4ec8e7a0 (LWP 2018)):
[KCrash Handler]
#6  intel_region_buffer (intel=0x1c865e0, region=0x0, flag=2) at intel_regions.c:514
#7  0x00007f8d364e86c2 in intelClearWithBlit (ctx=0x1c865e0, mask=2) at intel_blit.c:262
#8  0x00007f8d364ead2a in intelClear (ctx=0x1c865e0, mask=2) at intel_clear.c:177
#9  0x00007f8d4e856ce7 in KWin::SceneOpenGL::paintBackground (this=<value optimized out>, region=<value optimized out>) at ../../kwin/scene_opengl.cpp:921
#10 0x00007f8d4e84e88f in KWin::Scene::paintGenericScreen (this=0x1c84200, orig_mask=32) at ../../kwin/scene.cpp:188
#11 0x00007f8d4e84bc7a in KWin::Scene::finalPaintScreen (this=0x1c84200, mask=32, region=<value optimized out>, data=<value optimized out>) at ../../kwin/scene.cpp:178
#12 0x00007f8d4e869f19 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=32, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:173
#13 0x00007f8d355675a6 in KWin::StartupFeedbackEffect::paintScreen (this=0x2e38ab0, mask=32, region=<value optimized out>, data=...) at ../../../kwin/effects/startupfeedback/startupfeedback.cpp:166
#14 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=32, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#15 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#16 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=32, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#17 0x00007f8d3550e44d in KWin::LogoutEffect::paintScreen (this=0x2fda4f0, mask=32, region=..., data=...) at ../../../kwin/effects/logout/logout.cpp:207
#18 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=32, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#19 0x00007f8d3552957b in KWin::ShadowEffect::paintScreen (this=0x2ec2bc0, mask=32, region=..., data=...) at ../../../kwin/effects/shadow/shadow.cpp:189
#20 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=32, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#21 0x00007f8d3553be68 in KWin::BlurEffect::paintScreen (this=<value optimized out>, mask=32, region=..., data=...) at ../../../kwin/effects/blur/blur.cpp:230
#22 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#23 0x00007f8d35512fbd in KWin::PresentWindowsEffect::paintScreen (this=0x2e30590, mask=0, region=..., data=...) at ../../../kwin/effects/presentwindows/presentwindows.cpp:205
#24 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#25 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#26 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#27 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#28 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#29 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#30 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#31 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#32 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#33 0x00007f8d354fa365 in KWin::DesktopGridEffect::paintScreen (this=0x2e33940, mask=0, region=..., data=...) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:155
#34 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#35 0x00007f8d3552fb8f in KWin::SlideEffect::paintScreen (this=<value optimized out>, mask=0, region=..., data=...) at ../../../kwin/effects/slide/slide.cpp:86
#36 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#37 0x00007f8d354f3bad in KWin::BoxSwitchEffect::paintScreen (this=0x314b750, mask=0, region=..., data=...) at ../../../kwin/effects/boxswitch/boxswitch.cpp:143
#38 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#39 0x00007f8d3554a256 in KWin::CubeEffect::paintScreen (this=<value optimized out>, mask=0, region=..., data=...) at ../../../kwin/effects/cube/cube.cpp:698
#40 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#41 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#42 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#43 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#44 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#45 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#46 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#47 0x00007f8d35542d86 in KWin::CoverSwitchEffect::paintScreen (this=0x2fbc3b0, mask=0, region=..., data=...) at ../../../kwin/effects/coverswitch/coverswitch.cpp:126
#48 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#49 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#50 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#51 0x00007f8d4c929a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=0, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#52 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#53 0x00007f8d3553939b in KWin::ZoomEffect::paintScreen (this=0x30989a0, mask=0, region=..., data=...) at ../../../kwin/effects/zoom/zoom.cpp:341
#54 0x00007f8d4e869fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x2db6570, mask=0, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#55 0x00007f8d4e84e0af in KWin::Scene::paintScreen (this=0x1c84200, mask=0x7fff37e5dc7c, region=0x7fff37e5dd40) at ../../kwin/scene.cpp:137
#56 0x00007f8d4e861ef3 in KWin::SceneOpenGL::paint (this=0x1c84200, damage=..., toplevels=<value optimized out>) at ../../kwin/scene_opengl.cpp:772
#57 0x00007f8d4e849396 in KWin::Workspace::performCompositing (this=0x1fb1b90) at ../../kwin/composite.cpp:448
#58 0x00007f8d4a8a21c9 in QObject::event (this=0x1fb1b90, e=<value optimized out>) at kernel/qobject.cpp:1190
#59 0x00007f8d49c4f9e4 in QApplicationPrivate::notify_helper (this=0x1b7be40, receiver=0x1fb1b90, e=0x7fff37e5e4d0) at kernel/qapplication.cpp:4462
#60 0x00007f8d49c543aa in QApplication::notify (this=<value optimized out>, receiver=0x1fb1b90, e=0x7fff37e5e4d0) at kernel/qapplication.cpp:4341
#61 0x00007f8d4dfdb866 in KApplication::notify (this=0x7fff37e5e8d0, receiver=0x1fb1b90, event=0x7fff37e5e4d0) at ../../kdeui/kernel/kapplication.cpp:311
#62 0x00007f8d4a88e49c in QCoreApplication::notifyInternal (this=0x7fff37e5e8d0, receiver=0x1fb1b90, event=0x7fff37e5e4d0) at kernel/qcoreapplication.cpp:731
#63 0x00007f8d4a8bbf12 in sendEvent (this=0x1b7d080) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#64 QTimerInfoList::activateTimers (this=0x1b7d080) at kernel/qeventdispatcher_unix.cpp:604
#65 0x00007f8d4a8bc05b in QEventDispatcherUNIX::processEvents (this=0x1b21340, flags=...) at kernel/qeventdispatcher_unix.cpp:923
#66 0x00007f8d49cf7c0c in QEventDispatcherX11::processEvents (this=0x1b21340, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#67 0x00007f8d4a88d882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#68 0x00007f8d4a88dabc in QEventLoop::exec (this=0x7fff37e5e810, flags=...) at kernel/qeventloop.cpp:201
#69 0x00007f8d4a891ecb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#70 0x00007f8d4e7e71ec in kdemain (argc=<value optimized out>, argv=0x7fff37e5ef68) at ../../kwin/main.cpp:542
#71 0x00007f8d4e418eff in __libc_start_main (main=0x400740 <main(int, char**)>, argc=3, ubp_av=0x7fff37e5ef68, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff37e5ef58) at libc-start.c:226
#72 0x0000000000400669 in _start ()

Possible duplicates by query: bug 277203, bug 276860, bug 276797, bug 276695, bug 276588.

Reported using DrKonqi