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:
- What I was doing when the application crashed:

at the time I was browsing the web using Firefox while developing Java applications. I didn't do something special when it crashed, perhaps moving/focusing a window or something similar.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f13407ca7a0 (LWP 1595))]

Thread 4 (Thread 0x7f1328955700 (LWP 1596)):
#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007f133ffb680f in _L_lock_12013 () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f133ffb48d8 in __libc_free (mem=0x7f13402c71c0) at malloc.c:3736
#3  0x00007f133c3e3645 in cleanup (this=0x1335d20, __in_chrg=<value optimized out>) at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:62
#4  ~QScopedPointer (this=0x1335d20, __in_chrg=<value optimized out>) at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:100
#5  QObject::~QObject (this=0x1335d20, __in_chrg=<value optimized out>) at kernel/qobject.cpp:818
#6  0x00007f133c3f8319 in QEventDispatcherUNIX::~QEventDispatcherUNIX (this=0x1335d20, __in_chrg=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:627
#7  0x00007f133c2e44d4 in QThreadPrivate::finish (arg=0x7f133c6fff60) at thread/qthread_unix.cpp:356
#8  0x00007f133c2e517d in ~__pthread_cleanup_class (arg=0x7f133c6fff60) at /usr/include/pthread.h:545
#9  QThreadPrivate::start (arg=0x7f133c6fff60) at thread/qthread_unix.cpp:279
#10 0x00007f13369d8d8c in start_thread (arg=0x7f1328955700) at pthread_create.c:304
#11 0x00007f134001e04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f132515d700 (LWP 1600)):
#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007f133ffb680f in _L_lock_12013 () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f133ffb48d8 in __libc_free (mem=0x7f13402c71c0) at malloc.c:3736
#3  0x00007f133c3f8540 in QEventDispatcherUNIX::unregisterSocketNotifier (this=<value optimized out>, notifier=<value optimized out>) at kernel/qeventdispatcher_unix.cpp:802
#4  0x00007f133c3f97a4 in QEventDispatcherUNIXPrivate::doSelect (this=0x27d4630, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:261
#5  0x00007f133c3fa04a in QEventDispatcherUNIX::processEvents (this=0x2682040, flags=...) at kernel/qeventdispatcher_unix.cpp:919
#6  0x00007f133c3cb882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f133c3cbabc in QEventLoop::exec (this=0x7f132515cdb0, flags=...) at kernel/qeventloop.cpp:201
#8  0x00007f133c2e2924 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#9  0x00007f133c3adc2f in QInotifyFileSystemWatcherEngine::run (this=0x27d3600) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f133c2e5175 in QThreadPrivate::start (arg=0x27d3600) at thread/qthread_unix.cpp:320
#11 0x00007f13369d8d8c in start_thread (arg=0x7f132515d700) at pthread_create.c:304
#12 0x00007f134001e04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f132495c700 (LWP 1601)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f133ee7d2a2 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f133f196180) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f133ee7d2d9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x7f133f1a4254) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f13369d8d8c in start_thread (arg=0x7f132495c700) at pthread_create.c:304
#4  0x00007f134001e04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f13407ca7a0 (LWP 1595)):
[KCrash Handler]
#6  0x00007f133ffb1bc4 in _int_malloc (av=0x7f13402c71c0, bytes=<value optimized out>) at malloc.c:4636
#7  0x00007f133ffb431e in __libc_malloc (bytes=65472) at malloc.c:3660
#8  0x00007f132753d213 in ?? () from /lib/x86_64-linux-gnu/libdrm_intel.so.1
#9  0x00007f132753d34d in ?? () from /lib/x86_64-linux-gnu/libdrm_intel.so.1
#10 0x00007f1327efa17e in brw_upload_state () from /usr/lib/dri/i965_dri.so
#11 0x00007f1327ee90f2 in brw_draw_prims () from /usr/lib/dri/i965_dri.so
#12 0x00007f1327b70100 in vbo_exec_vtx_flush () from /usr/lib/dri/libdricore.so
#13 0x00007f1327b6de2c in vbo_exec_FlushVertices_internal () from /usr/lib/dri/libdricore.so
#14 0x00007f1327b6e02a in vbo_exec_FlushVertices () from /usr/lib/dri/libdricore.so
#15 0x00007f1327aab0ce in _mesa_PopAttrib () from /usr/lib/dri/libdricore.so
#16 0x00007f133e468ac5 in KWin::PaintClipper::Iterator::~Iterator (this=0x7fff892e52c0, __in_chrg=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:873
#17 0x00007f133e471d62 in KWin::renderGLGeometry (region=..., count=4, vertices=0x3d93c40, texture=0x39e43e0, color=0x0, dim=2, stride=0) at ../../../kwin/lib/kwinglutils.cpp:180
#18 0x00007f1340397c98 in KWin::SceneOpenGL::Window::renderQuads (this=<value optimized out>, region=..., quads=...) at ../../kwin/scene_opengl.cpp:1678
#19 0x00007f134039f613 in KWin::SceneOpenGL::Window::performPaint (this=0x39c3ee0, mask=9, region=..., data=...) at ../../kwin/scene_opengl.cpp:1559
#20 0x00007f134038a419 in KWin::Scene::finalDrawWindow (this=<value optimized out>, w=<value optimized out>, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../kwin/scene.cpp:332
#21 0x00007f13403a7b76 in KWin::EffectsHandlerImpl::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:247
#22 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#23 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#24 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#25 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#26 0x00007f1326e93169 in KWin::ShadowEffect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/shadow/shadow.cpp:250
#27 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#28 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#29 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#30 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#31 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#32 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#33 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#34 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#35 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#36 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#37 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#38 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#39 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#40 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#41 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#42 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#43 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#44 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#45 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#46 0x00007f1326ec7301 in KWin::InvertEffect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/invert/invert.cpp:115
#47 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#48 0x00007f133e4678a8 in KWin::Effect::drawWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:262
#49 0x00007f13403a7c07 in KWin::EffectsHandlerImpl::drawWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:243
#50 0x00007f1340389cd8 in KWin::Scene::finalPaintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../kwin/scene.cpp:323
#51 0x00007f13403a7d06 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:204
#52 0x00007f1326e5f732 in KWin::DashboardEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/dashboard/dashboard.cpp:100
#53 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#54 0x00007f1326e760c5 in KWin::LogoutEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/logout/logout.cpp:198
#55 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#56 0x00007f133e4679a8 in KWin::Effect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:242
#57 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#58 0x00007f1326e7d4cd in KWin::PresentWindowsEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/presentwindows/presentwindows.cpp:379
#59 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#60 0x00007f1326e73449 in KWin::HighlightWindowEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/highlightwindow/highlightwindow.cpp:104
#61 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#62 0x00007f1326ebf831 in KWin::FlipSwitchEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/flipswitch/flipswitch.cpp:543
#63 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#64 0x00007f1326e64668 in KWin::DesktopGridEffect::paintWindow (this=0x25ca560, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:400
#65 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#66 0x00007f1326e96bb4 in KWin::SlideEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/slide/slide.cpp:165
#67 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#68 0x00007f1326e58831 in KWin::BoxSwitchEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/boxswitch/boxswitch.cpp:245
#69 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#70 0x00007f133e4679a8 in KWin::Effect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:242
#71 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#72 0x00007f1326ea76eb in KWin::CoverSwitchEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=..., data=...) at ../../../kwin/effects/coverswitch/coverswitch.cpp:504
#73 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#74 0x00007f1326e74dfe in KWin::LoginEffect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/effects/login/login.cpp:69
#75 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#76 0x00007f133e4679a8 in KWin::Effect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:242
#77 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#78 0x00007f133e4679a8 in KWin::Effect::paintWindow (this=<value optimized out>, w=0x44cab90, mask=9, region=<value optimized out>, data=<value optimized out>) at ../../../kwin/lib/kwineffects.cpp:242
#79 0x00007f13403a7d97 in KWin::EffectsHandlerImpl::paintWindow (this=0x250b3e0, w=0x44cab90, mask=9, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:200
#80 0x00007f134038a617 in KWin::Scene::paintWindow (this=<value optimized out>, w=0x39c3ee0, mask=9, region=..., quads=<value optimized out>) at ../../kwin/scene.cpp:317
#81 0x00007f134038af6a in KWin::Scene::paintSimpleScreen (this=0x13d9d30, orig_mask=8, region=...) at ../../kwin/scene.cpp:288
#82 0x00007f1340389c21 in KWin::Scene::finalPaintScreen (this=0x13d9d30, mask=8, region=<value optimized out>, data=<value optimized out>) at ../../kwin/scene.cpp:180
#83 0x00007f13403a7f19 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:173
#84 0x00007f133e467a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=8, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#85 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#86 0x00007f1326e7644d in KWin::LogoutEffect::paintScreen (this=0x25f4170, mask=8, region=..., data=...) at ../../../kwin/effects/logout/logout.cpp:207
#87 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#88 0x00007f1326e9157b in KWin::ShadowEffect::paintScreen (this=0x25a4d80, mask=8, region=..., data=...) at ../../../kwin/effects/shadow/shadow.cpp:189
#89 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#90 0x00007f1326e7afbd in KWin::PresentWindowsEffect::paintScreen (this=0x25a76d0, mask=8, region=..., data=...) at ../../../kwin/effects/presentwindows/presentwindows.cpp:205
#91 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#92 0x00007f133e467a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=8, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#93 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#94 0x00007f1326ec1c05 in KWin::FlipSwitchEffect::paintScreen (this=0x25524c0, mask=8, region=..., data=...) at ../../../kwin/effects/flipswitch/flipswitch.cpp:148
#95 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#96 0x00007f1326e62365 in KWin::DesktopGridEffect::paintScreen (this=0x25ca560, mask=8, region=..., data=...) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:155
#97 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#98 0x00007f1326e97b8f in KWin::SlideEffect::paintScreen (this=<value optimized out>, mask=8, region=..., data=...) at ../../../kwin/effects/slide/slide.cpp:86
#99 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#100 0x00007f1326e5bbad in KWin::BoxSwitchEffect::paintScreen (this=0x25eadd0, mask=8, region=..., data=...) at ../../../kwin/effects/boxswitch/boxswitch.cpp:143
#101 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#102 0x00007f133e467a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=8, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#103 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#104 0x00007f1326eaad86 in KWin::CoverSwitchEffect::paintScreen (this=0x2585dd0, mask=8, region=..., data=...) at ../../../kwin/effects/coverswitch/coverswitch.cpp:126
#105 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#106 0x00007f133e467a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=8, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#107 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#108 0x00007f133e467a18 in KWin::Effect::paintScreen (this=<value optimized out>, mask=8, region=<value optimized out>, data=...) at ../../../kwin/lib/kwineffects.cpp:227
#109 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#110 0x00007f1326ea139b in KWin::ZoomEffect::paintScreen (this=0x2612cf0, mask=8, region=..., data=...) at ../../../kwin/effects/zoom/zoom.cpp:341
#111 0x00007f13403a7fa3 in KWin::EffectsHandlerImpl::paintScreen (this=0x250b3e0, mask=8, region=<value optimized out>, data=...) at ../../kwin/effects.cpp:169
#112 0x00007f134038c0af in KWin::Scene::paintScreen (this=0x13d9d30, mask=0x7fff892e8b8c, region=0x7fff892e8c50) at ../../kwin/scene.cpp:137
#113 0x00007f134039fef3 in KWin::SceneOpenGL::paint (this=0x13d9d30, damage=..., toplevels=<value optimized out>) at ../../kwin/scene_opengl.cpp:772
#114 0x00007f1340387396 in KWin::Workspace::performCompositing (this=0x16f9210) at ../../kwin/composite.cpp:448
#115 0x00007f133c3e01c9 in QObject::event (this=0x16f9210, e=<value optimized out>) at kernel/qobject.cpp:1190
#116 0x00007f133b78d9e4 in QApplicationPrivate::notify_helper (this=0x12bb8e0, receiver=0x16f9210, e=0x7fff892e93e0) at kernel/qapplication.cpp:4462
#117 0x00007f133b7923aa in QApplication::notify (this=<value optimized out>, receiver=0x16f9210, e=0x7fff892e93e0) at kernel/qapplication.cpp:4341
#118 0x00007f133fb19866 in KApplication::notify (this=0x7fff892e97e0, receiver=0x16f9210, event=0x7fff892e93e0) at ../../kdeui/kernel/kapplication.cpp:311
#119 0x00007f133c3cc49c in QCoreApplication::notifyInternal (this=0x7fff892e97e0, receiver=0x16f9210, event=0x7fff892e93e0) at kernel/qcoreapplication.cpp:731
#120 0x00007f133c3f9f12 in sendEvent (this=0x12bc4a0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#121 QTimerInfoList::activateTimers (this=0x12bc4a0) at kernel/qeventdispatcher_unix.cpp:604
#122 0x00007f133c3fa05b in QEventDispatcherUNIX::processEvents (this=0x1260340, flags=...) at kernel/qeventdispatcher_unix.cpp:923
#123 0x00007f133b835c0c in QEventDispatcherX11::processEvents (this=0x1260340, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#124 0x00007f133c3cb882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#125 0x00007f133c3cbabc in QEventLoop::exec (this=0x7fff892e9720, flags=...) at kernel/qeventloop.cpp:201
#126 0x00007f133c3cfecb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#127 0x00007f13403251ec in kdemain (argc=<value optimized out>, argv=0x7fff892e9e78) at ../../kwin/main.cpp:542
#128 0x00007f133ff56eff in __libc_start_main (main=0x400740 <main(int, char**)>, argc=1, ubp_av=0x7fff892e9e78, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff892e9e68) at libc-start.c:226
#129 0x0000000000400669 in _start ()

Reported using DrKonqi