Application: kwin_gles (4.8.00 (4.8.0 "release 1")
KDE Platform Version: 4.8.00 (4.8.0 "release 1"
Qt Version: 4.8.0
Operating System: Linux 3.2.2-4-desktop x86_64
Distribution: "openSUSE 12.2 Milestone 0 (x86_64)"

-- Information about the crash:
the crash happens every now and then.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin_gles), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fd874fd7780 (LWP 2473))]

Thread 2 (Thread 0x7fd858d09700 (LWP 2501)):
#0  0x00007fd86fa3aed6 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fd8712888f2 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fd871581e80) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007fd871288929 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007fd86fa36f8f in start_thread () from /lib64/libpthread.so.0
#4  0x00007fd87481959d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fd874fd7780 (LWP 2473)):
[KCrash Handler]
#6  KWin::EffectsHandlerImpl::currentTabBoxWindowList (this=<optimized out>) at /usr/src/debug/kde-workspace-4.8.0/kwin/effects.cpp:2053
#7  0x00007fd858d9aad6 in KWin::FlipSwitchEffect::paintScreen (this=0xb0fdf0, region=..., data=<optimized out>, mask=<optimized out>) at /usr/src/debug/kde-workspace-4.8.0/kwin/effects/flipswitch/flipswitch.cpp:153
#8  0x00007fd858d9cd92 in KWin::FlipSwitchEffect::paintScreen (this=0xb0fdf0, mask=32, region=..., data=...) at /usr/src/debug/kde-workspace-4.8.0/kwin/effects/flipswitch/flipswitch.cpp:150
#9  0x00007fd874ba9f7b in KWin::EffectsHandlerImpl::paintScreen (this=0x92ede0, mask=32, region=..., data=...) at /usr/src/debug/kde-workspace-4.8.0/kwin/effects.cpp:219
#10 0x00007fd874b8cd75 in KWin::Scene::paintScreen (this=0x847d80, mask=0x7fff22aef278, region=0x7fff22aef360) at /usr/src/debug/kde-workspace-4.8.0/kwin/scene.cpp:156
#11 0x00007fd874b9f8c2 in KWin::SceneOpenGL::paint (this=0x847d80, damage=..., toplevels=<optimized out>) at /usr/src/debug/kde-workspace-4.8.0/kwin/scene_opengl_egl.cpp:188
#12 0x00007fd874b871d8 in KWin::Workspace::performCompositing (this=0x6ee140) at /usr/src/debug/kde-workspace-4.8.0/kwin/composite.cpp:417
#13 0x00007fd86fde4229 in QObject::event (this=0x6ee140, e=<optimized out>) at kernel/qobject.cpp:1157
#14 0x00007fd86ef33df4 in notify_helper (e=0x7fff22aefa40, receiver=0x6ee140, this=0x67b300) at kernel/qapplication.cpp:4550
#15 QApplicationPrivate::notify_helper (this=0x67b300, receiver=0x6ee140, e=0x7fff22aefa40) at kernel/qapplication.cpp:4522
#16 0x00007fd86ef38c73 in QApplication::notify (this=0x7fff22aefed0, receiver=0x6ee140, e=0x7fff22aefa40) at kernel/qapplication.cpp:4411
#17 0x00007fd8742fe786 in KApplication::notify (this=0x7fff22aefed0, receiver=0x6ee140, event=0x7fff22aefa40) at /usr/src/debug/kdelibs-4.8.0/kdeui/kernel/kapplication.cpp:311
#18 0x00007fd86fdcb48c in QCoreApplication::notifyInternal (this=0x7fff22aefed0, receiver=0x6ee140, event=0x7fff22aefa40) at kernel/qcoreapplication.cpp:876
#19 0x00007fd86fdfc2b8 in sendEvent (event=0x7fff22aefa40, receiver=<optimized out>) at kernel/qcoreapplication.h:231
#20 QTimerInfoList::activateTimers (this=0x67bcf8) at kernel/qeventdispatcher_unix.cpp:625
#21 0x00007fd86fdfd254 in QEventDispatcherUNIX::processEvents (this=0x607a70, flags=...) at kernel/qeventdispatcher_unix.cpp:944
#22 0x00007fd86efd7cf8 in QEventDispatcherX11::processEvents (this=0x607a70, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#23 0x00007fd86fdca272 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#24 0x00007fd86fdca4c7 in QEventLoop::exec (this=0x7fff22aefe10, flags=...) at kernel/qeventloop.cpp:204
#25 0x00007fd86fdcf025 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#26 0x00007fd874b3cff6 in kdemain (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kde-workspace-4.8.0/kwin/main.cpp:541
#27 0x00007fd8747533ed in __libc_start_main () from /lib64/libc.so.6
#28 0x0000000000400691 in _start () at ../sysdeps/x86_64/elf/start.S:113

Reported using DrKonqi