Application: kwin (4.9.4)
KDE Platform Version: 4.9.4 (Compiled from sources)
Qt Version: 4.8.2
Operating System: Linux 3.3.8-gentoo x86_64
Distribution: "Gentoo Base System release 2.1"

-- Information about the crash:
- What I was doing when the application crashed:

I clicked the close button of an okular window (on my setup in the top right corner) - one of two in a tab-group. When it closed,  the cashew was visible behind the second window. The second window wobbled, then kwin crashed.

I could close the second window afterwards (the kwin crash dialog was already showing).

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7effbb8ed780 (LWP 17839))]

Thread 2 (Thread 0x7eff92770700 (LWP 17854)):
#0  0x00007effb690d7ec in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007eff92d5684b in radeon_drm_cs_emit_ioctl () from /usr/lib64/dri/r600_dri.so
#2  0x00007effb6908f26 in start_thread () from /lib64/libpthread.so.0
#3  0x00007effbb1264ed in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7effbb8ed780 (LWP 17839)):
[KCrash Handler]
#6  0x00007effb982f64f in KWin::EffectWindow::isUserMove() const () from /usr/lib64/libkwineffects.so.1
#7  0x00007eff91a8893f in KWin::WobblyWindowsEffect::slotWindowMaximizeStateChanged(KWin::EffectWindow*, bool, bool) () from /usr/lib64/kde4/kwin4_effect_builtins.so
#8  0x00007effb6cb5c62 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#9  0x00007effb9831ba8 in KWin::EffectsHandler::windowMaximizedStateChanged(KWin::EffectWindow*, bool, bool) () from /usr/lib64/libkwineffects.so.1
#10 0x00007effb6cb5c62 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#11 0x00007effbb43c740 in KWin::Client::clientMaximizedStateChanged(KWin::Client*, KDecorationDefines::MaximizeMode) () from /usr/lib64/libkdeinit4_kwin.so
#12 0x00007effbb4840c5 in KWin::Client::setMaximize(bool, bool) () from /usr/lib64/libkdeinit4_kwin.so
#13 0x00007effbb487c1a in KWin::Client::setQuickTileMode(QFlags<KWin::QuickTileFlag>, bool) () from /usr/lib64/libkdeinit4_kwin.so
#14 0x00007effbb43cf47 in KWin::Client::untab(QRect const&) () from /usr/lib64/libkdeinit4_kwin.so
#15 0x00007effbb42cd38 in KWin::Workspace::removeClient(KWin::Client*, KWin::allowed_t) () from /usr/lib64/libkdeinit4_kwin.so
#16 0x00007effbb44149e in KWin::Client::releaseWindow(bool) () from /usr/lib64/libkdeinit4_kwin.so
#17 0x00007effbb4596c1 in KWin::Client::windowEvent(_XEvent*) () from /usr/lib64/libkdeinit4_kwin.so
#18 0x00007effbb45a7e1 in KWin::Workspace::workspaceEvent(_XEvent*) () from /usr/lib64/libkdeinit4_kwin.so
#19 0x00007effbb44cf00 in KWin::Application::x11EventFilter(_XEvent*) () from /usr/lib64/libkdeinit4_kwin.so
#20 0x00007effb5e53d75 in qt_x11EventFilter(_XEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#21 0x00007effb5e61d9f in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#22 0x00007effb5e8abb2 in QEventDispatcherX11::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#23 0x00007effb6c9ef72 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#24 0x00007effb6c9f265 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#25 0x00007effb6ca3d1b in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#26 0x00007effbb44f4b5 in kdemain () from /usr/lib64/libkdeinit4_kwin.so
#27 0x00007effbb05d4cc in __libc_start_main () from /lib64/libc.so.6
#28 0x0000000000400789 in _start ()

This bug may be a duplicate of or related to bug 310142.

Possible duplicates by query: bug 310142.

Reported using DrKonqi