Application: kwin (4.4.3 (KDE 4.4.3))
KDE Platform Version: 4.4.3 (KDE 4.4.3)
Qt Version: 4.6.2
Operating System: Linux 2.6.33-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
I unhide the borders window decoration of firefox (I usually have theme hidden), and during some manipulation (either right clic on window title or moving the window to the top to get a maximised window), crash of kwin occured.

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#5  QList<KWin::Client*>::detach (this=0x0, index=0, pos=...) at /usr/include/QtCore/qlist.h:122
#6  QList<KWin::Client*>::operator[] (this=0x0, index=0, pos=...) at /usr/include/QtCore/qlist.h:448
#7  KWin::ClientGroup::displayClientMenu (this=0x0, index=0, pos=...) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.4.3/kwin/clientgroup.cpp:245
#8  0x00007f71a6224241 in Oxygen::OxygenClient::mousePressEvent (this=0x2ecc990, event=0x7fff10efa8c0)
    at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.4.3/kwin/clients/oxygen/oxygenclient.cpp:1470
#9  0x00007f71a6224490 in Oxygen::OxygenClient::eventFilter (this=0x2ecc990, object=0x2cb5490, event=0x7fff10efa8c0)
    at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.4.3/kwin/clients/oxygen/oxygenclient.cpp:1267
#10 0x00007f71b2850177 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x2cb5490, event=0x7fff10efa8c0) at kernel/qcoreapplication.cpp:819
#11 0x00007f71b2f9a95c in QApplicationPrivate::notify_helper (this=0x1c82640, receiver=0x2cb5490, e=0x7fff10efa8c0) at kernel/qapplication.cpp:4300
#12 0x00007f71b2fa163b in QApplication::notify (this=0x7fff10efb400, receiver=0x2cb5490, e=0x7fff10efa8c0) at kernel/qapplication.cpp:3869
#13 0x00007f71b642ded6 in KApplication::notify (this=0x7fff10efb400, receiver=0x2cb5490, event=0x7fff10efa8c0) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.4.3/kdeui/kernel/kapplication.cpp:302
#14 0x00007f71b2850d5c in QCoreApplication::notifyInternal (this=0x7fff10efb400, receiver=0x2cb5490, event=0x7fff10efa8c0) at kernel/qcoreapplication.cpp:704
#15 0x00007f71b2fa080e in QCoreApplication::sendEvent (receiver=0x2cb5490, event=0x7fff10efa8c0, alienWidget=0x0, nativeWidget=0x2cb5490, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>, spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#16 QApplicationPrivate::sendMouseEvent (receiver=0x2cb5490, event=0x7fff10efa8c0, alienWidget=0x0, nativeWidget=0x2cb5490, buttonDown=<value optimized out>, lastMouseReceiver=<value optimized out>, 
    spontaneous=true) at kernel/qapplication.cpp:2969
#17 0x00007f71b30204eb in QETWidget::translateMouseEvent (this=0x2cb5490, event=<value optimized out>) at kernel/qapplication_x11.cpp:4368
#18 0x00007f71b301ee5c in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff10efb040) at kernel/qapplication_x11.cpp:3501
#19 0x00007f71b3049942 in x11EventSourceDispatch (s=0x1c86490, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#20 0x00007f71abe6bb33 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0x00007f71abe6c310 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#22 0x00007f71abe6c5ad in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0x00007f71b287a1b3 in QEventDispatcherGlib::processEvents (this=0x1c43920, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#24 0x00007f71b304953e in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#25 0x00007f71b284f682 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#26 0x00007f71b284fa5c in QEventLoop::exec (this=0x7fff10efb340, flags=) at kernel/qeventloop.cpp:201
#27 0x00007f71b285379b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#28 0x00007f71b6bdbca0 in kdemain (argc=<value optimized out>, argv=0x7fff10efb918) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.4.3/kwin/main.cpp:526
#29 0x00007f71b6851b1d in __libc_start_main () from /lib/libc.so.6
#30 0x0000000000400629 in _start ()

This bug may be a duplicate of or related to bug 222813, bug 235870.

Possible duplicates by query: bug 235870, bug 222813.

Reported using DrKonqi