Application: kwin (4.5.95 (4.6 RC2))
KDE Platform Version: 4.5.95 (4.6 RC2)
Qt Version: 4.7.1
Operating System: Linux 2.6.37-12-generic i686
Distribution: Ubuntu natty (development branch)

-- Information about the crash:
While I was hovering over the  "move window to group"  button using KWin,it crashed unexpectedly.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77ea940 (LWP 11875))]

Thread 3 (Thread 0xb27cfb70 (LWP 11878)):
#0  0x00bb8d31 in clock_gettime () from /lib/librt.so.1
#1  0x026d66a8 in do_gettime () at tools/qelapsedtimer_unix.cpp:123
#2  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#3  0x027a3a05 in updateCurrentTime (this=0x9447e78, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:339
#4  QEventDispatcherUNIXPrivate::doSelect (this=0x9447e78, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:182
#5  0x027a4806 in QEventDispatcherUNIX::processEvents (this=0x938ec28, flags=...) at kernel/qeventdispatcher_unix.cpp:918
#6  0x02773859 in QEventLoop::processEvents (this=0xb27cf280, flags=...) at kernel/qeventloop.cpp:149
#7  0x02773af2 in QEventLoop::exec (this=0xb27cf280, flags=...) at kernel/qeventloop.cpp:201
#8  0x0267dc08 in QThread::exec (this=0x9388d88) at thread/qthread.cpp:490
#9  0x027556fb in QInotifyFileSystemWatcherEngine::run (this=0x9388d88) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x02680689 in QThreadPrivate::start (arg=0x9388d88) at thread/qthread_unix.cpp:285
#11 0x00b86e79 in start_thread () from /lib/libpthread.so.0
#12 0x00e384ee in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb1fc6b70 (LWP 11879)):
#0  0x0015e416 in __kernel_vsyscall ()
#1  0x00b8b46c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x00e45fbd in pthread_cond_wait () from /lib/libc.so.6
#3  0x045ec647 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x46ff1c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#4  0x045ec681 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x46ff1c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#5  0x00b86e79 in start_thread () from /lib/libpthread.so.0
#6  0x00e384ee in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb77ea940 (LWP 11875)):
[KCrash Handler]
#7  ref (this=0x94741a8, full=true) at /usr/include/qt4/QtCore/qatomic_i386.h:120
#8  QString (this=0x94741a8, full=true) at /usr/include/qt4/QtCore/qstring.h:729
#9  operator+ (this=0x94741a8, full=true) at /usr/include/qt4/QtCore/qstring.h:1024
#10 KWin::Client::caption (this=0x94741a8, full=true) at ../../kwin/client.cpp:1855
#11 0x00433311 in KWin::Workspace::groupTabPopupAboutToShow (this=0x89cc200) at ../../kwin/useractions.cpp:448
#12 0x003c8aa1 in KWin::Workspace::qt_metacall (this=0x89cc200, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbfcd8d6c) at ./workspace.moc:580
#13 0x0277ac5a in QMetaObject::metacall (object=0x89cc200, cl=QMetaObject::InvokeMetaMethod, idx=171, argv=0xbfcd8d6c) at kernel/qmetaobject.cpp:237
#14 0x0278a9bf in QMetaObject::activate (sender=0x95347f8, m=0x72cb328, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3280
#15 0x06e20747 in QMenu::aboutToShow (this=0x95347f8) at .moc/release-shared/moc_qmenu.cpp:151
#16 0x06e23cf7 in QMenu::popup (this=0x95347f8, p=..., atAction=0x0) at widgets/qmenu.cpp:1814
#17 0x06e2681d in QMenu::internalDelayedPopup (this=0x9647a30) at widgets/qmenu.cpp:3006
#18 0x06e26d56 in QMenu::timerEvent (this=0x9647a30, e=0xbfcd969c) at widgets/qmenu.cpp:2846
#19 0x027896d4 in QObject::event (this=0x9647a30, e=0xbfcd969c) at kernel/qobject.cpp:1183
#20 0x069ef062 in QWidget::event (this=0x9647a30, event=0xbfcd969c) at kernel/qwidget.cpp:8659
#21 0x06e286e7 in QMenu::event (this=0x9647a30, e=0xbfcd969c) at widgets/qmenu.cpp:2410
#22 0x069975a4 in QApplicationPrivate::notify_helper (this=0x88e32b0, receiver=0x9647a30, e=0xbfcd969c) at kernel/qapplication.cpp:4445
#23 0x0699c15b in QApplication::notify (this=0xbfcdaac4, receiver=0x9647a30, e=0xbfcd969c) at kernel/qapplication.cpp:4410
#24 0x009522da in KApplication::notify (this=0xbfcdaac4, receiver=0x9647a30, event=0xbfcd969c) at ../../kdeui/kernel/kapplication.cpp:311
#25 0x003e532f in KWin::Application::notify (this=0xbfcdaac4, o=0x9647a30, e=0xbfcd969c) at ../../kwin/main.cpp:376
#26 0x0277467b in QCoreApplication::notifyInternal (this=0xbfcdaac4, receiver=0x9647a30, event=0xbfcd969c) at kernel/qcoreapplication.cpp:732
#27 0x027a46b9 in sendEvent (this=0x88e3a68) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#28 QTimerInfoList::activateTimers (this=0x88e3a68) at kernel/qeventdispatcher_unix.cpp:603
#29 0x027a4818 in QEventDispatcherUNIX::processEvents (this=0x88c5480, flags=...) at kernel/qeventdispatcher_unix.cpp:922
#30 0x06a4a93a in QEventDispatcherX11::processEvents (this=0x88c5480, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#31 0x02773859 in QEventLoop::processEvents (this=0xbfcd9900, flags=...) at kernel/qeventloop.cpp:149
#32 0x02773af2 in QEventLoop::exec (this=0xbfcd9900, flags=...) at kernel/qeventloop.cpp:201
#33 0x06e247c1 in QMenu::exec (this=0x9647a30, p=..., action=0x0) at widgets/qmenu.cpp:2054
#34 0x00434667 in KWin::Workspace::showWindowMenu (this=0x89cc200, pos=..., cl=0x9dd2a98) at ../../kwin/useractions.cpp:1738
#35 0x00418e8e in KWin::Bridge::showWindowMenu (this=0x951ff30, p=...) at ../../kwin/bridge.cpp:102
#36 0x00169c2b in KDecoration::showWindowMenu (this=0x9e12750, pos=...) at ../../../kwin/lib/kdecoration.cpp:205
#37 0x00170b07 in KCommonDecoration::showWindowMenu (this=0x9476ae0, pos=...) at ../../../kwin/lib/kcommondecoration.cpp:1124
#38 0x001728e8 in KCommonDecoration::menuButtonPressed (this=0x9476ae0) at ../../../kwin/lib/kcommondecoration.cpp:717
#39 0x00172b1e in KCommonDecoration::qt_metacall (this=0x9476ae0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbfcd9bfc) at ./kcommondecoration.moc:118
#40 0x00172c92 in KCommonDecorationUnstable::qt_metacall (this=0x9476ae0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbfcd9bfc) at ./kcommondecoration.moc:197
#41 0x07ffee7a in Oxygen::Client::qt_metacall (this=0x9476ae0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbfcd9bfc) at ./oxygenclient.moc:79
#42 0x0277ac5a in QMetaObject::metacall (object=0x9476ae0, cl=QMetaObject::InvokeMetaMethod, idx=12, argv=0xbfcd9bfc) at kernel/qmetaobject.cpp:237
#43 0x0278a9bf in QMetaObject::activate (sender=0x95d7280, m=0x72d7884, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3280
#44 0x0707d7c7 in QAbstractButton::pressed (this=0x95d7280) at .moc/release-shared/moc_qabstractbutton.cpp:193
#45 0x06d96906 in QAbstractButtonPrivate::emitPressed (this=0x967e6a8) at widgets/qabstractbutton.cpp:560
#46 0x06d9757e in QAbstractButton::mousePressEvent (this=0x95d7280, e=0xbfcd9ce0) at widgets/qabstractbutton.cpp:1096
#47 0x0016f613 in KCommonDecorationButton::mousePressEvent (this=0x95d7280, e=0xbfcda3b4) at ../../../kwin/lib/kcommondecoration.cpp:1019
#48 0x07ff5148 in Oxygen::Button::mousePressEvent (this=0x95d7280, e=0xbfcda3b4) at ../../../../kwin/clients/oxygen/oxygenbutton.cpp:156
#49 0x069ef7ec in QWidget::event (this=0x95d7280, event=0xbfcda3b4) at kernel/qwidget.cpp:8196
#50 0x06d973ce in QAbstractButton::event (this=0x95d7280, e=0xbfcda3b4) at widgets/qabstractbutton.cpp:1080
#51 0x069975a4 in QApplicationPrivate::notify_helper (this=0x88e32b0, receiver=0x95d7280, e=0xbfcda3b4) at kernel/qapplication.cpp:4445
#52 0x0699c9e1 in QApplication::notify (this=0xbfcdaac4, receiver=0x95d7280, e=0xbfcda3b4) at kernel/qapplication.cpp:4006
#53 0x009522da in KApplication::notify (this=0xbfcdaac4, receiver=0x95d7280, event=0xbfcda3b4) at ../../kdeui/kernel/kapplication.cpp:311
#54 0x003e532f in KWin::Application::notify (this=0xbfcdaac4, o=0x95d7280, e=0xbfcda3b4) at ../../kwin/main.cpp:376
#55 0x0277467b in QCoreApplication::notifyInternal (this=0xbfcdaac4, receiver=0x95d7280, event=0xbfcda3b4) at kernel/qcoreapplication.cpp:732
#56 0x069984bb in sendSpontaneousEvent (receiver=0x95d7280, event=0xbfcda3b4, alienWidget=0x0, nativeWidget=0x95d7280, buttonDown=0x72e0c40, lastMouseReceiver=..., spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#57 QApplicationPrivate::sendMouseEvent (receiver=0x95d7280, event=0xbfcda3b4, alienWidget=0x0, nativeWidget=0x95d7280, buttonDown=0x72e0c40, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3103
#58 0x06a20214 in QETWidget::translateMouseEvent (this=0x95d7280, event=0xbfcda8dc) at kernel/qapplication_x11.cpp:4438
#59 0x06a1e677 in QApplication::x11ProcessEvent (this=0xbfcdaac4, event=0xbfcda8dc) at kernel/qapplication_x11.cpp:3564
#60 0x06a4a830 in QEventDispatcherX11::processEvents (this=0x88c5480, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#61 0x02773859 in QEventLoop::processEvents (this=0xbfcdaa04, flags=...) at kernel/qeventloop.cpp:149
#62 0x02773af2 in QEventLoop::exec (this=0xbfcdaa04, flags=...) at kernel/qeventloop.cpp:201
#63 0x0277848c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#64 0x06995437 in QApplication::exec () at kernel/qapplication.cpp:3719
#65 0x003e7e22 in kdemain (argc=2, argv=0xbfcdad44) at ../../kwin/main.cpp:542
#66 0x080485bb in main (argc=2, argv=0xbfcdad44) at kwin_dummy.cpp:3

This bug may be a duplicate of or related to bug 230000.

Possible duplicates by query: bug 262340, bug 257697, bug 257390, bug 253841, bug 248935.

Reported using DrKonqi