Application: kwin (4.11.9)
KDE Platform Version: 4.13.0
Qt Version: 4.8.6
Operating System: Linux 3.13.0-24-generic x86_64
Distribution: Ubuntu 14.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
I was trying to move a window into a tab group. I right-clicked the title bar, and when I hovered over the "Attach as tab to" entry, KWin crashed.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f74899b2800 (LWP 4162))]

Thread 3 (Thread 0x7f7469e2a700 (LWP 4172)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7488379ffb in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f748837a039 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f7480f1f182 in start_thread (arg=0x7f7469e2a700) at pthread_create.c:312
#4  0x00007f748918b30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f746a946700 (LWP 6065)):
#0  0x00007f7489182c33 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f74835742c7 in qt_safe_select (nfds=13, fdread=0x7f745c000ac8, fdwrite=0x7f745c000d60, fdexcept=0x7f745c000ff8, orig_timeout=0x0) at kernel/qcore_unix.cpp:79
#2  0x00007f7483579824 in QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7f745c000910, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:223
#3  0x00007f7483579c92 in QEventDispatcherUNIX::processEvents (this=0x7f745c0008f0, flags=...) at kernel/qeventdispatcher_unix.cpp:936
#4  0x00007f74835480af in QEventLoop::processEvents (this=this@entry=0x7f746a945da0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f74835483a5 in QEventLoop::exec (this=this@entry=0x7f746a945da0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f7483444c5f in QThread::exec (this=this@entry=0x24a15e0) at thread/qthread.cpp:537
#7  0x00007f7483529823 in QInotifyFileSystemWatcherEngine::run (this=0x24a15e0) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f748344732f in QThreadPrivate::start (arg=0x24a15e0) at thread/qthread_unix.cpp:349
#9  0x00007f7480f1f182 in start_thread (arg=0x7f746a946700) at pthread_create.c:312
#10 0x00007f748918b30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f74899b2800 (LWP 4162)):
[KCrash Handler]
#6  begin (this=0x88) at ../../include/QtCore/../../src/corelib/tools/qlist.h:101
#7  contains (t=@0x7fff147dcd58: 0x26c6690, this=0x88) at ../../include/QtCore/../../src/corelib/tools/qlist.h:882
#8  QActionGroup::addAction (this=0x27ca8b0, a=a@entry=0x26c6690) at kernel/qactiongroup.cpp:180
#9  0x00007f74894f7e9c in KWin::UserActionsMenu::activityPopupAboutToShow (this=0x2109c30) at ../../kwin/useractions.cpp:723
#10 0x00007f748355d87a in QMetaObject::activate (sender=sender@entry=0x35a1680, m=m@entry=0x7f748339c340 <QMenu::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#11 0x00007f7482d0c1c0 in QMenu::aboutToShow (this=this@entry=0x35a1680) at .moc/release-shared/moc_qmenu.cpp:164
#12 0x00007f7482d0f0bd in QMenu::popup (this=0x35a1680, p=..., atAction=atAction@entry=0x0) at widgets/qmenu.cpp:1844
#13 0x00007f7482d106fb in QMenu::internalDelayedPopup (this=this@entry=0x32bb500) at widgets/qmenu.cpp:3057
#14 0x00007f7482d12174 in QMenu::timerEvent (this=0x32bb500, e=<optimized out>) at widgets/qmenu.cpp:2917
#15 0x00007f7483561a31 in QObject::event (this=this@entry=0x32bb500, e=e@entry=0x7fff147dd5d0) at kernel/qobject.cpp:1156
#16 0x00007f748293255b in QWidget::event (this=this@entry=0x32bb500, event=event@entry=0x7fff147dd5d0) at kernel/qwidget.cpp:8846
#17 0x00007f7482d147bb in QMenu::event (this=0x32bb500, e=0x7fff147dd5d0) at widgets/qmenu.cpp:2481
#18 0x00007f74828e2e2c in QApplicationPrivate::notify_helper (this=this@entry=0x1f2bf50, receiver=receiver@entry=0x32bb500, e=e@entry=0x7fff147dd5d0) at kernel/qapplication.cpp:4567
#19 0x00007f74828e94a0 in QApplication::notify (this=this@entry=0x7fff147de610, receiver=receiver@entry=0x32bb500, e=e@entry=0x7fff147dd5d0) at kernel/qapplication.cpp:4353
#20 0x00007f7487dcebaa in KApplication::notify (this=0x7fff147de610, receiver=0x32bb500, event=0x7fff147dd5d0) at ../../kdeui/kernel/kapplication.cpp:311
#21 0x00007f74835494dd in QCoreApplication::notifyInternal (this=0x7fff147de610, receiver=0x32bb500, event=0x7fff147dd5d0) at kernel/qcoreapplication.cpp:953
#22 0x00007f7483579323 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#23 QTimerInfoList::activateTimers (this=0x1f2cbc8) at kernel/qeventdispatcher_unix.cpp:621
#24 0x00007f74835793a0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x1eb0af0) at kernel/qeventdispatcher_unix.cpp:878
#25 0x00007f7483579d20 in QEventDispatcherUNIX::processEvents (this=this@entry=0x1eb0af0, flags=...) at kernel/qeventdispatcher_unix.cpp:940
#26 0x00007f74829854d6 in QEventDispatcherX11::processEvents (this=0x1eb0af0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#27 0x00007f74835480af in QEventLoop::processEvents (this=this@entry=0x7fff147dd920, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f74835483a5 in QEventLoop::exec (this=this@entry=0x7fff147dd920, flags=...) at kernel/qeventloop.cpp:204
#29 0x00007f7482d13587 in QMenu::exec (this=0x32bb500, p=..., action=action@entry=0x0) at widgets/qmenu.cpp:2125
#30 0x00007f74894f478a in KWin::UserActionsMenu::show (this=0x2109c30, pos=..., cl=...) at ../../kwin/useractions.cpp:167
#31 0x00007f74894f484b in KWin::Workspace::showWindowMenu (this=0x2120e00, pos=..., cl=0x27e3b50) at ../../kwin/useractions.cpp:1827
#32 0x00007f74894e8fc2 in KWin::Bridge::showWindowMenu (this=0x27e2950, p=..., id=<optimized out>) at ../../kwin/bridge.cpp:110
#33 0x00007f746a95665e in Oxygen::Client::mousePressEvent (this=0x2738ec0, event=0x7fff147dde90) at ../../../../kwin/clients/oxygen/oxygenclient.cpp:1669
#34 0x00007f746a95fbda in Oxygen::Client::eventFilter (this=0x2738ec0, object=0x3201690, event=0x7fff147dde90) at ../../../../kwin/clients/oxygen/oxygenclient.cpp:1358
#35 0x00007f7483549646 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x1f2bf50, receiver=receiver@entry=0x3201690, event=event@entry=0x7fff147dde90) at kernel/qcoreapplication.cpp:1063
#36 0x00007f74828e2e0c in QApplicationPrivate::notify_helper (this=this@entry=0x1f2bf50, receiver=receiver@entry=0x3201690, e=e@entry=0x7fff147dde90) at kernel/qapplication.cpp:4563
#37 0x00007f74828e95dd in QApplication::notify (this=this@entry=0x7fff147de610, receiver=receiver@entry=0x3201690, e=e@entry=0x7fff147dde90) at kernel/qapplication.cpp:4110
#38 0x00007f7487dcebaa in KApplication::notify (this=0x7fff147de610, receiver=0x3201690, event=0x7fff147dde90) at ../../kdeui/kernel/kapplication.cpp:311
#39 0x00007f74835494dd in QCoreApplication::notifyInternal (this=0x7fff147de610, receiver=receiver@entry=0x3201690, event=event@entry=0x7fff147dde90) at kernel/qcoreapplication.cpp:953
#40 0x00007f74828e8d93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#41 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x3201690, event=event@entry=0x7fff147dde90, alienWidget=alienWidget@entry=0x0, nativeWidget=nativeWidget@entry=0x3201690, buttonDown=buttonDown@entry=0x7f74833c8318 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#42 0x00007f748295d9cb in QETWidget::translateMouseEvent (this=this@entry=0x3201690, event=event@entry=0x7fff147de220) at kernel/qapplication_x11.cpp:4634
#43 0x00007f748295d269 in QApplication::x11ProcessEvent (this=0x7fff147de610, event=event@entry=0x7fff147de220) at kernel/qapplication_x11.cpp:3627
#44 0x00007f7482985470 in QEventDispatcherX11::processEvents (this=0x1eb0af0, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#45 0x00007f74835480af in QEventLoop::processEvents (this=this@entry=0x7fff147de480, flags=...) at kernel/qeventloop.cpp:149
#46 0x00007f74835483a5 in QEventLoop::exec (this=this@entry=0x7fff147de480, flags=...) at kernel/qeventloop.cpp:204
#47 0x00007f748354db79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#48 0x00007f74828e137c in QApplication::exec () at kernel/qapplication.cpp:3828
#49 0x00007f74894d1906 in kdemain (argc=3, argv=0x7fff147de758) at ../../kwin/main.cpp:597
#50 0x00007f74890b1ec5 in __libc_start_main (main=0x4006d0 <main(int, char**)>, argc=3, argv=0x7fff147de758, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff147de748) at libc-start.c:287
#51 0x00000000004006fe in _start ()

Possible duplicates by query: bug 335244, bug 335215, bug 334539, bug 334152.

Reported using DrKonqi