Application: kwin_x11 (5.7.4)

Qt Version: 5.6.1
Frameworks Version: 5.25.0
Operating System: Linux 4.7.0-1-amd64 x86_64
Distribution: Debian GNU/Linux testing (stretch)

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

I closed a Citrix session, i.e. IcedTea running in Firefox.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1ec39c6940 (LWP 3246))]

Thread 4 (Thread 0x7f1eb98fa700 (LWP 3285)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f1ed8306574 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f1ed83065b9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f1ed4897464 in start_thread (arg=0x7f1eb98fa700) at pthread_create.c:333
#4  0x00007f1edb31797f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f1eba99b700 (LWP 3284)):
#0  0x00007f1edb32481f in __GI___clock_gettime (clock_id=1, tp=0x7f1eba99aa00) at ../sysdeps/unix/clock_gettime.c:115
#1  0x00007f1ed9018846 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f1ed91980c9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f1ed9197476 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f1ed9197cfa in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f1ed914219a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f1ed8f67e53 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f1ed39f5a55 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f1ed8f6cd78 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f1ed4897464 in start_thread (arg=0x7f1eba99b700) at pthread_create.c:333
#10 0x00007f1edb31797f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f1ec0f31700 (LWP 3258)):
#0  0x00007f1edb310253 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f1ed9195d3f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f1ed91977e4 in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f1ed9197cfa in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f1ed914219a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f1ed8f67e53 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f1edb90e525 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f1ed8f6cd78 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f1ed4897464 in start_thread (arg=0x7f1ec0f31700) at pthread_create.c:333
#9  0x00007f1edb31797f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f1ec39c6940 (LWP 3246)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007f1edae5a26d in KWin::Workspace::constrainedStackingOrder() () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#8  0x00007f1edae5aa06 in KWin::Workspace::updateStackingOrder(bool) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#9  0x00007f1edae5aff0 in KWin::Workspace::blockStackingUpdates(bool) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007f1edae1add6 in KWin::Client::destroyClient() () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007f1edae68c1a in KWin::Client::unmapNotifyEvent(xcb_unmap_notify_event_t*) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007f1edae6c1e3 in KWin::Client::windowEvent(xcb_generic_event_t*) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007f1edae6d63c in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00007f1ed91412df in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f1ec372c455 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#16 0x00007f1ec372d3eb in QXcbConnection::processXcbEvents() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#17 0x00007f1ed9172729 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f1ed9a80bec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f1ed9a8608f in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007f1ed9144450 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f1ed91463cc in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f1ed9197be2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f1ec379f0ad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#24 0x00007f1ed914219a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f1ed914a99c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f1edb5d6216 in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#27 0x00007f1edb24f2b1 in __libc_start_main (main=0x4006a0, argc=3, argv=0x7ffd8c907658, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd8c907648) at ../csu/libc-start.c:291
#28 0x00000000004006d9 in _start ()

Possible duplicates by query: bug 369318, bug 360135, bug 356616.

Reported using DrKonqi