Application: kwin_x11 (5.4.3)

Qt Version: 5.5.1
Operating System: Linux 4.2.6-300.fc23.x86_64 x86_64
Distribution: "Fedora release 23 (Twenty Three)"

-- Information about the crash:
- What I was doing when the application crashed:
Quitting VLC after watch a video

My monitor is plugged on a KVM (Belkin Soho 4xDVI-DL) when switching screen to another computer and switching back KDE would crash but restart, this must have put KDE on a setting so that KDE would crash upon quitting VLC.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe5b8671940 (LWP 2472))]

Thread 4 (Thread 0x7fe594d69700 (LWP 2560)):
#0  0x00007fe5ad821fdd in poll () at /lib64/libc.so.6
#1  0x00007fe5ae892272 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007fe5ae893ee7 in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007fe595839da9 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007fe5aeb4d3ce in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007fe5b111760a in start_thread () at /lib64/libpthread.so.0
#6  0x00007fe5ad82da7d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7fe58d8c6700 (LWP 2582)):
#0  0x00007fe5ad823d63 in select () at /lib64/libc.so.6
#1  0x00007fe5aed8057f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () at /lib64/libQt5Core.so.5
#2  0x00007fe5aed8207e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () at /lib64/libQt5Core.so.5
#3  0x00007fe5aed825ae in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007fe5aed2bf0a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007fe5aeb48424 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007fe5b5e62b45 in QQmlThreadPrivate::run() () at /lib64/libQt5Qml.so.5
#7  0x00007fe5aeb4d3ce in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007fe5b111760a in start_thread () at /lib64/libpthread.so.0
#9  0x00007fe5ad82da7d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fe5877fe700 (LWP 2641)):
#0  0x00007fe5b111cb10 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fe5b7476514 in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5Script.so.5
#2  0x00007fe5b7476559 in  () at /lib64/libQt5Script.so.5
#3  0x00007fe5b111760a in start_thread () at /lib64/libpthread.so.0
#4  0x00007fe5ad82da7d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fe5b8671940 (LWP 2472)):
[KCrash Handler]
#5  0x00007fe59585285f in QXcbWindow::handleClientMessageEvent(xcb_client_message_event_t const*) () at /lib64/libQt5XcbQpa.so.5
#6  0x00007fe59583bdcb in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /lib64/libQt5XcbQpa.so.5
#7  0x00007fe59583c433 in QXcbConnection::processXcbEvents() () at /lib64/libQt5XcbQpa.so.5
#8  0x00007fe5aed5e1b1 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#9  0x00007fe5afa1441c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#10 0x00007fe5afa198e6 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#11 0x00007fe5aed2e77b in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#12 0x00007fe5aed30b76 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#13 0x00007fe5aed82472 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#14 0x00007fe5958a095d in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5XcbQpa.so.5
#15 0x00007fe5aed2bf0a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#16 0x00007fe5aed33fec in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#17 0x00007fe5b8375b93 in kdemain () at /lib64/libkdeinit5_kwin_x11.so
#18 0x00007fe5ad74b580 in __libc_start_main () at /lib64/libc.so.6
#19 0x0000562d18978d89 in _start ()

Possible duplicates by query: bug 355566, bug 355221, bug 353563.

Reported using DrKonqi