Application: kwin_x11 (5.12.5)

Qt Version: 5.10.1
Frameworks Version: 5.46.0
Operating System: Linux 4.16.8-1-MANJARO x86_64
Distribution: "Manjaro Linux"

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

I simply closed a tab on Chromium. But it happens when closing another windows as well. Sometimes crashes, sometimes doesn't.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fdc4969f840 (LWP 934))]

Thread 5 (Thread 0x7fdc08c49700 (LWP 1528)):
#0  0x00007fdc4902cfa6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fdc4642bdb3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fdc4642d54f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fdc463d231b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fdc461e171e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fdc40b29319 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007fdc461e6abd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fdc4205c075 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fdc4903753f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fdc0ac8b700 (LWP 1060)):
#0  0x00007fdc42061ffc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fdc4531ef77 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007fdc4531efb9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007fdc4205c075 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fdc4903753f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fdc1b7fe700 (LWP 1056)):
#0  0x00007fdc4902cfb5 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fdc4642bdb3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fdc4642d54f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fdc463d231b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fdc461e171e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fdc40b29319 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007fdc461e6abd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fdc4205c075 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fdc4903753f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fdc2197f700 (LWP 1052)):
#0  0x00007fdc4902cfa6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fdc4642bdb3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fdc4642d54f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fdc463d231b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fdc461e171e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fdc3f9c8416 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007fdc461e6abd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fdc4205c075 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fdc4903753f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fdc4969f840 (LWP 934)):
[KCrash Handler]
#6  0x0000000000000000 in  ()
#7  0x00007fdc48b44c7d in KWin::Workspace::constrainedStackingOrder() () at /usr/lib/libkwin.so.5
#8  0x00007fdc48b45469 in KWin::Workspace::updateStackingOrder(bool) () at /usr/lib/libkwin.so.5
#9  0x00007fdc48b45a01 in KWin::Workspace::blockStackingUpdates(bool) () at /usr/lib/libkwin.so.5
#10 0x00007fdc48aefb6f in KWin::Client::destroyClient() () at /usr/lib/libkwin.so.5
#11 0x00007fdc48b50a1f in KWin::Client::unmapNotifyEvent(xcb_unmap_notify_event_t*) () at /usr/lib/libkwin.so.5
#12 0x00007fdc48b542cc in KWin::Client::windowEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#13 0x00007fdc48b54c9b in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#14 0x00007fdc463d0d4f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#15 0x00007fdc308b13f2 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#16 0x00007fdc308b207e in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#17 0x00007fdc46405052 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#18 0x00007fdc47151fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007fdc471599c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007fdc463d3ce0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#21 0x00007fdc463d6946 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#22 0x00007fdc4642d366 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#23 0x00007fdc3093771e in  () at /usr/lib/libQt5XcbQpa.so.5
#24 0x00007fdc463d231b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#25 0x00007fdc463db718 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#26 0x00007fdc49303416 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#27 0x00007fdc48f6206b in __libc_start_main () at /usr/lib/libc.so.6
#28 0x000055d07a71075a in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 391395.

Possible duplicates by query: bug 392412, bug 391395, bug 389201.

Reported using DrKonqi