https://bugs.kde.org/show_bug.cgi?id=409715

            Bug ID: 409715
           Summary: KWin crash
           Product: kwin
           Version: 5.16.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: szymondud...@gmail.com
  Target Milestone: ---

Application: kwin_x11 (5.16.3)

Qt Version: 5.13.0
Frameworks Version: 5.59.0
Operating System: Linux 5.2.0-arch2-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
After Alt + Tab ->  Show All Applications . KWin crashing sometimes in this
combination.

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 0x7f5aa6675880 (LWP 1247))]

Thread 7 (Thread 0x7f59fbfff700 (LWP 7179)):
#0  0x00007f5aa8499756 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f5aa6fbb913 in qt_safe_poll(pollfd*, unsigned long, timespec const*)
() at /usr/lib/libQt5Core.so.5
#2  0x00007f5aa6fbcfa3 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#3  0x00007f5aa6f665ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#4  0x00007f5aa6d992f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5aa54288f9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f5aa6d9a520 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5aa5ca957f in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f5aa84a40e3 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f5a87e7f700 (LWP 4490)):
#0  0x00007f5aa8499756 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f5aa6fbb913 in qt_safe_poll(pollfd*, unsigned long, timespec const*)
() at /usr/lib/libQt5Core.so.5
#2  0x00007f5aa6fbcfa3 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#3  0x00007f5aa6f665ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#4  0x00007f5aa6d992f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5aa6d9a520 in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5aa5ca957f in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5aa84a40e3 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f5a9cfb7700 (LWP 2940)):
#0  0x00007f5aa5caf415 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007f5aa6da05a0 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at
/usr/lib/libQt5Core.so.5
#2  0x00007f5aa6da0692 in QWaitCondition::wait(QMutex*, unsigned long) () at
/usr/lib/libQt5Core.so.5
#3  0x00007f5aa57c77bd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5aa57c7a6e in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5aa6d9a520 in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5aa5ca957f in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5aa84a40e3 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f5a8767e700 (LWP 1441)):
#0  0x00007f5aa5caf415 in pthread_cond_wait@@GLIBC_2.3.2 () at
/usr/lib/libpthread.so.0
#1  0x00007f5aa6808edc in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f5aa6808ef9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f5aa5ca957f in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5aa84a40e3 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f5a8ffff700 (LWP 1361)):
#0  0x00007f5aa8499756 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f5aa6fbb913 in qt_safe_poll(pollfd*, unsigned long, timespec const*)
() at /usr/lib/libQt5Core.so.5
#2  0x00007f5aa6fbcfa3 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#3  0x00007f5aa6f665ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#4  0x00007f5aa6d992f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5aa54288f9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f5aa6d9a520 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5aa5ca957f in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f5aa84a40e3 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f5a9e1cf700 (LWP 1309)):
#0  0x00007f5aa8499756 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f5aa6fbb913 in qt_safe_poll(pollfd*, unsigned long, timespec const*)
() at /usr/lib/libQt5Core.so.5
#2  0x00007f5aa6fbcfa3 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#3  0x00007f5aa6f665ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#4  0x00007f5aa6d992f5 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5aa4e45b37 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f5aa6d9a520 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5aa5ca957f in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f5aa84a40e3 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f5aa6675880 (LWP 1247)):
[KCrash Handler]
#6  0x000055eb170c6630 in  ()
#7  0x00007f5aa81b0d22 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*)
() at /usr/lib/libkwin.so.5
#8  0x00007f5aa6f65457 in
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) ()
at /usr/lib/libQt5Core.so.5
#9  0x00007f5a9f5b1e43 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() at /usr/lib/libQt5XcbQpa.so.5
#10 0x00007f5a9f5b2bc9 in
QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5XcbQpa.so.5
#11 0x00007f5a9f5dc3ae in  () at /usr/lib/libQt5XcbQpa.so.5
#12 0x00007f5aa6f665ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#13 0x00007f5aa6f6e326 in QCoreApplication::exec() () at
/usr/lib/libQt5Core.so.5
#14 0x00007f5aa8579588 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#15 0x00007f5aa83ceee3 in __libc_start_main () at /usr/lib/libc.so.6
#16 0x000055eb163dd05e in _start ()
[Inferior 1 (process 1247) detached]

Reported using DrKonqi

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