Bug 397928

Application: kwin_x11 (5.13.4)

Qt Version: 5.11.1
Frameworks Version: 5.49.0
Operating System: Linux 4.18.5-arch1-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
SYSTEM:   ARCH LINUX

"KWIN"

- What I was doing when the application crashed:
> Firefox and Spotify (AUR) was open
> It makes when I run twice or triple time "hot corner" (on up left edge) in the same time
> Usually crashed on new session, sometimes twice on the same session
> When Firefox, Spotify and more programs are open, kwin newer crash.

- Unusual behavior I noticed:
> With crashed aplications dissapear for split second


ANOTHER MY ERRORS WCHICH I NOTICE ON KDE


"AKREGATOR"
> Everytime, when I open articles in new tabs, then I "close current tab" with cross on the right and then I click on chanel table "Akregator" close the program.


"KWIN ONECE AGAIN"
1) Open many programs 
2) Run left "hot corner" 
3) Close all programs and leave one open.
4) When only one program is open you are not switched automaticly to your panel and program window, but you have to click anywhere  to be switched.
It looks very not natural and it should be reported as bug i think

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd682fb86c0 (LWP 618))]

Thread 6 (Thread 0x7fd67b19b700 (LWP 2585)):
#0  0x00007fd6921a3ca6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fd69078937b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fd69078a86b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fd690738dac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fd690581f59 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fd68c3fd0d9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007fd69058c005 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fd68d1c2a9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fd6921aea43 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fd6659f9700 (LWP 698)):
#0  0x00007fd68d1c8afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fd68f8a4aac in  () at /usr/lib/libQt5Script.so.5
#2  0x00007fd68f8a4ac9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007fd68d1c2a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fd6921aea43 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fd6669fb700 (LWP 691)):
#0  0x00007fd68d1c8afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fd667484264 in  () at /usr/lib/dri/i965_dri.so
#2  0x00007fd667483f58 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007fd68d1c2a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fd6921aea43 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fd67a772700 (LWP 689)):
#0  0x00007fd6921a3ca6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fd69078937b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fd69078a86b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fd690738dac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fd690581f59 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fd68c3fd0d9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007fd69058c005 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fd68d1c2a9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fd6921aea43 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fd6809b3700 (LWP 671)):
#0  0x00007fd6921a3ca6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fd69078937b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fd69078a86b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fd690738dac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fd690581f59 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fd68bed9ba6 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007fd69058c005 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fd68d1c2a9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fd6921aea43 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fd682fb86c0 (LWP 618)):
[KCrash Handler]
#6  0x00005651c27510c0 in  ()
#7  0x00007fd691cc9179 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#8  0x00007fd690737bcf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#9  0x00007fd682b37612 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#10 0x00007fd682b381fd in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#11 0x00007fd690764832 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007fd6910b4e14 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007fd6910bc6e1 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007fd69073a119 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#15 0x00007fd69073d1ac in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#16 0x00007fd69078a6dd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#17 0x00007fd682bcb5ce in  () at /usr/lib/libQt5XcbQpa.so.5
#18 0x00007fd690738dac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007fd6907410a6 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#20 0x00007fd69227fb56 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#21 0x00007fd6920d7223 in __libc_start_main () at /usr/lib/libc.so.6
#22 0x00005651bfa4d75a in _start ()

Reported using DrKonqi