Bug 375816

Application: kwin_x11 (5.8.5)

Qt Version: 5.8.0
Frameworks Version: 5.30.0
Operating System: Linux 4.9.6-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Starting Plasma. Mumble is in the autostart list
- Unusual behavior I noticed:
I was not able to show the window of Mumble by clicking the tray icon
This worked on other apps with tray icon

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 0x7f0d95caf840 (LWP 1901))]

Thread 6 (Thread 0x7f0d57d76700 (LWP 2003)):
#0  0x00007f0d8e95b10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f0d91cd1234 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f0d91cd1279 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f0d8e955454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f0d956ea7df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f0d62f76700 (LWP 1995)):
#0  0x00007f0d956e1551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f0d92d8a6f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f0d92d8bd6a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f0d92d38c9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f0d92b5aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f0d8d660025 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f0d92b5f6d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f0d8e955454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f0d956ea7df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f0d6bb35700 (LWP 1980)):
#0  0x00007f0d956e1551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f0d92d8a6f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f0d92d8bd6a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f0d92d38c9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f0d92b5aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f0d8d660025 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f0d92b5f6d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f0d8e955454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f0d956ea7df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f0d7a32a700 (LWP 1935)):
#0  0x00007f0d956e1551 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f0d92d8a6f9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f0d92d8bd6a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f0d92d38c9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f0d92b5aa73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f0d8c818125 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f0d92b5f6d8 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f0d8e955454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f0d956ea7df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f0d7c451700 (LWP 1913)):
#0  0x00007f0d956e148d in poll () at /usr/lib/libc.so.6
#1  0x00007f0d948218e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f0d94823679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f0d7d52d239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f0d92b5f6d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f0d8e955454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f0d956ea7df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f0d95caf840 (LWP 1901)):
[KCrash Handler]
#6  0x00000000020b9f00 in  ()
#7  0x00007f0d92d6c7f0 in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () at /usr/lib/libQt5Core.so.5
#8  0x00007f0d91d1376f in  () at /usr/lib/libQt5Script.so.5
#9  0x00007f0d91d13844 in  () at /usr/lib/libQt5Script.so.5
#10 0x00007f0d91d13ac2 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () at /usr/lib/libQt5Script.so.5
#11 0x00007f0d952ec19c in  () at /usr/lib/libkwin.so.5
#12 0x00007f0d91d13d75 in  () at /usr/lib/libQt5Script.so.5
#13 0x00007f0d91d3c826 in  () at /usr/lib/libQt5Script.so.5
#14 0x00007f0d91d44af1 in  () at /usr/lib/libQt5Script.so.5
#15 0x00007f0d92d662e4 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#16 0x00007f0d9251aee8 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () at /usr/lib/libkwineffects.so.9
#17 0x00007f0d9251c8a1 in  () at /usr/lib/libkwineffects.so.9
#18 0x00007f0d92d66fa9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#19 0x00007f0d93a1c34c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007f0d93a23b61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#21 0x00007f0d92d3a840 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#22 0x00007f0d92d3cfcd in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#23 0x00007f0d92d8bb97 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#24 0x00007f0d7d58dded in  () at /usr/lib/libQt5XcbQpa.so.5
#25 0x00007f0d92d38c9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#26 0x00007f0d92d411e4 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#27 0x00007f0d959a9455 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#28 0x00007f0d95622291 in __libc_start_main () at /usr/lib/libc.so.6
#29 0x000000000040069a in _start ()

Reported using DrKonqi