Application: kdeinit5 ()

Qt Version: 5.5.0
Operating System: Linux 4.1.6-1-ck x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Uploading a picture to google Photos in Firefox (40)
Opening the same in gwenview after that

- Unusual behavior I noticed:
System slow down / sluggish before crash

The crash can be reproduced sometimes.

-- Backtrace:
Application: kdeinit5 (kdeinit5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3fd59b17c0 (LWP 842))]

Thread 4 (Thread 0x7f3fbf9e0700 (LWP 845)):
#0  0x00007f3fd3d8e18d in poll () from /usr/lib/libc.so.6
#1  0x00007f3fd32819f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f3fd328356f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f3fc10fbca9 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f3fd410ca9e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f3fd17664a4 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f3fd3d9712d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f3fb306b700 (LWP 859)):
#0  0x00007f3fd0a3abab in g_main_context_acquire () from /usr/lib/libglib-2.0.so.0
#1  0x00007f3fd0a3bb35 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f3fd0a3bd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f3fd434425b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f3fd42eb26a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f3fd4107af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f3fb65a7a47 in KCupsConnection::run() () from /usr/lib/libkcupslib.so
#7  0x00007f3fd410ca9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f3fd17664a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f3fd3d9712d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f3fb286a700 (LWP 860)):
#0  0x00007fffe85a4c66 in clock_gettime ()
#1  0x00007f3fd3da3d26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007f3fd41bd236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007f3fd4341ce9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007f3fd4342255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007f3fd434363e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007f3fd0a3b1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007f3fd0a3bba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007f3fd0a3bd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007f3fd434425b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007f3fd42eb26a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007f3fd4107af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007f3fd410ca9e in ?? () from /usr/lib/libQt5Core.so.5
#13 0x00007f3fd17664a4 in start_thread () from /usr/lib/libpthread.so.0
#14 0x00007f3fd3d9712d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f3fd59b17c0 (LWP 842)):
[KCrash Handler]
#5  0x00007f3fc1114bbf in QXcbWindow::handleClientMessageEvent(xcb_client_message_event_t const*) () from /usr/lib/libQt5XcbQpa.so.5
#6  0x00007f3fc10ffddb in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/libQt5XcbQpa.so.5
#7  0x00007f3fc1100303 in QXcbConnection::processXcbEvents() () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007f3fd431ceb1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#9  0x00007f3fd293b00c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#10 0x00007f3fd29404e6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#11 0x00007f3fd42ed89b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#12 0x00007f3fd42efc96 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#13 0x00007f3fd4343e33 in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007f3fd0a3b9fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#15 0x00007f3fd0a3bce0 in ?? () from /usr/lib/libglib-2.0.so.0
#16 0x00007f3fd0a3bd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#17 0x00007f3fd434423f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#18 0x00007f3fd42eb26a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#19 0x00007f3fd42f320c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#20 0x00007f3fc15bbb64 in kdemain () from /usr/lib/libkdeinit5_kded5.so
#21 0x000000000040856a in ?? ()
#22 0x000000000040585f in main ()

Reported using DrKonqi