Application: plasmashell (5.4.0)

Qt Version: 5.5.0
Operating System: Linux 4.1.6-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
Nothing particular. Plasmashell is slow at the beginning of each sessions.
- Unusual behavior I noticed:
Plasmashell uses 100% CPU time since a few days, resulting in plasma's widgets responding really slowly (like several minutes for each actions/notifications/...).

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f25a4162800 (LWP 2294))]

Thread 7 (Thread 0x7f258d179700 (LWP 2295)):
#0  0x00007f259d65518d in poll () from /usr/lib/libc.so.6
#1  0x00007f25a26539f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f25a265556f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f258e894ca9 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f259dd55a9e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f259ce5d4a4 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f259d65e12d in clone () from /usr/lib/libc.so.6

Thread 6 (Thread 0x7f2586419700 (LWP 2303)):
#0  0x00007f259d65518d in poll () from /usr/lib/libc.so.6
#1  0x00007f2599b04c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f2599b04d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f259df8d25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f259df3426a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f259dd50af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f25a10d1335 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007f259dd55a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f259ce5d4a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f259d65e12d in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7f257ae9d700 (LWP 2330)):
#0  0x00007f259d65116d in read () from /usr/lib/libc.so.6
#1  0x00007f2599b47f60 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f2599b0472c in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#3  0x00007f2599b04c20 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007f2599b04d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#5  0x00007f259df8d25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007f259df3426a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#7  0x00007f259dd50af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#8  0x00007f25a10d1335 in ?? () from /usr/lib/libQt5Qml.so.5
#9  0x00007f259dd55a9e in ?? () from /usr/lib/libQt5Core.so.5
#10 0x00007f259ce5d4a4 in start_thread () from /usr/lib/libpthread.so.0
#11 0x00007f259d65e12d in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7f25791b0700 (LWP 2333)):
#0  0x00007f259d65518d in poll () from /usr/lib/libc.so.6
#1  0x00007f2599b04c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f2599b04d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f259df8d25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f259df3426a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f259dd50af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f25a10d1335 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007f259dd55a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f259ce5d4a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f259d65e12d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f25737b9700 (LWP 2347)):
#0  0x00007f259ce6307f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f25a38ee564 in ?? () from /usr/lib/libQt5Script.so.5
#2  0x00007f25a38ee5a9 in ?? () from /usr/lib/libQt5Script.so.5
#3  0x00007f259ce5d4a4 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f259d65e12d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f2570c42700 (LWP 2390)):
#0  0x00007f259df8c6c0 in ?? () from /usr/lib/libQt5Core.so.5
#1  0x00007f2599b04681 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#2  0x00007f2599b04c20 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007f2599b04d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#4  0x00007f259df8d25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f259df3426a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007f259dd50af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#7  0x00007f25a1c881f6 in ?? () from /usr/lib/libQt5Quick.so.5
#8  0x00007f259dd55a9e in ?? () from /usr/lib/libQt5Core.so.5
#9  0x00007f259ce5d4a4 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007f259d65e12d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f25a4162800 (LWP 2294)):
[KCrash Handler]
#5  0x00007f258e8a56ec in QXcbScreen::mapFromNative(QPoint const&) const () from /usr/lib/libQt5XcbQpa.so.5
#6  0x00007f258e8accfd in QXcbWindow::handleButtonPressEvent(int, int, int, int, int, QFlags<Qt::KeyboardModifier>, unsigned int) () from /usr/lib/libQt5XcbQpa.so.5
#7  0x00007f258e8ad26a in QXcbWindow::handleXIMouseEvent(xcb_ge_event_t*) () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007f258e8c0269 in QXcbConnection::xi2HandleEvent(xcb_ge_event_t*) () from /usr/lib/libQt5XcbQpa.so.5
#9  0x00007f258e898e65 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/libQt5XcbQpa.so.5
#10 0x00007f258e899303 in QXcbConnection::processXcbEvents() () from /usr/lib/libQt5XcbQpa.so.5
#11 0x00007f259df65eb1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#12 0x00007f259f30500c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#13 0x00007f259f30a4e6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007f259df3689b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#15 0x00007f259df38c96 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#16 0x00007f259df8ce33 in ?? () from /usr/lib/libQt5Core.so.5
#17 0x00007f2599b049fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007f2599b04ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007f2599b04d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007f259df8d23f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#21 0x00007f259df3426a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#22 0x00007f259df3c20c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#23 0x000000000042fe93 in main ()

Reported using DrKonqi