Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-21-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:

After upgrade to Kubuntu 16.04, Plasma crashes on every attempt to login

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f0cdb5b68c0 (LWP 11784))]

Thread 7 (Thread 0x7f0cc780f700 (LWP 11787)):
#0  0x00007f0cd5cd4e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f0cd9d99c62 in poll (__timeout=-1, __nfds=1, __fds=0x7f0cc780ec00) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x22c3820, cond=cond@entry=0x22c3860, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007f0cd9d9b8d7 in xcb_wait_for_event (c=0x22c3820) at ../../src/xcb_in.c:693
#4  0x00007f0cc9f8f629 in QXcbEventReader::run (this=0x22cd370) at qxcbconnection.cpp:1253
#5  0x00007f0cd63ca84e in QThreadPrivate::start (arg=0x22cd370) at thread/qthread_unix.cpp:331
#6  0x00007f0cd54b76fa in start_thread (arg=0x7f0cc780f700) at pthread_create.c:333
#7  0x00007f0cd5ce0b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f0cb7690700 (LWP 11789)):
#0  0x00007f0cd2aaea64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f0cd2a69cda in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0cd2a6a2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0cd2a6a42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0cd6601a9b in QEventDispatcherGlib::processEvents (this=0x7f0cb00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f0cd65a8dea in QEventLoop::exec (this=this@entry=0x7f0cb768fce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f0cd63c58a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f0cd8c6d3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f0cd63ca84e in QThreadPrivate::start (arg=0x24bdb90) at thread/qthread_unix.cpp:331
#9  0x00007f0cd54b76fa in start_thread (arg=0x7f0cb7690700) at pthread_create.c:333
#10 0x00007f0cd5ce0b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f0cad14f700 (LWP 11790)):
#0  0x00007f0cd5cd4e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f0cd2a6a31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0cd2a6a42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0cd6601a9b in QEventDispatcherGlib::processEvents (this=0x7f0ca80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f0cd65a8dea in QEventLoop::exec (this=this@entry=0x7f0cad14ece0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f0cd63c58a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f0cd8c6d3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f0cd63ca84e in QThreadPrivate::start (arg=0x26bb190) at thread/qthread_unix.cpp:331
#8  0x00007f0cd54b76fa in start_thread (arg=0x7f0cad14f700) at pthread_create.c:333
#9  0x00007f0cd5ce0b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f0ca71d9700 (LWP 11791)):
#0  0x00007f0cd5ceefb6 in __GI___clock_gettime (clock_id=1, tp=tp@entry=0x7f0ca71d8a50) at ../sysdeps/unix/clock_gettime.c:115
#1  0x00007f0cd647ac16 in qt_clock_gettime (ts=0x7f0ca71d8a50, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#2  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#3  qt_gettime () at tools/qelapsedtimer_unix.cpp:165
#4  0x00007f0cd65ff529 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f0ca00013a0) at kernel/qtimerinfo_unix.cpp:84
#5  0x00007f0cd65ffa95 in QTimerInfoList::timerWait (this=0x7f0ca00013a0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#6  0x00007f0cd6600e7e in timerSourcePrepareHelper (timeout=0x7f0ca71d8b24, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#7  timerSourcePrepare (source=<optimized out>, timeout=0x7f0ca71d8b24) at kernel/qeventdispatcher_glib.cpp:160
#8  0x00007f0cd2a698ad in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f0cd2a6a24b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f0cd2a6a42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f0cd6601a9b in QEventDispatcherGlib::processEvents (this=0x7f0ca00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#12 0x00007f0cd65a8dea in QEventLoop::exec (this=this@entry=0x7f0ca71d8ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#13 0x00007f0cd63c58a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#14 0x00007f0cd8c6d3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007f0cd63ca84e in QThreadPrivate::start (arg=0x22af330) at thread/qthread_unix.cpp:331
#16 0x00007f0cd54b76fa in start_thread (arg=0x7f0ca71d9700) at pthread_create.c:333
#17 0x00007f0cd5ce0b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f0ca58b9700 (LWP 11792)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0cdb012bd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f0cdb012c19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f0cd54b76fa in start_thread (arg=0x7f0ca58b9700) at pthread_create.c:333
#4  0x00007f0cd5ce0b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f0c1df6d700 (LWP 11793)):
#0  0x00007f0cd5cd4e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f0cd2a6a31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0cd2a6a42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0cd6601a9b in QEventDispatcherGlib::processEvents (this=0x7f0c180008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f0cd65a8dea in QEventLoop::exec (this=this@entry=0x7f0c1df6cc90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f0cd63c58a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f0cd95f3ed6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f0cd63ca84e in QThreadPrivate::start (arg=0x2b5ca90) at thread/qthread_unix.cpp:331
#8  0x00007f0cd54b76fa in start_thread (arg=0x7f0c1df6d700) at pthread_create.c:333
#9  0x00007f0cd5ce0b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f0cdb5b68c0 (LWP 11784)):
[KCrash Handler]
#6  0x00007f0cd5c0f418 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
#7  0x00007f0cd5c1101a in __GI_abort () at abort.c:89
#8  0x00007f0cd63b7ff1 in qt_message_fatal (context=..., message=<synthetic pointer>) at global/qlogging.cpp:1578
#9  QMessageLogger::fatal (this=<optimized out>, msg=<optimized out>) at global/qlogging.cpp:781
#10 0x00007f0cd9660af1 in QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f0cd9661b05 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f0cd9662aa6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007f0cd68f62e5 in QWindow::event (this=0x29740e0, ev=<optimized out>) at kernel/qwindow.cpp:2060
#14 0x00007f0cd969c871 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x000000000043f206 in DesktopView::event(QEvent*) ()
#16 0x00007f0cd70ae05c in QApplicationPrivate::notify_helper (this=this@entry=0x22b5e90, receiver=receiver@entry=0x29740e0, e=e@entry=0x7ffcda449dc0) at kernel/qapplication.cpp:3716
#17 0x00007f0cd70b3516 in QApplication::notify (this=0x7ffcda44a1e0, receiver=0x29740e0, e=0x7ffcda449dc0) at kernel/qapplication.cpp:3499
#18 0x00007f0cd65ab62b in QCoreApplication::notifyInternal (this=0x7ffcda44a1e0, receiver=receiver@entry=0x29740e0, event=event@entry=0x7ffcda449dc0) at kernel/qcoreapplication.cpp:965
#19 0x00007f0cd68ee4ec in QCoreApplication::sendSpontaneousEvent (event=0x7ffcda449dc0, receiver=0x29740e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#20 QGuiApplicationPrivate::processExposeEvent (e=0x2acf250) at kernel/qguiapplication.cpp:2663
#21 0x00007f0cd68ef25d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x2acf250) at kernel/qguiapplication.cpp:1658
#22 0x00007f0cd68d2f38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#23 0x00007f0cc9fc0f10 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#24 0x00007f0cd2a6a127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f0cd2a6a380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f0cd2a6a42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f0cd6601a7f in QEventDispatcherGlib::processEvents (this=0x2393400, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#28 0x00007f0cd65a8dea in QEventLoop::exec (this=this@entry=0x7ffcda44a080, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#29 0x00007f0cd65b0e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#30 0x0000000000432d4a in main ()

Possible duplicates by query: bug 361818, bug 361806, bug 361519, bug 360584, bug 360397.

Reported using DrKonqi