Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.5.0-ck1 x86_64
Distribution: Ubuntu 16.04 LTS

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

I had 2 sessions open and switched from one to the other. After switching back to the first long enough for the 2nd session to screenlock, I switched to the second and it had crashed. The hardware uses a 4k monitor with 2 virtual screens which may be related.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7f24868eb900 (LWP 16352))]

Thread 8 (Thread 0x7f247127b700 (LWP 16355)):
#0  0x00007f2480ffae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f24850bfc62 in _xcb_conn_wait (__timeout=-1, __nfds=1, __fds=0x7f247127abc0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007f24850bfc62 in _xcb_conn_wait (c=c@entry=0xe12730, cond=cond@entry=0xe12770, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007f24850c18d7 in xcb_wait_for_event (c=0xe12730) at ../../src/xcb_in.c:693
#4  0x00007f24739fb629 in QXcbEventReader::run() (this=0xe20890) at qxcbconnection.cpp:1253
#5  0x00007f24816f084e in QThreadPrivate::start(void*) (arg=0xe20890) at thread/qthread_unix.cpp:331
#6  0x00007f24807dd6fa in start_thread (arg=0x7f247127b700) at pthread_create.c:333
#7  0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f246a204700 (LWP 16357)):
#0  0x00007f2480ffae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f247dd9031c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f2464003070, timeout=<optimized out>, context=0x7f2464000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f247dd9031c in g_main_context_iterate (context=context@entry=0x7f2464000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f247dd9042c in g_main_context_iteration (context=0x7f2464000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f2481927a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f24640008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f24818cedea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f246a203ca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f24816eb8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f2483f933c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f24816f084e in QThreadPrivate::start(void*) (arg=0xf094d0) at thread/qthread_unix.cpp:331
#9  0x00007f24807dd6fa in start_thread (arg=0x7f246a204700) at pthread_create.c:333
#10 0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f245fa24700 (LWP 16358)):
#0  0x00007f2480ffae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f247dd9031c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f2458002e70, timeout=<optimized out>, context=0x7f2458000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f247dd9031c in g_main_context_iterate (context=context@entry=0x7f2458000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f247dd9042c in g_main_context_iteration (context=0x7f2458000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f2481927a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f24580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f24818cedea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f245fa23ca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f24816eb8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f2483f933c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f24816f084e in QThreadPrivate::start(void*) (arg=0x105b650) at thread/qthread_unix.cpp:331
#9  0x00007f24807dd6fa in start_thread (arg=0x7f245fa24700) at pthread_create.c:333
#10 0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f245d8a7700 (LWP 16359)):
#0  0x00007f247ddd4a49 in g_mutex_lock (mutex=mutex@entry=0x7f2450000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gthread-posix.c:1338
#1  0x00007f247dd8f787 in g_main_context_prepare (context=context@entry=0x7f2450000990, priority=priority@entry=0x7f245d8a6b70) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3382
#2  0x00007f247dd9024b in g_main_context_iterate (context=context@entry=0x7f2450000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3820
#3  0x00007f247dd9042c in g_main_context_iteration (context=0x7f2450000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f2481927a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f24500008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f24818cedea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f245d8a6ca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f24816eb8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f2483f933c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f24816f084e in QThreadPrivate::start(void*) (arg=0x13cca90) at thread/qthread_unix.cpp:331
#9  0x00007f24807dd6fa in start_thread (arg=0x7f245d8a7700) at pthread_create.c:333
#10 0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f2457df7700 (LWP 16360)):
#0  0x00007f24807e33a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f2486338bd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f2486338c19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f24807dd6fa in start_thread (arg=0x7f2457df7700) at pthread_create.c:333
#4  0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f2455558700 (LWP 16361)):
#0  0x00007f2480ffae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f247dd9031c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f23cc003120, timeout=<optimized out>, context=0x7f23cc000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f247dd9031c in g_main_context_iterate (context=context@entry=0x7f23cc000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f247dd9042c in g_main_context_iteration (context=0x7f23cc000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f2481927a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f23cc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f24818cedea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f2455557c50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f24816eb8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f2484919ed6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f24816f084e in QThreadPrivate::start(void*) (arg=0x169c910) at thread/qthread_unix.cpp:331
#9  0x00007f24807dd6fa in start_thread (arg=0x7f2455558700) at pthread_create.c:333
#10 0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f23cbfff700 (LWP 16362)):
[KCrash Handler]
#6  0x00007f2480fa968d in __strstr_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strstr-sse2-unaligned.S:40
#7  0x00007f248496caca in QSGRenderContext::initialize(QOpenGLContext*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f2484990409 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f24816f084e in QThreadPrivate::start(void*) (arg=0x15dc030) at thread/qthread_unix.cpp:331
#10 0x00007f24807dd6fa in start_thread (arg=0x7f23cbfff700) at pthread_create.c:333
#11 0x00007f2481006b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f24868eb900 (LWP 16352)):
#0  0x00007f24807e33a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f24816f1aeb in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x153d920) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f24816f1aeb in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x15dc070, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f248498cbc6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f248498f09c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f248498f733 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2481c1c2e5 in QWindow::event(QEvent*) (this=0x15d1100, ev=<optimized out>) at kernel/qwindow.cpp:2060
#7  0x00007f24849c2871 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x000000000043f206 in DesktopView::event(QEvent*) (this=0x15d1100, e=0x7ffd8ebcc180) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/desktopview.cpp:205
#9  0x00007f24823d405c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0xdec460, receiver=receiver@entry=0x15d1100, e=e@entry=0x7ffd8ebcc180) at kernel/qapplication.cpp:3716
#10 0x00007f24823d9516 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd8ebcc5a0, receiver=0x15d1100, e=0x7ffd8ebcc180) at kernel/qapplication.cpp:3499
#11 0x00007f24818d162b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd8ebcc5a0, receiver=receiver@entry=0x15d1100, event=event@entry=0x7ffd8ebcc180) at kernel/qcoreapplication.cpp:965
#12 0x00007f2481c144ec in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (event=0x7ffd8ebcc180, receiver=0x15d1100) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#13 0x00007f2481c144ec in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (e=0x1595f10) at kernel/qguiapplication.cpp:2663
#14 0x00007f2481c1525d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x1595f10) at kernel/qguiapplication.cpp:1658
#15 0x00007f2481bf8f38 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:625
#16 0x00007f2473a2cf10 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#17 0x00007f247dd90127 in g_main_context_dispatch (context=0x7f246c001710) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3154
#18 0x00007f247dd90127 in g_main_context_dispatch (context=context@entry=0x7f246c001710) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3769
#19 0x00007f247dd90380 in g_main_context_iterate (context=context@entry=0x7f246c001710, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3840
#20 0x00007f247dd9042c in g_main_context_iteration (context=0x7f246c001710, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#21 0x00007f2481927a7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0xde2310, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f24818cedea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd8ebcc440, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f24818d6e8c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1229
#24 0x00007f2481c0ac3c in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1542
#25 0x00007f24823d0495 in QApplication::exec() () at kernel/qapplication.cpp:2976
#26 0x0000000000432d4a in main(int, char**) (argc=4, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Reported using DrKonqi