Bug 372317

Summary: Crash upon re-enabling display in 4k
Product: [Plasma] plasmashell Reporter: Con Kolivas <kde>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: crash CC: bhush94, plasma-bugs
Priority: NOR Keywords: drkonqi
Version: 5.5.5   
Target Milestone: 1.0   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Con Kolivas 2016-11-11 00:34:32 UTC 
Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.8.6-cktest+ x86_64
Distribution: Ubuntu 16.04.1 LTS

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

I am running a 4k monitor which is seen as two screens. A wine application had resized one screen only (mistakenly) while trying to go fullscreen. Upon killing the wine application I used the kde display configuration to re-enable the screen at its correct resolution. This caused the crash even though it did resize and enable the screen.

-- 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 0x7f9a4e18d8c0 (LWP 1140))]

Thread 13 (Thread 0x7f9975768700 (LWP 2797)):
[KCrash Handler]
#6  0x00007f9900000005 in  ()
#7  0x00007f9a497b8171 in QOpenGLShaderProgram::setUniformValue(int, float) (v=0x7f997576788c, count=1, location=<optimized out>, this=<optimized out>) at opengl/qopenglfunctions.h:1833
#8  0x00007f9a497b8171 in QOpenGLShaderProgram::setUniformValue(int, float) (this=<optimized out>, location=<optimized out>, value=value@entry=0) at opengl/qopenglshaderprogram.cpp:1934
#9  0x00007f9a1d4b9ff9 in Plotter::render() (this=0x3995560) at ../../../../src/qmlcontrols/kquickcontrolsaddons/plotter.cpp:659
#10 0x00007f9a491abbaf in QMetaObject::activate(QObject*, int, int, void**) (a=0x7f9975767b00, r=0x3995560, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#11 0x00007f9a491abbaf in QMetaObject::activate(QObject*, int, int, void**) (sender=0x163fe10, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3698
#12 0x00007f9a4c262ece in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007f9a4c2369c8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007f9a4c23c08c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x3c5c050) at thread/qthread_unix.cpp:331
#16 0x00007f9a4808970a in start_thread (arg=0x7f9975768700) at pthread_create.c:333
#17 0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7f998f7ff700 (LWP 2796)):
#0  0x00007f9a4808f3b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x1e31240) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x4905bd0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9a4c23b92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9a4c23c1b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x4905b50) at thread/qthread_unix.cpp:331
#6  0x00007f9a4808970a in start_thread (arg=0x7f998f7ff700) at pthread_create.c:333
#7  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f995f1d3700 (LWP 1419)):
#0  0x00007f9a4808f3b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x2ff7de0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x4711100, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9a4c23b92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9a4c23c1b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x4711080) at thread/qthread_unix.cpp:331
#6  0x00007f9a4808970a in start_thread (arg=0x7f995f1d3700) at pthread_create.c:333
#7  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f997664a700 (LWP 1161)):
#0  0x00007f9a4808f3b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x2c58c90) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x248da20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9a4c23b92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9a4c23c1b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x248d9a0) at thread/qthread_unix.cpp:331
#6  0x00007f9a4808970a in start_thread (arg=0x7f997664a700) at pthread_create.c:333
#7  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f99776de700 (LWP 1152)):
#0  0x00007f9a45680ac9 in g_mutex_lock (mutex=mutex@entry=0x7f9970000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gthread-posix.c:1335
#1  0x00007f9a4563b939 in g_main_context_prepare (context=context@entry=0x7f9970000990, priority=priority@entry=0x7f99776ddb90) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3444
#2  0x00007f9a4563c2cb in g_main_context_iterate (context=context@entry=0x7f9970000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3820
#3  0x00007f9a4563c4ac in g_main_context_iteration (context=0x7f9970000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007f9a491d37eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f99700008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9a4917ab4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f99776ddcc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9a48f97834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f9979bbc7d7 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x3071a00) at thread/qthread_unix.cpp:331
#9  0x00007f9a4808970a in start_thread (arg=0x7f99776de700) at pthread_create.c:333
#10 0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f99977fe700 (LWP 1148)):
#0  0x00007f9a4808f3b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x1f3b280) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x1e51ab0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9a4c23b92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9a4c23c1b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x1e51a30) at thread/qthread_unix.cpp:331
#6  0x00007f9a4808970a in start_thread (arg=0x7f99977fe700) at pthread_create.c:333
#7  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f9997fff700 (LWP 1146)):
#0  0x00007f9a45680ae0 in g_mutex_unlock (mutex=0x7f9990000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gthread-posix.c:1344
#1  0x00007f9a4563c4b6 in g_main_context_iteration (context=0x7f9990000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3902
#2  0x00007f9a491d37eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f99900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#3  0x00007f9a4917ab4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9997ffec90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007f9a48f97834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#5  0x00007f9a4c1c5ed6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x1f221f0) at thread/qthread_unix.cpp:331
#7  0x00007f9a4808970a in start_thread (arg=0x7f9997fff700) at pthread_create.c:333
#8  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f9a1edf6700 (LWP 1145)):
#0  0x00007f9a4808f3b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9a4dbe4bd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f9a4dbe4c19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f9a4808970a in start_thread (arg=0x7f9a1edf6700) at pthread_create.c:333
#4  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f9a1ffff700 (LWP 1144)):
#0  0x00007f9a48f94d57 in QMutex::unlock() (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=0x1, _q_value=@0x1c506d8: 0x1) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  0x00007f9a48f94d57 in QMutex::unlock() (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=<optimized out>, _q_value=@0x1c506d8: 0x1) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:175
#2  0x00007f9a48f94d57 in QMutex::unlock() (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=<optimized out>, this=this@entry=0x1c506d8) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:278
#3  0x00007f9a48f94d57 in QMutex::unlock() (current=<synthetic pointer>, this=this@entry=0x1c506d8) at thread/qmutex.h:85
#4  0x00007f9a48f94d57 in QMutex::unlock() (this=this@entry=0x1c506d8) at thread/qmutex.cpp:264
#5  0x00007f9a491d2d81 in postEventSourcePrepare(GSource*, gint*) (this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:138
#6  0x00007f9a491d2d81 in postEventSourcePrepare(GSource*, gint*) (this=<synthetic pointer>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:132
#7  0x00007f9a491d2d81 in postEventSourcePrepare(GSource*, gint*) (this=0x1c506b0) at ../../include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:240
#8  0x00007f9a491d2d81 in postEventSourcePrepare(GSource*, gint*) (s=0x7f9a180012d0, timeout=timeout@entry=0x7f9a1fffeb24) at kernel/qeventdispatcher_glib.cpp:254
#9  0x00007f9a4563b92d in g_main_context_prepare (context=context@entry=0x7f9a18000990, priority=priority@entry=0x7f9a1fffebb0) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3442
#10 0x00007f9a4563c2cb in g_main_context_iterate (context=context@entry=0x7f9a18000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3820
#11 0x00007f9a4563c4ac in g_main_context_iteration (context=0x7f9a18000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#12 0x00007f9a491d37eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9a180008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#13 0x00007f9a4917ab4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9a1fffece0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#14 0x00007f9a48f97834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#15 0x00007f9a4b83f3c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x1c837b0) at thread/qthread_unix.cpp:331
#17 0x00007f9a4808970a in start_thread (arg=0x7f9a1ffff700) at pthread_create.c:333
#18 0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f9a26879700 (LWP 1143)):
#0  0x00007f9a488a6b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9a4563c39c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f9a20002e70, timeout=<optimized out>, context=0x7f9a20000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:4135
#2  0x00007f9a4563c39c in g_main_context_iterate (context=context@entry=0x7f9a20000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3835
#3  0x00007f9a4563c4ac in g_main_context_iteration (context=0x7f9a20000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007f9a491d37eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9a200008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9a4917ab4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9a26878ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9a48f97834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f9a4b83f3c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x1a71ed0) at thread/qthread_unix.cpp:331
#9  0x00007f9a4808970a in start_thread (arg=0x7f9a26879700) at pthread_create.c:333
#10 0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f9a333ea700 (LWP 1142)):
#0  0x00007f9a488a6b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9a4563c39c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f9a2c003070, timeout=<optimized out>, context=0x7f9a2c000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:4135
#2  0x00007f9a4563c39c in g_main_context_iterate (context=context@entry=0x7f9a2c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3835
#3  0x00007f9a4563c4ac in g_main_context_iteration (context=0x7f9a2c000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007f9a491d37eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9a2c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9a4917ab4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9a333e9ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9a48f97834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f9a4b83f3c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x171cfe0) at thread/qthread_unix.cpp:331
#9  0x00007f9a4808970a in start_thread (arg=0x7f9a333ea700) at pthread_create.c:333
#10 0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f9a3a541700 (LWP 1141)):
#0  0x00007f9a488a6b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9a4c96bc62 in _xcb_conn_wait (__timeout=-1, __nfds=1, __fds=0x7f9a3a540c00) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007f9a4c96bc62 in _xcb_conn_wait (c=c@entry=0x1626e40, cond=cond@entry=0x1626e80, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007f9a4c96d8d7 in xcb_wait_for_event (c=0x1626e40) at ../../src/xcb_in.c:693
#4  0x00007f9a3ccc1629 in QXcbEventReader::run() (this=0x1634fd0) at qxcbconnection.cpp:1253
#5  0x00007f9a48f9c7be in QThreadPrivate::start(void*) (arg=0x1634fd0) at thread/qthread_unix.cpp:331
#6  0x00007f9a4808970a in start_thread (arg=0x7f9a3a541700) at pthread_create.c:333
#7  0x00007f9a488b282d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f9a4e18d8c0 (LWP 1140)):
#0  0x00007f9a4808f3b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x1d88cb0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9a48f9da5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x3c5c090, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9a4c238bc6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9a4c23b09c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9a4c23b733 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f9a494c82b5 in QWindow::event(QEvent*) (this=0x163fe10, ev=<optimized out>) at kernel/qwindow.cpp:2060
#7  0x00007f9a4c26e871 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x0000000000444a8b in PanelView::event(QEvent*) (this=0x163fe10, e=0x7ffc6e1bb800) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/panelview.cpp:844
#9  0x00007f9a49c8005c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x1614380, receiver=receiver@entry=0x163fe10, e=e@entry=0x7ffc6e1bb800) at kernel/qapplication.cpp:3716
#10 0x00007f9a49c85516 in QApplication::notify(QObject*, QEvent*) (this=0x7ffc6e1bbc20, receiver=0x163fe10, e=0x7ffc6e1bb800) at kernel/qapplication.cpp:3499
#11 0x00007f9a4917d38b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffc6e1bbc20, receiver=receiver@entry=0x163fe10, event=event@entry=0x7ffc6e1bb800) at kernel/qcoreapplication.cpp:965
#12 0x00007f9a494c04ac in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (event=0x7ffc6e1bb800, receiver=0x163fe10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#13 0x00007f9a494c04ac in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (e=0x46b8350) at kernel/qguiapplication.cpp:2663
#14 0x00007f9a494c121d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x46b8350) at kernel/qguiapplication.cpp:1658
#15 0x00007f9a494a4f08 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:625
#16 0x00007f9a3ccf3060 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#17 0x00007f9a4563c1a7 in g_main_context_dispatch (context=0x7f9a340016f0) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3154
#18 0x00007f9a4563c1a7 in g_main_context_dispatch (context=context@entry=0x7f9a340016f0) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3769
#19 0x00007f9a4563c400 in g_main_context_iterate (context=context@entry=0x7f9a340016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3840
#20 0x00007f9a4563c4ac in g_main_context_iteration (context=0x7f9a340016f0, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#21 0x00007f9a491d37cf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x166a390, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f9a4917ab4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffc6e1bbac0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f9a49182bec in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1229
#24 0x00007f9a494b6bfc in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1542
#25 0x00007f9a49c7c495 in QApplication::exec() () at kernel/qapplication.cpp:2976
#26 0x0000000000432d4a in main(int, char**) (argc=1, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Reported using DrKonqi
Comment 1 Con Kolivas 2016-11-11 09:21:10 UTC 
Recurred with slightly different backtrace (drkonqi still won't do anything useful when I select the same bug so I'm cut/pasting it here.)


Backtrace of the crash I experienced:

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 0x7fc0d21248c0 (LWP 2799))]

Thread 19 (Thread 0x7fbfbf7ff700 (LWP 24289)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x5790c40) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5deafa0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x5deaf20) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfbf7ff700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 18 (Thread 0x7fbff9d14700 (LWP 6838)):
[KCrash Handler]
#6  0x00007fc0cd74fc05 in QOpenGLShaderProgram::setUniformValue(int, QMatrix4x4 const&) (value=<optimized out>, transpose=0 '\000', count=1, location=2, this=<optimized out>) at opengl/qopenglfunctions.h:2020
#7  0x00007fc0cd74fc05 in QOpenGLShaderProgram::setUniformValue(int, QMatrix4x4 const&) (this=<optimized out>, location=2, value=...) at opengl/qopenglshaderprogram.cpp:2590
#8  0x00007fc0a13b1f78 in Plotter::render() (this=0x39db2f0) at ../../../../src/qmlcontrols/kquickcontrolsaddons/plotter.cpp:652
#9  0x00007fc0cd142baf in QMetaObject::activate(QObject*, int, int, void**) (a=0x7fbff9d13b00, r=0x39db2f0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#10 0x00007fc0cd142baf in QMetaObject::activate(QObject*, int, int, void**) (sender=0x467da20, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3698
#11 0x00007fc0d01f9ece in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fc0d01cd9c8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007fc0d01d308c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x3a95900) at thread/qthread_unix.cpp:331
#15 0x00007fc0cc02070a in start_thread (arg=0x7fbff9d14700) at pthread_create.c:333
#16 0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7fc0137ff700 (LWP 6836)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x2988150) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x600a6d0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x600a650) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fc0137ff700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 16 (Thread 0x7fbfd33fe700 (LWP 6420)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x45af6c0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x3f7e1b0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x3f7e130) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfd33fe700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7fbfd3bff700 (LWP 5406)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x4a34fe0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x44b4ac0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x44b4a40) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfd3bff700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7fbfe0e4a700 (LWP 5304)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x3fc63d0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x45fe660, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x45fe5e0) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfe0e4a700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7fbfe19fe700 (LWP 3955)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x4332bf0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x3c88b50, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x3c88ad0) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfe19fe700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7fbfe2ab8700 (LWP 3379)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x4a33170) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x4621a40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x46219c0) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfe2ab8700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7fbfe3d19700 (LWP 2866)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x46d5bd0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x2e361a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x2e36120) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbfe3d19700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7fbffa7e8700 (LWP 2817)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x24adfc0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x23e7d70, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x23e7cf0) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fbffa7e8700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7fbffb67c700 (LWP 2814)):
#0  0x00007fc0c9617ae4 in g_mutex_unlock (mutex=0x7fbff4000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gthread-posix.c:1347
#1  0x00007fc0c95d3356 in g_main_context_iterate (context=context@entry=0x7fbff4000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3842
#2  0x00007fc0c95d34ac in g_main_context_iteration (context=0x7fbff4000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#3  0x00007fc0cd16a7eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbff40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007fc0cd111b4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fbffb67bcc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fc0ccf2e834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fbffdb5a7d7 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x31dc0e0) at thread/qthread_unix.cpp:331
#8  0x00007fc0cc02070a in start_thread (arg=0x7fbffb67c700) at pthread_create.c:333
#9  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fc01b7fe700 (LWP 2809)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x1f32090) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x1e39cd0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01d292e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d31b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x1e39c50) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fc01b7fe700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fc01bfff700 (LWP 2808)):
#0  0x00007fc0cc83db5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc0c95d339c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fc014003060, timeout=<optimized out>, context=0x7fc014000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:4135
#2  0x00007fc0c95d339c in g_main_context_iterate (context=context@entry=0x7fc014000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3835
#3  0x00007fc0c95d34ac in g_main_context_iteration (context=0x7fc014000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007fc0cd16a7eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fc0140008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007fc0cd111b4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fc01bffec90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fc0ccf2e834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fc0d015ced6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x1f214c0) at thread/qthread_unix.cpp:331
#9  0x00007fc0cc02070a in start_thread (arg=0x7fc01bfff700) at pthread_create.c:333
#10 0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fc0a2bee700 (LWP 2807)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0d1b7bbd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fc0d1b7bc19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fc0cc02070a in start_thread (arg=0x7fc0a2bee700) at pthread_create.c:333
#4  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fc0a3fff700 (LWP 2806)):
#0  0x00007fc0cc83db5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc0c95d339c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fc09c003070, timeout=<optimized out>, context=0x7fc09c000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:4135
#2  0x00007fc0c95d339c in g_main_context_iterate (context=context@entry=0x7fc09c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3835
#3  0x00007fc0c95d34ac in g_main_context_iteration (context=0x7fc09c000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007fc0cd16a7eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fc09c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007fc0cd111b4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fc0a3ffece0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fc0ccf2e834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fc0cf7d63c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x1c831c0) at thread/qthread_unix.cpp:331
#9  0x00007fc0cc02070a in start_thread (arg=0x7fc0a3fff700) at pthread_create.c:333
#10 0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fc0aa879700 (LWP 2805)):
#0  0x00007fc0c9617af0 in g_mutex_unlock (mutex=0x7fc0a4000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gthread-posix.c:1348
#1  0x00007fc0c95d239e in g_main_context_acquire (context=0x7fc0a4000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3228
#2  0x00007fc0c95d3255 in g_main_context_iterate (context=context@entry=0x7fc0a4000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3790
#3  0x00007fc0c95d34ac in g_main_context_iteration (context=0x7fc0a4000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007fc0cd16a7eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fc0a40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007fc0cd111b4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fc0aa878ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fc0ccf2e834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fc0cf7d63c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x1a673d0) at thread/qthread_unix.cpp:331
#9  0x00007fc0cc02070a in start_thread (arg=0x7fc0aa879700) at pthread_create.c:333
#10 0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fc0b73ea700 (LWP 2804)):
#0  0x00007fc0cc83db5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc0c95d339c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fc0b0003070, timeout=<optimized out>, context=0x7fc0b0000990) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:4135
#2  0x00007fc0c95d339c in g_main_context_iterate (context=context@entry=0x7fc0b0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3835
#3  0x00007fc0c95d34ac in g_main_context_iteration (context=0x7fc0b0000990, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#4  0x00007fc0cd16a7eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fc0b00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007fc0cd111b4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fc0b73e9ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fc0ccf2e834 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fc0cf7d63c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x171c0b0) at thread/qthread_unix.cpp:331
#9  0x00007fc0cc02070a in start_thread (arg=0x7fc0b73ea700) at pthread_create.c:333
#10 0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fc0be4d8700 (LWP 2802)):
#0  0x00007fc0cc83db5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc0d0902c62 in _xcb_conn_wait (__timeout=-1, __nfds=1, __fds=0x7fc0be4d7c00) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007fc0d0902c62 in _xcb_conn_wait (c=c@entry=0x1625e30, cond=cond@entry=0x1625e70, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007fc0d09048d7 in xcb_wait_for_event (c=0x1625e30) at ../../src/xcb_in.c:693
#4  0x00007fc0c0c58629 in QXcbEventReader::run() (this=0x1633fe0) at qxcbconnection.cpp:1253
#5  0x00007fc0ccf337be in QThreadPrivate::start(void*) (arg=0x1633fe0) at thread/qthread_unix.cpp:331
#6  0x00007fc0cc02070a in start_thread (arg=0x7fc0be4d8700) at pthread_create.c:333
#7  0x00007fc0cc84982d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fc0d21248c0 (LWP 2799)):
#0  0x00007fc0cc0263b0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x586d450) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fc0ccf34a5b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x3a95940, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fc0d01cfbc6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fc0d01d209c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fc0d01d2733 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fc0cd45f2b5 in QWindow::event(QEvent*) (this=0x467da20, ev=<optimized out>) at kernel/qwindow.cpp:2060
#7  0x00007fc0d0205871 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x0000000000444a8b in PanelView::event(QEvent*) (this=0x467da20, e=0x7ffdb7b08420) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/panelview.cpp:844
#9  0x00007fc0cdc1705c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x1613380, receiver=receiver@entry=0x467da20, e=e@entry=0x7ffdb7b08420) at kernel/qapplication.cpp:3716
#10 0x00007fc0cdc1c516 in QApplication::notify(QObject*, QEvent*) (this=0x7ffdb7b08840, receiver=0x467da20, e=0x7ffdb7b08420) at kernel/qapplication.cpp:3499
#11 0x00007fc0cd11438b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffdb7b08840, receiver=receiver@entry=0x467da20, event=event@entry=0x7ffdb7b08420) at kernel/qcoreapplication.cpp:965
#12 0x00007fc0cd4574ac in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (event=0x7ffdb7b08420, receiver=0x467da20) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#13 0x00007fc0cd4574ac in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (e=0x6084c40) at kernel/qguiapplication.cpp:2663
#14 0x00007fc0cd45821d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x6084c40) at kernel/qguiapplication.cpp:1658
#15 0x00007fc0cd43bf08 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:625
#16 0x00007fc0c0c8a060 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#17 0x00007fc0c95d31a7 in g_main_context_dispatch (context=0x7fc0b80016f0) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3154
#18 0x00007fc0c95d31a7 in g_main_context_dispatch (context=context@entry=0x7fc0b80016f0) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3769
#19 0x00007fc0c95d3400 in g_main_context_iterate (context=context@entry=0x7fc0b80016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3840
#20 0x00007fc0c95d34ac in g_main_context_iteration (context=0x7fc0b80016f0, may_block=may_block@entry=1) at /build/glib2.0-7IO_Yw/glib2.0-2.48.1/./glib/gmain.c:3901
#21 0x00007fc0cd16a7cf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x165e040, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007fc0cd111b4a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffdb7b086e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007fc0cd119bec in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1229
#24 0x00007fc0cd44dbfc in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1542
#25 0x00007fc0cdc13495 in QApplication::exec() () at kernel/qapplication.cpp:2976
#26 0x0000000000432d4a in main(int, char**) (argc=3, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181
Comment 2 Christoph Feck 2016-11-11 14:47:47 UTC 
Please try with Qt 5.6.2.
Comment 3 Con Kolivas 2016-11-13 02:54:00 UTC 
Thanks for the suggestion. Alas the usual production problem applies - I'm stuck with whatever kubuntu packages for Ubuntu 16.04 LTS are limited to.
Comment 4 Christoph Feck 2016-11-15 08:54:23 UTC 

*** This bug has been marked as a duplicate of bug 349289 ***
Comment 5 Christoph Feck 2017-04-26 22:54:52 UTC 
*** Bug 378358 has been marked as a duplicate of this bug. ***