Application: plasmashell (5.4.3)

Qt Version: 5.5.1
Operating System: Linux 4.5.0-2-amd64 x86_64
Distribution: Debian GNU/Linux testing (stretch)

-- Information about the crash:
- Unusual behavior I noticed:

When attaching an external monitor, my laptod screen (Thinkpad X1 Carbon) goes black and does not show menus when clicking on it.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f338bb59940 (LWP 2105))]

Thread 9 (Thread 0x7f3376b8d700 (LWP 2111)):
#0  0x00007f3386292e5d in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f338a34a382 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f338a34bff7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f3377e84789 in QXcbEventReader::run (this=0x25f7af0) at qxcbconnection.cpp:1230
#4  0x00007f338697c7fe in QThreadPrivate::start (arg=0x25f7af0) at thread/qthread_unix.cpp:331
#5  0x00007f3385a9b454 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007f338629beed in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 8 (Thread 0x7f336ffff700 (LWP 2126)):
#0  0x00007f338303b382 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f3300000001 in ?? ()
#2  0x0000000002621d40 in ?? ()
#3  0x00007f3368002e70 in ?? ()
#4  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f3366b78700 (LWP 2153)):
#0  0x00007f3386292e5d in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f338303e32c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f338303e43c in g_main_context_pending () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3386bb3a5b in QEventDispatcherGlib::processEvents (this=0x7f33600008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f3386b5ad6a in QEventLoop::exec (this=this@entry=0x7f3366b77c60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f3386977854 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f338920a105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f338697c7fe in QThreadPrivate::start (arg=0x2a68020) at thread/qthread_unix.cpp:331
#8  0x00007f3385a9b454 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9  0x00007f338629beed in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 6 (Thread 0x7f3364a23700 (LWP 2262)):
#0  0x00007f3383082a90 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f338303d8b0 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f338303e25b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f338303e43c in g_main_context_pending () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f3386bb3a5b in QEventDispatcherGlib::processEvents (this=0x7f33580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f3386b5ad6a in QEventLoop::exec (this=this@entry=0x7f3364a22c60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f3386977854 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f338920a105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f338697c7fe in QThreadPrivate::start (arg=0x2b5d9c0) at thread/qthread_unix.cpp:331
#9  0x00007f3385a9b454 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007f338629beed in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 5 (Thread 0x7f335efbd700 (LWP 2275)):
#0  0x00007f3385aa104f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f338b5b71c4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f338b5b7209 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f3385a9b454 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f338629beed in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 4 (Thread 0x7f32d7fff700 (LWP 2317)):
#0  0x00007f338303d771 in g_main_context_wait () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f32c7842700 (LWP 2588)):
#0  0x00007f3386bb19d2 in QTimerInfoList::repairTimersIfNeeded (this=0x7f32c0002cd0) at kernel/qtimerinfo_unix.cpp:154
#1  0x00007f3386bb1a63 in QTimerInfoList::timerWait (this=0x7f32c0002cd0, tm=...) at kernel/qtimerinfo_unix.cpp:382
#2  0x00007f3386bb338c in timerSourcePrepareHelper (timeout=0x7f32c7841a84, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#3  idleTimerSourcePrepare (source=<optimized out>, timeout=0x7f32c7841a84) at kernel/qeventdispatcher_glib.cpp:207
#4  0x00007f338303d8bd in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f338303e25b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f338303e43c in g_main_context_pending () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f3386bb3a5b in QEventDispatcherGlib::processEvents (this=0x7f32c00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#8  0x00007f3386b5ad6a in QEventLoop::exec (this=this@entry=0x7f32c7841c40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#9  0x00007f3386977854 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#10 0x00007f32c9d3b637 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#11 0x00007f338697c7fe in QThreadPrivate::start (arg=0x4f5d250) at thread/qthread_unix.cpp:331
#12 0x00007f3385a9b454 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#13 0x00007f338629beed in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 2 (Thread 0x7f32bb5ee700 (LWP 16660)):
#0  0x00007f338303b380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f32b4053150 in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f338bb59940 (LWP 2105)):
[KCrash Handler]
#6  Plasma::Applet::actions (this=this@entry=0x0) at ../../../src/plasma/applet.cpp:571
#7  0x00000000004545f2 in ShellCorona::addOutput (this=this@entry=0x26a81c0, output=...) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/shell/shellcorona.cpp:862
#8  0x0000000000454a31 in ShellCorona::reconsiderOutputs (this=0x26a81c0) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/shell/shellcorona.cpp:796
#9  0x00007f3386b8be0f in QtPrivate::QSlotObjectBase::call (a=0x7ffd4d9f40c0, r=0x26a81c0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#10 QMetaObject::activate (sender=sender@entry=0x26a82b0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3698
#11 0x00007f3386b8c797 in QMetaObject::activate (sender=sender@entry=0x26a82b0, m=m@entry=0x7f3386da6840 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3578
#12 0x00007f3386c0b670 in QTimer::timeout (this=this@entry=0x26a82b0) at .moc/moc_qtimer.cpp:197
#13 0x00007f3386b98838 in QTimer::timerEvent (this=0x26a82b0, e=<optimized out>) at kernel/qtimer.cpp:247
#14 0x00007f3386b8ce13 in QObject::event (this=0x26a82b0, e=<optimized out>) at kernel/qobject.cpp:1261
#15 0x00007f338765fffc in QApplicationPrivate::notify_helper (this=this@entry=0x25e3180, receiver=receiver@entry=0x26a82b0, e=e@entry=0x7ffd4d9f43f0) at kernel/qapplication.cpp:3716
#16 0x00007f33876654b6 in QApplication::notify (this=0x7ffd4d9f47b0, receiver=0x26a82b0, e=0x7ffd4d9f43f0) at kernel/qapplication.cpp:3499
#17 0x00007f3386b5d5ab in QCoreApplication::notifyInternal (this=0x7ffd4d9f47b0, receiver=0x26a82b0, event=event@entry=0x7ffd4d9f43f0) at kernel/qcoreapplication.cpp:965
#18 0x00007f3386bb285d in QCoreApplication::sendEvent (event=0x7ffd4d9f43f0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#19 QTimerInfoList::activateTimers (this=0x26217b0) at kernel/qtimerinfo_unix.cpp:637
#20 0x00007f3386bb2d99 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:224
#22 0x00007f338303e137 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f338303e390 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f338303e43c in g_main_context_pending () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f3386bb3a3f in QEventDispatcherGlib::processEvents (this=0x26177f0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#26 0x00007f3386b5ad6a in QEventLoop::exec (this=this@entry=0x7ffd4d9f4630, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#27 0x00007f3386b62e0c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#28 0x00007f3386e968bc in QGuiApplication::exec () at kernel/qguiapplication.cpp:1527
#29 0x00007f338765c435 in QApplication::exec () at kernel/qapplication.cpp:2976
#30 0x0000000000431b03 in main (argc=2, argv=<optimized out>) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/shell/main.cpp:176

Possible duplicates by query: bug 359937, bug 352600.

Reported using DrKonqi