Bug 355926

Application: plasmashell (5.4.3)

Qt Version: 5.5.1
Operating System: Linux 4.2.6-300.fc23.x86_64 x86_64
Distribution: "Fedora release 23 (Twenty Three)"

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

System Settings:
1. Chose third monitor and switch it off.
2. Switch it on again.
3. Crash.

- Unusual behavior I noticed:

1. I was switching off this monitor because it was black after login (situation was repeatable since last week or more).
2. I decided to try disabling it and enabling again.
3. Crash occured, but after that this monitor is finaly "visible by plasma", so I can set wallpapers, open context menu etc.
4. Before that the monitor background was black. I could move windows to it, open yakuake by shortcut, but could not open context menu for setting wallpaper, panels etc.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
84	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f57dc792940 (LWP 2932))]

Thread 8 (Thread 0x7f57bc4b4700 (LWP 2939)):
#0  0x00007f57d41aefdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f57da649272 in poll (__timeout=-1, __nfds=1, __fds=0x7f57bc4b3b80) at /usr/include/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x55e2215e3b60, cond=cond@entry=0x55e2215e3ba0, vector=vector@entry=0x0, count=count@entry=0x0) at xcb_conn.c:459
#3  0x00007f57da64aee7 in xcb_wait_for_event (c=0x55e2215e3b60) at xcb_in.c:693
#4  0x00007f57be438da9 in QXcbEventReader::run (this=0x55e2215edc00) at qxcbconnection.cpp:1254
#5  0x00007f57d4db73ce in QThreadPrivate::start (arg=0x55e2215edc00) at thread/qthread_unix.cpp:331
#6  0x00007f57d2e5660a in start_thread (arg=0x7f57bc4b4700) at pthread_create.c:334
#7  0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f57b9a6c700 (LWP 2948)):
#0  g_mutex_unlock (mutex=0x7f57ac000990) at gthread-posix.c:1350
#1  0x00007f57cf2e2286 in g_main_context_iteration (context=0x7f57ac000990, may_block=may_block@entry=1) at gmain.c:3902
#2  0x00007f57d4feef0b in QEventDispatcherGlib::processEvents (this=0x7f57ac0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#3  0x00007f57d4f95f0a in QEventLoop::exec (this=this@entry=0x7f57b9a6bc60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007f57d4db2424 in QThread::exec (this=this@entry=0x55e2216c18e0) at thread/qthread.cpp:503
#5  0x00007f57d90d5b45 in QQmlThreadPrivate::run (this=0x55e2216c18e0) at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/qml/qml/ftw/qqmlthread.cpp:141
#6  0x00007f57d4db73ce in QThreadPrivate::start (arg=0x55e2216c18e0) at thread/qthread_unix.cpp:331
#7  0x00007f57d2e5660a in start_thread (arg=0x7f57b9a6c700) at pthread_create.c:334
#8  0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f57b0e5a700 (LWP 2970)):
#0  g_main_context_query (context=context@entry=0x7f57a8000990, max_priority=2147483647, timeout=timeout@entry=0x7f57b0e59b34, fds=fds@entry=0x7f57a8002e70, n_fds=n_fds@entry=1) at gmain.c:3548
#1  0x00007f57cf2e20e7 in g_main_context_iterate (context=context@entry=0x7f57a8000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3822
#2  0x00007f57cf2e227c in g_main_context_iteration (context=0x7f57a8000990, may_block=may_block@entry=1) at gmain.c:3901
#3  0x00007f57d4feef0b in QEventDispatcherGlib::processEvents (this=0x7f57a80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f57d4f95f0a in QEventLoop::exec (this=this@entry=0x7f57b0e59c60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f57d4db2424 in QThread::exec (this=this@entry=0x55e22198f7c0) at thread/qthread.cpp:503
#6  0x00007f57d90d5b45 in QQmlThreadPrivate::run (this=0x55e22198f7c0) at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/qml/qml/ftw/qqmlthread.cpp:141
#7  0x00007f57d4db73ce in QThreadPrivate::start (arg=0x55e22198f7c0) at thread/qthread_unix.cpp:331
#8  0x00007f57d2e5660a in start_thread (arg=0x7f57b0e5a700) at pthread_create.c:334
#9  0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f57a71ad700 (LWP 3130)):
#0  0x00007fffa63cea94 in clock_gettime ()
#1  0x00007f57d41c8d16 in __GI___clock_gettime (clock_id=1, tp=tp@entry=0x7f57a71ac9d0) at ../sysdeps/unix/clock_gettime.c:115
#2  0x00007f57d4e67956 in qt_clock_gettime (ts=0x7f57a71ac9d0, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#3  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#4  qt_gettime () at tools/qelapsedtimer_unix.cpp:165
#5  0x00007f57d4fec999 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f57a0002ed0) at kernel/qtimerinfo_unix.cpp:84
#6  0x00007f57d4fecf05 in QTimerInfoList::timerWait (this=0x7f57a0002ed0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#7  0x00007f57d4fee2ee in timerSourcePrepareHelper (timeout=0x7f57a71acaa4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#8  timerSourcePrepare (source=<optimized out>, timeout=timeout@entry=0x7f57a71acaa4) at kernel/qeventdispatcher_glib.cpp:160
#9  0x00007f57cf2e170d in g_main_context_prepare (context=context@entry=0x7f57a0000990, priority=priority@entry=0x7f57a71acb30) at gmain.c:3442
#10 0x00007f57cf2e209b in g_main_context_iterate (context=context@entry=0x7f57a0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3820
#11 0x00007f57cf2e227c in g_main_context_iteration (context=0x7f57a0000990, may_block=may_block@entry=1) at gmain.c:3901
#12 0x00007f57d4feef0b in QEventDispatcherGlib::processEvents (this=0x7f57a00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#13 0x00007f57d4f95f0a in QEventLoop::exec (this=this@entry=0x7f57a71acc60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#14 0x00007f57d4db2424 in QThread::exec (this=this@entry=0x55e221a97760) at thread/qthread.cpp:503
#15 0x00007f57d90d5b45 in QQmlThreadPrivate::run (this=0x55e221a97760) at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/qml/qml/ftw/qqmlthread.cpp:141
#16 0x00007f57d4db73ce in QThreadPrivate::start (arg=0x55e221a97760) at thread/qthread_unix.cpp:331
#17 0x00007f57d2e5660a in start_thread (arg=0x7f57a71ad700) at pthread_create.c:334
#18 0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f57a5839700 (LWP 3142)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f57dbf1b514 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f57dc204380 <QTWTF::pageheap_memory>) at /usr/src/debug/qtscript-opensource-src-5.5.1/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f57dbf1b559 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at /usr/src/debug/qtscript-opensource-src-5.5.1/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f57d2e5660a in start_thread (arg=0x7f57a5839700) at pthread_create.c:334
#4  0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f571eb9d700 (LWP 3165)):
#0  g_mutex_unlock (mutex=0x7f5718000990) at gthread-posix.c:1350
#1  0x00007f57cf2e19e9 in g_main_context_query (context=context@entry=0x7f5718000990, max_priority=2147483647, timeout=timeout@entry=0x7f571eb9cae4, fds=fds@entry=0x7f5718003150, n_fds=n_fds@entry=1) at gmain.c:3589
#2  0x00007f57cf2e20e7 in g_main_context_iterate (context=context@entry=0x7f5718000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3822
#3  0x00007f57cf2e227c in g_main_context_iteration (context=0x7f5718000990, may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007f57d4feef0b in QEventDispatcherGlib::processEvents (this=0x7f57180008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f57d4f95f0a in QEventLoop::exec (this=this@entry=0x7f571eb9cc10, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f57d4db2424 in QThread::exec (this=this@entry=0x55e221d3c2d0) at thread/qthread.cpp:503
#7  0x00007f57d9c7f8d6 in QQuickPixmapReader::run (this=0x55e221d3c2d0) at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/quick/util/qquickpixmapcache.cpp:760
#8  0x00007f57d4db73ce in QThreadPrivate::start (arg=0x55e221d3c2d0) at thread/qthread_unix.cpp:331
#9  0x00007f57d2e5660a in start_thread (arg=0x7f571eb9d700) at pthread_create.c:334
#10 0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f570e644700 (LWP 3288)):
#0  0x00007f57d41aefdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f57cf2e216c in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f57080048c0, timeout=<optimized out>, context=0x7f5708000990) at gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f5708000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3835
#3  0x00007f57cf2e227c in g_main_context_iteration (context=0x7f5708000990, may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007f57d4feef0b in QEventDispatcherGlib::processEvents (this=0x7f57080008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f57d4f95f0a in QEventLoop::exec (this=this@entry=0x7f570e643c40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f57d4db2424 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f571027a3c7 in KCupsConnection::run() () from /lib64/libkcupslib.so
#8  0x00007f57d4db73ce in QThreadPrivate::start (arg=0x55e223b22b40) at thread/qthread_unix.cpp:331
#9  0x00007f57d2e5660a in start_thread (arg=0x7f570e644700) at pthread_create.c:334
#10 0x00007f57d41baa7d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f57dc792940 (LWP 2932)):
[KCrash Handler]
#6  Plasma::Applet::actions (this=this@entry=0x0) at ../../../src/plasma/applet.cpp:571
#7  0x000055e22002f289 in ShellCorona::addOutput (this=this@entry=0x55e2216afa00, output=...) at ../../shell/shellcorona.cpp:862
#8  0x000055e22002f40f in ShellCorona::outputEnabledChanged (this=0x55e2216afa00) at ../../shell/shellcorona.cpp:756
#9  0x00007f57d4fc7177 in QtPrivate::QSlotObjectBase::call (a=0x7fffa626a790, r=0x55e2216afa00, this=<optimized out>) at ../../src/corelib/kernel/qobject_impl.h:124
#10 QMetaObject::activate (sender=0x55e2216c2bd0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3698
#11 0x00007f57db66ef97 in KScreen::Output::apply (this=<optimized out>, other=...) at ../../src/output.cpp:516
#12 0x00007f57db65abde in KScreen::Config::apply (this=this@entry=0x55e221a8aae0, other=...) at ../../src/config.cpp:343
#13 0x00007f57db661c49 in KScreen::ConfigMonitor::Private::updateConfigs (this=this@entry=0x55e221ba9f80, newConfig=...) at ../../src/configmonitor.cpp:174
#14 0x00007f57db663f39 in KScreen::ConfigMonitor::Private::edidReady (this=0x55e221ba9f80, watcher=<optimized out>) at ../../src/configmonitor.cpp:159
#15 0x00007f57d4fc7177 in QtPrivate::QSlotObjectBase::call (a=0x7fffa626ab90, r=0x55e221ba9f80, this=<optimized out>) at ../../src/corelib/kernel/qobject_impl.h:124
#16 QMetaObject::activate (sender=0x55e224092b70, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffa626ab90) at kernel/qobject.cpp:3698
#17 0x00007f57d4fc7ae7 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7f57d5fa8a40 <QDBusPendingCallWatcher::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffa626ab90) at kernel/qobject.cpp:3578
#18 0x00007f57d5d8f7ef in QDBusPendingCallWatcher::finished (this=<optimized out>, _t1=0x55e224092b70) at .moc/moc_qdbuspendingcall.cpp:148
#19 0x00007f57d5d90ec5 in QDBusPendingCallWatcherPrivate::_q_finished (this=<optimized out>) at qdbuspendingcall.cpp:488
#20 QDBusPendingCallWatcher::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qdbuspendingcall.cpp:80
#21 0x00007f57d4fc81b1 in QObject::event (this=0x55e224092b70, e=<optimized out>) at kernel/qobject.cpp:1239
#22 0x00007f57d654c41c in QApplicationPrivate::notify_helper (this=this@entry=0x55e2215d61a0, receiver=receiver@entry=0x55e224092b70, e=e@entry=0x55e223f65cd0) at kernel/qapplication.cpp:3716
#23 0x00007f57d65518e6 in QApplication::notify (this=0x7fffa626b2a0, receiver=0x55e224092b70, e=0x55e223f65cd0) at kernel/qapplication.cpp:3499
#24 0x00007f57d4f9877b in QCoreApplication::notifyInternal (this=0x7fffa626b2a0, receiver=0x55e224092b70, event=event@entry=0x55e223f65cd0) at kernel/qcoreapplication.cpp:965
#25 0x00007f57d4f9ab76 in QCoreApplication::sendEvent (event=0x55e223f65cd0, receiver=<optimized out>) at kernel/qcoreapplication.h:224
#26 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x55e2215cc550) at kernel/qcoreapplication.cpp:1593
#27 0x00007f57d4f9b058 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1451
#28 0x00007f57d4feeae3 in postEventSourceDispatch (s=0x55e2216183e0) at kernel/qeventdispatcher_glib.cpp:271
#29 0x00007f57cf2e1e3a in g_main_dispatch (context=0x7f57b40016f0) at gmain.c:3154
#30 g_main_context_dispatch (context=context@entry=0x7f57b40016f0) at gmain.c:3769
#31 0x00007f57cf2e21d0 in g_main_context_iterate (context=context@entry=0x7f57b40016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3840
#32 0x00007f57cf2e227c in g_main_context_iteration (context=0x7f57b40016f0, may_block=may_block@entry=1) at gmain.c:3901
#33 0x00007f57d4feeeef in QEventDispatcherGlib::processEvents (this=0x55e221610260, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#34 0x00007f57d4f95f0a in QEventLoop::exec (this=this@entry=0x7fffa626b120, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#35 0x00007f57d4f9dfec in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#36 0x000055e22000a363 in main (argc=2, argv=<optimized out>) at ../../shell/main.cpp:176

Possible duplicates by query: bug 355489, bug 354884, bug 354409, bug 354402, bug 353723.

Reported using DrKonqi