Application: plasmashell (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-11-generic x86_64
Distribution: Ubuntu 15.04

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

on the sddm login screen, both displays (laptop internal, external hdmi) are displayed and mirrored. once i login, the upper display goes black, and the lower one shows the crash.

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 0x7f5d02c557c0 (LWP 2433))]

Thread 3 (Thread 0x7f5ce77fe700 (LWP 2453)):
#0  0x00007f5cfe0809ca in testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x15ae028: 0x1) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  testAndSetAcquire<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x15ae028: 0x1) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:166
#2  testAndSetAcquire (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, this=0x15ae028, this@entry=0x1) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:270
#3  fastTryLock (current=<synthetic pointer>, this=0x15ae028, this@entry=0x1) at thread/qmutex.h:82
#4  QMutex::lock (this=this@entry=0x15ae028) at thread/qmutex.cpp:212
#5  0x00007f5cfe31f1db in QMutexLocker (m=0x15ae028, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:128
#6  canWaitLocked (this=0x15ae000) at ../../include/QtCore/5.4.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:243
#7  postEventSourcePrepare (s=0x7f5cd80012d0, timeout=0x7f5ce77fdc14) at kernel/qeventdispatcher_glib.cpp:254
#8  0x00007f5cfa1133fd in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f5cfa113de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f5cfa113fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f5cfe31fc6c in QEventDispatcherGlib::processEvents (this=0x7f5cd80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#12 0x00007f5cfe2c43e2 in QEventLoop::exec (this=this@entry=0x7f5ce77fdde0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#13 0x00007f5cfe083b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#14 0x00007f5cffe11f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007f5cfe088b0e in QThreadPrivate::start (arg=0x15a8a50) at thread/qthread_unix.cpp:337
#16 0x00007f5cfd28e6aa in start_thread (arg=0x7f5ce77fe700) at pthread_create.c:333
#17 0x00007f5cfda12eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f5cd7fff700 (LWP 2478)):
#0  0x00007f5cfda0349d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5cfa1572f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5cfa11396c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5cfa113e60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f5cfa113fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f5cfe31fc6c in QEventDispatcherGlib::processEvents (this=0x7f5cd00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#6  0x00007f5cfe2c43e2 in QEventLoop::exec (this=this@entry=0x7f5cd7ffede0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f5cfe083b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#8  0x00007f5cffe11f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f5cfe088b0e in QThreadPrivate::start (arg=0x1f30e10) at thread/qthread_unix.cpp:337
#10 0x00007f5cfd28e6aa in start_thread (arg=0x7f5cd7fff700) at pthread_create.c:333
#11 0x00007f5cfda12eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f5d02c557c0 (LWP 2433)):
[KCrash Handler]
#6  KScreen::Config::connectedOutputs (this=0x0) at ../../src/config.cpp:196
#7  0x00000000004535c5 in ShellCorona::reconsiderOutputs() ()
#8  0x00007f5cfe2f735a in call (a=0x7ffd167bbe90, r=0x159fca0, this=0x15b3880) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#9  QMetaObject::activate (sender=sender@entry=0x159fd88, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3702
#10 0x00007f5cfe2f8057 in QMetaObject::activate (sender=sender@entry=0x159fd88, m=m@entry=0x7f5cfe521580 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#11 0x00007f5cfe377610 in QTimer::timeout (this=this@entry=0x159fd88) at .moc/moc_qtimer.cpp:192
#12 0x00007f5cfe305918 in QTimer::timerEvent (this=0x159fd88, e=<optimized out>) at kernel/qtimer.cpp:247
#13 0x00007f5cfe2f86f3 in QObject::event (this=0x159fd88, e=<optimized out>) at kernel/qobject.cpp:1267
#14 0x00007f5cfebd0b2c in QApplicationPrivate::notify_helper (this=0x14cf510, receiver=0x159fd88, e=0x7ffd167bc200) at kernel/qapplication.cpp:3720
#15 0x00007f5cfebd6000 in QApplication::notify (this=0x7ffd167bc5d0, receiver=0x159fd88, e=0x7ffd167bc200) at kernel/qapplication.cpp:3503
#16 0x00007f5cfe2c6c2b in QCoreApplication::notifyInternal (this=0x7ffd167bc5d0, receiver=0x159fd88, event=event@entry=0x7ffd167bc200) at kernel/qcoreapplication.cpp:935
#17 0x00007f5cfe31eae5 in sendEvent (event=0x7ffd167bc200, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#18 QTimerInfoList::activateTimers (this=0x1502840) at kernel/qtimerinfo_unix.cpp:635
#19 0x00007f5cfe31ef61 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#20 0x00007f5cfa113c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f5cfa113f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f5cfa113fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f5cfe31fc57 in QEventDispatcherGlib::processEvents (this=0x1502f50, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#24 0x00007f5cfe2c43e2 in QEventLoop::exec (this=this@entry=0x7ffd167bc450, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#25 0x00007f5cfe2cc02c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#26 0x000000000042fd9b in main ()

Reported using DrKonqi