Bug 351749

Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-23-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
	I have a 3 monitor setup- system woke up from being asleep with screens off with only one display working.  Went into settings/display to have it look for more monitors, crashes when I open it.  
- Unusual behavior I noticed:
	systems crashes when trying open system settings/display and monitor
- Custom settings of the application:
	I have three monitors

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f73b9fbd780 (LWP 28450))]

Thread 3 (Thread 0x7f73aa82a700 (LWP 28451)):
#0  0x00007f73b67288dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f73b4a42b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f73b4a4464f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f73ad5bd099 in QXcbEventReader::run (this=0x25eb910) at qxcbconnection.cpp:1105
#4  0x00007f73b6da9b0e in QThreadPrivate::start (arg=0x25eb910) at thread/qthread_unix.cpp:337
#5  0x00007f73b395c6aa in start_thread (arg=0x7f73aa82a700) at pthread_create.c:333
#6  0x00007f73b6733eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f736d1fd700 (LWP 28471)):
#0  0x00007f73b672a0b7 in ioctl () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f739c33a919 in uki_firegl_MicroSleep () from /usr/lib/libatiuki.so.1
#2  0x00007f739e26f920 in ?? () from /usr/lib/dri/fglrx_dri.so
#3  0x00007f739da00d72 in ?? () from /usr/lib/dri/fglrx_dri.so
#4  0x00007f739da00dc5 in ?? () from /usr/lib/dri/fglrx_dri.so
#5  0x00007f73b395c6aa in start_thread (arg=0x7f736d1fd700) at pthread_create.c:333
#6  0x00007f73b6733eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f73b9fbd780 (LWP 28450)):
[KCrash Handler]
#6  0x00007f73b5831d7e in QQuickItemPrivate::addToDirtyList() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f73b5831e28 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f73b583c045 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f73b701973a in QObject::event (this=0x2f86a40, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f73b583ab6b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f73b7dd3b2c in QApplicationPrivate::notify_helper (this=0x25d2e70, receiver=0x2f86a40, e=0x7f73440d8db0) at kernel/qapplication.cpp:3720
#12 0x00007f73b7dd9000 in QApplication::notify (this=0x7ffd943b11d0, receiver=0x2f86a40, e=0x7f73440d8db0) at kernel/qapplication.cpp:3503
#13 0x00007f73b6fe7c2b in QCoreApplication::notifyInternal (this=0x7ffd943b11d0, receiver=0x2f86a40, event=event@entry=0x7f73440d8db0) at kernel/qcoreapplication.cpp:935
#14 0x00007f73b6fe9c9b in sendEvent (event=0x7f73440d8db0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#15 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x25d20c0) at kernel/qcoreapplication.cpp:1552
#16 0x00007f73b6fea298 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#17 0x00007f73b7040843 in postEventSourceDispatch (s=0x2622d10) at kernel/qeventdispatcher_glib.cpp:271
#18 0x00007f73b343dc3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f73b343df20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f73b343dfcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f73b7040c57 in QEventDispatcherGlib::processEvents (this=0x2615450, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f73b6fe53e2 in QEventLoop::exec (this=this@entry=0x7ffd943b10b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f73b6fed02c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#24 0x00007f73b780e31c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#25 0x00007f73b7dcf7a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#26 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi