Bug 354952

Application: systemsettings5 (5.4.1)

Qt Version: 5.4.2
Operating System: Linux 4.2.0-17-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- Unusual behavior I noticed: 
All windows becomes semi transparent for no reason it  happen's repetitively , have to log out and login again...

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 0x7f1c786b6800 (LWP 2439))]

Thread 2 (Thread 0x7f1c670f8700 (LWP 2440)):
#0  0x00007f1c74e528dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1c72b62bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f1c72b6474f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f1c69646a39 in QXcbEventReader::run (this=0x1657fa0) at qxcbconnection.cpp:1105
#4  0x00007f1c755452be in QThreadPrivate::start (arg=0x1657fa0) at thread/qthread_unix.cpp:337
#5  0x00007f1c722ed6aa in start_thread (arg=0x7f1c670f8700) at pthread_create.c:333
#6  0x00007f1c74e5deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f1c786b6800 (LWP 2439)):
[KCrash Handler]
#6  0x00007f1c73df4637 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f1c73da0383 in QV4::ExecutionEngine::~ExecutionEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f1c73ecd1b1 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f1c73ecd3c9 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f1c73d34e61 in QJSEngine::~QJSEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f1c73e34365 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f1c73e34429 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007f1c4e143152 in QScopedPointerDeleter<QQmlEngine>::cleanup (pointer=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:54
#14 QScopedPointer<QQmlEngine, QScopedPointerDeleter<QQmlEngine> >::reset (other=0x0, this=0x7f1c4e3cd728 <Aurorae::Helper::instance()::s_helper+8>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:149
#15 Aurorae::Helper::unref (this=0x7f1c4e3cd720 <Aurorae::Helper::instance()::s_helper>) at ../../../../clients/aurorae/src/aurorae.cpp:112
#16 0x00007f1c4e1470b8 in Aurorae::Helper::unref (this=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:274
#17 Aurorae::Decoration::~Decoration (this=0x4f4a300, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:269
#18 0x00007f1c4e1470d9 in Aurorae::Decoration::~Decoration (this=0x4f4a300, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:280
#19 0x00007f1c75756670 in QObject::event (this=0x4f4a300, e=<optimized out>) at kernel/qobject.cpp:1236
#20 0x00007f1c76ba8b8c in QApplicationPrivate::notify_helper (this=this@entry=0x163f800, receiver=receiver@entry=0x4f4a300, e=e@entry=0x37a5ca0) at kernel/qapplication.cpp:3720
#21 0x00007f1c76bae230 in QApplication::notify (this=0x7ffd1de325f0, receiver=0x4f4a300, e=0x37a5ca0) at kernel/qapplication.cpp:3503
#22 0x00007f1c75724f1b in QCoreApplication::notifyInternal (this=0x7ffd1de325f0, receiver=0x4f4a300, event=event@entry=0x37a5ca0) at kernel/qcoreapplication.cpp:935
#23 0x00007f1c75727057 in QCoreApplication::sendEvent (event=0x37a5ca0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x163ef60) at kernel/qcoreapplication.cpp:1552
#25 0x00007f1c75727588 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#26 0x00007f1c7577be73 in postEventSourceDispatch (s=0x167cde0) at kernel/qeventdispatcher_glib.cpp:271
#27 0x00007f1c71dcdff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f1c71dce250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f1c71dce2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f1c7577c27f in QEventDispatcherGlib::processEvents (this=0x1685bf0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#31 0x00007f1c7572275a in QEventLoop::exec (this=this@entry=0x7ffd1de324d0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#32 0x00007f1c7572a2cc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#33 0x00007f1c765f500c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#34 0x00007f1c76ba5025 in QApplication::exec () at kernel/qapplication.cpp:2956
#35 0x000000000040f04b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Possible duplicates by query: bug 351841, bug 351465, bug 351170, bug 351042, bug 350644.

Reported using DrKonqi