(In reply to Philip Collins from comment #0)
> Application: systemsettings5 (5.2.2)
> 
> Qt Version: 5.4.1
> Operating System: Linux 3.19.0-15-generic x86_64
> Distribution: Ubuntu 15.04
> 
> -- Information about the crash:
> Selected System Settings> Application Style > Window Decorations.
> Immediate crash.
> 
> 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 0x7fd570bc6780 (LWP 2904))]
> 
> Thread 6 (Thread 0x7fd55e3f1700 (LWP 2905)):
> #0  0x00007fd56d3298dd in poll () at ../sysdeps/unix/syscall-template.S:81
> #1  0x00007fd56b643b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
> #2  0x00007fd56b64564f in xcb_wait_for_event () from
> /usr/lib/x86_64-linux-gnu/libxcb.so.1
> #3  0x00007fd561184099 in QXcbEventReader::run (this=0xc52950) at
> qxcbconnection.cpp:1105
> #4  0x00007fd56d9aab0e in QThreadPrivate::start (arg=0xc52950) at
> thread/qthread_unix.cpp:337
> #5  0x00007fd56a55d6aa in start_thread (arg=0x7fd55e3f1700) at
> pthread_create.c:333
> #6  0x00007fd56d334eed in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> 
> Thread 5 (Thread 0x7fd53755d700 (LWP 2946)):
> #0  0x00007fd56a083780 in g_mutex_lock () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #1  0x00007fd56a03e409 in g_main_context_prepare () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #2  0x00007fd56a03ede8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #3  0x00007fd56a03efcc in g_main_context_iteration () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #4  0x00007fd56dc41c6c in QEventDispatcherGlib::processEvents
> (this=0x7fd52c0d7ae0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
> #5  0x00007fd56dbe63e2 in QEventLoop::exec (this=this@entry=0x7fd53755ce40,
> flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
> #6  0x00007fd56d9a5b44 in QThread::exec (this=<optimized out>) at
> thread/qthread.cpp:503
> #7  0x00007fd56d9aab0e in QThreadPrivate::start (arg=0x2375630) at
> thread/qthread_unix.cpp:337
> #8  0x00007fd56a55d6aa in start_thread (arg=0x7fd53755d700) at
> pthread_create.c:333
> #9  0x00007fd56d334eed in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> 
> Thread 4 (Thread 0x7fd53d71b700 (LWP 2997)):
> #0  0x00007fd56d3298dd in poll () at ../sysdeps/unix/syscall-template.S:81
> #1  0x00007fd56a03eebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #2  0x00007fd56a03efcc in g_main_context_iteration () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #3  0x00007fd56dc41c6c in QEventDispatcherGlib::processEvents
> (this=0x7fd530107c80, flags=...) at kernel/qeventdispatcher_glib.cpp:418
> #4  0x00007fd56dbe63e2 in QEventLoop::exec (this=this@entry=0x7fd53d71ae20,
> flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
> #5  0x00007fd56d9a5b44 in QThread::exec (this=<optimized out>) at
> thread/qthread.cpp:503
> #6  0x00007fd56c970f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
> #7  0x00007fd56d9aab0e in QThreadPrivate::start (arg=0x201e630) at
> thread/qthread_unix.cpp:337
> #8  0x00007fd56a55d6aa in start_thread (arg=0x7fd53d71b700) at
> pthread_create.c:333
> #9  0x00007fd56d334eed in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> 
> Thread 3 (Thread 0x7fd53ffff700 (LWP 2998)):
> #0  0x00007fd56a03e842 in g_main_context_check () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #1  0x00007fd56a03ee60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #2  0x00007fd56a03efcc in g_main_context_iteration () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #3  0x00007fd56dc41c6c in QEventDispatcherGlib::processEvents
> (this=0x7fd5380db3d0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
> #4  0x00007fd56dbe63e2 in QEventLoop::exec (this=this@entry=0x7fd53fffee20,
> flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
> #5  0x00007fd56d9a5b44 in QThread::exec (this=<optimized out>) at
> thread/qthread.cpp:503
> #6  0x00007fd56c970f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
> #7  0x00007fd56d9aab0e in QThreadPrivate::start (arg=0x163a540) at
> thread/qthread_unix.cpp:337
> #8  0x00007fd56a55d6aa in start_thread (arg=0x7fd53ffff700) at
> pthread_create.c:333
> #9  0x00007fd56d334eed in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> 
> Thread 2 (Thread 0x7fd52bfff700 (LWP 2999)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007fd56d9abc6b in wait (time=18446744073709551615, this=0x1bcf740)
> at thread/qwaitcondition_unix.cpp:128
> #2  QWaitCondition::wait (this=<optimized out>, mutex=0x1340d80,
> time=18446744073709551615) at thread/qwaitcondition_unix.cpp:200
> #3  0x00007fd56c41cfab in ?? () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #4  0x00007fd56c41d3a0 in ?? () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #5  0x00007fd56d9aab0e in QThreadPrivate::start (arg=0x1340d00) at
> thread/qthread_unix.cpp:337
> #6  0x00007fd56a55d6aa in start_thread (arg=0x7fd52bfff700) at
> pthread_create.c:333
> #7  0x00007fd56d334eed in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> 
> Thread 1 (Thread 0x7fd570bc6780 (LWP 2904)):
> [KCrash Handler]
> #6  0x00007fd56d5f2cf8 in main_arena () from /lib/x86_64-linux-gnu/libc.so.6
> #7  0x00007fd5473266e1 in KDecoration2::Decoration::update(QRect const&) ()
> from /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
> #8  0x00007fd54732675b in KDecoration2::Decoration::update() () from
> /usr/lib/x86_64-linux-gnu/libkdecorations2.so.5
> #9  0x00007fd5445c9370 in Breeze::Decoration::setOpacity
> (this=this@entry=0x2747d80, value=<optimized out>) at
> ../../kdecoration/breezedecoration.cpp:92
> #10 0x00007fd5445e97a8 in Breeze::Decoration::qt_metacall (this=0x2747d80,
> _c=QMetaObject::WriteProperty, _id=0, _a=0x7ffc16cd99d0) at
> moc_breezedecoration.cpp:146
> #11 0x00007fd56d98b5ca in updateProperty (newValue=..., this=0x2390e50) at
> animation/qpropertyanimation.cpp:135
> #12 QPropertyAnimation::updateCurrentValue (this=<optimized out>, value=...)
> at animation/qpropertyanimation.cpp:242
> #13 0x00007fd56d986f48 in
> QVariantAnimationPrivate::setCurrentValueForProgress
> (this=this@entry=0x2390e50, progress=progress@entry=0.96444444444444444) at
> animation/qvariantanimation.cpp:290
> #14 0x00007fd56d987d1b in recalculateCurrentInterval (force=false,
> this=0x2390e50) at animation/qvariantanimation.cpp:275
> #15 QVariantAnimation::updateCurrentTime (this=<optimized out>) at
> animation/qvariantanimation.cpp:693
> #16 0x00007fd56d983baf in QAbstractAnimation::setCurrentTime
> (this=0x15ac8e0, msecs=130) at animation/qabstractanimation.cpp:1321
> #17 0x00007fd56d983e96 in updateAnimationsTime (delta=20, this=0xdf3250) at
> animation/qabstractanimation.cpp:606
> #18 QUnifiedTimer::updateAnimationTimers (this=0xefb1a0) at
> animation/qabstractanimation.cpp:323
> #19 0x00007fd56d9847dc in QAnimationDriver::advanceAnimation
> (this=<optimized out>, timeStep=-1) at animation/qabstractanimation.cpp:820
> #20 0x00007fd56c4011ee in ?? () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #21 0x00007fd56c41f68a in ?? () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #22 0x00007fd56c421a8b in ?? () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #23 0x00007fd56c42230a in ?? () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #24 0x00007fd56e4207b5 in QWindow::event (this=0x15e8a00, ev=<optimized
> out>) at kernel/qwindow.cpp:2051
> #25 0x00007fd56c453dd3 in QQuickWindow::event(QEvent*) () from
> /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
> #26 0x00007fd56e9d4b2c in QApplicationPrivate::notify_helper (this=0xc24550,
> receiver=0x15e8a00, e=0x7ffc16cda130) at kernel/qapplication.cpp:3720
> #27 0x00007fd56e9da000 in QApplication::notify (this=0x7ffc16cda530,
> receiver=0x15e8a00, e=0x7ffc16cda130) at kernel/qapplication.cpp:3503
> #28 0x00007fd56dbe8c2b in QCoreApplication::notifyInternal
> (this=0x7ffc16cda530, receiver=receiver@entry=0x15e8a00,
> event=event@entry=0x7ffc16cda130) at kernel/qcoreapplication.cpp:935
> #29 0x00007fd56e418e86 in sendSpontaneousEvent (event=0x7ffc16cda130,
> receiver=0x15e8a00) at
> ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
> #30 QGuiApplicationPrivate::processExposeEvent (e=0x154d780) at
> kernel/qguiapplication.cpp:2613
> #31 0x00007fd56e419bbd in QGuiApplicationPrivate::processWindowSystemEvent
> (e=e@entry=0x154d780) at kernel/qguiapplication.cpp:1638
> #32 0x00007fd56e3fe34f in QWindowSystemInterface::sendWindowSystemEvents
> (flags=...) at kernel/qwindowsysteminterface.cpp:572
> #33 0x00007fd5611ae590 in userEventSourceDispatch (source=<optimized out>)
> at eventdispatchers/qeventdispatcher_glib.cpp:70
> #34 0x00007fd56a03ec3d in g_main_context_dispatch () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #35 0x00007fd56a03ef20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #36 0x00007fd56a03efcc in g_main_context_iteration () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #37 0x00007fd56dc41c57 in QEventDispatcherGlib::processEvents
> (this=0xca7960, flags=...) at kernel/qeventdispatcher_glib.cpp:418
> #38 0x00007fd56dbe63e2 in QEventLoop::exec (this=this@entry=0x7ffc16cda410,
> flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
> #39 0x00007fd56dbee02c in QCoreApplication::exec () at
> kernel/qcoreapplication.cpp:1188
> #40 0x00007fd56e40f31c in QGuiApplication::exec () at
> kernel/qguiapplication.cpp:1510
> #41 0x00007fd56e9d07a5 in QApplication::exec () at
> kernel/qapplication.cpp:2956
> #42 0x000000000040eebc in main (argc=1, argv=<optimized out>) at
> ../../app/main.cpp:54
> 
> Reported using DrKonqi

*** This bug has been marked as a duplicate of bug 346863 ***