Bug 346272 - segmentation fault in window decoration settings
Summary: segmentation fault in window decoration settings
Status: RESOLVED DUPLICATE of bug 345660
Alias: None
Product: kwin
Classification: Plasma
Component: aurorae (show other bugs)
Version: 5.2.2
Platform: unspecified Linux
: NOR crash
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: drkonqi
Depends on:
Blocks:
 
Reported: 2015-04-16 17:53 UTC by Arne Claeys
Modified: 2015-05-01 13:20 UTC (History)
1 user (show)

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Version Fixed In:
Sentry Crash Report:

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Description Arne Claeys 2015-04-16 17:53:33 UTC 
Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-12-generic x86_64
Distribution: Ubuntu Vivid Vervet (development branch)

-- Information about the crash:
A segmentation fault occured when I scrolled down in the window decoration selection menu.

The crash can be reproduced every time.

-- Backtrace:
Application: Systeeminstellingen (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7fd97f59c780 (LWP 20753))]

Thread 7 (Thread 0x7fd96ce72700 (LWP 20754)):
#0  0x00007fd97bd1f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd97a039b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd97a03b64f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd96fc45099 in QXcbEventReader::run (this=0x99d150) at qxcbconnection.cpp:1105
#4  0x00007fd97c3a0b0e in QThreadPrivate::start (arg=0x99d150) at thread/qthread_unix.cpp:337
#5  0x00007fd978f536aa in start_thread (arg=0x7fd96ce72700) at pthread_create.c:333
#6  0x00007fd97bd2aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fd95f235700 (LWP 20757)):
#0  0x00007fd97bd1f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd978a34ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd978a35242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd9668f0ae6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fd978a5b955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd978f536aa in start_thread (arg=0x7fd95f235700) at pthread_create.c:333
#6  0x00007fd97bd2aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fd95ea34700 (LWP 20758)):
#0  0x00007fd97bd1b49d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd974ea7f45 in ?? () from /usr/lib/nvidia-340/tls/libnvidia-tls.so.340.76
#2  0x00007fd978a782f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd978a3496c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd978a34e60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd978a34fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fd978a35009 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fd978a5b955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fd978f536aa in start_thread (arg=0x7fd95ea34700) at pthread_create.c:333
#9  0x00007fd97bd2aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fd94c285700 (LWP 20759)):
#0  0x00007fd97bd1f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd978a34ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd978a34fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd97c637c6c in QEventDispatcherGlib::processEvents (this=0x7fd9440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fd97c5dc3e2 in QEventLoop::exec (this=this@entry=0x7fd94c284e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fd97c39bb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fd97b366f45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fd97c3a0b0e in QThreadPrivate::start (arg=0x10c98d0) at thread/qthread_unix.cpp:337
#8  0x00007fd978f536aa in start_thread (arg=0x7fd94c285700) at pthread_create.c:333
#9  0x00007fd97bd2aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fd94891f700 (LWP 20760)):
[KCrash Handler]
#6  0x00007fd97adeb625 in QSGOpaqueTextureMaterial::setTexture(QSGTexture*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fd97adead3c in QSGSimpleTextureNode::setTexture(QSGTexture*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fd94a751c9a in Plasma::FrameSvgItem::updatePaintNode (this=0x27074e0, oldNode=0x7fd93c729300) at ../../../../src/declarativeimports/core/framesvgitem.cpp:495
#9  0x00007fd97ae3e4bf in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fd97ae3f4cb in QQuickWindowPrivate::updateDirtyNodes() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fd97ae3fd80 in QQuickWindowPrivate::syncSceneGraph() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fd97ae111dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007fd97ae120a1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fd97ae13360 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fd97c3a0b0e in QThreadPrivate::start (arg=0x1672860) at thread/qthread_unix.cpp:337
#16 0x00007fd978f536aa in start_thread (arg=0x7fd94891f700) at pthread_create.c:333
#17 0x00007fd97bd2aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fd9433c8700 (LWP 20761)):
#0  0x00007fd978a79789 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd978a34e7e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd978a34fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd97c637c6c in QEventDispatcherGlib::processEvents (this=0x7fd9380008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fd97c5dc3e2 in QEventLoop::exec (this=this@entry=0x7fd9433c7e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fd97c39bb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fd97b366f45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fd97c3a0b0e in QThreadPrivate::start (arg=0x19ea800) at thread/qthread_unix.cpp:337
#8  0x00007fd978f536aa in start_thread (arg=0x7fd9433c8700) at pthread_create.c:333
#9  0x00007fd97bd2aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fd97f59c780 (LWP 20753)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd97c3a1c6b in wait (time=18446744073709551615, this=0xf15ab0) at thread/qwaitcondition_unix.cpp:128
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x16728a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:200
#3  0x00007fd97ae14c48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd97ae15cad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fd97d3cab2c in QApplicationPrivate::notify_helper (this=0x96f430, receiver=0x113ec20, e=0x7ffd916edb00) at kernel/qapplication.cpp:3720
#6  0x00007fd97d3d0000 in QApplication::notify (this=0x7ffd916ede70, receiver=0x113ec20, e=0x7ffd916edb00) at kernel/qapplication.cpp:3503
#7  0x00007fd97c5dec2b in QCoreApplication::notifyInternal (this=0x7ffd916ede70, receiver=0x113ec20, event=event@entry=0x7ffd916edb00) at kernel/qcoreapplication.cpp:935
#8  0x00007fd97c636ae5 in sendEvent (event=0x7ffd916edb00, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#9  QTimerInfoList::activateTimers (this=0x96b520) at kernel/qtimerinfo_unix.cpp:635
#10 0x00007fd97c636f61 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#11 0x00007fd978a34c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007fd978a34f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fd978a34fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007fd97c637c57 in QEventDispatcherGlib::processEvents (this=0x96b3a0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#15 0x00007fd97c5dc3e2 in QEventLoop::exec (this=this@entry=0x7ffd916edd50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#16 0x00007fd97c5e402c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#17 0x00007fd97ce0531c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#18 0x00007fd97d3c67a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#19 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi
Comment 1 Thomas Lübking 2015-04-16 19:53:25 UTC 
Looks like bug #345675, but QSGOpaqueTextureMaterial::setTexture is NOT the current thread here.
Comment 2 Martin Flöser 2015-04-17 06:12:34 UTC 
The backtrace is missing debug symbols for Qt5Quick where the actual crash occurs. In case you are able to reproduce, please install the debug symbols and upload a new crash trace.
Comment 3 Thomas Lübking 2015-04-17 07:30:20 UTC 
Whatever gets us there, it segfaults in pthread_cond_wait what would mean either
a) broken libthread
b) unlocked mutex delivered to pthread_cond_wait
c) segfault in other thread and pthread_cond_wait just randomly burps and receives it.

Given bug #345675, I bet on (c)
Comment 4 Arne Claeys 2015-04-17 12:42:35 UTC 
It seems the error only occurs when certain window decorations are installed. In my case glowglass-deco causes the problem.

Which package contains the right debug symbols for libQt5Quick.so.5?
I installed qtquick1-5-dbg, but there is still same information missing.

Application: Systeeminstellingen (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7fcecc57c780 (LWP 6828))]

Thread 6 (Thread 0x7fceac215700 (LWP 6832)):
#0  0x00007fcec8cff8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fcec5a14ebc in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fcea40010e0, timeout=-1, context=0x1397290) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4103
#2  0x00007fcec5a14ebc in g_main_context_iterate (context=0x1397290, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3803
#3  0x00007fcec5a15242 in g_main_loop_run (loop=0x13973d0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4002
#4  0x00007fceb3827ae6 in gdbus_shared_thread_func (user_data=0x1397260) at /build/buildd/glib2.0-2.44.0/./gio/gdbusprivate.c:274
#5  0x00007fcec5a3b955 in g_thread_proxy (data=0x13670a0) at /build/buildd/glib2.0-2.44.0/./glib/gthread.c:764
#6  0x00007fcec5f336aa in start_thread (arg=0x7fceac215700) at pthread_create.c:333
#7  0x00007fcec8d0aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fceaba14700 (LWP 6833)):
#0  0x00007fcec5a59789 in g_mutex_lock (mutex=mutex@entry=0x1191410) at /build/buildd/glib2.0-2.44.0/./glib/gthread-posix.c:1342
#1  0x00007fcec5a14641 in g_main_context_query (context=context@entry=0x1191410, max_priority=2147483647, timeout=timeout@entry=0x7fceaba13e54, fds=fds@entry=0x7fce9c0008c0, n_fds=n_fds@entry=2) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3512
#2  0x00007fcec5a14e37 in g_main_context_iterate (context=context@entry=0x1191410, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3790
#3  0x00007fcec5a14fcc in g_main_context_iteration (context=0x1191410, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#4  0x00007fcec5a15009 in glib_worker_main (data=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:5618
#5  0x00007fcec5a3b955 in g_thread_proxy (data=0x13672d0) at /build/buildd/glib2.0-2.44.0/./glib/gthread.c:764
#6  0x00007fcec5f336aa in start_thread (arg=0x7fceaba14700) at pthread_create.c:333
#7  0x00007fcec8d0aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fce9925b700 (LWP 6834)):
#0  0x00007fcec5a59780 in g_mutex_lock (mutex=mutex@entry=0x7fce94000990) at /build/buildd/glib2.0-2.44.0/./glib/gthread-posix.c:1342
#1  0x00007fcec5a14409 in g_main_context_prepare (context=context@entry=0x7fce94000990, priority=priority@entry=0x7fce9925ace0) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3412
#2  0x00007fcec5a14de8 in g_main_context_iterate (context=context@entry=0x7fce94000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3788
#3  0x00007fcec5a14fcc in g_main_context_iteration (context=0x7fce94000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#4  0x00007fcec9617c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fce940008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007fcec95bc3e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fce9925ae20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fcec937bb44 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fcec8346f65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fcec9380b0e in QThreadPrivate::start(void*) (arg=0x18d74d0) at thread/qthread_unix.cpp:337
#9  0x00007fcec5f336aa in start_thread (arg=0x7fce9925b700) at pthread_create.c:333
#10 0x00007fcec8d0aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fce918bc700 (LWP 6835)):
#0  0x00007fcec8cff8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fcec5a14ebc in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fce8c0023d0, timeout=-1, context=0x7fce8c000990) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:4103
#2  0x00007fcec5a14ebc in g_main_context_iterate (context=context@entry=0x7fce8c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3803
#3  0x00007fcec5a14fcc in g_main_context_iteration (context=0x7fce8c000990, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#4  0x00007fcec9617c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fce8c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007fcec95bc3e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fce918bbe20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fcec937bb44 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fcec8346f65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fcec9380b0e in QThreadPrivate::start(void*) (arg=0x1f42980) at thread/qthread_unix.cpp:337
#9  0x00007fcec5f336aa in start_thread (arg=0x7fce918bc700) at pthread_create.c:333
#10 0x00007fcec8d0aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fce8afe6700 (LWP 6836)):
[KCrash Handler]
#6  0x0000000000000070 in  ()
#7  0x00007fcec7dcb628 in QSGOpaqueTextureMaterial::setTexture(QSGTexture*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fcec7dcad3c in QSGSimpleTextureNode::setTexture(QSGTexture*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fce93baac9a in Plasma::FrameSvgItem::updatePaintNode(QSGNode*, QQuickItem::UpdatePaintNodeData*) (this=0x2722b30, oldNode=0x7fce84dbbcb0) at ../../../../src/declarativeimports/core/framesvgitem.cpp:495
#10 0x00007fcec7e1e4bf in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fcec7e1f4cb in QQuickWindowPrivate::updateDirtyNodes() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fcec7e1fd80 in QQuickWindowPrivate::syncSceneGraph() () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007fcec7df11dd in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fcec7df20a1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fcec7df3360 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007fcec9380b0e in QThreadPrivate::start(void*) (arg=0x2284300) at thread/qthread_unix.cpp:337
#17 0x00007fcec5f336aa in start_thread (arg=0x7fce8afe6700) at pthread_create.c:333
#18 0x00007fcec8d0aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fcecc57c780 (LWP 6828)):
#0  0x00007fcec5f38da0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fcec9381c6b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x1e9db00) at thread/qwaitcondition_unix.cpp:128
#2  0x00007fcec9381c6b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x2284340, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:200
#3  0x00007fcec7df4c48 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fcec7df5cad in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fceca3aab2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=0x11a8430, receiver=0x1a4b910, e=0x7fffd807c770) at kernel/qapplication.cpp:3720
#6  0x00007fceca3b0000 in QApplication::notify(QObject*, QEvent*) (this=0x7fffd807cae0, receiver=0x1a4b910, e=0x7fffd807c770) at kernel/qapplication.cpp:3503
#7  0x00007fcec95bec2b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7fffd807cae0, receiver=0x1a4b910, event=event@entry=0x7fffd807c770) at kernel/qcoreapplication.cpp:935
#8  0x00007fcec9616ae5 in QTimerInfoList::activateTimers() (event=0x7fffd807c770, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#9  0x00007fcec9616ae5 in QTimerInfoList::activateTimers() (this=0x1288860) at kernel/qtimerinfo_unix.cpp:635
#10 0x00007fcec9616f61 in timerSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#11 0x00007fcec5a14c3d in g_main_context_dispatch (context=0x7fceb4001710) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3122
#12 0x00007fcec5a14c3d in g_main_context_dispatch (context=context@entry=0x7fceb4001710) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3737
#13 0x00007fcec5a14f20 in g_main_context_iterate (context=context@entry=0x7fceb4001710, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3808
#14 0x00007fcec5a14fcc in g_main_context_iteration (context=0x7fceb4001710, may_block=1) at /build/buildd/glib2.0-2.44.0/./glib/gmain.c:3869
#15 0x00007fcec9617c57 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x11a4650, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#16 0x00007fcec95bc3e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fffd807c9c0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#17 0x00007fcec95c402c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1188
#18 0x00007fcec9de531c in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1510
#19 0x00007fceca3a67a5 in QApplication::exec() () at kernel/qapplication.cpp:2956
#20 0x000000000040eebc in main(int, char**) (argc=1, argv=<optimized out>) at ../../app/main.cpp:54
Comment 5 Thomas Lübking 2015-04-17 13:37:37 UTC 
(In reply to Arne Claeys from comment #4)
> It seems the error only occurs when certain window decorations are
> installed. In my case glowglass-deco causes the problem.

Which one? I see 6 glowglass-* decorations.
Comment 7 Thomas Lübking 2015-04-17 13:51:01 UTC 
Deco is certainly problematic (black/invalid background) and I get a crash-on-exit

#0  0xb7fdcbbc in __kernel_vsyscall ()
#1  0xb537e26b in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#2  0xb585f4a6 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libc.so.6
#3  0xb5b0e64c in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQt5Core.so.5
#4  0xae504274 in ?? () from /usr/lib/libQt5Quick.so.5
#5  0xae5048e5 in ?? () from /usr/lib/libQt5Quick.so.5
#6  0xae5315e6 in QQuickWindow::~QQuickWindow() () from /usr/lib/libQt5Quick.so.5
#7  0xae5e66c7 in QQuickView::~QQuickView() () from /usr/lib/libQt5Quick.so.5
#8  0xae5e66fa in QQuickView::~QQuickView() () from /usr/lib/libQt5Quick.so.5
#9  0xb661f1fe in QWindowContainer::~QWindowContainer() () from /usr/lib/libQt5Widgets.so.5
#10 0xb661f23a in QWindowContainer::~QWindowContainer() () from /usr/lib/libQt5Widgets.so.5
#11 0xb5d12d5c in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#12 0xb65fce4d in QWidget::~QWidget() () from /usr/lib/libQt5Widgets.so.5
#13 0xb65fd10a in QWidget::~QWidget() () from /usr/lib/libQt5Widgets.so.5
#14 0xb5d12d5c in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#15 0xb65fce4d in QWidget::~QWidget() () from /usr/lib/libQt5Widgets.so.5
#16 0xae94ede1 in KDecoration2::Configuration::ConfigurationForm::~ConfigurationForm() () from /opt/kwin_master/lib/plugins/kcm_kwindecoration.so
#17 0xae94ee27 in KDecoration2::Configuration::ConfigurationForm::~ConfigurationForm() () from /opt/kwin_master/lib/plugins/kcm_kwindecoration.so
#18 0xb5d12d5c in QObjectPrivate::deleteChildren() () from /usr/lib/libQt5Core.so.5
#19 0xb65fce4d in QWidget::~QWidget() () from /usr/lib/libQt5Widgets.so.5
#20 0xb72b1e39 in KCModule::~KCModule() () from /usr/lib/libKF5ConfigWidgets.so.5

The other two threads are dormant, stack of thread 4 is empty.
Uninstalling the theme crashed the kcm, afterwards operation was back to normal.
Comment 8 Martin Flöser 2015-04-17 14:58:37 UTC 
@David: you had a look at the systemsettings crash at exiting deco kcms IIRC?
Comment 10 Martin Flöser 2015-04-18 08:01:07 UTC 
ohhh threaded render loop. That might explain why I never hit the crash
Comment 11 Thomas Lübking 2015-05-01 13:20:02 UTC 
Optimistically marking as dupe.

*** This bug has been marked as a duplicate of bug 345660 ***