Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-25-generic x86_64
Distribution: Ubuntu 15.04

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

- currently using the default "Breeze" window decorations theme
- want to change the font for the window title and/or change to different theme
- crashes as soon as I switch to the "Window Decorations" configuration option

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".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7fd6444cd780 (LWP 2861))]

Thread 7 (Thread 0x7fd631cd8700 (LWP 2862)):
#0  0x00007fd640c3f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd63ef59b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd63ef5b64f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd634a9a099 in QXcbEventReader::run (this=0x1e7aa80) at qxcbconnection.cpp:1105
#4  0x00007fd6412c0b0e in QThreadPrivate::start (arg=0x1e7aa80) at thread/qthread_unix.cpp:337
#5  0x00007fd63de736aa in start_thread (arg=0x7fd631cd8700) at pthread_create.c:333
#6  0x00007fd640c4aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fd6242ae700 (LWP 2866)):
#0  0x00007fd640c3f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd63d954ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd63d955242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd62b602af6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fd63d97b955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd63de736aa in start_thread (arg=0x7fd6242ae700) at pthread_create.c:333
#6  0x00007fd640c4aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fd623aad700 (LWP 2867)):
#0  0x00007fd640c3f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd63d954ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd63d954fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd63d955009 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd63d97b955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd63de736aa in start_thread (arg=0x7fd623aad700) at pthread_create.c:333
#6  0x00007fd640c4aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fd622d9f700 (LWP 2870)):
#0  isEmpty (this=0x7fd6180022d0) at ../../include/QtCore/../../src/corelib/tools/qlist.h:93
#1  isEmpty (this=0x7fd6180022d0) at ../../include/QtCore/../../src/corelib/tools/qlist.h:158
#2  timerSourceCheckHelper (src=0x7fd618002270) at kernel/qeventdispatcher_glib.cpp:137
#3  timerSourceCheck (source=0x7fd618002270) at kernel/qeventdispatcher_glib.cpp:168
#4  0x00007fd63d9548c1 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd63d954e60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fd63d954fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fd641557c6c in QEventDispatcherGlib::processEvents (this=0x7fd6180015e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#8  0x00007fd6414fc3e2 in QEventLoop::exec (this=this@entry=0x7fd622d9ee20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#9  0x00007fd6412bbb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#10 0x00007fd640286f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fd6412c0b0e in QThreadPrivate::start (arg=0x2666f80) at thread/qthread_unix.cpp:337
#12 0x00007fd63de736aa in start_thread (arg=0x7fd622d9f700) at pthread_create.c:333
#13 0x00007fd640c4aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fd604688700 (LWP 2871)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007fd63fd0b628 in QSGOpaqueTextureMaterial::setTexture(QSGTexture*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fd63fd0ad3c in QSGSimpleTextureNode::setTexture(QSGTexture*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fd6064c5c9a in Plasma::FrameSvgItem::updatePaintNode (this=0x3503390, oldNode=0x7fd5fcbb7d90) at ../../../../src/declarativeimports/core/framesvgitem.cpp:495
#10 0x00007fd63fd5e4bf in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fd63fd5f4cb in QQuickWindowPrivate::updateDirtyNodes() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fd63fd5fd80 in QQuickWindowPrivate::syncSceneGraph() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007fd63fd311dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fd63fd320a1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fd63fd33360 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007fd6412c0b0e in QThreadPrivate::start (arg=0x2a96060) at thread/qthread_unix.cpp:337
#17 0x00007fd63de736aa in start_thread (arg=0x7fd604688700) at pthread_create.c:333
#18 0x00007fd640c4aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fd603e67700 (LWP 2872)):
#0  idleTimerSourcePrepare (source=<optimized out>, timeout=0x7fd603e66c54) at kernel/qeventdispatcher_glib.cpp:197
#1  0x00007fd63d9543fd in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd63d954de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd63d954fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd641557c6c in QEventDispatcherGlib::processEvents (this=0x7fd5f40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007fd6414fc3e2 in QEventLoop::exec (this=this@entry=0x7fd603e66e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fd6412bbb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fd640286f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fd6412c0b0e in QThreadPrivate::start (arg=0x2e3dd50) at thread/qthread_unix.cpp:337
#9  0x00007fd63de736aa in start_thread (arg=0x7fd603e67700) at pthread_create.c:333
#10 0x00007fd640c4aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fd6444cd780 (LWP 2861)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6412c1c6b in wait (time=18446744073709551615, this=0x25bcc30) at thread/qwaitcondition_unix.cpp:128
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x2a960a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:200
#3  0x00007fd63fd34c48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd63fd35cad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fd6422eab2c in QApplicationPrivate::notify_helper (this=0x1e4d550, receiver=0x23a0250, e=0x7ffc61a52ff0) at kernel/qapplication.cpp:3720
#6  0x00007fd6422f0000 in QApplication::notify (this=0x7ffc61a53360, receiver=0x23a0250, e=0x7ffc61a52ff0) at kernel/qapplication.cpp:3503
#7  0x00007fd6414fec2b in QCoreApplication::notifyInternal (this=0x7ffc61a53360, receiver=0x23a0250, event=event@entry=0x7ffc61a52ff0) at kernel/qcoreapplication.cpp:935
#8  0x00007fd641556ae5 in sendEvent (event=0x7ffc61a52ff0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#9  QTimerInfoList::activateTimers (this=0x1f2ec80) at kernel/qtimerinfo_unix.cpp:635
#10 0x00007fd641556f61 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#11 0x00007fd63d954c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007fd63d954f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fd63d954fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007fd641557c57 in QEventDispatcherGlib::processEvents (this=0x1e498c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#15 0x00007fd6414fc3e2 in QEventLoop::exec (this=this@entry=0x7ffc61a53240, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#16 0x00007fd64150402c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#17 0x00007fd641d2531c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#18 0x00007fd6422e67a5 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