Application: plasmashell (5.3.90)

Qt Version: 5.5.0
Operating System: Linux 4.1.0-gentoo x86_64
Distribution (Platform): Gentoo Packages

-- Information about the crash:
first i modified screen settings -> crash. After that i tried to log out -> crash. There are errors in System settings / monitor for some weeks now. until yesterday or so only one screen is working. now all work well but i get these crashes

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4c6fba37c0 (LWP 4186))]

Thread 15 (Thread 0x7f4c59b58700 (LWP 4188)):
#0  0x00007f4c6a31598d in poll () from /lib64/libc.so.6
#1  0x00007f4c6e38397a in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007f4c6e3853a7 in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007f4c5badee69 in QXcbEventReader::run (this=0x7019e0) at qxcbconnection.cpp:1197
#4  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x7019e0) at thread/qthread_unix.cpp:331
#5  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7f4c52930700 (LWP 4190)):
#0  0x00007f4c6a32a53f in ?? () from /lib64/libc.so.6
#1  0x00007f4c6a315982 in poll () from /lib64/libc.so.6
#2  0x00007f4c65ef212c in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f4c4c003070, timeout=-1, context=0x7f4c4c000990) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:4103
#3  g_main_context_iterate (context=context@entry=0x7f4c4c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3803
#4  0x00007f4c65ef223c in g_main_context_iteration (context=0x7f4c4c000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3869
#5  0x00007f4c6abc7aec in QEventDispatcherGlib::processEvents (this=0x7f4c4c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#6  0x00007f4c6ab6e6a2 in QEventLoop::exec (this=this@entry=0x7f4c5292fde0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f4c6a982164 in QThread::exec (this=this@entry=0x7d84c0) at thread/qthread.cpp:503
#8  0x00007f4c6d221275 in QQmlThreadPrivate::run (this=0x7d84c0) at qml/ftw/qqmlthread.cpp:141
#9  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x7d84c0) at thread/qthread_unix.cpp:331
#10 0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7f4c4a758700 (LWP 4191)):
#0  0x00007f4c6a31598d in poll () from /lib64/libc.so.6
#1  0x00007f4c65ef212c in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f4c44003270, timeout=-1, context=0x7f4c44000990) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:4103
#2  g_main_context_iterate (context=context@entry=0x7f4c44000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3803
#3  0x00007f4c65ef223c in g_main_context_iteration (context=0x7f4c44000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f4c6abc7aec in QEventDispatcherGlib::processEvents (this=0x7f4c440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f4c6ab6e6a2 in QEventLoop::exec (this=this@entry=0x7f4c4a757de0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4c6a982164 in QThread::exec (this=this@entry=0xa52e30) at thread/qthread.cpp:503
#7  0x00007f4c6d221275 in QQmlThreadPrivate::run (this=0xa52e30) at qml/ftw/qqmlthread.cpp:141
#8  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0xa52e30) at thread/qthread_unix.cpp:331
#9  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7f4c48d68700 (LWP 4194)):
#0  g_mutex_unlock (mutex=0x7f4c3c000990) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gthread-posix.c:1348
#1  0x00007f4c65ef2246 in g_main_context_iteration (context=0x7f4c3c000990, may_block=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3870
#2  0x00007f4c6abc7aec in QEventDispatcherGlib::processEvents (this=0x7f4c3c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#3  0x00007f4c6ab6e6a2 in QEventLoop::exec (this=this@entry=0x7f4c48d67de0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007f4c6a982164 in QThread::exec (this=this@entry=0xc2d050) at thread/qthread.cpp:503
#5  0x00007f4c6d221275 in QQmlThreadPrivate::run (this=0xc2d050) at qml/ftw/qqmlthread.cpp:141
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0xc2d050) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7f4c43398700 (LWP 4195)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6f5eee44 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f4c6f6dae40 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f4c6f5eee89 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7f4bbbfff700 (LWP 4196)):
#0  g_mutex_unlock (mutex=0x7f4bb4000990) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gthread-posix.c:1348
#1  0x00007f4c65ef1cb2 in g_main_context_dispatch (context=context@entry=0x7f4bb4000990) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3740
#2  0x00007f4c65ef2190 in g_main_context_iterate (context=context@entry=0x7f4bb4000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3808
#3  0x00007f4c65ef223c in g_main_context_iteration (context=0x7f4bb4000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3869
#4  0x00007f4c6abc7aec in QEventDispatcherGlib::processEvents (this=0x7f4bb40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f4c6ab6e6a2 in QEventLoop::exec (this=this@entry=0x7f4bbbffed90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4c6a982164 in QThread::exec (this=this@entry=0xe97190) at thread/qthread.cpp:503
#7  0x00007f4c6dbbe726 in QQuickPixmapReader::run (this=0xe97190) at util/qquickpixmapcache.cpp:754
#8  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0xe97190) at thread/qthread_unix.cpp:331
#9  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7f4bb906f700 (LWP 4197)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0xd38680) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0xda51d8, mutex=mutex@entry=0xda51d0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0xda51c8) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0xda5150) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0xda5150) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0xda5150) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7f4ba5fe6700 (LWP 4198)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0xf48470) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0xf5c108, mutex=mutex@entry=0xf5c100, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0xf5c0f8) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0xf5c080) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0xf5c080) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0xf5c080) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7f4b9d5c8700 (LWP 4199)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0x14eaca0) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0x1763788, mutex=mutex@entry=0x1763780, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0x1763778) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0x1763700) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0x1763700) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x1763700) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f4b97fff700 (LWP 4201)):
#0  0x00007fffe73a38d9 in ?? ()
#1  0x00007fffe73a3b0c in clock_gettime ()
#2  0x00007f4c6a32ab6d in clock_gettime () from /lib64/libc.so.6
#3  0x00007f4c6aa389b6 in qt_clock_gettime (ts=0x7f4b97ffeb30, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#4  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#5  qt_gettime () at tools/qelapsedtimer_unix.cpp:165
#6  0x00007f4c6abc5629 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f4b8c002cd0) at kernel/qtimerinfo_unix.cpp:84
#7  0x00007f4c6abc5b7d in QTimerInfoList::timerWait (this=0x7f4b8c002cd0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#8  0x00007f4c6abc71dc in timerSourcePrepareHelper (timeout=0x7f4b97ffebf4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#9  idleTimerSourcePrepare (source=<optimized out>, timeout=timeout@entry=0x7f4b97ffebf4) at kernel/qeventdispatcher_glib.cpp:207
#10 0x00007f4c65ef169c in g_main_context_prepare (context=context@entry=0x7f4b8c000990, priority=priority@entry=0x7f4b97ffec80) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3410
#11 0x00007f4c65ef2058 in g_main_context_iterate (context=context@entry=0x7f4b8c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3788
#12 0x00007f4c65ef223c in g_main_context_iteration (context=0x7f4b8c000990, may_block=1) at /var/tmp/portage/dev-libs/glib-2.44.1/work/glib-2.44.1/glib/gmain.c:3869
#13 0x00007f4c6abc7aec in QEventDispatcherGlib::processEvents (this=0x7f4b8c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#14 0x00007f4c6ab6e6a2 in QEventLoop::exec (this=this@entry=0x7f4b97ffedc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#15 0x00007f4c6a982164 in QThread::exec (this=this@entry=0x1c06940) at thread/qthread.cpp:503
#16 0x00007f4ba7783667 in KCupsConnection::run (this=0x1c06940) at /var/tmp/portage/kde-apps/print-manager-9999/work/print-manager-9999/libkcups/KCupsConnection.cpp:303
#17 0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x1c06940) at thread/qthread_unix.cpp:331
#18 0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#19 0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f4b96518700 (LWP 4249)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0x25cc110) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0x25962a8, mutex=mutex@entry=0x25962a0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0x2596298) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0x2596220) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0x2596220) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x2596220) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f4b94a0b700 (LWP 4251)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0x25fa3a0) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0x25a2078, mutex=mutex@entry=0x25a2070, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0x25a2068) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0x25a1ff0) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0x25a1ff0) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x25a1ff0) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f4b839e8700 (LWP 4252)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0x30e43f0) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0x30e9b38, mutex=mutex@entry=0x30e9b30, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0x30e9b28) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0x30e9ab0) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0x30e9ab0) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x30e9ab0) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f4b824b0700 (LWP 4379)):
#0  0x00007f4c69b2577f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4c6a9880c3 in wait (time=18446744073709551615, this=0x22d1220) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=this@entry=0x132e5e8, mutex=mutex@entry=0x132e5e0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f4c6dc2eafb in takeEvent (wait=true, this=0x132e5d8) at scenegraph/qsgthreadedrenderloop.cpp:224
#4  QSGRenderThread::processEventsAndWaitForMore (this=this@entry=0x132e560) at scenegraph/qsgthreadedrenderloop.cpp:654
#5  0x00007f4c6dc2eee0 in QSGRenderThread::run (this=0x132e560) at scenegraph/qsgthreadedrenderloop.cpp:683
#6  0x00007f4c6a986f46 in QThreadPrivate::start (arg=0x132e560) at thread/qthread_unix.cpp:331
#7  0x00007f4c69b21354 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f4c6a31e4ad in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f4c6fba37c0 (LWP 4186)):
[KCrash Handler]
#6  0x00007f4c6d15bcd1 in wasDeleted (object=0x123fb60) at ../../include/QtQml/5.5.0/QtQml/private/../../../../../src/qml/qml/qqmldata_p.h:244
#7  QV4::QObjectWrapper::wrap (engine=engine@entry=0xc486f0, object=0x123fb60) at jsruntime/qv4qobjectwrapper.cpp:577
#8  0x00007f4c6d0de014 in QV4::ExecutionEngine::fromVariant (this=this@entry=0xc486f0, variant=...) at jsruntime/qv4engine.cpp:1418
#9  0x00007f4c6d2100c4 in QV4::QmlContextWrapper::get (m=<optimized out>, name=<optimized out>, hasProperty=<optimized out>) at qml/qqmlcontextwrapper.cpp:232
#10 0x00007f4c6d0e5b72 in get (hasProperty=0x7fffe7338030, name=0x7f4c438010e0, this=<optimized out>) at jsruntime/qv4object_p.h:276
#11 QV4::ExecutionContext::getProperty (this=0x7f4c438010e8, name=0x7f4c438010e0) at jsruntime/qv4context.cpp:383
#12 0x00007f4c6d173bdf in QV4::Runtime::getActivationProperty (engine=0xc486f0, nameIndex=<optimized out>) at jsruntime/qv4runtime.cpp:690
#13 0x00007f4c6cced7cd in ?? ()
#14 0x0000000000000000 in ?? ()

Reported using DrKonqi