https://bugs.kde.org/show_bug.cgi?id=359781

--- Comment #4 from Sudhir Khanger <sud...@sudhirkhanger.com> ---
Marco Martin is this what you were looking for?

Application: plasmashell (5.5.4)

Qt Version: 5.5.1
Operating System: Linux 4.4.2-301.fc23.x86_64 x86_64
Distribution: "Fedora release 23 (Twenty Three)"

-- Information about the crash:
<In detail, tell us what you were doing  when the application crashed.>

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
84    T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f38e6165940 (LWP 2715))]

Thread 9 (Thread 0x7f38c621e700 (LWP 2719)):
#0  0x00007f38ddb41fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f38e3ffb272 in poll (__timeout=-1, __nfds=1, __fds=0x7f38c621db80)
at /usr/include/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x5641cded7ed0, cond=cond@entry=0x5641cded7f10,
vector=vector@entry=0x0, count=count@entry=0x0) at xcb_conn.c:459
#3  0x00007f38e3ffcee7 in xcb_wait_for_event (c=0x5641cded7ed0) at xcb_in.c:693
#4  0x00007f38c81a8da9 in QXcbEventReader::run (this=0x5641cdee1d40) at
qxcbconnection.cpp:1255
#5  0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641cdee1d40) at
thread/qthread_unix.cpp:331
#6  0x00007f38dce8560a in start_thread (arg=0x7f38c621e700) at
pthread_create.c:334
#7  0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f38bf5ef700 (LWP 2740)):
#0  0x00007f38ddb41fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f38d906716c in g_main_context_poll (priority=2147483647, n_fds=1,
fds=0x7f38b8003070, timeout=<optimized out>, context=0x7f38b8000990) at
gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f38b8000990,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
gmain.c:3835
#3  0x00007f38d906727c in g_main_context_iteration (context=0x7f38b8000990,
may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007f38de981ecb in QEventDispatcherGlib::processEvents
(this=0x7f38b80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f38de928eca in QEventLoop::exec (this=this@entry=0x7f38bf5eec60,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f38de745434 in QThread::exec (this=this@entry=0x5641cdfc2910) at
thread/qthread.cpp:503
#7  0x00007f38e2a929b5 in QQmlThreadPrivate::run (this=0x5641cdfc2910) at
/usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/qml/qml/ftw/qqmlthread.cpp:141
#8  0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641cdfc2910) at
thread/qthread_unix.cpp:331
#9  0x00007f38dce8560a in start_thread (arg=0x7f38bf5ef700) at
pthread_create.c:334
#10 0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f38b6773700 (LWP 2741)):
#0  0x00007f38ddb41fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f38d906716c in g_main_context_poll (priority=2147483647, n_fds=1,
fds=0x7f38b0002e70, timeout=<optimized out>, context=0x7f38b0000990) at
gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f38b0000990,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
gmain.c:3835
#3  0x00007f38d906727c in g_main_context_iteration (context=0x7f38b0000990,
may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007f38de981ecb in QEventDispatcherGlib::processEvents
(this=0x7f38b00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f38de928eca in QEventLoop::exec (this=this@entry=0x7f38b6772c60,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f38de745434 in QThread::exec (this=this@entry=0x5641ce2acbb0) at
thread/qthread.cpp:503
#7  0x00007f38e2a929b5 in QQmlThreadPrivate::run (this=0x5641ce2acbb0) at
/usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/qml/qml/ftw/qqmlthread.cpp:141
#8  0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641ce2acbb0) at
thread/qthread_unix.cpp:331
#9  0x00007f38dce8560a in start_thread (arg=0x7f38b6773700) at
pthread_create.c:334
#10 0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f38b4d55700 (LWP 2742)):
#0  0x00007f38ddb41fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f38d906716c in g_main_context_poll (priority=2147483647, n_fds=1,
fds=0x7f38a8003070, timeout=<optimized out>, context=0x7f38a8000990) at
gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f38a8000990,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
gmain.c:3835
#3  0x00007f38d906727c in g_main_context_iteration (context=0x7f38a8000990,
may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007f38de981ecb in QEventDispatcherGlib::processEvents
(this=0x7f38a80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f38de928eca in QEventLoop::exec (this=this@entry=0x7f38b4d54c60,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f38de745434 in QThread::exec (this=this@entry=0x5641ce3a2010) at
thread/qthread.cpp:503
#7  0x00007f38e2a929b5 in QQmlThreadPrivate::run (this=0x5641ce3a2010) at
/usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/qml/qml/ftw/qqmlthread.cpp:141
#8  0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641ce3a2010) at
thread/qthread_unix.cpp:331
#9  0x00007f38dce8560a in start_thread (arg=0x7f38b4d55700) at
pthread_create.c:334
#10 0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f38af3d6700 (LWP 2743)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f38e58eb514 in QTWTF::TCMalloc_PageHeap::scavengerThread
(this=0x7f38e5bd4380 <QTWTF::pageheap_memory>) at
/usr/src/debug/qtscript-opensource-src-5.5.1/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f38e58eb559 in QTWTF::TCMalloc_PageHeap::runScavengerThread
(context=<optimized out>) at
/usr/src/debug/qtscript-opensource-src-5.5.1/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f38dce8560a in start_thread (arg=0x7f38af3d6700) at
pthread_create.c:334
#4  0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f3827fff700 (LWP 2748)):
#0  0x00007f38de74252a in QBasicAtomicOps<8>::testAndSetRelaxed<QMutexData*>
(currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0,
_q_value=@0x5641ce5b8f38: 0x1) at ../../src/corelib/arch/qatomic_x86.h:259
#1  QGenericAtomicOps<QBasicAtomicOps<8> >::testAndSetAcquire<QMutexData*,
QMutexData*> (currentValue=<synthetic pointer>, newValue=<optimized out>,
expectedValue=0x0, _q_value=@0x5641ce5b8f38: 0x1) at
../../src/corelib/thread/qgenericatomic.h:166
#2  QBasicAtomicPointer<QMutexData>::testAndSetAcquire (currentValue=<synthetic
pointer>, newValue=<optimized out>, expectedValue=0x0, this=0x5641ce5b8f38,
this@entry=0x1) at ../../src/corelib/thread/qbasicatomic.h:278
#3  QBasicMutex::fastTryLock (current=<synthetic pointer>, this=0x5641ce5b8f38,
this@entry=0x1) at thread/qmutex.h:82
#4  QMutex::lock (this=this@entry=0x5641ce5b8f38) at thread/qmutex.cpp:212
#5  0x00007f38de98144f in QMutexLocker::QMutexLocker (m=0x5641ce5b8f38,
this=<synthetic pointer>) at ../../src/corelib/thread/qmutex.h:128
#6  QThreadData::canWaitLocked (this=0x5641ce5b8f10) at
../../src/corelib/thread/qthread_p.h:240
#7  postEventSourcePrepare (s=0x7f38200012d0,
timeout=timeout@entry=0x7f3827ffea54) at kernel/qeventdispatcher_glib.cpp:254
#8  0x00007f38d906670d in g_main_context_prepare
(context=context@entry=0x7f3820000990, priority=priority@entry=0x7f3827ffeae0)
at gmain.c:3442
#9  0x00007f38d906709b in g_main_context_iterate
(context=context@entry=0x7f3820000990, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3820
#10 0x00007f38d906727c in g_main_context_iteration (context=0x7f3820000990,
may_block=may_block@entry=1) at gmain.c:3901
#11 0x00007f38de981ecb in QEventDispatcherGlib::processEvents
(this=0x7f38200008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#12 0x00007f38de928eca in QEventLoop::exec (this=this@entry=0x7f3827ffec10,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#13 0x00007f38de745434 in QThread::exec (this=this@entry=0x5641ce5b7c00) at
thread/qthread.cpp:503
#14 0x00007f38e36408d6 in QQuickPixmapReader::run (this=0x5641ce5b7c00) at
/usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/quick/util/qquickpixmapcache.cpp:760
#15 0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641ce5b7c00) at
thread/qthread_unix.cpp:331
#16 0x00007f38dce8560a in start_thread (arg=0x7f3827fff700) at
pthread_create.c:334
#17 0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f3816110700 (LWP 2787)):
#0  0x00007f38ddb41fdd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f38d906716c in g_main_context_poll (priority=2147483647, n_fds=1,
fds=0x7f38100048c0, timeout=<optimized out>, context=0x7f3810000990) at
gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f3810000990,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
gmain.c:3835
#3  0x00007f38d906727c in g_main_context_iteration (context=0x7f3810000990,
may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007f38de981ecb in QEventDispatcherGlib::processEvents
(this=0x7f38100008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f38de928eca in QEventLoop::exec (this=this@entry=0x7f381610fc40,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f38de745434 in QThread::exec (this=this@entry=0x5641d0b13d60) at
thread/qthread.cpp:503
#7  0x00007f3817d49547 in KCupsConnection::run (this=0x5641d0b13d60) at
/usr/src/debug/print-manager-15.12.1/libkcups/KCupsConnection.cpp:304
#8  0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641d0b13d60) at
thread/qthread_unix.cpp:331
#9  0x00007f38dce8560a in start_thread (arg=0x7f3816110700) at
pthread_create.c:334
#10 0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f380a527700 (LWP 8539)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f38de74b5a6 in QWaitConditionPrivate::wait_relative (time=30000,
this=0x5641d119fc40) at thread/qwaitcondition_unix.cpp:126
#2  QWaitConditionPrivate::wait (time=30000, this=0x5641d119fc40) at
thread/qwaitcondition_unix.cpp:134
#3  QWaitCondition::wait (this=this@entry=0x5641d0fa0120,
mutex=mutex@entry=0x5641d0b29600, time=30000) at
thread/qwaitcondition_unix.cpp:208
#4  0x00007f38de747063 in QThreadPoolThread::run (this=0x5641d0fa0110) at
thread/qthreadpool.cpp:127
#5  0x00007f38de74a3de in QThreadPrivate::start (arg=0x5641d0fa0110) at
thread/qthread_unix.cpp:331
#6  0x00007f38dce8560a in start_thread (arg=0x7f380a527700) at
pthread_create.c:334
#7  0x00007f38ddb4da4d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f38e6165940 (LWP 2715)):
[KCrash Handler]
#6  QBasicAtomicPointer<QtSharedPointer::ExternalRefCountData>::load
(this=0xd1620068) at ../../src/corelib/thread/qbasicatomic.h:254
#7  QtSharedPointer::ExternalRefCountData::getAndRef
(obj=obj@entry=0x5641d0fb2d50) at tools/qsharedpointer.cpp:1330
#8  0x00007f38dff3cce5 in QWeakPointer<QObject>::QWeakPointer<QObject>
(ptr=0x5641d0fb2d50, this=<optimized out>) at
../../src/corelib/tools/qsharedpointer_impl.h:696
#9  QWeakPointer<QObject>::assign<QObject> (ptr=0x5641d0fb2d50,
this=0x7f38e060f340 <qt_last_mouse_receiver>) at
../../src/corelib/tools/qsharedpointer_impl.h:692
#10 QPointer<QWidget>::operator= (p=0x5641d0fb2d50, this=0x7f38e060f340
<qt_last_mouse_receiver>) at ../../src/corelib/kernel/qpointer.h:67
#11 QWidgetWindow::handleMouseEvent (this=this@entry=0x5641d316b520,
event=event@entry=0x7ffdebbde900) at kernel/qwidgetwindow.cpp:453
#12 0x00007f38dff3ef3b in QWidgetWindow::event (this=0x5641d316b520,
event=0x7ffdebbde900) at kernel/qwidgetwindow.cpp:210
#13 0x00007f38dfedf41c in QApplicationPrivate::notify_helper
(this=0x5641cdecb460, receiver=0x5641d316b520, e=0x7ffdebbde900) at
kernel/qapplication.cpp:3716
#14 0x00007f38dfee48e6 in QApplication::notify (this=0x7ffdebbdede0,
receiver=0x5641d316b520, e=0x7ffdebbde900) at kernel/qapplication.cpp:3499
#15 0x00007f38de92b73b in QCoreApplication::notifyInternal
(this=0x7ffdebbdede0, receiver=receiver@entry=0x5641d316b520,
event=event@entry=0x7ffdebbde900) at kernel/qcoreapplication.cpp:965
#16 0x00007f38dee67eb1 in QCoreApplication::sendSpontaneousEvent
(event=0x7ffdebbde900, receiver=0x5641d316b520) at
../../src/corelib/kernel/qcoreapplication.h:227
#17 QGuiApplicationPrivate::processMouseEvent (e=0x5641d14890d0) at
kernel/qguiapplication.cpp:1789
#18 0x00007f38dee69b75 in QGuiApplicationPrivate::processWindowSystemEvent
(e=e@entry=0x5641d14890d0) at kernel/qguiapplication.cpp:1581
#19 0x00007f38dee4d918 in QWindowSystemInterface::sendWindowSystemEvents
(flags=...) at kernel/qwindowsysteminterface.cpp:625
#20 0x00007f38c81da0b0 in userEventSourceDispatch (source=<optimized out>) at
eventdispatchers/qeventdispatcher_glib.cpp:70
#21 0x00007f38d9066e3a in g_main_dispatch (context=0x7f38c00016f0) at
gmain.c:3154
#22 g_main_context_dispatch (context=context@entry=0x7f38c00016f0) at
gmain.c:3769
#23 0x00007f38d90671d0 in g_main_context_iterate
(context=context@entry=0x7f38c00016f0, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3840
#24 0x00007f38d906727c in g_main_context_iteration (context=0x7f38c00016f0,
may_block=may_block@entry=1) at gmain.c:3901
#25 0x00007f38de981eaf in QEventDispatcherGlib::processEvents
(this=0x5641cdec0d90, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#26 0x00007f38de928eca in QEventLoop::exec (this=this@entry=0x7ffdebbdec80,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#27 0x00007f38de930fac in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1229
#28 0x00005641cc31608a in main (argc=4, argv=<optimized out>) at
/usr/src/debug/plasma-workspace-5.5.4/shell/main.cpp:181

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