Application: plasmashell (5.4.3)
 (Compiled from sources)
Qt Version: 5.5.1
Operating System: Linux 4.1.6-gentoo x86_64
Distribution: "Gentoo Base System release 2.2"

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

This crash happened right after disconnecting my external monitor (laptop)

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 0x7ff079eb0880 (LWP 22595))]

Thread 16 (Thread 0x7ff077b4b700 (LWP 22599)):
#0  0x00007ff0882f064d in poll () from /lib64/libc.so.6
#1  0x00007ff08c29eac2 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007ff08c2a072f in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007ff079aa8c89 in QXcbEventReader::run (this=0x18bede0) at qxcbconnection.cpp:1229
#4  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x18bede0) at thread/qthread_unix.cpp:331
#5  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 15 (Thread 0x7ff074eb7700 (LWP 22652)):
#0  0x00007ff08432bab9 in g_mutex_lock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007ff0842e792c in g_main_context_check () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ff0842e7ec0 in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007ff0842e802c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007ff088b5803c in QEventDispatcherGlib::processEvents (this=0x7ff0680008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007ff088b0927a in QEventLoop::exec (this=this@entry=0x7ff074eb6d20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007ff088958a84 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007ff08b139355 in ?? () from /usr/lib64/libQt5Qml.so.5
#8  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x19b18a0) at thread/qthread_unix.cpp:331
#9  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#10 0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7ff066fe6700 (LWP 22681)):
#0  0x00007ff0842e7444 in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#1  0x00007ff0842e7e48 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ff0842e802c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007ff088b5803c in QEventDispatcherGlib::processEvents (this=0x7ff0600008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007ff088b0927a in QEventLoop::exec (this=this@entry=0x7ff066fe5d20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007ff088958a84 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007ff08b139355 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x1cecda0) at thread/qthread_unix.cpp:331
#8  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7ff064fe4700 (LWP 22716)):
#0  0x00007ff088b57d7d in postEventSourcePrepare (s=0x7ff0580012d0, timeout=0x7ff064fe3b64) at kernel/qeventdispatcher_glib.cpp:246
#1  0x00007ff0842e745d in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ff0842e7e48 in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007ff0842e802c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007ff088b5803c in QEventDispatcherGlib::processEvents (this=0x7ff0580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007ff088b0927a in QEventLoop::exec (this=this@entry=0x7ff064fe3d20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007ff088958a84 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007ff08b139355 in ?? () from /usr/lib64/libQt5Qml.so.5
#8  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x1e52130) at thread/qthread_unix.cpp:331
#9  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#10 0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7ff05f5f7700 (LWP 22752)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08d508834 in ?? () from /usr/lib64/libQt5Script.so.5
#2  0x00007ff08d508879 in ?? () from /usr/lib64/libQt5Script.so.5
#3  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7ff05c9f7700 (LWP 22756)):
#0  0x00007ff0842e6f82 in g_main_context_release () from /usr/lib64/libglib-2.0.so.0
#1  0x00007ff0842e7ed6 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ff0842e802c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007ff088b5803c in QEventDispatcherGlib::processEvents (this=0x7fefd40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007ff088b0927a in QEventLoop::exec (this=this@entry=0x7ff05c9f6cd0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007ff088958a84 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007ff08bad1b06 in ?? () from /usr/lib64/libQt5Quick.so.5
#7  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x1f3b410) at thread/qthread_unix.cpp:331
#8  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7fefc5f66700 (LWP 22863)):
#0  0x00007ff0882f064d in poll () from /lib64/libc.so.6
#1  0x00007ff0842e7f1c in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ff0842e802c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007ff088b5803c in QEventDispatcherGlib::processEvents (this=0x7fefb80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007ff088b0927a in QEventLoop::exec (this=this@entry=0x7fefc5f65d00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007ff088958a84 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fefc6e0f957 in KCupsConnection::run() () from /usr/lib64/libkcupslib.so
#7  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x295a230) at thread/qthread_unix.cpp:331
#8  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fefbcd9e700 (LWP 22918)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x3235180) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x2a35bc0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x2a35b40) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fefbd59f700 (LWP 23308)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x3011e70) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1d09f70, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x1d09ef0) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fefaf5fd700 (LWP 23341)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x37f1ea0) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x3556720, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x35566a0) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fefae9f9700 (LWP 29061)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x3cac740) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x3841710, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x3841690) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fefad5f5700 (LWP 31469)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x3d2b500) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x3f0ba90, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x3f0ba10) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fef9630f700 (LWP 31910)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x48b0270) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x43724b0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x4372430) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fefaca3b700 (LWP 6131)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x4519e50) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x3aa33b0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x3aa3330) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fef96c7e700 (LWP 6738)):
#0  0x00007ff087b0600f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007ff08895db7a in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x474c880) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x3acfab0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007ff08bb453f3 in ?? () from /usr/lib64/libQt5Quick.so.5
#4  0x00007ff08bb457f0 in ?? () from /usr/lib64/libQt5Quick.so.5
#5  0x00007ff08895d4f2 in QThreadPrivate::start (arg=0x3acfa30) at thread/qthread_unix.cpp:331
#6  0x00007ff087b00444 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ff0882f96ad in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ff079eb0880 (LWP 22595)):
[KCrash Handler]
#6  QScreen::refreshRate (this=0x0) at kernel/qscreen.cpp:463
#7  0x00007ff08bb45fb8 in ?? () from /usr/lib64/libQt5Quick.so.5
#8  0x00007ff08bb46050 in ?? () from /usr/lib64/libQt5Quick.so.5
#9  0x00007ff088b32894 in QMetaObject::activate (sender=0x1af1170, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3713
#10 0x00007ff08893a2ce in QUnifiedTimer::startAnimationDriver (this=0x1ad0310) at animation/qabstractanimation.cpp:279
#11 0x00007ff08893b245 in QUnifiedTimer::resumeAnimationTimer (timer=0x208eab0) at animation/qabstractanimation.cpp:497
#12 0x00007ff08b16ed65 in QQmlAnimationTimer::stopTimer() () from /usr/lib64/libQt5Qml.so.5
#13 0x00007ff088b3394a in QObject::event (this=0x208eab0, e=<optimized out>) at kernel/qobject.cpp:1239
#14 0x00007ff08956e69c in QApplicationPrivate::notify_helper (this=this@entry=0x1899400, receiver=receiver@entry=0x208eab0, e=e@entry=0x1c06af0) at kernel/qapplication.cpp:3716
#15 0x00007ff089573b10 in QApplication::notify (this=0x7ffd5bd31080, receiver=0x208eab0, e=0x1c06af0) at kernel/qapplication.cpp:3499
#16 0x00007ff088b0a65d in QCoreApplication::notifyInternal (this=0x7ffd5bd31080, receiver=0x208eab0, event=event@entry=0x1c06af0) at kernel/qcoreapplication.cpp:965
#17 0x00007ff088b0d423 in QCoreApplication::sendEvent (event=0x1c06af0, receiver=<optimized out>) at kernel/qcoreapplication.h:224
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x188ed20) at kernel/qcoreapplication.cpp:1593
#19 0x00007ff088b0d9e8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1451
#20 0x00007ff088b57fb3 in postEventSourceDispatch (s=0x18ea6e0) at kernel/qeventdispatcher_glib.cpp:271
#21 0x00007ff0842e7c9d in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#22 0x00007ff0842e7f80 in ?? () from /usr/lib64/libglib-2.0.so.0
#23 0x00007ff0842e802c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#24 0x00007ff088b58027 in QEventDispatcherGlib::processEvents (this=0x188f380, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#25 0x00007ff088b0927a in QEventLoop::exec (this=this@entry=0x7ffd5bd30f00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#26 0x00007ff088b1064c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#27 0x0000000000431906 in main ()

Reported using DrKonqi