[kde] [Bug 342125] New: crashed when I tried to configure dual monitors in plasma

gahziniakde at gmail.com gahziniakde at gmail.com
Mon Dec 22 13:31:00 GMT 2014 

https://bugs.kde.org/show_bug.cgi?id=342125

            Bug ID: 342125
           Summary: crashed when I tried to configure dual monitors in
                    plasma
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: gahziniakde at gmail.com

Application: plasmashell ()

Qt Version: 5.3.2
Operating System: Linux 3.17.6-300.fc21.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
- What I was doing when the application crashed:
Over the weekend, I installed plasma and had numerous issues. I'm working
through them, though. I've now got to configure my external monitors when I'm
using my docking station. I enabled the two monitors in "Display Configuration
- System Settings" and when I hit apply, it tried to get them started and
that's when it crashed.  I haven't tried to recreate the issue.

- Unusual behavior I noticed:
Nothing too crazy. 

- Custom settings of the application:
This happened when I was trying to configure my external monitors.

-- Backtrace:
Application: plasmashell (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb0585828c0 (LWP 1662))]

Thread 29 (Thread 0x7fb04abe6700 (LWP 1673)):
#0  0x000000304a6f0e4d in read () at /lib64/libc.so.6
#1  0x000000304ce8cd30 in g_wakeup_acknowledge () at /lib64/libglib-2.0.so.0
#2  0x000000304ce498ec in g_main_context_check () at /lib64/libglib-2.0.so.0
#3  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#4  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#5  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#6  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#7  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#9  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#10 0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 28 (Thread 0x7fb04115e700 (LWP 1690)):
#0  0x000000304a6f51dd in poll () at /lib64/libc.so.6
#1  0x000000304ce49e24 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 27 (Thread 0x7fb0377b3700 (LWP 1915)):
#0  0x000000304a6f51dd in poll () at /lib64/libc.so.6
#1  0x000000304ce49e24 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 26 (Thread 0x7fb0367a2700 (LWP 1916)):
#0  0x00000035eeade952 in QTimerInfoList::timerWait(timespec&) () at
/lib64/libQt5Core.so.5
#1  0x00000035eeadfcce in timerSourcePrepare(_GSource*, int*) () at
/lib64/libQt5Core.so.5
#2  0x000000304ce493ed in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#3  0x000000304ce49d4b in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#4  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#5  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#6  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#7  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#9  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#10 0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 25 (Thread 0x7fb0356b1700 (LWP 1917)):
#0  0x000000304a6f51dd in poll () at /lib64/libc.so.6
#1  0x000000304ce49e24 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 24 (Thread 0x7fb027fff700 (LWP 1918)):
#0  0x000000304a6f51dd in poll () at /lib64/libc.so.6
#1  0x000000304ce49e24 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 23 (Thread 0x7fb026ffe700 (LWP 1919)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49e19 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 22 (Thread 0x7fb025ffd700 (LWP 1920)):
#0  0x000000304ce49807 in g_main_context_check () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 21 (Thread 0x7fb0167fe700 (LWP 1923)):
#0  0x000000304aa0c590 in pthread_cond_wait@@GLIBC_2.3.2 () at
/lib64/libpthread.so.0
#1  0x00000035fe582184 in QTWTF::TCMalloc_PageHeap::scavengerThread() () at
/lib64/libQt5Script.so.5
#2  0x00000035fe5821c9 in  () at /lib64/libQt5Script.so.5
#3  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#4  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 20 (Thread 0x7fb015efd700 (LWP 1924)):
#0  0x000000304a6f0e4d in read () at /lib64/libc.so.6
#1  0x000000304ce8cd30 in g_wakeup_acknowledge () at /lib64/libglib-2.0.so.0
#2  0x000000304ce498ec in g_main_context_check () at /lib64/libglib-2.0.so.0
#3  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#4  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#5  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#6  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#7  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#9  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#10 0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 19 (Thread 0x7fb014e9c700 (LWP 1925)):
#0  0x000000304ce8e1c9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce4962b in g_main_context_query () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49d9a in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 18 (Thread 0x7faf835fc700 (LWP 1932)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49839 in g_main_context_check () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 17 (Thread 0x7faf81fca700 (LWP 1943)):
#0  0x000000304ce8e1c9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce493f9 in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49d4b in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035fc6f6746 in QQuickPixmapReader::run() () at
/lib64/libQt5Quick.so.5
#8  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#9  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#10 0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 16 (Thread 0x7fb024bca700 (LWP 1945)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49839 in g_main_context_check () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 15 (Thread 0x7fb0177ff700 (LWP 1946)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49dd9 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 14 (Thread 0x7faf7aeae700 (LWP 1947)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49839 in g_main_context_check () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 13 (Thread 0x7faf79dbd700 (LWP 1948)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49480 in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49d4b in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 12 (Thread 0x7faf78ccc700 (LWP 1949)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce499c9 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49e88 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 11 (Thread 0x7faf677ff700 (LWP 1950)):
#0  0x00000035ee894dbf in QMutex::unlock() () at /lib64/libQt5Core.so.5
#1  0x00000035eeae0215 in postEventSourceCheck(_GSource*) () at
/lib64/libQt5Core.so.5
#2  0x000000304ce49841 in g_main_context_check () at /lib64/libglib-2.0.so.0
#3  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#4  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#5  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#6  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#7  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#9  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#10 0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 10 (Thread 0x7faf667fe700 (LWP 1951)):
#0  0x000000304ce8e1c9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce48dd0 in g_main_context_acquire () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49cd5 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7faf657fd700 (LWP 1952)):
#0  0x000000304ce8e1c9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce4984c in g_main_context_check () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7faf57fff700 (LWP 1953)):
#0  0x000000304a6f51dd in poll () at /lib64/libc.so.6
#1  0x000000304ce49e24 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7faf55a43700 (LWP 1955)):
#0  0x000000304ce49858 in g_main_context_check () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7faf54952700 (LWP 1956)):
#0  0x000000304ce8e1e4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49480 in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49d4b in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7faf46758700 (LWP 2081)):
#0  0x000000304ce8e1c9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce4962b in g_main_context_query () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49d9a in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7faf4564a700 (LWP 2082)):
#0  0x000000304ce8e1c9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x000000304ce493f9 in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#2  0x000000304ce49d4b in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#3  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#4  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#5  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#6  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7faf3ffff700 (LWP 2083)):
#0  0x000000304ce49828 in g_main_context_check () at /lib64/libglib-2.0.so.0
#1  0x000000304ce49dc3 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#7  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#8  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7faf3effe700 (LWP 2084)):
#0  0x000000304a6f51dd in poll () at /lib64/libc.so.6
#1  0x000000304ce49e24 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#2  0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#3  0x00000035eeae08ac in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#4  0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#5  0x00000035ee897ae4 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00000035fc6f6746 in QQuickPixmapReader::run() () at
/lib64/libQt5Quick.so.5
#7  0x00000035ee89c93e in QThreadPrivate::start(void*) () at
/lib64/libQt5Core.so.5
#8  0x000000304aa0752a in start_thread () at /lib64/libpthread.so.0
#9  0x000000304a70077d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fb0585828c0 (LWP 1662)):
[KCrash Handler]
#5  0x00000035ef50d550 in QScreen::geometry() const () at /lib64/libQt5Gui.so.5
#6  0x00000035ef50d950 in QScreen::virtualGeometry() const () at
/lib64/libQt5Gui.so.5
#7  0x000000000043e10e in PanelView::updateStruts() ()
#8  0x000000000044196d in
PanelView::setVisibilityMode(PanelView::VisibilityMode) ()
#9  0x0000000000441ba9 in
QtPrivate::QFunctorSlotObject<PanelView::showEvent(QShowEvent*)::{lambda(QScreen*)#1},
1, QtPrivate::List<QScreen*>, void>::impl(int, QtPrivate::QSlotObjectBase*,
QObject*, void**, bool*) ()
#10 0x00000035eeab774e in QMetaObject::activate(QObject*, int, int, void**) ()
at /lib64/libQt5Core.so.5
#11 0x00000035ef4e7d9f in QWindow::screenChanged(QScreen*) () at
/lib64/libQt5Gui.so.5
#12 0x00000035ef4eabb0 in QWindowPrivate::setScreen(QScreen*, bool) () at
/lib64/libQt5Gui.so.5
#13 0x00000035ef4ead55 in QWindow::screenDestroyed(QObject*) () at
/lib64/libQt5Gui.so.5
#14 0x00000035eeab7c4d in QMetaObject::activate(QObject*, int, int, void**) ()
at /lib64/libQt5Core.so.5
#15 0x00000035eeab815f in QObject::destroyed(QObject*) () at
/lib64/libQt5Core.so.5
#16 0x00000035eeabfbcb in QObject::~QObject() () at /lib64/libQt5Core.so.5
#17 0x00000035ef85b2b7 in QScreen::~QScreen() () at /lib64/libQt5Gui.so.5
#18 0x00000035ef4d23a2 in QPlatformScreen::~QPlatformScreen() () at
/lib64/libQt5Gui.so.5
#19 0x00007fb051d929e9 in QXcbScreen::~QXcbScreen() () at
/usr/lib64/qt5/plugins/platforms/libqxcb.so
#20 0x00007fb051d85ab2 in QXcbConnection::updateScreens() () at
/usr/lib64/qt5/plugins/platforms/libqxcb.so
#21 0x00007fb051d861d5 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() at /usr/lib64/qt5/plugins/platforms/libqxcb.so
#22 0x00007fb051d874ab in QXcbConnection::processXcbEvents() () at
/usr/lib64/qt5/plugins/platforms/libqxcb.so
#23 0x00000035eeab8afa in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#24 0x00000035f053f01c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /lib64/libQt5Widgets.so.5
#25 0x00000035f0544460 in QApplication::notify(QObject*, QEvent*) () at
/lib64/libQt5Widgets.so.5
#26 0x00000035eea8925b in QCoreApplication::notifyInternal(QObject*, QEvent*)
() at /lib64/libQt5Core.so.5
#27 0x00000035eea8b223 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () at /lib64/libQt5Core.so.5
#28 0x00000035eeae04a3 in postEventSourceDispatch(_GSource*, int (*)(void*),
void*) () at /lib64/libQt5Core.so.5
#29 0x000000304ce49aeb in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#30 0x000000304ce49e88 in g_main_context_iterate.isra () at
/lib64/libglib-2.0.so.0
#31 0x000000304ce49f3c in g_main_context_iteration () at
/lib64/libglib-2.0.so.0
#32 0x00000035eeae0897 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib64/libQt5Core.so.5
#33 0x00000035eea86a92 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib64/libQt5Core.so.5
#34 0x00000035eea8e50c in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#35 0x000000000042d05f in main ()

Reported using DrKonqi

Reproducible: Didn't try

Steps to Reproduce:
1. In System Settings, Display Configuration
2. Disable laptop screen
3. Enable two external monitors
4. apply

Actual Results:  
crash

Expected Results:  
for it to work

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