Bug 391441

Application: plasmashell (5.10.5)

Qt Version: 5.9.1
Frameworks Version: 5.38.0
Operating System: Linux 4.13.0-36-generic x86_64
Distribution: Ubuntu 17.10

-- Information about the crash:
Installed Displayport 4.1 drivers, rebooted, went to enable the external monitors and it crashed.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa7c456efc0 (LWP 2889))]

Thread 7 (Thread 0x7fa6f0b58700 (LWP 3244)):
#0  0x00007fff588d997d in  ()
#1  0x00007fff588d9c30 in clock_gettime ()
#2  0x00007fa7bdbb2996 in __GI___clock_gettime (clock_id=1, tp=0x7fa6f0b579e0) at ../sysdeps/unix/clock_gettime.c:115
#3  0x00007fa7be4d6db1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa7be4d55e9 in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa7be4d5bc5 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa7be4d720e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fa7b87c96a8 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fa7b87ca09b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007fa7b87ca27c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007fa7be4d749b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fa7be47ce3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fa7be29c3ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fa6f3171717 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#14 0x00007fa7be2a129d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fa7bd4377fc in start_thread (arg=0x7fa6f0b58700) at pthread_create.c:465
#16 0x00007fa7bdba3b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fa7094a5700 (LWP 3081)):
#0  0x00007fa7b880f5b9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fa7b87c96b3 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa7b87ca09b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa7b87ca27c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa7be4d749b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa7be47ce3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa7be29c3ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fa7c1f92846 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fa7be2a129d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fa7bd4377fc in start_thread (arg=0x7fa7094a5700) at pthread_create.c:465
#10 0x00007fa7bdba3b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fa79d948700 (LWP 3039)):
#0  0x00007fa7bd43e072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fa7c3f35fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fa7bd43e072 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fa7c3f35f68, cond=0x7fa7c3f35f90) at pthread_cond_wait.c:502
#2  0x00007fa7bd43e072 in __pthread_cond_wait (cond=0x7fa7c3f35f90, mutex=0x7fa7c3f35f68) at pthread_cond_wait.c:655
#3  0x00007fa7c3c41bd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007fa7c3c41c19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007fa7bd4377fc in start_thread (arg=0x7fa79d948700) at pthread_create.c:465
#6  0x00007fa7bdba3b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fa79fbb5700 (LWP 2995)):
#0  0x00007fa7bdb97951 in __GI___poll (fds=0x7fa794002de0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fa7b87ca169 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa7b87ca27c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa7be4d749b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa7be47ce3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa7be29c3ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa7c13fcf45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fa7be2a129d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa7bd4377fc in start_thread (arg=0x7fa79fbb5700) at pthread_create.c:465
#9  0x00007fa7bdba3b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fa7a5f19700 (LWP 2944)):
#0  0x00007fa7b880f5b9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fa7b87ca268 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa7be4d749b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fa7be47ce3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa7be29c3ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa7c13fcf45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fa7be2a129d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fa7bd4377fc in start_thread (arg=0x7fa7a5f19700) at pthread_create.c:465
#8  0x00007fa7bdba3b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fa7a795e700 (LWP 2912)):
#0  0x00007fa7bdb97951 in __GI___poll (fds=0x7fa7a0002de0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fa7b87ca169 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa7b87ca27c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa7be4d749b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa7be47ce3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa7be29c3ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa7be953e45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fa7be2a129d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa7bd4377fc in start_thread (arg=0x7fa7a795e700) at pthread_create.c:465
#9  0x00007fa7bdba3b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fa7c456efc0 (LWP 2889)):
[KCrash Handler]
#6  0x00007fa70b57e608 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kquickcontrolsaddons/libkquickcontrolsaddonsplugin.so
#7  0x00007fa7be4ad9ff in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa7c2060880 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fa7c1ff6399 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fa7c206ad66 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fa7bf48346c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007fa7bf48ad34 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007fa7be47ede8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fa7becd3b01 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#15 0x00007fa7becd4019 in QWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#16 0x00007fa7c206ad05 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#17 0x00007fa7bf48346c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fa7bf48ad34 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007fa7be47ede8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fa7be4d691e in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fa7be4d70e1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fa7b87c9fb7 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fa7b87ca1f0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fa7b87ca27c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fa7be4d747f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fa7be47ce3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fa7be485da4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x0000560964b16cc2 in  ()
#29 0x00007fa7bdab01c1 in __libc_start_main (main=0x560964b16160, argc=1, argv=0x7fff588208a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff58820898) at ../csu/libc-start.c:308
#30 0x0000560964b1703a in _start ()

Reported using DrKonqi