Application: systemsettings5 (5.18.5)

Qt Version: 5.14.2
Frameworks Version: 5.70.0
Operating System: Linux 5.6.19-300.fc32.x86_64 x86_64
Windowing system: X11
Distribution: "Fedora release 32 (Thirty Two)"

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

I cancelled a change in the monitor framerate.

- Unusual behavior I noticed:
Monitor connected to VGA was blank and frame rate was set (not by me) to 120Hz, which is not at all supported by that monitor (it is an LCD with support for 60Hz and 75Hz). Also the resolution was set to 1024x768 pixels (instead of 1280x1024).

Other issues I saw recently:
- Sometimes (after standby mode) the VGA monitor is blank and multi-monitor handling seems to be corrupted. When I then try to open KDE system settings, it seems to open on this blanked monitor. My KDE panel is on the working monitor, so when I try to "move" the KDE system settings  (via menu of the taskbar entry), I cannot move it to the working screen and I lose control over the mouse as well (the mouse pointer seems to be stuck on the blanked monitor). With Alt-Tab I can change to an already open shell window and shut-down the machine more or less cleanly.
- When I start a certain LXC root container, I had strange display bugs as well. (Gone after I removed [AFAIR] SYS_ADMIN from that container.)

The crash does not seem to be reproducible.

-- Backtrace:
Application: Systemeinstellungen (systemsettings5), signal: Bus error
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ffff20d1f80 (LWP 4380))]

Thread 25 (Thread 0x7fff6d4d9700 (LWP 5558)):
#0  0x00007ffff64ecb6f in poll () from /lib64/libc.so.6
#1  0x00007fff7ed75246 in poll_func () from /lib64/libpulse.so.0
#2  0x00007fff7ed66991 in pa_mainloop_poll () from /lib64/libpulse.so.0
#3  0x00007fff7ed67013 in pa_mainloop_iterate () from /lib64/libpulse.so.0
#4  0x00007fff7ed670c0 in pa_mainloop_run () from /lib64/libpulse.so.0
#5  0x00007fff7ed7531d in thread () from /lib64/libpulse.so.0
#6  0x00007fff7ed115cc in internal_thread_func () from /usr/lib64/pulseaudio/libpulsecommon-13.99.so
#7  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#8  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 24 (Thread 0x7fff7db1a700 (LWP 5096)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 23 (Thread 0x7fff7e9fe700 (LWP 5079)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 22 (Thread 0x7fff7fbff700 (LWP 5042)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 21 (Thread 0x7fff8c91e700 (LWP 5037)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 20 (Thread 0x7fff8dd0c700 (LWP 4937)):
#0  0x00007ffff64ecb6f in poll () from /lib64/libc.so.6
#1  0x00007ffff4839ace in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007ffff4839c03 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007ffff6a56b8b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007ffff6a0991b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007ffff6875427 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007ffff5b571e9 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007ffff6876690 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 19 (Thread 0x7fff8fdc6700 (LWP 4847)):
#0  0x00007ffff64e857c in read () from /lib64/libc.so.6
#1  0x00007ffff488353f in g_wakeup_acknowledge () from /lib64/libglib-2.0.so.0
#2  0x00007ffff483960e in g_main_context_check () from /lib64/libglib-2.0.so.0
#3  0x00007ffff4839a75 in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#4  0x00007ffff4839c03 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#5  0x00007ffff6a56b8b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007ffff6a0991b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#7  0x00007ffff6875427 in QThread::exec() () from /lib64/libQt5Core.so.5
#8  0x00007ffff5b571e9 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#9  0x00007ffff6876690 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#10 0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#11 0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 18 (Thread 0x7fffcd291700 (LWP 4751)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 17 (Thread 0x7fffcda92700 (LWP 4750)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 16 (Thread 0x7fffce293700 (LWP 4749)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 15 (Thread 0x7fffcea94700 (LWP 4748)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7fffcf295700 (LWP 4747)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7fffcfa96700 (LWP 4746)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7fffd0297700 (LWP 4745)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7fffd0a98700 (LWP 4744)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7fffd1299700 (LWP 4743)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fffd1a9a700 (LWP 4742)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fffd229b700 (LWP 4741)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fffd2a9c700 (LWP 4740)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fffd329d700 (LWP 4739)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fffdc97a700 (LWP 4738)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fffdd2d0700 (LWP 4735)):
#0  0x00007ffff51bbe92 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fffdd8602ab in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007fffdd85fd7b in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fffdfe46700 (LWP 4606)):
#0  0x00007ffff64ecb6f in poll () from /lib64/libc.so.6
#1  0x00007ffff4839ace in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007ffff4839c03 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007ffff6a56b8b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007ffff6a0991b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007ffff6875427 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007ffff6ce451b in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#7  0x00007ffff6876690 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fffe4dfb700 (LWP 4511)):
#0  0x00007ffff64ecb6f in poll () from /lib64/libc.so.6
#1  0x00007ffff517238a in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007ffff517471a in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fffe4fcec78 in QXcbEventQueue::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007ffff6876690 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007ffff51b5432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff64f79d3 in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ffff20d1f80 (LWP 4380)):
[KCrash Handler]
#4  0x00007ffff5f10489 in QQuickWindow::mouseGrabberItem() const () from /lib64/libQt5Quick.so.5
#5  0x00007ffff5f1290f in QQuickWindowPrivate::removeGrabber(QQuickItem*, bool, bool) () from /lib64/libQt5Quick.so.5
#6  0x00007ffff5efd3e3 in QQuickItemPrivate::derefWindow() () from /lib64/libQt5Quick.so.5
#7  0x00007ffff5efe3a6 in QQuickItem::~QQuickItem() () from /lib64/libQt5Quick.so.5
#8  0x00007ffff5f40a52 in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() () from /lib64/libQt5Quick.so.5
#9  0x00007ffff6a32961 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#10 0x00007ffff7431063 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#11 0x00007ffff6a0afc0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#12 0x00007ffff6a0dc47 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#13 0x00007ffff6a570a7 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#14 0x00007ffff48397af in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#15 0x00007ffff4839b38 in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#16 0x00007ffff4839c03 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#17 0x00007ffff6a56b73 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#18 0x00007ffff6a0991b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#19 0x00007ffff6a115a6 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#20 0x0000555555561884 in main ()
[Inferior 1 (process 4380) detached]

The reporter indicates this bug may be a duplicate of or related to bug 422099.

Possible duplicates by query: bug 422099, bug 420590, bug 420331, bug 419625, bug 417410.

Reported using DrKonqi