Bug 405738

Application: systemsettings5 (5.13.5)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 4.18.0-16-generic x86_64
Distribution: Ubuntu 18.10

-- Information about the crash:
1. Open "system settings" from the start menu
2. In search field type "repo" or open "Launch Feedback" tab
3. Look at windows title.

Windows title will flicker and change to "Launch Feedback *" back and forth very fast.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f690773c840 (LWP 8059))]

Thread 7 (Thread 0x7f68e508d700 (LWP 8068)):
#0  __GI___libc_read (fd=20, buf=0x7f68e508cb20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f690ac7e180 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f690ac3891f in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f690ac38df0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f690ac38f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f690e02c15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f690dfd916b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f690de280b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f690d0e91f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f690de31c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f690bfae164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007f690db15def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f68e7f7d700 (LWP 8066)):
#0  0x00007f690ac7f509 in g_mutex_lock () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f690ac38571 in g_main_context_query () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f690ac38dc7 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f690ac38f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f690e02c15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f690dfd916b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f690de280b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f690d0e91f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f690de31c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f690bfae164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007f690db15def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f68ed620700 (LWP 8065)):
#0  __GI___libc_read (fd=15, buf=0x7f68ed61fb20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f690ac7e180 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f690ac3891f in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f690ac38df0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f690ac38f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f690e02c15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f690dfd916b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f690de280b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f690d0e91f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f690de31c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f690bfae164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007f690db15def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f68fd160700 (LWP 8063)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56551865e39c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x56551865e348, cond=0x56551865e370) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x56551865e370, mutex=0x56551865e348) at pthread_cond_wait.c:655
#3  0x00007f68fdcc49cb in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007f68fdcc4737 in ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007f690bfae164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f690db15def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f68fffff700 (LWP 8062)):
#0  0x00007f690db096d9 in __GI___poll (fds=0x7f68f80130f0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f690ac38e46 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f690ac38f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f690e02c15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f690dfd916b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f690de280b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f690e2e5545 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f690de31c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f690bfae164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007f690db15def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f6905e10700 (LWP 8061)):
#0  0x00007f690db096d9 in __GI___poll (fds=0x7f6905e0fc78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f690bf6c917 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f690bf6e53a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f6906db2159 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f690de31c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f690bfae164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f690db15def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f690773c840 (LWP 8059)):
[KCrash Handler]
#6  0x00007f690f5254b2 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#7  0x00007f690e003830 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f68e5cc7d43 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_launchfeedback.so
#9  0x00007f68e5cca3e3 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_launchfeedback.so
#10 0x00007f690d005084 in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f690d005dde in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f690d005ed4 in QV4::QObjectWrapper::put(QV4::Managed*, QV4::String*, QV4::Value const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007f690d018eac in QV4::Runtime::method_storeProperty(QV4::ExecutionEngine*, QV4::Value const&, int, QV4::Value const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#14 0x00007f690d024789 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007f68e526ca5d in ?? ()
#16 0x00007f68e444e320 in ?? ()
#17 0x00007f68e444e328 in ?? ()
#18 0x0000565519009b40 in ?? ()
#19 0x0000000000000000 in ?? ()
[Inferior 1 (process 8059) detached]