Bug 401117

Application: systemsettings5 (5.13.5)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 4.18.0-11-generic x86_64
Distribution: Ubuntu 18.10

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

- Open 'System Settings' and naviate to 'Applications' under the 'Personalization' category.
- Go to 'Launch Feedback' item in the list.
- Notice the rapid change in the window title in the Title bar from 'Launch Feedback - System Settings' <--> 'Launch Feedback *- System Settings' (the asterisk- denoting changes were made)
- Navigate away from the setting, making or not making changes.
- 'System Settings' now crashes

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 0x7fc7405cf840 (LWP 2864))]

Thread 9 (Thread 0x7fc717fff700 (LWP 2902)):
#0  0x00007fc74699c6d9 in __GI___poll (fds=0x55daa84c1e10, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc743acbe46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc743acc1d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc7167117b6 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fc743af4135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fc72140e700 (LWP 2901)):
#0  0x00007fc74699c6d9 in __GI___poll (fds=0x7fc7100acb00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc743acbe46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc743acbf6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc743acbfb1 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc743af4135 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fc722c25700 (LWP 2873)):
#0  0x00007fc746997f64 in __GI___libc_read (fd=18, buf=0x7fc722c24b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fc743b11180 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc743acb91f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc743acbdf0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc743acbf6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc746ebf15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc746e6c16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc746cbb0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc745f7c1f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fc746cc4c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fc7295f6700 (LWP 2872)):
#0  0x00007fc746997f64 in __GI___libc_read (fd=14, buf=0x7fc7295f5b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fc743b11180 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc743acb91f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc743acbdf0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc743acbf6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc746ebf15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc746e6c16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc746cbb0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc745f7c1f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fc746cc4c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fc72abc5700 (LWP 2870)):
#0  0x00007fc746997f64 in __GI___libc_read (fd=13, buf=0x7fc72abc4b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fc743b11180 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc743acb91f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc743acbdf0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc743acbf6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc746ebf15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc746e6c16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc746cbb0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc745f7c1f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fc746cc4c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fc736a77700 (LWP 2868)):
#0  0x00007fc744e472eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55daa0d7dd6c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc744e472eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x55daa0d7dd18, cond=0x55daa0d7dd40) at pthread_cond_wait.c:502
#2  0x00007fc744e472eb in __pthread_cond_wait (cond=0x55daa0d7dd40, mutex=0x55daa0d7dd18) at pthread_cond_wait.c:655
#3  0x00007fc73712846b in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fc7371281d7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fc73d2b6700 (LWP 2867)):
#0  0x00007fc74699c6d9 in __GI___poll (fds=0x7fc730014a70, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc743acbe46 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc743acbf6c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc746ebf15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc746e6c16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc746cbb0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc747178545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fc746cc4c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fc73ef6d700 (LWP 2866)):
#0  0x00007fc74699c6d9 in __GI___poll (fds=0x7fc73ef6cc78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc744dff917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc744e0153a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc73ff0f159 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fc746cc4c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc744e41164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fc7469a8def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc7405cf840 (LWP 2864)):
[KCrash Handler]
#6  0x00007fc7483b84b2 in  () at /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#7  0x00007fc746e96830 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc720422d43 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_launchfeedback.so
#9  0x00007fc7204253e3 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcms/kcm_launchfeedback.so
#10 0x00007fc745e98084 in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fc745e98dde in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007fc745e98ed4 in QV4::QObjectWrapper::put(QV4::Managed*, QV4::String*, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007fc745eabeac in QV4::Runtime::method_storeProperty(QV4::ExecutionEngine*, QV4::Value const&, int, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#14 0x00007fc745eb7789 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007fc72023f9ed in  ()
#16 0x00007fc721fe6320 in  ()
#17 0x00007fc721fe6328 in  ()
#18 0x000055daa42375a0 in  ()
#19 0x0000000000000000 in  ()
[Inferior 1 (process 2864) detached]

Reported using DrKonqi