Application: systemsettings5 (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-21-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Various Things, opening FileZilla, Moving a Window, Also happens on Login/Start
- Unusual behavior I noticed:
Also happens using kwin with LXQT
Happens Right away, only after last update

The crash can be reproduced sometimes.

-- 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 0x7f85eec078c0 (LWP 2494))]

Thread 4 (Thread 0x7f85dd44c700 (LWP 2495)):
#0  0x00007f85eb32ce8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f85e9014c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f85e90168d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f85df79e629 in QXcbEventReader::run (this=0x16c3490) at qxcbconnection.cpp:1253
#4  0x00007f85eba2284e in QThreadPrivate::start (arg=0x16c3490) at thread/qthread_unix.cpp:331
#5  0x00007f85e879e6fa in start_thread (arg=0x7f85dd44c700) at pthread_create.c:333
#6  0x00007f85eb338b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f85cdf15700 (LWP 2506)):
#0  0x00007f85eb32ce8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f85e827d31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f85e827d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f85ebc59a9b in QEventDispatcherGlib::processEvents (this=0x7f85c8001e00, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f85ebc00dea in QEventLoop::exec (this=this@entry=0x7f85cdf14ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f85eba1d8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f85ea39c3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f85eba2284e in QThreadPrivate::start (arg=0x1cf4e70) at thread/qthread_unix.cpp:331
#8  0x00007f85e879e6fa in start_thread (arg=0x7f85cdf15700) at pthread_create.c:333
#9  0x00007f85eb338b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f85c6d01700 (LWP 2507)):
#0  0x00007f85e827a340 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f85e827cc7a in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f85e827d2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f85e827d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f85ebc59a9b in QEventDispatcherGlib::processEvents (this=0x7f85c003d1b0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f85ebc00dea in QEventLoop::exec (this=this@entry=0x7f85c6d00ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f85eba1d8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f85ea39c3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f85eba2284e in QThreadPrivate::start (arg=0x36aafe0) at thread/qthread_unix.cpp:331
#9  0x00007f85e879e6fa in start_thread (arg=0x7f85c6d01700) at pthread_create.c:333
#10 0x00007f85eb338b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f85eec078c0 (LWP 2494)):
[KCrash Handler]
#6  0x0000000000000020 in ?? ()
#7  0x00007f85ebc361e9 in QObject::disconnect (sender=0x1a70ee0, signal=0x30ab659 "destroyed()", signal@entry=0x7f85cf5d5332 "2destroyed()", receiver=receiver@entry=0x32392f0, method=0x3da82f9 "slotManagedTopLevelWidgetDestroyed()", method@entry=0x7f85cf5d61b0 "1slotManagedTopLevelWidgetDestroyed()") at kernel/qobject.cpp:2932
#8  0x00007f85cf5bb1b3 in KParts::PartManager::~PartManager (this=0x32392f0, __in_chrg=<optimized out>) at ../../src/partmanager.cpp:136
#9  0x00007f85cf5bb369 in KParts::PartManager::~PartManager (this=0x32392f0, __in_chrg=<optimized out>) at ../../src/partmanager.cpp:146
#10 0x00007f85ebc3052b in QObjectPrivate::deleteChildren (this=this@entry=0x435bf10) at kernel/qobject.cpp:1946
#11 0x00007f85ebc39da0 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1024
#12 0x00007f85cfcfe31b in KHTMLPart::~KHTMLPart (this=this@entry=0x3272f20, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../src/khtml_part.cpp:558
#13 0x00007f85cfcfe439 in KHTMLPart::~KHTMLPart (this=0x3272f20, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../src/khtml_part.cpp:606
#14 0x00007f85ebc32ec0 in QObject::event (this=0x3272f20, e=<optimized out>) at kernel/qobject.cpp:1230
#15 0x00007f85ed0d605c in QApplicationPrivate::notify_helper (this=this@entry=0x16ab5f0, receiver=receiver@entry=0x3272f20, e=e@entry=0x1bac340) at kernel/qapplication.cpp:3716
#16 0x00007f85ed0db516 in QApplication::notify (this=0x7ffdc6a423d0, receiver=0x3272f20, e=0x1bac340) at kernel/qapplication.cpp:3499
#17 0x00007f85ebc0362b in QCoreApplication::notifyInternal (this=0x7ffdc6a423d0, receiver=0x3272f20, event=event@entry=0x1bac340) at kernel/qcoreapplication.cpp:965
#18 0x00007f85ebc05a26 in QCoreApplication::sendEvent (event=0x1bac340, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x16aac70) at kernel/qcoreapplication.cpp:1593
#20 0x00007f85ebc05f08 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1451
#21 0x00007f85ebc59673 in postEventSourceDispatch (s=0x16ffe80) at kernel/qeventdispatcher_glib.cpp:271
#22 0x00007f85e827d127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f85e827d380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f85e827d42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f85ebc59a7f in QEventDispatcherGlib::processEvents (this=0x16ed680, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#26 0x00007f85ebc00dea in QEventLoop::exec (this=this@entry=0x7ffdc6a422b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#27 0x00007f85ebc08e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#28 0x00007f85ecb1cc3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#29 0x00007f85ed0d2495 in QApplication::exec () at kernel/qapplication.cpp:2976
#30 0x000000000040f7a1 in main (argc=1, argv=<optimized out>) at /build/systemsettings-3AmRXd/systemsettings-5.5.5/app/main.cpp:55

Possible duplicates by query: bug 362242, bug 362233, bug 362194, bug 362057, bug 359615.

Reported using DrKonqi