Application: systemsettings5 (5.5.4)

Qt Version: 5.5.1
Operating System: Linux 4.4.1 x86_64
Distribution (Platform): Slackware Packages

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

systemsettings crashed when tryting to set automatic date / time change in Regininal Settings.
When try to set NTP server and/or change time zone systemsettings5 shows error message like "Unable to authenticate/execute the action: 4, " after providing root password.
After showing the error - it crashes on exit (either with Alt+F4 or by clicking on close button in titlebar).

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f871d65c7c0 (LWP 20709))]

Thread 5 (Thread 0x7f870aa46700 (LWP 20710)):
#0  0x00007f871798b4fd in poll () at /lib64/libc.so.6
#1  0x00007f87144c9102 in  () at /usr/lib64/libxcb.so.1
#2  0x00007f87144cac8f in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007f870c88ca49 in  () at /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007f871859ff3f in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007f8713c76704 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f8717996f8d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f86e3fff700 (LWP 20736)):
#0  0x00007f871798b4fd in poll () at /lib64/libc.so.6
#1  0x00007f87132e7954 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f87132e7a5c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f87132e7a99 in  () at /usr/lib64/libglib-2.0.so.0
#4  0x00007f871330d1e5 in  () at /usr/lib64/libglib-2.0.so.0
#5  0x00007f8713c76704 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f8717996f8d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f86e319e700 (LWP 20737)):
#0  0x00007f871798b4fd in poll () at /lib64/libc.so.6
#1  0x00007f87132e7954 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f87132e7cd2 in g_main_loop_run () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f86ecc7ba56 in  () at /usr/lib64/../lib64/libgio-2.0.so.0
#4  0x00007f871330d1e5 in  () at /usr/lib64/libglib-2.0.so.0
#5  0x00007f8713c76704 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f8717996f8d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f86ded7e700 (LWP 20767)):
#0  0x00007f8717991139 in syscall () at /lib64/libc.so.6
#1  0x00007f871332aa34 in g_cond_wait_until () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f87132bd319 in  () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f87132bd90b in g_async_queue_timeout_pop () at /usr/lib64/libglib-2.0.so.0
#4  0x00007f871330dc2a in  () at /usr/lib64/libglib-2.0.so.0
#5  0x00007f871330d1e5 in  () at /usr/lib64/libglib-2.0.so.0
#6  0x00007f8713c76704 in start_thread () at /lib64/libpthread.so.0
#7  0x00007f8717996f8d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f871d65c7c0 (LWP 20709)):
[KCrash Handler]
#6  0x0000000000000050 in  ()
#7  0x00007f87187a1479 in QObject::disconnect(QObject const*, char const*, QObject const*, char const*) () at /usr/lib64/libQt5Core.so.5
#8  0x00007f86f79fb576 in KParts::PartManager::~PartManager() () at /usr/lib64/libKF5Parts.so.5
#9  0x00007f86f79fb709 in KParts::PartManager::~PartManager() () at /usr/lib64/libKF5Parts.so.5
#10 0x00007f871879b76b in QObjectPrivate::deleteChildren() () at /usr/lib64/libQt5Core.so.5
#11 0x00007f87187a4f70 in QObject::~QObject() () at /usr/lib64/libQt5Core.so.5
#12 0x00007f86f81492fb in KHTMLPart::~KHTMLPart() () at /usr/lib64/libKF5KHtml.so.5
#13 0x00007f86f81493f9 in KHTMLPart::~KHTMLPart() () at /usr/lib64/libKF5KHtml.so.5
#14 0x00007f871879dfa0 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#15 0x00007f871a53b11c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#16 0x00007f871a540236 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#17 0x00007f87187703f3 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#18 0x00007f8718772716 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#19 0x00007f87187c3813 in  () at /usr/lib64/libQt5Core.so.5
#20 0x00007f87132e7787 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#21 0x00007f87132e79b8 in  () at /usr/lib64/libglib-2.0.so.0
#22 0x00007f87132e7a5c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#23 0x00007f87187c3c1f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#24 0x00007f871876df5a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#25 0x00007f8718775aed in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#26 0x000000000040fd2e in main ()

Reported using DrKonqi