Application: kontact (5.2.3)

Qt Version: 5.7.1
Frameworks Version: 5.31.0
Operating System: Linux 4.10.0-42-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:
Writing an email, clicking the "Select" button for "To:" address.
Sometimes it simply crashes.  Sometimes it crashes when I click in the search bar and start typing.  It seems to "be more likely to crash" during certain periods of time.  Not sure if that clears up over time, or after logout/reboot, or shutting down akonadi.  I'v not been able to figure that part out yet.  It's been going on for some time (quite a few months)

- Custom settings of the application:
Google Contacts (and other Google servicesin Akonadi).

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f529b15a100 (LWP 29052))]

Thread 29 (Thread 0x7f51b68a0700 (LWP 30360)):
#0  0x00007f52989609f8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f528f261f89 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f262514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51b68a0700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 28 (Thread 0x7f51c5822700 (LWP 30358)):
#0  0x00007f5297e238ad in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f528f2a6b30 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f262042 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f262514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f52910306da in start_thread (arg=0x7f51c5822700) at pthread_create.c:456
#10 0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 27 (Thread 0x7f51b70a1700 (LWP 30151)):
#0  0x00007f528f25f599 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261a0b in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26249b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51b70a1700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 26 (Thread 0x7f51b78a2700 (LWP 30137)):
#0  0x00007f528f2a7ef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261a60 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26249b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51b78a2700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 25 (Thread 0x7f51c6023700 (LWP 29182)):
#0  0x00007f528f2a7ed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261a79 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26249b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51c6023700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 24 (Thread 0x7f51c77fe700 (LWP 29164)):
#0  0x00007f528f2a7ef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f26241d in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52910306da in start_thread (arg=0x7f51c77fe700) at pthread_create.c:456
#8  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 23 (Thread 0x7f51c7fff700 (LWP 29162)):
#0  0x00007f528f2a7ed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f262470 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52910306da in start_thread (arg=0x7f51c7fff700) at pthread_create.c:456
#8  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 22 (Thread 0x7f51ddbdb700 (LWP 29157)):
#0  0x00007f5297e27d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f528f262576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52910306da in start_thread (arg=0x7f51ddbdb700) at pthread_create.c:456
#8  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 21 (Thread 0x7f51de3dc700 (LWP 29155)):
#0  0x00007f528f2a7ef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261f81 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f262514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51de3dc700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 20 (Thread 0x7f51debdd700 (LWP 29152)):
#0  0x00007f5297e27d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f528f262576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52910306da in start_thread (arg=0x7f51debdd700) at pthread_create.c:456
#8  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 19 (Thread 0x7f51df7fe700 (LWP 29148)):
#0  0x00007f528f2a7ed0 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f262532 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52910306da in start_thread (arg=0x7f51df7fe700) at pthread_create.c:456
#8  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 18 (Thread 0x7f51dffff700 (LWP 29146)):
#0  0x00007fffb5913949 in  ()
#1  0x00007fffb5913bd9 in clock_gettime ()
#2  0x00007f5297e42506 in __GI___clock_gettime (clock_id=1, tp=0x7f51dfffe9e0) at ../sysdeps/unix/clock_gettime.c:115
#3  0x00007f52987e2c41 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529895ed39 in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529895f2e5 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529896068e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f528f261a6d in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f528f26249b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f52910306da in start_thread (arg=0x7f51dffff700) at pthread_create.c:456
#15 0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7f51ebded700 (LWP 29126)):
#0  0x00007f528f2a7ed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261947 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26249b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51ebded700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7f51f9ba0700 (LWP 29123)):
#0  0x00007f528f2a7ed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261f94 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f262514 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51f9ba0700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7f51fa5bf700 (LWP 29120)):
#0  0x00007f5298734da3 in QMutex::lock() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f529896082f in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f528f261a6d in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26249b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f52910306da in start_thread (arg=0x7f51fa5bf700) at pthread_create.c:456
#10 0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7f51fadc0700 (LWP 29118)):
#0  0x00007f5297e41d8f in __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:67
#1  0x00007f5297e27d82 in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007f528f262576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51fadc0700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7f51fb5c1700 (LWP 29116)):
#0  0x00007f528f2a7ef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f261d99 in g_main_context_query () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f2624e8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f51fb5c1700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7f5220de2700 (LWP 29106)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542f8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f5220de2700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7f52215e3700 (LWP 29105)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542f8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f52215e3700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7f5221de4700 (LWP 29104)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542f8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f5221de4700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7f52225e5700 (LWP 29103)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542f8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f52225e5700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7f5222de6700 (LWP 29102)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542f8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f5222de6700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f52235e7700 (LWP 29101)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542f8d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f52235e7700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f5223de8700 (LWP 29100)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529542e7b1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295757641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f5223de8700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f522a866700 (LWP 29095)):
#0  0x00007f528f2a7ed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f262470 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52910306da in start_thread (arg=0x7f522a866700) at pthread_create.c:456
#8  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f527274b700 (LWP 29091)):
#0  0x00007f5291036510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f529572694b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f5295726989 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f52910306da in start_thread (arg=0x7f527274b700) at pthread_create.c:456
#4  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f527395c700 (LWP 29090)):
#0  0x00007f528f261da7 in g_main_context_query () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f528f2624e8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f52989610bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5298738f83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f529702e5d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52910306da in start_thread (arg=0x7f527395c700) at pthread_create.c:456
#9  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f527bbd9700 (LWP 29077)):
#0  0x00007f5297e27d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f529165cc62 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f529165e8d7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f527df2bef9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f529873dc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f52910306da in start_thread (arg=0x7f527bbd9700) at pthread_create.c:456
#6  0x00007f5297e33d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f529b15a100 (LWP 29052)):
[KCrash Handler]
#6  0x00007f52988d38e8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f52988d98e0 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f52988db4a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f5298938789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f52989af47c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f52988d9832 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f52988db4a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f5298938789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f52989af47c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f529742957f in Akonadi::EntityTreeModelPrivate::dataChanged(QModelIndex const&, QModelIndex const&) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#16 0x00007f529742cac8 in Akonadi::EntityTreeModelPrivate::itemFetchJobDone(KJob*) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#17 0x00007f5298938789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f5299f763d2 in KJob::result(KJob*, KJob::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#19 0x00007f5299f77d11 in KJob::finishJob(bool) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#20 0x00007f52973e7bc9 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#21 0x00007f5298939639 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f529983335c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f529983ab21 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f529890cc00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f529890f39d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f5298960c93 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f528f262377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f528f2625e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f528f26268c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f529896109f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f529890abea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f529891333c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x000055e21c5752bf in  ()
#34 0x00007f5297d4b3f1 in __libc_start_main (main=0x55e21c574320, argc=1, argv=0x7fffb5900a38, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffb5900a28) at ../csu/libc-start.c:291
#35 0x000055e21c5757ca in _start ()

Reported using DrKonqi