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).

The crash can be reproduced sometimes.

-- 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 0x7f921f3bd100 (LWP 17242))]

Thread 32 (Thread 0x7f90e7fff700 (LWP 27507)):
#0  0x00007f921350aed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c4947 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c549b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f92152936da in start_thread (arg=0x7f90e7fff700) at pthread_create.c:456
#9  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 31 (Thread 0x7f9124e1c700 (LWP 27505)):
#0  0x00007f92134c4ce1 in g_main_context_query () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c54e8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f9124e1c700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 30 (Thread 0x7f9137fff700 (LWP 4899)):
#0  0x00007f921350aed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c4a79 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c549b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f92152936da in start_thread (arg=0x7f9137fff700) at pthread_create.c:456
#9  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 29 (Thread 0x7f91356c7700 (LWP 4897)):
#0  0x00007f921350aed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c4594 in g_main_context_release () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c552a in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f92152936da in start_thread (arg=0x7f91356c7700) at pthread_create.c:456
#9  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 28 (Thread 0x7f91116cb700 (LWP 4895)):
#0  0x00007f921cbc233a in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f921cbc368e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f92134c4a6d in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c549b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f92152936da in start_thread (arg=0x7f91116cb700) at pthread_create.c:456
#10 0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 27 (Thread 0x7f9110eca700 (LWP 4893)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f9110eca700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 26 (Thread 0x7f9151420700 (LWP 19059)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f9151420700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 25 (Thread 0x7f91522e7700 (LWP 19056)):
#0  0x00007f92134c53fb in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f92152936da in start_thread (arg=0x7f91522e7700) at pthread_create.c:456
#7  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 24 (Thread 0x7f9152ffd700 (LWP 17604)):
#0  0x00007f921350aef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c552a in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f9152ffd700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 23 (Thread 0x7f91537fe700 (LWP 17602)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f91537fe700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 22 (Thread 0x7f9153fff700 (LWP 17600)):
#0  0x00007f921350aef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c4b70 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c549b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f92152936da in start_thread (arg=0x7f9153fff700) at pthread_create.c:456
#9  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 21 (Thread 0x7f9168917700 (LWP 17598)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f9168917700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 20 (Thread 0x7f9169118700 (LWP 17596)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f9169118700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 19 (Thread 0x7f9169919700 (LWP 17594)):
#0  0x00007f921350aed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c4a79 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c549b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f92152936da in start_thread (arg=0x7f9169919700) at pthread_create.c:456
#9  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 18 (Thread 0x7f916a11a700 (LWP 17592)):
#0  0x00007f921350aed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c5678 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f92152936da in start_thread (arg=0x7f916a11a700) at pthread_create.c:456
#7  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7f916a91b700 (LWP 17590)):
#0  0x00007f921350aef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c548e in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f916a91b700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7f916b11c700 (LWP 17587)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f916b11c700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7f917ce31700 (LWP 17262)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f917ce31700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7f917edf0700 (LWP 17257)):
#0  0x00007f921c0a4d8f in __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:67
#1  0x00007f921c08ad82 in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f92152936da in start_thread (arg=0x7f917edf0700) at pthread_create.c:456
#9  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7f917f5f1700 (LWP 17256)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f917f5f1700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7f91a4df1700 (LWP 17253)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196928d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a4df1700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7f91a55f2700 (LWP 17252)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196928d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a55f2700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7f91a5df3700 (LWP 17251)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196928d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a5df3700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7f91a65f4700 (LWP 17250)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196928d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a65f4700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7f91a6df5700 (LWP 17249)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196928d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a6df5700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f91a75f6700 (LWP 17248)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196928d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a75f6700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f91a7df7700 (LWP 17247)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f92196917b1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f92199ba641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91a7df7700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f91aea6b700 (LWP 17246)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92134c5576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f92152936da in start_thread (arg=0x7f91aea6b700) at pthread_create.c:456
#8  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f91f6957700 (LWP 17245)):
#0  0x00007f9215299510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f921998994b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f9219989989 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f92152936da in start_thread (arg=0x7f91f6957700) at pthread_create.c:456
#4  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f91f7b68700 (LWP 17244)):
#0  0x00007f921350aed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f92134c4a79 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f92134c549b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f921cbc40bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f921c99bf83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921b2915d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f92152936da in start_thread (arg=0x7f91f7b68700) at pthread_create.c:456
#10 0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f91ffe3c700 (LWP 17243)):
#0  0x00007f921c08ad8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f92158bfc62 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f92158c18d7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f920218eef9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f921c9a0c38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f92152936da in start_thread (arg=0x7f91ffe3c700) at pthread_create.c:456
#6  0x00007f921c096d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f921f3bd100 (LWP 17242)):
[KCrash Handler]
#6  0x00007f921cb368e8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f921cb3c8e0 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f921cb3e4a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f921cb9b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f921cc1247c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f921cb3c832 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f921cb3e4a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f921cb9b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f921cc1247c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f921b68c57f in Akonadi::EntityTreeModelPrivate::dataChanged(QModelIndex const&, QModelIndex const&) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#16 0x00007f921b68fac8 in Akonadi::EntityTreeModelPrivate::itemFetchJobDone(KJob*) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#17 0x00007f921cb9b789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f921e1d93d2 in KJob::result(KJob*, KJob::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#19 0x00007f921e1dad11 in KJob::finishJob(bool) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#20 0x00007f921b64abc9 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#21 0x00007f921cb9c639 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f921da9635c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f921da9db21 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f921cb6fc00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f921cb7239d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f921cbc3c93 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f92134c5377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f92134c55e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f92134c568c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f921cbc409f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f921cb6dbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f921cb7633c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x0000564219c292bf in  ()
#34 0x00007f921bfae3f1 in __libc_start_main (main=0x564219c28320, argc=1, argv=0x7ffccc6e5a28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffccc6e5a18) at ../csu/libc-start.c:291
#35 0x0000564219c297ca in _start ()

Reported using DrKonqi