Application: kontact (5.4.3)

Qt Version: 5.7.1
Frameworks Version: 5.38.0
Operating System: Linux 4.10.0-40-generic x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
- What I was doing when the application crashed:
1. New e-mail
2. Click "Choose" next "TO" field
3. Type whatever in serach box causes Kontack crash.

The crash can be reproduced every time.

-- 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 0x7f7c8ae4eb80 (LWP 21781))]

Thread 32 (Thread 0x7f7c4ca21700 (LWP 24333)):
#0  0x00007f7c87989d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7c8164c576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7c884c30bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8829af83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c8383f6da in start_thread (arg=0x7f7c4ca21700) at pthread_create.c:456
#8  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 31 (Thread 0x7f7ae1058700 (LWP 21854)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7b505748d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7b5089c641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7c8383f6da in start_thread (arg=0x7f7ae1058700) at pthread_create.c:456
#4  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 30 (Thread 0x7f7ae1859700 (LWP 21853)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7b505748d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7b5089c641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7c8383f6da in start_thread (arg=0x7f7ae1859700) at pthread_create.c:456
#4  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 29 (Thread 0x7f7ae205a700 (LWP 21852)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7b505748d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7b5089c641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7c8383f6da in start_thread (arg=0x7f7ae205a700) at pthread_create.c:456
#4  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 28 (Thread 0x7f7ae285b700 (LWP 21851)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7b505737b1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7b5089c641 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7c8383f6da in start_thread (arg=0x7f7ae285b700) at pthread_create.c:456
#4  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 27 (Thread 0x7f7b2305e700 (LWP 21850)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7b5086b94b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007f7b5086b989 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007f7c8383f6da in start_thread (arg=0x7f7b2305e700) at pthread_create.c:456
#4  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 26 (Thread 0x7f7b2ae33700 (LWP 21848)):
#0  0x00007f7c81691ed9 in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7c8164ba79 in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7c8164c49b in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7c884c30bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7c8829af83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7b2ae33700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 25 (Thread 0x7f7b47172700 (LWP 21817)):
#0  0x00007f7c87989d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7c8164c576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7c884c30bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8829af83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c8383f6da in start_thread (arg=0x7f7b47172700) at pthread_create.c:456
#8  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 24 (Thread 0x7f7b47973700 (LWP 21816)):
#0  0x00007f7c87989d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7c8164c576 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7c884c30bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8829af83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c8383f6da in start_thread (arg=0x7f7b47973700) at pthread_create.c:456
#8  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 23 (Thread 0x7f7b4c9ef700 (LWP 21815)):
#0  0x00007f7c81691ef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7c8164c10a in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7c8164c5e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7c884c30bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7c8829af83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7b4c9ef700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 22 (Thread 0x7f7be67fc700 (LWP 21811)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c734202c4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f7c73420309 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f7c8383f6da in start_thread (arg=0x7f7be67fc700) at pthread_create.c:456
#4  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 21 (Thread 0x7f7be6ffd700 (LWP 21809)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a764c09 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a765209 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a7653c0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c8383f6da in start_thread (arg=0x7f7be6ffd700) at pthread_create.c:456
#6  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 20 (Thread 0x7f7be77fe700 (LWP 21808)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a764c09 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a765209 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a7653c0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c8383f6da in start_thread (arg=0x7f7be77fe700) at pthread_create.c:456
#6  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 19 (Thread 0x7f7be7fff700 (LWP 21807)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a764c09 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a765209 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a7653c0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c8383f6da in start_thread (arg=0x7f7be7fff700) at pthread_create.c:456
#6  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 18 (Thread 0x7f7c18ff9700 (LWP 21806)):
#0  0x00007f7c879a3d3c in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f7c879a5944 in ___fprintf_chk (fp=0x7f7c87c50750 <_IO_stdfile_2_lock>, flag=1, format=0x7f7c7192b7b4 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f7c7191351e in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#3  0x00007f7c71913714 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007f7c71917d38 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007f7c71901efa in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007f7c7a7101fe in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f7c8383f6da in start_thread (arg=0x7f7c18ff9700) at pthread_create.c:456
#12 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7f7c197fa700 (LWP 21805)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a7598c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759995 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a7f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7c197fa700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7f7c19ffb700 (LWP 21804)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a23ece0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a226dd0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a22716b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a2229ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7b5c256e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c7b5c4a04 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7b5c4a55 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7b5c4b39 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f7c8383f6da in start_thread (arg=0x7f7c19ffb700) at pthread_create.c:456
#14 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7f7c1a7fc700 (LWP 21803)):
#0  0x00007f7c5c8b8ced in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-10.0.so
#1  0x00007f7c5c8b9079 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-10.0.so
#2  0x00007f7c5c8b98fa in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-10.0.so
#3  0x00007f7c5cd1f8ac in pa_mainloop_dispatch () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f7c5cd1fcac in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f7c5cd1fd50 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f7c5cd2dd39 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#7  0x00007f7c5c8c97d8 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-10.0.so
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7c1a7fc700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7f7c1affd700 (LWP 21802)):
#0  0x00007f7c838458b9 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f7c7a7590a2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759955 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a841 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7c1affd700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7f7c1b7fe700 (LWP 21801)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c79d1d4cd in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a76529e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a7653c0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c8383f6da in start_thread (arg=0x7f7c1b7fe700) at pthread_create.c:456
#6  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7f7c1bfff700 (LWP 21800)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a7598c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759995 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a7f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7c1bfff700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7f7c3cff9700 (LWP 21799)):
#0  0x00007f7c8798590d in write () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7c879078e7 in _IO_new_file_write (f=0x7f7c87c4f520 <_IO_2_1_stderr_>, data=0x7f7c3cff58e0, n=45) at fileops.c:1271
#2  0x00007f7c879081f8 in new_do_write (to_do=<optimized out>, data=0x7f7c3cff58e0 "[warn] epoll_wait: B\305\202\304\231dny deskryptor pliku\n", fp=0x7f7c87c4f520 <_IO_2_1_stderr_>) at fileops.c:526
#3  0x00007f7c879081f8 in _IO_new_file_xsputn (f=0x7f7c87c4f520 <_IO_2_1_stderr_>, data=<optimized out>, n=45) at fileops.c:1350
#4  0x00007f7c878dd8d5 in buffered_vfprintf (s=0x7f7c87c4f520 <_IO_2_1_stderr_>, format=<optimized out>, args=<optimized out>) at vfprintf.c:2346
#5  0x00007f7c878daa85 in _IO_vfprintf_internal (s=s@entry=0x7f7c87c4f520 <_IO_2_1_stderr_>, format=0x7f7c7192b7b4 "[%s] %s\n", ap=ap@entry=0x7f7c3cff7e78) at vfprintf.c:1293
#6  0x00007f7c879a5999 in ___fprintf_chk (fp=0x7f7c87c4f520 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#7  0x00007f7c7191351e in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#8  0x00007f7c71913714 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#9  0x00007f7c71917d38 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#10 0x00007f7c71901efa in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#11 0x00007f7c7a7101fe in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007f7c79924808 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007f7c7992494b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007f7c7a765a68 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#18 0x00007f7c8383f6da in start_thread (arg=0x7f7c3cff9700) at pthread_create.c:456
#19 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7f7c3d7fa700 (LWP 21798)):
#0  0x00007f7c879a3d3c in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f7c879a5944 in ___fprintf_chk (fp=0x7f7c87c50750 <_IO_stdfile_2_lock>, flag=1, format=0x7f7c7192b7b4 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f7c7191351e in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#3  0x00007f7c71913714 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007f7c71917d38 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007f7c71901efa in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007f7c7a7101fe in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c79924758 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c799249ab in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f7c7a765a68 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f7c8383f6da in start_thread (arg=0x7f7c3d7fa700) at pthread_create.c:456
#14 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7f7c3dffb700 (LWP 21797)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a7598c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759995 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a7f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c799246a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7992499b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a765a68 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c8383f6da in start_thread (arg=0x7f7c3dffb700) at pthread_create.c:456
#11 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7f7c3e7fc700 (LWP 21796)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a7598c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759995 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a7f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c799245f8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7992498b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a765a68 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c8383f6da in start_thread (arg=0x7f7c3e7fc700) at pthread_create.c:456
#11 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f7c3effd700 (LWP 21795)):
#0  0x00007f7c879a3d3c in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f7c879a5944 in ___fprintf_chk (fp=0x7f7c87c50750 <_IO_stdfile_2_lock>, flag=1, format=0x7f7c7192b7b4 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f7c7191351e in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#3  0x00007f7c71913714 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007f7c71917d38 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007f7c71901efa in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007f7c7a7101fe in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c79924548 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c7992497b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f7c7a765a68 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f7c8383f6da in start_thread (arg=0x7f7c3effd700) at pthread_create.c:456
#14 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f7c3f7fe700 (LWP 21794)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a7598c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759995 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a7f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c79924498 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7992496b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a765a68 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c8383f6da in start_thread (arg=0x7f7c3f7fe700) at pthread_create.c:456
#11 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f7c4d222700 (LWP 21791)):
#0  0x00007f7c83845510 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f7c7a7598c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f7c7a759995 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f7c7a73a7f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c8383f6da in start_thread (arg=0x7f7c4d222700) at pthread_create.c:456
#9  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f7c4dc30700 (LWP 21790)):
#0  0x00007f7c879a3d69 in __lll_unlock_wake_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:341
#1  0x00007f7c879a59eb in _IO_acquire_lock_clear_flags2_fct (p=<synthetic pointer>) at ../libio/libioP.h:873
#2  0x00007f7c879a59eb in ___fprintf_chk (fp=0x7f7c87c4f520 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:30
#3  0x00007f7c7191351e in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007f7c71913714 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007f7c71917d38 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007f7c71901efa in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#7  0x00007f7c7a7101fe in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f7c7a74ca84 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f7c7a7369d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f7c7a7659ea in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f7c7a761d5c in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f7c8383f6da in start_thread (arg=0x7f7c4dc30700) at pthread_create.c:456
#13 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f7c5500e700 (LWP 21783)):
#0  0x00007f7c81691ef4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7c8164b4be in g_main_context_acquire () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7c8164c425 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7c884c30bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7c8829af83 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c86b885d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7c8383f6da in start_thread (arg=0x7f7c5500e700) at pthread_create.c:456
#10 0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f7c5ef5e700 (LWP 21782)):
#0  0x00007f7c87989d8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f7c83316c62 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f7c833188d7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f7c60a4fef9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f7c8829fc38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7c8383f6da in start_thread (arg=0x7f7c5ef5e700) at pthread_create.c:456
#6  0x00007f7c87995d7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f7c8ae4eb80 (LWP 21781)):
[KCrash Handler]
#6  0x00007f7c884358e8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7c8843b8e0 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7c8843d4a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7c8849a789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f7c8851147c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f7c8843b832 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f7c8843d4a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f7c8849a789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f7c8851147c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f7c86f8b972 in Akonadi::EntityTreeModelPrivate::dataChanged(QModelIndex const&, QModelIndex const&) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#16 0x00007f7c86f8eeb5 in Akonadi::EntityTreeModelPrivate::itemFetchJobDone(KJob*) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#17 0x00007f7c8849a789 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f7c89ad2f82 in KJob::result(KJob*, KJob::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#19 0x00007f7c89ad48c1 in KJob::finishJob(bool) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#20 0x00007f7c86f4a169 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#21 0x00007f7c8849b639 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f7c8914535c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f7c8914cb21 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f7c8846ec00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f7c8847139d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f7c884c2c93 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f7c8164c377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f7c8164c5e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f7c8164c68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f7c884c309f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f7c8846cbea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f7c8847533c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x0000556d2d0b4347 in  ()
#34 0x00007f7c878ad3f1 in __libc_start_main (main=0x556d2d0b3380, argc=1, argv=0x7fffcdff6478, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffcdff6468) at ../csu/libc-start.c:291
#35 0x0000556d2d0b486a in _start ()

Reported using DrKonqi