Application: kontact (5.7.3)

Qt Version: 5.9.5
Frameworks Version: 5.47.0
Operating System: Linux 4.15.0-34-generic x86_64
Distribution: Ubuntu 18.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Trying to start the application after a reboot. 

The application has just been configured with serveral accounts, I tried to reply to an email and crash. Now it won't start at all.

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 0x7f5a79110600 (LWP 4930))]

Thread 26 (Thread 0x7f592d233700 (LWP 4968)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x561bf3af45d0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x561bf3af4580, cond=0x561bf3af45a8) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x561bf3af45a8, mutex=0x561bf3af4580) at pthread_cond_wait.c:655
#3  0x00007f5a763da59b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5a763d2c0b in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f592e22180c in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/texttospeech/libqttexttospeech_flite.so
#6  0x00007f5a763d916d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5a718356db in start_thread (arg=0x7f592d233700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7f5940eca700 (LWP 4963)):
#0  0x00007f5a75aa60b4 in __GI___libc_read (fd=69, buf=0x7f5940ec9810, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f5a6f7f9980 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a6f7b4f27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a6f7b53e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f5a6f7b554c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f5a7661090b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5a765b59ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5a763d422a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5a763d916d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f5a718356db in start_thread (arg=0x7f5940eca700) at pthread_create.c:463
#10 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7f59416cb700 (LWP 4962)):
#0  0x00007f5a75aaabf9 in __GI___poll (fds=0x7f5934003ce0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5a6f7b5439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a6f7b554c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a7661090b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5a765b59ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5a763d422a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5a763d916d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5a718356db in start_thread (arg=0x7f59416cb700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7f594256a700 (LWP 4961)):
#0  0x00007f5a75aa60b4 in __GI___libc_read (fd=66, buf=0x7f5942569810, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f5a6f7f9980 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a6f7b4f27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a6f7b53e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f5a6f7b554c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f5a7661090b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5a765b59ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5a763d422a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5a763d916d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f5a718356db in start_thread (arg=0x7f594256a700) at pthread_create.c:463
#10 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7f59f4ff9700 (LWP 4959)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a6064dfb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a6064df68, cond=0x7f5a6064df90) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a6064df90, mutex=0x7f5a6064df68) at pthread_cond_wait.c:655
#3  0x00007f5a603575f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f5a60357639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f5a718356db in start_thread (arg=0x7f59f4ff9700) at pthread_create.c:463
#6  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7f59f57fa700 (LWP 4957)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x561bf360f848) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x561bf360f7f8, cond=0x561bf360f820) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x561bf360f820, mutex=0x561bf360f7f8) at pthread_cond_wait.c:655
#3  0x00007f5a66830c95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a66831177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a66831f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a718356db in start_thread (arg=0x7f59f57fa700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7f59f5ffb700 (LWP 4956)):
#0  0x00007f5a75ac66ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f5a75ac8474 in ___fprintf_chk (fp=0x7f5a75d838b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f5a5ef5b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f5a5ef439ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f5a5ef43b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f5a5ef4546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f5a5ef3b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f5a66801ab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a668324d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a718356db in start_thread (arg=0x7f59f5ffb700) at pthread_create.c:463
#12 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7f59f67fc700 (LWP 4955)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f59f67fb738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f59f67fb6e8, cond=0x7f59f67fb710) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f59f67fb710, mutex=0x7f59f67fb6e8) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a668324d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a718356db in start_thread (arg=0x7f59f67fc700) at pthread_create.c:463
#11 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f59f6ffd700 (LWP 4954)):
#0  0x00007f5a75aaabf9 in __GI___poll (fds=0x7f59dc007030, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5a424cb451 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007f5a424bce10 in pa_mainloop_poll () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007f5a424bd4a0 in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f5a424bd530 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f5a424cb399 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f5a420682a8 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#7  0x00007f5a718356db in start_thread (arg=0x7f59f6ffd700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f59f77fe700 (LWP 4953)):
#0  0x00007f5a7183bed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f59f77fd5d0, expected=0, futex_word=0x7f59f77fd758) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f5a7183bed9 in __pthread_cond_wait_common (abstime=0x7f59f77fd670, mutex=0x7f59f77fd708, cond=0x7f59f77fd730) at pthread_cond_wait.c:533
#2  0x00007f5a7183bed9 in __pthread_cond_timedwait (cond=0x7f59f77fd730, mutex=0x7f59f77fd708, abstime=0x7f59f77fd670) at pthread_cond_wait.c:667
#3  0x00007f5a6685f652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a6682691e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a6680152b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a668324d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a718356db in start_thread (arg=0x7f59f77fe700) at pthread_create.c:463
#11 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f59f7fff700 (LWP 4952)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x561bf361e3a8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x561bf361e2e8, cond=0x561bf361e380) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x561bf361e380, mutex=0x561bf361e2e8) at pthread_cond_wait.c:655
#3  0x00007f5a66fb8060 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a66831f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a718356db in start_thread (arg=0x7f59f7fff700) at pthread_create.c:463
#7  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f5a14ff9700 (LWP 4951)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x561bf360f848) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x561bf360f7f8, cond=0x561bf360f820) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x561bf360f820, mutex=0x561bf360f7f8) at pthread_cond_wait.c:655
#3  0x00007f5a66830c95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a66831177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a66831f11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a718356db in start_thread (arg=0x7f5a14ff9700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f5a157fa700 (LWP 4950)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a157f9738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a157f96e8, cond=0x7f5a157f9710) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a157f9710, mutex=0x7f5a157f96e8) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a668324d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a718356db in start_thread (arg=0x7f5a157fa700) at pthread_create.c:463
#11 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f5a15ffb700 (LWP 4949)):
#0  0x00007f5a75ac66ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f5a75ac8474 in ___fprintf_chk (fp=0x7f5a75d838b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f5a5ef5b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f5a5ef439ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f5a5ef43b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f5a5ef4546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f5a5ef3b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f5a66801ab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a660b8978 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a660b8f2b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a66832588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f5a718356db in start_thread (arg=0x7f5a15ffb700) at pthread_create.c:463
#14 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f5a167fc700 (LWP 4948)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a167fb358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a167fb308, cond=0x7f5a167fb330) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a167fb330, mutex=0x7f5a167fb308) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a660b88c8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a660b8f1b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a66832588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f5a718356db in start_thread (arg=0x7f5a167fc700) at pthread_create.c:463
#13 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f5a16ffd700 (LWP 4947)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a16ffc358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a16ffc308, cond=0x7f5a16ffc330) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a16ffc330, mutex=0x7f5a16ffc308) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a660b8818 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a660b8f0b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a66832588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f5a718356db in start_thread (arg=0x7f5a16ffd700) at pthread_create.c:463
#13 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f5a177fe700 (LWP 4946)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a177fd358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a177fd308, cond=0x7f5a177fd330) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a177fd330, mutex=0x7f5a177fd308) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a660b8768 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a660b8efb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a66832588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f5a718356db in start_thread (arg=0x7f5a177fe700) at pthread_create.c:463
#13 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f5a17fff700 (LWP 4945)):
#0  0x00007f5a75aa6187 in __GI___libc_write (fd=2, buf=0x7f5a17ffb6e0, nbytes=39) at ../sysdeps/unix/sysv/linux/write.c:27
#1  0x00007f5a75a211bd in _IO_new_file_write (f=0x7f5a75d82680 <_IO_2_1_stderr_>, data=0x7f5a17ffb6e0, n=39) at fileops.c:1203
#2  0x00007f5a75a21b2f in new_do_write (to_do=<optimized out>, data=0x7f5a17ffb6e0 "[warn] epoll_wait: Bad file descriptor\n", fp=0x7f5a75d82680 <_IO_2_1_stderr_>) at fileops.c:457
#3  0x00007f5a75a21b2f in _IO_new_file_xsputn (f=0x7f5a75d82680 <_IO_2_1_stderr_>, data=<optimized out>, n=39) at fileops.c:1277
#4  0x00007f5a759f4707 in buffered_vfprintf (s=s@entry=0x7f5a75d82680 <_IO_2_1_stderr_>, format=format@entry=0x7f5a5ef5b6a8 "[%s] %s\n", args=args@entry=0x7f5a17ffdca0) at vfprintf.c:2350
#5  0x00007f5a759f1726 in _IO_vfprintf_internal (s=s@entry=0x7f5a75d82680 <_IO_2_1_stderr_>, format=0x7f5a5ef5b6a8 "[%s] %s\n", ap=ap@entry=0x7f5a17ffdca0) at vfprintf.c:1301
#6  0x00007f5a75ac84c6 in ___fprintf_chk (fp=0x7f5a75d82680 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#7  0x00007f5a5ef439ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#8  0x00007f5a5ef43b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#9  0x00007f5a5ef4546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#10 0x00007f5a5ef3b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#11 0x00007f5a66801ab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007f5a660b86b8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007f5a660b8eeb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007f5a66832588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#18 0x00007f5a718356db in start_thread (arg=0x7f5a17fff700) at pthread_create.c:463
#19 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f5a34b7e700 (LWP 4944)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a34b7d358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a34b7d308, cond=0x7f5a34b7d330) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a34b7d330, mutex=0x7f5a34b7d308) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a660b8608 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a660b8edb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a66832588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f5a718356db in start_thread (arg=0x7f5a34b7e700) at pthread_create.c:463
#13 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f5a3537f700 (LWP 4943)):
#0  0x00007f5a7183bed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f5a3537e7e0, expected=0, futex_word=0x7f5a2c0047e0) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f5a7183bed9 in __pthread_cond_wait_common (abstime=0x7f5a3537e880, mutex=0x7f5a2c004790, cond=0x7f5a2c0047b8) at pthread_cond_wait.c:533
#2  0x00007f5a7183bed9 in __pthread_cond_timedwait (cond=0x7f5a2c0047b8, mutex=0x7f5a2c004790, abstime=0x7f5a3537e880) at pthread_cond_wait.c:667
#3  0x00007f5a6685f652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a66835799 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a66835cfb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a718356db in start_thread (arg=0x7f5a3537f700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f5a35b80700 (LWP 4942)):
#0  0x00007f5a7183bed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f5a35b7f7e0, expected=0, futex_word=0x7f5a2c0047e4) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f5a7183bed9 in __pthread_cond_wait_common (abstime=0x7f5a35b7f880, mutex=0x7f5a2c004790, cond=0x7f5a2c0047b8) at pthread_cond_wait.c:533
#2  0x00007f5a7183bed9 in __pthread_cond_timedwait (cond=0x7f5a2c0047b8, mutex=0x7f5a2c004790, abstime=0x7f5a35b7f880) at pthread_cond_wait.c:667
#3  0x00007f5a6685f652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a66835799 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a66835cfb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a718356db in start_thread (arg=0x7f5a35b80700) at pthread_create.c:463
#8  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f5a36381700 (LWP 4941)):
#0  0x00007f5a7183b9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f5a36380738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f5a7183b9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f5a363806e8, cond=0x7f5a36380710) at pthread_cond_wait.c:502
#2  0x00007f5a7183b9f3 in __pthread_cond_wait (cond=0x7f5a36380710, mutex=0x7f5a363806e8) at pthread_cond_wait.c:655
#3  0x00007f5a66826999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f5a668269c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f5a668014db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a668324d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a718356db in start_thread (arg=0x7f5a36381700) at pthread_create.c:463
#11 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f5a36b82700 (LWP 4940)):
#0  0x00007f5a75ac66ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f5a75ac8474 in ___fprintf_chk (fp=0x7f5a75d838b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f5a5ef5b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f5a5ef439ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f5a5ef43b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f5a5ef4546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f5a5ef3b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f5a66801b0d in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f5a667fdda8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f5a6681a77b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f5a668324d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f5a6682e5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f5a718356db in start_thread (arg=0x7f5a36b82700) at pthread_create.c:463
#12 0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f5a3d82f700 (LWP 4933)):
#0  0x00007f5a75aaabf9 in __GI___poll (fds=0x7f5a3801c3b0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5a6f7b5439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5a6f7b554c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5a7661090b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5a765b59ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5a763d422a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5a74d1cd45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f5a763d916d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5a718356db in start_thread (arg=0x7f5a3d82f700) at pthread_create.c:463
#9  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f5a490b5700 (LWP 4932)):
#0  0x00007f5a75aaabf9 in __GI___poll (fds=0x7f5a490b4928, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5a71273747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f5a7127536a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f5a4adb02a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f5a763d916d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5a718356db in start_thread (arg=0x7f5a490b5700) at pthread_create.c:463
#6  0x00007f5a75ab788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f5a79110600 (LWP 4930)):
[KCrash Handler]
#6  0x00007f5a76c6c01c in QTextLine::height() const () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#7  0x00007f5a76cb73b5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007f5a76cbbbed in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007f5a76cbc069 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007f5a76cbc268 in QTextDocumentLayout::doLayout(int, int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007f5a76cbd523 in QTextDocumentLayout::documentChanged(int, int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#12 0x00007f5a76c8798d in QTextDocument::markContentsDirty(int, int) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#13 0x00007f5a76cdbbf2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#14 0x00007f5a76cdc570 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#15 0x00007f5a76cdc700 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#16 0x00007f5a76cdc9d7 in QSyntaxHighlighter::rehighlight() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#17 0x00007f59cd81215d in KPIMTextEdit::RichTextEditor::setSpellCheckingLanguage(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5PimTextEdit.so.5abi2
#18 0x00007f5946a66353 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#19 0x00007f5a765e66cf in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f5a64ec07c2 in Sonnet::DictionaryComboBox::dictionaryChanged(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#21 0x00007f5a64ec0887 in  () at /usr/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#22 0x00007f5a64ec0b6d in Sonnet::DictionaryComboBox::assignDictionnaryName(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#23 0x00007f5946a7c5f8 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#24 0x00007f5946a7cd51 in  () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#25 0x00007f5946987747 in KMKernel::recoverDeadLetters() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#26 0x00007f5946d6d469 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kmailpart.so
#27 0x00007f5946d6dbe1 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kmailpart.so
#28 0x00007f5a77cb30e9 in KPluginFactory::create(char const*, QWidget*, QObject*, QList<QVariant> const&, QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#29 0x00007f5a7891ab1a in KontactInterface::Core::createPart(char const*) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#30 0x00007f594719e776 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kontact_kmailplugin.so
#31 0x00007f5a7891db3c in KontactInterface::Plugin::part() () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#32 0x00007f5a78b47e8c in Kontact::MainWindow::selectPlugin(KontactInterface::Plugin*) () at /usr/lib/x86_64-linux-gnu/libkontactprivate.so.5
#33 0x00007f5a78b467cc in Kontact::MainWindow::loadSettings() () at /usr/lib/x86_64-linux-gnu/libkontactprivate.so.5
#34 0x00007f5a78b4a535 in Kontact::MainWindow::initObject() () at /usr/lib/x86_64-linux-gnu/libkontactprivate.so.5
#35 0x00007f5a78b4acb8 in Kontact::MainWindow::MainWindow() () at /usr/lib/x86_64-linux-gnu/libkontactprivate.so.5
#36 0x0000561bf28412ec in  ()
#37 0x00007f5a789206ad in KontactInterface::PimUniqueApplication::start(QStringList const&, bool) () at /usr/lib/x86_64-linux-gnu/libKF5KontactInterface.so.5
#38 0x0000561bf28403e9 in  ()
#39 0x00007f5a759b7b97 in __libc_start_main (main=0x561bf283f630, argc=1, argv=0x7ffd75d95e18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd75d95e08) at ../csu/libc-start.c:310
#40 0x0000561bf2840aea in _start ()

Reported using DrKonqi