Application: kontact (5.10.1)
 (Compiled from sources)
Qt Version: 5.12.3
Frameworks Version: 5.59.0
Operating System: Linux 4.15.0-54-generic x86_64
Distribution: KDE neon User Edition 5.16

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

I was looking on an article of the UNI Oldenburg in Akregator when I noticed social-media buttons. I've klicked on the button to youtube when it crashed. The same happens with other buttons.
This behaviour only occurs when using left-click, middleclick opens the webpage in a new tab flawlessly.

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 0x7f222156fbc0 (LWP 2609))]

Thread 23 (Thread 0x7f20c5728700 (LWP 4434)):
#0  0x00007f2219784ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f20c5727710, expected=0, futex_word=0x7f20c57278f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f2219784ed9 in __pthread_cond_wait_common (abstime=0x7f20c57277b0, mutex=0x7f20c57278a8, cond=0x7f20c57278d0) at pthread_cond_wait.c:533
#2  0x00007f2219784ed9 in __pthread_cond_timedwait (cond=0x7f20c57278d0, mutex=0x7f20c57278a8, abstime=0x7f20c57277b0) at pthread_cond_wait.c:667
#3  0x00007f220ef60b17 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220ef6146a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220ef61552 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef21fb1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef244c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef24ab4 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f20c5728700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7f20b5a73700 (LWP 2788)):
#0  0x00007f2219784ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f20b5a72710, expected=0, futex_word=0x7f20b5a728f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f2219784ed9 in __pthread_cond_wait_common (abstime=0x7f20b5a727b0, mutex=0x7f20b5a728a8, cond=0x7f20b5a728d0) at pthread_cond_wait.c:533
#2  0x00007f2219784ed9 in __pthread_cond_timedwait (cond=0x7f20b5a728d0, mutex=0x7f20b5a728a8, abstime=0x7f20b5a727b0) at pthread_cond_wait.c:667
#3  0x00007f220ef60b17 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220ef6146a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220ef61552 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef21fb1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef247f6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef24ab4 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f20b5a73700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7f20ce7e4700 (LWP 2711)):
#0  0x00007f221de7c0b4 in __GI___libc_read (fd=143, buf=0x7f20ce7e37d0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f22178f7000 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22178b1fb7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f22178b2470 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f221e9dbdcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f20c8000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f20ce7e39e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#7  0x00007f221e7a44ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#8  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x557c883b9970) at thread/qthread_unix.cpp:361
#9  0x00007f221977e6db in start_thread (arg=0x7f20ce7e4700) at pthread_create.c:463
#10 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7f20e2063700 (LWP 2659)):
#0  0x00007f221de80bf9 in __GI___poll (fds=0x7f20d80049b0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f22178b24c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f221e9dbdcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f20d8000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f20e20629e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#5  0x00007f221e7a44ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#6  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x557c877f15f0) at thread/qthread_unix.cpp:361
#7  0x00007f221977e6db in start_thread (arg=0x7f20e2063700) at pthread_create.c:463
#8  0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7f20ef7fe700 (LWP 2649)):
#0  0x00007f221de80bf9 in __GI___poll (fds=0x7f20dc0061a0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f22178b24c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f221e9dbdcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f20dc000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f20ef7fd9e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#5  0x00007f221e7a44ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#6  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x557c875c4100) at thread/qthread_unix.cpp:361
#7  0x00007f221977e6db in start_thread (arg=0x7f20ef7fe700) at pthread_create.c:463
#8  0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f20effff700 (LWP 2648)):
#0  0x00007f221de7c0b4 in __GI___libc_read (fd=92, buf=0x7f20efffe7d0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f22178f7000 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22178b1fb7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f22178b2470 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f221e9dbdcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f20e4000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f20efffe9e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#7  0x00007f221e7a44ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#8  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x557c875d4380) at thread/qthread_unix.cpp:361
#9  0x00007f221977e6db in start_thread (arg=0x7f20effff700) at pthread_create.c:463
#10 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f20f4ea0700 (LWP 2647)):
#0  0x00007f221de7c0b4 in __GI___libc_read (fd=90, buf=0x7f20f4e9f7d0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f22178f7000 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22178b1fb7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f22178b2470 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f221e9dbdcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f20e8000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f20f4e9f9e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#7  0x00007f221e7a44ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#8  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x557c875bb950) at thread/qthread_unix.cpp:361
#9  0x00007f221977e6db in start_thread (arg=0x7f20f4ea0700) at pthread_create.c:463
#10 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f2106fa4700 (LWP 2634)):
#0  0x00007f22197849f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f2106fa3908) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f22197849f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f2106fa38b8, cond=0x7f2106fa38e0) at pthread_cond_wait.c:502
#2  0x00007f22197849f3 in __pthread_cond_wait (cond=0x7f2106fa38e0, mutex=0x7f2106fa38b8) at pthread_cond_wait.c:655
#3  0x00007f220ef60a49 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220ef61478 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220ef6150f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef21fc8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef247f6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef24b34 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f2106fa4700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f21077a5700 (LWP 2633)):
#0  0x00007f221de9c6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f221de9e474 in ___fprintf_chk (fp=0x7f221e1598b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f220659b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f22065839ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f2206583b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f220658546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f220657b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f220ef66db4 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef33311 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f21077a5700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f21b10f3700 (LWP 2632)):
#0  0x00007f22197849f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f2207cc2fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f22197849f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f2207cc2f68, cond=0x7f2207cc2f90) at pthread_cond_wait.c:502
#2  0x00007f22197849f3 in __pthread_cond_wait (cond=0x7f2207cc2f90, mutex=0x7f2207cc2f68) at pthread_cond_wait.c:655
#3  0x00007f22079cc844 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f22079cc889 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f221977e6db in start_thread (arg=0x7f21b10f3700) at pthread_create.c:463
#6  0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f21b1964700 (LWP 2631)):
#0  0x00007f21cc5b97e6 in pa_atomic_load (a=<optimized out>) at ./pulsecore/atomic.h:55
#1  0x00007f21cc5b97e6 in do_read (p=p@entry=0x7f2194000bc0, re=re@entry=0x7f2194000d88) at pulsecore/pstream.c:856
#2  0x00007f21cc5bc71b in do_pstream_read_write (p=0x7f2194000bc0) at pulsecore/pstream.c:248
#3  0x00007f21cc5bcab9 in srb_callback (srb=<optimized out>, userdata=0x7f2194000bc0) at pulsecore/pstream.c:287
#4  0x00007f21cc5bd33f in srbchannel_rwloop (sr=0x7f219400bbe0) at pulsecore/srbchannel.c:190
#5  0x00007f21e409b108 in dispatch_pollfds (m=0x557c8734cbc0) at pulse/mainloop.c:655
#6  0x00007f21e409b108 in pa_mainloop_dispatch (m=m@entry=0x557c8734cbc0) at pulse/mainloop.c:898
#7  0x00007f21e409b4de in pa_mainloop_iterate (m=0x557c8734cbc0, block=<optimized out>, retval=0x0) at pulse/mainloop.c:929
#8  0x00007f21e409b560 in pa_mainloop_run (m=0x557c8734cbc0, retval=retval@entry=0x0) at pulse/mainloop.c:944
#9  0x00007f21e40a93c9 in thread (userdata=0x557c8734cb80) at pulse/thread-mainloop.c:100
#10 0x00007f21cc5cd318 in internal_thread_func (userdata=0x557c873576c0) at pulsecore/thread-posix.c:81
#11 0x00007f221977e6db in start_thread (arg=0x7f21b1964700) at pthread_create.c:463
#12 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f21b27fc700 (LWP 2630)):
#0  0x00007f2219784ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f21b27fb700, expected=0, futex_word=0x7f21b27fb8e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f2219784ed9 in __pthread_cond_wait_common (abstime=0x7f21b27fb7a0, mutex=0x7f21b27fb898, cond=0x7f21b27fb8c0) at pthread_cond_wait.c:533
#2  0x00007f2219784ed9 in __pthread_cond_timedwait (cond=0x7f21b27fb8c0, mutex=0x7f21b27fb898, abstime=0x7f21b27fb7a0) at pthread_cond_wait.c:667
#3  0x00007f220ef60b17 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220ef6146a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220eedfa80 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef33311 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f221977e6db in start_thread (arg=0x7f21b27fc700) at pthread_create.c:463
#10 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f21b2ffd700 (LWP 2629)):
#0  0x00007f22197849f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x557c8738dbb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f22197849f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x557c8738daf8, cond=0x557c8738db90) at pthread_cond_wait.c:502
#2  0x00007f22197849f3 in __pthread_cond_wait (cond=0x557c8738db90, mutex=0x557c8738daf8) at pthread_cond_wait.c:655
#3  0x00007f220ef60a49 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220f819178 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220ef347df in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f221977e6db in start_thread (arg=0x7f21b2ffd700) at pthread_create.c:463
#8  0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f21b37fe700 (LWP 2628)):
#0  0x00007f221de9c6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f221de9e474 in ___fprintf_chk (fp=0x7f221e1598b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f220659b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f22065839ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f2206583b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f220658546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f220657b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f220ef66ccd in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef33311 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f21b37fe700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f21b3fff700 (LWP 2627)):
#0  0x00007f22197849f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f21b3ffd748) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f22197849f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x557c86dac048, cond=0x7f21b3ffd720) at pthread_cond_wait.c:502
#2  0x00007f22197849f3 in __pthread_cond_wait (cond=0x7f21b3ffd720, mutex=0x557c86dac048) at pthread_cond_wait.c:655
#3  0x00007f2219dad952 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007f2219daf06f in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#5  0x00007f2219daf1ef in xcb_wait_for_reply64 () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#6  0x00007f221b1706e8 in _XReply () at /usr/lib/x86_64-linux-gnu/libX11.so.6
#7  0x00007f21ea7c5a1a in  () at /usr/lib/x86_64-linux-gnu/libGLX_nvidia.so.0
#8  0x00007f21ea78c6a5 in  () at /usr/lib/x86_64-linux-gnu/libGLX_nvidia.so.0
#9  0x00007f21e96ee160 in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#10 0x00007f21e9755a8b in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#11 0x00007f21e976284d in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#12 0x00007f21e96a5f40 in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#13 0x00007f21e92d8dc3 in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#14 0x00007f21e935999a in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#15 0x00007f21e9715366 in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#16 0x00007f21e92ce74d in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#17 0x00007f21e92d259c in  () at /usr/lib/x86_64-linux-gnu/libnvidia-glcore.so.418.56
#18 0x00007f220f8dd7b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#19 0x00007f220f8e2c52 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#20 0x00007f220f5ca84e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#21 0x00007f220f8d8d92 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#22 0x00007f22116b0ec7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#23 0x00007f22116b1723 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#24 0x00007f22116bc911 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#25 0x00007f22116b879f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#26 0x00007f22116b8961 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#27 0x00007f22116b8cbb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#28 0x00007f22116b92d5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#29 0x00007f220eec1283 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#30 0x00007f220eee49a2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#31 0x00007f220eee542f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#32 0x00007f220eee55b8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#33 0x00007f220eedfa21 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#34 0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#35 0x00007f220ef33311 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#36 0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#37 0x00007f221977e6db in start_thread (arg=0x7f21b3fff700) at pthread_create.c:463
#38 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f21ccff9700 (LWP 2626)):
#0  0x00007f22197849f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f21ccff8908) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f22197849f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f21ccff88b8, cond=0x7f21ccff88e0) at pthread_cond_wait.c:502
#2  0x00007f22197849f3 in __pthread_cond_wait (cond=0x7f21ccff88e0, mutex=0x7f21ccff88b8) at pthread_cond_wait.c:655
#3  0x00007f220ef60a49 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220ef61478 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220ef6150f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef21fc8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef247f6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef24af4 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f21ccff9700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f21cd7fa700 (LWP 2625)):
#0  0x00007f221de9c6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f221de9e474 in ___fprintf_chk (fp=0x7f221e1598b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f220659b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f22065839ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f2206583b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f220658546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f220657b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f220ef66c79 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220e8c8514 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef33468 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f221977e6db in start_thread (arg=0x7f21cd7fa700) at pthread_create.c:463
#12 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f21cf7fe700 (LWP 2621)):
#0  0x00007f2219784ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7f21cf7fd710, expected=0, futex_word=0x7f21cf7fd8f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007f2219784ed9 in __pthread_cond_wait_common (abstime=0x7f21cf7fd7b0, mutex=0x7f21cf7fd8a8, cond=0x7f21cf7fd8d0) at pthread_cond_wait.c:533
#2  0x00007f2219784ed9 in __pthread_cond_timedwait (cond=0x7f21cf7fd8d0, mutex=0x7f21cf7fd8a8, abstime=0x7f21cf7fd7b0) at pthread_cond_wait.c:667
#3  0x00007f220ef60b17 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f220ef6146a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f220ef61552 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f220ef21fb1 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef247f6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef24ab4 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f221977e6db in start_thread (arg=0x7f21cf7fe700) at pthread_create.c:463
#11 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f21cffff700 (LWP 2620)):
#0  0x00007f221de9c6ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007f221de9e474 in ___fprintf_chk (fp=0x7f221e1598b0 <_IO_stdfile_2_lock>, flag=1, format=0x7f220659b6a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007f22065839ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f2206583b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007f220658546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007f220657b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007f220ef66db4 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220ef28544 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ef33468 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f221977e6db in start_thread (arg=0x7f21cffff700) at pthread_create.c:463
#12 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f21e539c700 (LWP 2618)):
#0  0x00007f221de7c187 in __GI___libc_write (fd=2, buf=0x7f21e5398c40, nbytes=47) at ../sysdeps/unix/sysv/linux/write.c:27
#1  0x00007f221ddf71bd in _IO_new_file_write (f=0x7f221e158680 <_IO_2_1_stderr_>, data=0x7f21e5398c40, n=47) at fileops.c:1203
#2  0x00007f221ddf7b2f in new_do_write (to_do=<optimized out>, data=0x7f21e5398c40 "[warn] epoll_wait: Ung\303\274ltiger Dateideskriptor\n", fp=0x7f221e158680 <_IO_2_1_stderr_>) at fileops.c:457
#3  0x00007f221ddf7b2f in _IO_new_file_xsputn (f=0x7f221e158680 <_IO_2_1_stderr_>, data=<optimized out>, n=47) at fileops.c:1277
#4  0x00007f221ddca707 in buffered_vfprintf (s=s@entry=0x7f221e158680 <_IO_2_1_stderr_>, format=format@entry=0x7f220659b6a8 "[%s] %s\n", args=args@entry=0x7f21e539b200) at vfprintf.c:2350
#5  0x00007f221ddc7726 in _IO_vfprintf_internal (s=s@entry=0x7f221e158680 <_IO_2_1_stderr_>, format=0x7f220659b6a8 "[%s] %s\n", ap=ap@entry=0x7f21e539b200) at vfprintf.c:1301
#6  0x00007f221de9e4c6 in ___fprintf_chk (fp=0x7f221e158680 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#7  0x00007f22065839ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#8  0x00007f2206583b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#9  0x00007f220658546c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#10 0x00007f220657b114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#11 0x00007f220ef66ccd in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f220ef012db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f220ef33311 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007f220ef63561 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007f221977e6db in start_thread (arg=0x7f21e539c700) at pthread_create.c:463
#16 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f21e7f29700 (LWP 2611)):
#0  0x00007f22178f8394 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f22178b1a18 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f22178b23fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f221e9dbdcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f21e0000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f21e7f289b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#6  0x00007f221e7a44ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#7  0x00007f221d0c7015 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x7f221d33ed80) at thread/qthread_unix.cpp:361
#9  0x00007f221977e6db in start_thread (arg=0x7f21e7f29700) at pthread_create.c:463
#10 0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f21f1da5700 (LWP 2610)):
#0  0x00007f221de80bf9 in __GI___poll (fds=0x7f21f1da48e8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2219dad747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f2219daf36a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f21f3ef4578 in QXcbEventQueue::run() (this=0x557c86db9f60) at qxcbeventqueue.cpp:228
#4  0x00007f221e7a5c72 in QThreadPrivate::start(void*) (arg=0x557c86db9f60) at thread/qthread_unix.cpp:361
#5  0x00007f221977e6db in start_thread (arg=0x7f21f1da5700) at pthread_create.c:463
#6  0x00007f221de8d88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f222156fbc0 (LWP 2609)):
[KCrash Handler]
#6  0x00007f220d3a973f in QtWebEngineCore::ProfileAdapter::httpUserAgent() const () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f220d3d3508 in QtWebEngineCore::WebContentsAdapter::initialize(content::SiteInstance*) () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f220d3dbca0 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f220ed15d64 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f220ea4b994 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007f220ebf46cf in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007f220f50ed04 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007f220eec1283 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007f220eee49a2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007f220eee542f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007f220eee55b8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007f220d35e7f7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#18 0x00007f221e9af39b in QObject::event(QEvent*) (this=0x557c8731f1a8, e=<optimized out>) at kernel/qobject.cpp:1282
#19 0x00007f221f77a65c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x557c86d5ae80, receiver=receiver@entry=0x557c8731f1a8, e=e@entry=0x7f21b40e1850) at kernel/qapplication.cpp:3736
#20 0x00007f221f781b90 in QApplication::notify(QObject*, QEvent*) (this=0x7ffc07b0eaf0, receiver=0x557c8731f1a8, e=0x7f21b40e1850) at kernel/qapplication.cpp:3483
#21 0x00007f221e97ed18 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x557c8731f1a8, event=0x7f21b40e1850) at kernel/qcoreapplication.cpp:1060
#22 0x00007f221e97eeee in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=<optimized out>, event=event@entry=0x7f21b40e1850) at kernel/qcoreapplication.cpp:1450
#23 0x00007f221e9818d7 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x557c86d59490) at kernel/qcoreapplication.cpp:1799
#24 0x00007f221e981e78 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1653
#25 0x00007f221e9dc793 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x557c86e03b10) at kernel/qeventdispatcher_glib.cpp:276
#26 0x00007f22178b2317 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f22178b2550 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f22178b25dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f221e9dbdaf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x557c86dffbb0, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#30 0x00007f221e97d03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffc07b0e9c0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#31 0x00007f221e986170 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1363
#32 0x0000557c851524c5 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:229

Reported using DrKonqi