Application: kontact (5.4.3)

Qt Version: 5.7.1
Frameworks Version: 5.33.0
Operating System: Linux 4.10.13-200.fc25.x86_64 x86_64
Distribution: "Fedora release 25 (Twenty Five)"

-- Information about the crash:
- What I was doing when the application crashed:
 I just tried to start the application. If it happens once it usualy happens multiple times up to "it seams like forever". After a while 5 starts or even a few weeks with 100reds of tries it usually continues working without any noticable change.

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2b4d068940 (LWP 14721))]

Thread 30 (Thread 0x7f2a40e7b700 (LWP 14789)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2a58676f93 in JSC::GCThread::waitForNextPhase() () at /lib64/libQt5WebKit.so.5
#2  0x00007f2a58677020 in JSC::GCThread::gcThreadMain() () at /lib64/libQt5WebKit.so.5
#3  0x00007f2a5897d451 in WTF::wtfThreadEntryPoint(void*) () at /lib64/libQt5WebKit.so.5
#4  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#5  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 29 (Thread 0x7f2a4167c700 (LWP 14788)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2a5867614c in JSC::BlockAllocator::blockFreeingThreadMain() () at /lib64/libQt5WebKit.so.5
#2  0x00007f2a5897d451 in WTF::wtfThreadEntryPoint(void*) () at /lib64/libQt5WebKit.so.5
#3  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#4  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 28 (Thread 0x7f2a41f7f700 (LWP 14787)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2a58955c16 in WTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5WebKit.so.5
#2  0x00007f2a58955c39 in  () at /lib64/libQt5WebKit.so.5
#3  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#4  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 27 (Thread 0x7f2a44111700 (LWP 14785)):
#0  0x00007f2b5743e894 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x00007f2b573f8690 in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#2  0x00007f2b573f908b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#3  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#4  0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#6  0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#9  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 26 (Thread 0x7f2a449b8700 (LWP 14773)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcc1e89 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcc24d9 in base::SequencedWorkerPool::Worker::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fcc2690 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 25 (Thread 0x7f2a451b9700 (LWP 14772)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcc1e89 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcc24d9 in base::SequencedWorkerPool::Worker::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fcc2690 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 24 (Thread 0x7f2a47c4d700 (LWP 14764)):
#0  0x00007ffe15117b12 in clock_gettime ()
#1  0x00007f2b64b21726 in clock_gettime () at /lib64/libc.so.6
#2  0x00007f2b657b6b31 in qt_gettime() () at /lib64/libQt5Core.so.5
#3  0x00007f2b6590bd99 in QTimerInfoList::updateCurrentTime() () at /lib64/libQt5Core.so.5
#4  0x00007f2b6590c195 in QTimerInfoList::timerWait(timespec&) () at /lib64/libQt5Core.so.5
#5  0x00007f2b6590d38c in timerSourcePrepareHelper(GTimerSource*, int*) () at /lib64/libQt5Core.so.5
#6  0x00007f2b6590d455 in timerSourcePrepare(_GSource*, int*) () at /lib64/libQt5Core.so.5
#7  0x00007f2b573f869d in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#8  0x00007f2b573f908b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#9  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#10 0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#11 0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#12 0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#13 0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#14 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#15 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 23 (Thread 0x7f2a4844e700 (LWP 14763)):
#0  0x00007f2b573f867b in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#1  0x00007f2b573f908b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#8  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 22 (Thread 0x7f2a526f3700 (LWP 14753)):
#0  0x00007f2b5743e879 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x00007f2b573f86aa in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#2  0x00007f2b573f908b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#3  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#4  0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#6  0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#7  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#9  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 21 (Thread 0x7f2a52ef4700 (LWP 14752)):
#0  0x00007f2b64b02bed in read () at /lib64/libc.so.6
#1  0x00007f2b5743d4d0 in g_wakeup_acknowledge () at /lib64/libglib-2.0.so.0
#2  0x00007f2b573f8c83 in g_main_context_check () at /lib64/libglib-2.0.so.0
#3  0x00007f2b573f9104 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#4  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#5  0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#6  0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#7  0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#9  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#10 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 20 (Thread 0x7f2a53735700 (LWP 14751)):
#0  0x00007f2b64b0701d in poll () at /lib64/libc.so.6
#1  0x00007f2b573f9166 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#8  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 19 (Thread 0x7f2ae1ffb700 (LWP 14749)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b4ef422f4 in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5Script.so.5
#2  0x00007f2b4ef42339 in  () at /lib64/libQt5Script.so.5
#3  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#4  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 18 (Thread 0x7f2ae27fc700 (LWP 14747)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcc1e89 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcc24d9 in base::SequencedWorkerPool::Worker::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fcc2690 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 17 (Thread 0x7f2af37fe700 (LWP 14744)):
#0  0x00007f2b64b02bed in read () at /lib64/libc.so.6
#1  0x00007f2b3b94d101 in pa_read () at /usr/lib64/pulseaudio/libpulsecommon-10.0.so
#2  0x00007f2b3bdd30be in pa_mainloop_prepare () at /lib64/libpulse.so.0
#3  0x00007f2b3bdd3b30 in pa_mainloop_iterate () at /lib64/libpulse.so.0
#4  0x00007f2b3bdd3bf0 in pa_mainloop_run () at /lib64/libpulse.so.0
#5  0x00007f2b3bde1bd9 in thread () at /lib64/libpulse.so.0
#6  0x00007f2b3b97c1d8 in internal_thread_func () at /usr/lib64/pulseaudio/libpulsecommon-10.0.so
#7  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#8  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 16 (Thread 0x7f2b10ff9700 (LWP 14743)):
#0  0x00007f2b5be9a809 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8422 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8cc5 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a631 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#9  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 15 (Thread 0x7f2b117fa700 (LWP 14742)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b61b1b6cd in cc::SingleThreadTaskGraphRunner::Run() () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcc256e in base::DelegateSimpleThread::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fcc2690 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 14 (Thread 0x7f2b11ffb700 (LWP 14741)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8c35 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8ce4 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a5f3 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#9  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 13 (Thread 0x7f2b127fc700 (LWP 14740)):
#0  0x00007f2b64b20f5c in __lll_lock_wait_private () at /lib64/libc.so.6
#1  0x00007f2b64b22b64 in __fprintf_chk () at /lib64/libc.so.6
#2  0x00007f2b557bf86e in _warn_helper () at /lib64/libevent-2.0.so.5
#3  0x00007f2b557bfa64 in event_warn () at /lib64/libevent-2.0.so.5
#4  0x00007f2b557c41e8 in epoll_dispatch () at /lib64/libevent-2.0.so.5
#5  0x00007f2b557ae18a in event_base_loop () at /lib64/libevent-2.0.so.5
#6  0x00007f2b5fc76245 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b60252288 in content::BrowserThreadImpl::IOThreadRun(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b60252bac in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#12 0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#13 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#14 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 12 (Thread 0x7f2b12ffd700 (LWP 14739)):
#0  0x00007f2b5be9a809 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8422 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8cc5 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a631 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b602521d8 in content::BrowserThreadImpl::CacheThreadRun(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b60252b94 in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#11 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 11 (Thread 0x7f2b137fe700 (LWP 14738)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8c35 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8ce4 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a5f3 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b60252128 in content::BrowserThreadImpl::ProcessLauncherThreadRun(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b60252b7c in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#11 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 10 (Thread 0x7f2b13fff700 (LWP 14737)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8c35 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8ce4 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a5f3 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b60252078 in content::BrowserThreadImpl::FileUserBlockingThreadRun(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b60252b6c in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#11 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7f2b2cff9700 (LWP 14736)):
#0  0x00007f2b64b0e828 in tfind () at /lib64/libc.so.6
#1  0x00007f2b64a3ae94 in __dcigettext () at /lib64/libc.so.6
#2  0x00007f2b64a97e8c in strerror_r () at /lib64/libc.so.6
#3  0x00007f2b64a97dbf in strerror () at /lib64/libc.so.6
#4  0x00007f2b557bfa51 in event_warn () at /lib64/libevent-2.0.so.5
#5  0x00007f2b557c41e8 in epoll_dispatch () at /lib64/libevent-2.0.so.5
#6  0x00007f2b557ae18a in event_base_loop () at /lib64/libevent-2.0.so.5
#7  0x00007f2b5fc760fe in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b60251fc8 in content::BrowserThreadImpl::FileThreadRun(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f2b60252b5c in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#12 0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#13 0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#14 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#15 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f2b2d7fa700 (LWP 14735)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8c35 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8ce4 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a5f3 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b60251f18 in content::BrowserThreadImpl::DBThreadRun(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b60252b4c in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#11 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f2b2dffb700 (LWP 14734)):
#0  0x00007f2b5be9a809 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8422 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcc5949 in base::PosixDynamicThreadPool::WaitForTask() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fcc5e83 in base::(anonymous namespace)::WorkerThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f2b2e7fc700 (LWP 14733)):
#0  0x00007f2b5be9a809 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8422 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcc5949 in base::PosixDynamicThreadPool::WaitForTask() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fcc5e83 in base::(anonymous namespace)::WorkerThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f2b2effd700 (LWP 14732)):
#0  0x00007f2b5be9a460 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f2b5fcb8c35 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f2b5fcb8ce4 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f2b5fc9a5f3 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#9  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f2b2f7fe700 (LWP 14731)):
#0  0x00007f2b64a58bf8 in vfprintf () at /lib64/libc.so.6
#1  0x00007f2b64b22bb9 in __fprintf_chk () at /lib64/libc.so.6
#2  0x00007f2b557bf86e in _warn_helper () at /lib64/libevent-2.0.so.5
#3  0x00007f2b557bfa64 in event_warn () at /lib64/libevent-2.0.so.5
#4  0x00007f2b557c41e8 in epoll_dispatch () at /lib64/libevent-2.0.so.5
#5  0x00007f2b557ae18a in event_base_loop () at /lib64/libevent-2.0.so.5
#6  0x00007f2b5fc760fe in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f2b5fcace8a in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f2b5fcc29a5 in base::Thread::Run(base::MessageLoop*) () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f2b5fcc2c64 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f2b5fcbf3d2 in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#12 0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f2b368b9700 (LWP 14724)):
#0  0x00007f2b64b0701d in poll () at /lib64/libc.so.6
#1  0x00007f2b573f9166 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f2b6590d6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f2b6571b5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f2b6a734739 in QDBusConnectionManager::run() () at /lib64/libQt5DBus.so.5
#7  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#9  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f2b42486700 (LWP 14723)):
#0  0x00007f2b64b0701d in poll () at /lib64/libc.so.6
#1  0x00007f2b5a900d10 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f2b5a902aa9 in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007f2b464a4d69 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007f2b6571f9ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007f2b5be946ca in start_thread () at /lib64/libpthread.so.0
#6  0x00007f2b64b12f7f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f2b4d068940 (LWP 14721)):
[KCrash Handler]
#6  0x00007f2b64b5d475 in __memcpy_ssse3 () at /lib64/libc.so.6
#7  0x00007f2b65799d8a in QString::append(QString const&) () at /lib64/libQt5Core.so.5
#8  0x00007f2a53e0f947 in KSieveUi::VacationCheckJob::getNextScript() () at /lib64/libKF5KSieveUi.so.5
#9  0x00007f2a53e0f9ea in KSieveUi::VacationCheckJob::getNextScript() () at /lib64/libKF5KSieveUi.so.5
#10 0x00007f2a53e0fd8c in KSieveUi::VacationCheckJob::slotGetResult(KManageSieve::SieveJob*, bool, QString const&, bool) () at /lib64/libKF5KSieveUi.so.5
#11 0x00007f2b658e6a56 in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#12 0x00007f2a53955cfb in KManageSieve::SieveJob::gotScript(KManageSieve::SieveJob*, bool, QString const&, bool) () at /lib64/libKF5KManageSieve.so.5
#13 0x00007f2a53954886 in KManageSieve::SieveJob::Private::handleResponse(KManageSieve::Response const&, QByteArray const&) () at /lib64/libKF5KManageSieve.so.5
#14 0x00007f2a5394c174 in KManageSieve::Session::processResponse(KManageSieve::Response const&, QByteArray const&) () at /lib64/libKF5KManageSieve.so.5
#15 0x00007f2b658e77e9 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#16 0x00007f2b660ffecc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#17 0x00007f2b66107671 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#18 0x00007f2b658bf6fa in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#19 0x00007f2b658c1de0 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#20 0x00007f2b6590d653 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQt5Core.so.5
#21 0x00007f2b573f8e52 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#22 0x00007f2b573f91d0 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#23 0x00007f2b573f927c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#24 0x00007f2b6590d6cf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#25 0x00007f2b658be68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#26 0x00007f2b658c618c in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#27 0x00005611f02b84f7 in main ()

Reported using DrKonqi