Application: kmail (5.5.1)

Qt Version: 5.7.1
Frameworks Version: 5.36.0
Operating System: Linux 4.11.11-300.fc26.x86_64 x86_64
Distribution: "Fedora release 26 (Twenty Six)"

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

Hitting reply on a specific email from someone, usually the same person.
Sometimes KMail is slow opening the reply window it it's a long thread, but that's not it here. 

Nothing obviously specific about the email, no attachments, single email with no long thread behing it. 
Clicking "modify" email is OK.  Click reply / reply all / forward crashes KMail.

The crash can be reproduced every time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4964ab4940 (LWP 14126))]

Thread 27 (Thread 0x7f4845e1d700 (LWP 14211)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a64a725 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64ac07 in base::SequencedWorkerPool::Worker::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a64b9a1 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 26 (Thread 0x7f484661e700 (LWP 14210)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a64a725 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64ac07 in base::SequencedWorkerPool::Worker::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a64b9a1 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 25 (Thread 0x7f48cc8c5700 (LWP 14184)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f496a0b7534 in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5Script.so.5
#2  0x00007f496a0b7579 in  () at /lib64/libQt5Script.so.5
#3  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#4  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 24 (Thread 0x7f48ce335700 (LWP 14172)):
#0  0x00007f4972f144c4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x00007f4972ecf686 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#2  0x00007f4987d56e6b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f4987d0760a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f4987b5f99a in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f4987b63c9e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#6  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#7  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 23 (Thread 0x7f4904ff9700 (LWP 14156)):
#0  0x00007f4986f3b19d in read () at /lib64/libc.so.6
#1  0x00007f49662d80b1 in pa_read () at /usr/lib64/pulseaudio/libpulsecommon-10.0.so
#2  0x00007f49681e111e in pa_mainloop_prepare () at /lib64/libpulse.so.0
#3  0x00007f49681e1b90 in pa_mainloop_iterate () at /lib64/libpulse.so.0
#4  0x00007f49681e1c50 in pa_mainloop_run () at /lib64/libpulse.so.0
#5  0x00007f49681efab9 in thread () at /lib64/libpulse.so.0
#6  0x00007f4966307078 in internal_thread_func () at /usr/lib64/pulseaudio/libpulsecommon-10.0.so
#7  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#8  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 22 (Thread 0x7f49057fa700 (LWP 14155)):
#0  0x00007f4986f3b1fd in write () at /lib64/libc.so.6
#1  0x00007f4986eb91fd in _IO_new_file_write () at /lib64/libc.so.6
#2  0x00007f4986eb9b9f in __GI__IO_file_xsputn () at /lib64/libc.so.6
#3  0x00007f4986e8d717 in buffered_vfprintf () at /lib64/libc.so.6
#4  0x00007f4986e8a756 in vfprintf () at /lib64/libc.so.6
#5  0x00007f4986f5c2a6 in __fprintf_chk () at /lib64/libc.so.6
#6  0x00007f496d428880 in _warn_helper () at /lib64/libevent-2.0.so.5
#7  0x00007f496d428a44 in event_warn () at /lib64/libevent-2.0.so.5
#8  0x00007f496d42d1e0 in epoll_dispatch () at /lib64/libevent-2.0.so.5
#9  0x00007f496d417dbe in event_base_loop () at /lib64/libevent-2.0.so.5
#10 0x00007f497a61b559 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#12 0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#13 0x00007f497a64bf66 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#14 0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#15 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#16 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 21 (Thread 0x7f4905ffb700 (LWP 14154)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a640409 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a640437 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61af5b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f497a64bf66 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#9  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 20 (Thread 0x7f49067fc700 (LWP 14153)):
#0  0x00007f4982ea2d1a in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a679172 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64038e in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61afab in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f497a64bf66 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#9  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 19 (Thread 0x7f4906ffd700 (LWP 14152)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497adc8ea0 in cc::SingleThreadTaskGraphRunner::Run() () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64b9a1 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#5  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 18 (Thread 0x7f4907fff700 (LWP 14151)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a64a725 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64ac07 in base::SequencedWorkerPool::Worker::Run() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a64b9a1 in base::SimpleThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 17 (Thread 0x7f49077fe700 (LWP 14150)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a640409 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a640437 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61af5b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f497a64bf66 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#9  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 16 (Thread 0x7f4928ff9700 (LWP 14149)):
[KCrash Handler]
#6  0x00007f497aa80539 in std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<net::ChannelIDServiceJob, std::default_delete<net::ChannelIDServiceJob> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<net::ChannelIDServiceJob, std::default_delete<net::ChannelIDServiceJob> > > >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<net::ChannelIDServiceJob, std::default_delete<net::ChannelIDServiceJob> > > > >::find(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497aa80b60 in net::ChannelIDService::JoinToInFlightRequest(base::TimeTicks const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::unique_ptr<crypto::ECPrivateKey, std::default_delete<crypto::ECPrivateKey> >*, bool, base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, net::ChannelIDService::Request*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497aa81588 in net::ChannelIDService::GetOrCreateChannelID(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::unique_ptr<crypto::ECPrivateKey, std::default_delete<crypto::ECPrivateKey> >*, base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, net::ChannelIDService::Request*) () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f497abbc475 in net::SSLClientSocketImpl::DoChannelIDLookup() () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f497abc0058 in net::SSLClientSocketImpl::DoHandshakeLoop(int) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f497abc024e in net::SSLClientSocketImpl::OnHandshakeIOComplete(int) () at /lib64/libQt5WebEngineCore.so.5
#12 0x00007f497abc03bf in net::SSLClientSocketImpl::RetryAllOperations() () at /lib64/libQt5WebEngineCore.so.5
#13 0x00007f497ab631c3 in net::TCPClientSocket::DidCompleteReadWrite(base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, int) () at /lib64/libQt5WebEngineCore.so.5
#14 0x00007f497ab653d3 in net::TCPSocketPosix::ReadCompleted(scoped_refptr<net::IOBuffer> const&, base::Callback<void (int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, int) () at /lib64/libQt5WebEngineCore.so.5
#15 0x00007f497ac3d1f6 in net::SocketPosix::ReadCompleted() () at /lib64/libQt5WebEngineCore.so.5
#16 0x00007f497ac3db2d in net::SocketPosix::OnFileCanReadWithoutBlocking(int) () at /lib64/libQt5WebEngineCore.so.5
#17 0x00007f497a61b7af in base::MessagePumpLibevent::OnLibeventNotification(int, short, void*) () at /lib64/libQt5WebEngineCore.so.5
#18 0x00007f496d4183f9 in event_base_loop () at /lib64/libevent-2.0.so.5
#19 0x00007f497a61b693 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#20 0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#21 0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#22 0x00007f4979f1ca78 in content::BrowserThreadImpl::IOThreadRun(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#23 0x00007f4979f1d02b in content::BrowserThreadImpl::Run(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#24 0x00007f497a64c018 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#25 0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#26 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#27 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 15 (Thread 0x7f49297fa700 (LWP 14148)):
#0  0x00007f4982ea2d1a in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a679172 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64038e in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61afab in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f4979f1c9c8 in content::BrowserThreadImpl::CacheThreadRun(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f4979f1d01b in content::BrowserThreadImpl::Run(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497a64c018 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 14 (Thread 0x7f4929ffb700 (LWP 14147)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a640409 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a640437 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61af5b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f4979f1c918 in content::BrowserThreadImpl::ProcessLauncherThreadRun(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f4979f1d00b in content::BrowserThreadImpl::Run(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497a64c018 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 13 (Thread 0x7f492a7fc700 (LWP 14146)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a640409 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a640437 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61af5b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f4979f1c868 in content::BrowserThreadImpl::FileUserBlockingThreadRun(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f4979f1cffb in content::BrowserThreadImpl::Run(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497a64c018 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 12 (Thread 0x7f492affd700 (LWP 14145)):
#0  0x00007f4986f5a48c in __lll_lock_wait_private () at /lib64/libc.so.6
#1  0x00007f4986f5c254 in __fprintf_chk () at /lib64/libc.so.6
#2  0x00007f496d428880 in _warn_helper () at /lib64/libevent-2.0.so.5
#3  0x00007f496d428a44 in event_warn () at /lib64/libevent-2.0.so.5
#4  0x00007f496d42d1e0 in epoll_dispatch () at /lib64/libevent-2.0.so.5
#5  0x00007f496d417dbe in event_base_loop () at /lib64/libevent-2.0.so.5
#6  0x00007f497a61b5ad in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f4979f1c7b8 in content::BrowserThreadImpl::FileThreadRun(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f4979f1cfeb in content::BrowserThreadImpl::Run(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f497a64c018 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#12 0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#13 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#14 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 11 (Thread 0x7f492b7fe700 (LWP 14144)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a640409 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a640437 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61af5b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f4979f1c708 in content::BrowserThreadImpl::DBThreadRun(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f4979f1cfdb in content::BrowserThreadImpl::Run(base::RunLoop*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497a64c018 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 10 (Thread 0x7f492bfff700 (LWP 14143)):
#0  0x00007f4982ea2d1a in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a679172 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64f229 in base::PosixDynamicThreadPool::WaitForTask() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a64f78b in base::(anonymous namespace)::WorkerThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7f493ce03700 (LWP 14142)):
#0  0x00007f4982ea2d1a in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a679172 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a64f229 in base::PosixDynamicThreadPool::WaitForTask() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a64f78b in base::(anonymous namespace)::WorkerThread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f493d604700 (LWP 14141)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f497a640409 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /lib64/libQt5WebEngineCore.so.5
#2  0x00007f497a640437 in base::WaitableEvent::Wait() () at /lib64/libQt5WebEngineCore.so.5
#3  0x00007f497a61af5b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#4  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#5  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#6  0x00007f497a64bf66 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#9  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f493de05700 (LWP 14140)):
#0  0x00007f4986f5a48c in __lll_lock_wait_private () at /lib64/libc.so.6
#1  0x00007f4986f5c254 in __fprintf_chk () at /lib64/libc.so.6
#2  0x00007f496d428880 in _warn_helper () at /lib64/libevent-2.0.so.5
#3  0x00007f496d428a44 in event_warn () at /lib64/libevent-2.0.so.5
#4  0x00007f496d42d1e0 in epoll_dispatch () at /lib64/libevent-2.0.so.5
#5  0x00007f496d417dbe in event_base_loop () at /lib64/libevent-2.0.so.5
#6  0x00007f497a61b559 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /lib64/libQt5WebEngineCore.so.5
#7  0x00007f497a617828 in base::MessageLoop::RunHandler() () at /lib64/libQt5WebEngineCore.so.5
#8  0x00007f497a63426b in base::RunLoop::Run() () at /lib64/libQt5WebEngineCore.so.5
#9  0x00007f497a64bf66 in base::Thread::ThreadMain() () at /lib64/libQt5WebEngineCore.so.5
#10 0x00007f497a64806b in base::(anonymous namespace)::ThreadFunc(void*) () at /lib64/libQt5WebEngineCore.so.5
#11 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#12 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f494b7fe700 (LWP 14131)):
#0  0x00007f4986f3b19d in read () at /lib64/libc.so.6
#1  0x00007f4972f13170 in g_wakeup_acknowledge () at /lib64/libglib-2.0.so.0
#2  0x00007f4972ecf078 in g_main_context_check () at /lib64/libglib-2.0.so.0
#3  0x00007f4972ecf510 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#4  0x00007f4972ecf67c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#5  0x00007f4987d56e6b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#6  0x00007f4987d0760a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#7  0x00007f4987b5f99a in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00007f4987b63c9e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#9  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#10 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f494bfff700 (LWP 14130)):
#0  0x00007f4972f144a9 in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x00007f4972ecf52e in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f4972ecf67c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f4987d56e6b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f4987d0760a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f4987b5f99a in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f4987b63c9e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#8  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f4950d51700 (LWP 14129)):
#0  0x00007f4987d5553d in QTimerInfoList::updateCurrentTime() () at /lib64/libQt5Core.so.5
#1  0x00007f4987d55935 in QTimerInfoList::timerWait(timespec&) () at /lib64/libQt5Core.so.5
#2  0x00007f4987d56b0c in timerSourcePrepareHelper(GTimerSource*, int*) () at /lib64/libQt5Core.so.5
#3  0x00007f4987d56bae in timerSourcePrepare(_GSource*, int*) () at /lib64/libQt5Core.so.5
#4  0x00007f4972eceac9 in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#5  0x00007f4972ecf49b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#6  0x00007f4972ecf67c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#7  0x00007f4987d56e6b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#8  0x00007f4987d0760a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#9  0x00007f4987b5f99a in QThread::exec() () at /lib64/libQt5Core.so.5
#10 0x00007f4987b63c9e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#11 0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#12 0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f4951f62700 (LWP 14128)):
#0  0x00007f4986f3fa9d in poll () at /lib64/libc.so.6
#1  0x00007f4972ecf569 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f4972ecf67c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f4987d56e6b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f4987d0760a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f4987b5f99a in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f498904fa39 in QDBusConnectionManager::run() () at /lib64/libQt5DBus.so.5
#7  0x00007f4987b63c9e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#9  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f495af47700 (LWP 14127)):
#0  0x00007f4986f3fa9d in poll () at /lib64/libc.so.6
#1  0x00007f49725c3c97 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f49725c5a8a in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007f495ded5ba9 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007f4987b63c9e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007f4982e9c36d in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4986f4bb8f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f4964ab4940 (LWP 14126)):
#0  0x00007f4982ea281b in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f49725c3d12 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f49725c5b7a in xcb_wait_for_special_event () at /lib64/libxcb.so.1
#3  0x00007f4959bed9a7 in dri3_find_back () at /lib64/libGLX_mesa.so.0
#4  0x00007f4959bee7bc in loader_dri3_get_buffers () at /lib64/libGLX_mesa.so.0
#5  0x00007f49587d9a7d in intel_update_renderbuffers () at /usr/lib64/dri/i965_dri.so
#6  0x00007f49587d9d71 in intel_prepare_render () at /usr/lib64/dri/i965_dri.so
#7  0x00007f49587cd1f5 in brw_clear () at /usr/lib64/dri/i965_dri.so
#8  0x00007f49882830cb in QPlatformBackingStore::composeAndFlush(QWindow*, QRegion const&, QPoint const&, QPlatformTextureList*, QOpenGLContext*, bool) () at /lib64/libQt5Gui.so.5
#9  0x00007f495def53b7 in QXcbBackingStore::composeAndFlush(QWindow*, QRegion const&, QPoint const&, QPlatformTextureList*, QOpenGLContext*, bool) () at /lib64/libQt5XcbQpa.so.5
#10 0x00007f4988560049 in QWidgetBackingStore::qt_flush(QWidget*, QRegion const&, QBackingStore*, QWidget*, QPoint const&, QPlatformTextureList*, QWidgetBackingStore*) () at /lib64/libQt5Widgets.so.5
#11 0x00007f498856176e in QWidgetBackingStore::flush(QWidget*) () at /lib64/libQt5Widgets.so.5
#12 0x00007f4988562e18 in QWidgetBackingStore::doSync() () at /lib64/libQt5Widgets.so.5
#13 0x00007f498856302d in QWidgetBackingStore::sync() () at /lib64/libQt5Widgets.so.5
#14 0x00007f49885821af in QWidgetPrivate::syncBackingStore() () at /lib64/libQt5Widgets.so.5
#15 0x00007f4988599ef8 in QWidget::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#16 0x00007f4988693f2b in QMainWindow::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#17 0x00007f498b0e2a57 in KMainWindow::event(QEvent*) () at /lib64/libKF5XmlGui.so.5
#18 0x00007f498b127a65 in KXmlGuiWindow::event(QEvent*) () at /lib64/libKF5XmlGui.so.5
#19 0x00007f49885535dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#20 0x00007f498855ac74 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#21 0x00007f4987d08627 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#22 0x00007f4987d0a85b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#23 0x00007f4987d56dd3 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQt5Core.so.5
#24 0x00007f4972ecf247 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#25 0x00007f4972ecf5e8 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#26 0x00007f4972ecf67c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#27 0x00007f4987d56e4f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#28 0x00007f4987d0760a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#29 0x00007f4987d0f27c in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#30 0x00005596695ed7dd in main ()

Reported using DrKonqi