Kontact crashed after opening a contact

Application: kontact (5.4.1)
– Information about the crash:

• What I was doing when the application crashed:
  1. open kontact
  2. switch to kaddressbook
  3. open a contact in order to modify
  4. see Kontact crashing

The crash can be reproduced sometimes.

See: https://bugs.kde.org/show_bug.cgi?id=375577

– Backtrace:
Application: Kontact (kontact), signal: Illegal instruction
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4dc1338440 (LWP 2658))]

Thread 36 (Thread 0x7f4c123bc700 (LWP 7717)):
#0 0x00007f4db7a37e74 in g_mutex_unlock () at /usr/lib64/libglib-2.0.so.0
#1 0x00007f4db79f287a in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4d60001d10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c123bbc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#6 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x77c7240) at thread/qthread_unix.cpp:368
#7 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#8 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 35 (Thread 0x7f4c210d1700 (LWP 7338)):
#0 0x00007f4db79f1c21 in g_main_context_prepare () at /usr/lib64/libglib-2.0.so.0
#1 0x00007f4db79f27ab in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4d44001980, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c210d0c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#6 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x6b45dd0) at thread/qthread_unix.cpp:368
#7 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#8 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 34 (Thread 0x7f4c135fe700 (LWP 7302)):
#0 0x00007f4db9c094b8 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d96b22 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0da5980 in base::PosixDynamicThreadPool::WaitForTask() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0da5eb3 in base::(anonymous namespace)::WorkerThread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 33 (Thread 0x7f4d8d982700 (LWP 7301)):
#0 0x00007f4db9c094b8 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d96b22 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0da5980 in base::PosixDynamicThreadPool::WaitForTask() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0da5eb3 in base::(anonymous namespace)::WorkerThread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 32 (Thread 0x7f4c12bbd700 (LWP 5493)):
#0 0x00007f4dbdcb7690 in getenv () at /lib64/libc.so.6
#1 0x00007f4dbdcb0044 in __dcigettext () at /lib64/libc.so.6
#2 0x00007f4dbdd027ec in strerror_r () at /lib64/libc.so.6
#3 0x00007f4dbdd0271f in strerror () at /lib64/libc.so.6
#4 0x00007f4da9066751 in event_warn () at /usr/lib64/libevent-2.0.so.5
#5 0x00007f4da906aee8 in () at /usr/lib64/libevent-2.0.so.5
#6 0x00007f4da9054e8a in event_base_loop () at /usr/lib64/libevent-2.0.so.5
#7 0x00007f4db0d4fece in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#12 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#13 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 31 (Thread 0x7f4c23ffd700 (LWP 2822)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4c9636e873 in () at /usr/lib64/libQt5WebKit.so.5
#2 0x00007f4c966a4c61 in () at /usr/lib64/libQt5WebKit.so.5
#3 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#4 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 30 (Thread 0x7f4c689b2700 (LWP 2821)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4c9636e873 in () at /usr/lib64/libQt5WebKit.so.5
#2 0x00007f4c966a4c61 in () at /usr/lib64/libQt5WebKit.so.5
#3 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#4 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 29 (Thread 0x7f4c691b3700 (LWP 2820)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4c9636e873 in () at /usr/lib64/libQt5WebKit.so.5
#2 0x00007f4c966a4c61 in () at /usr/lib64/libQt5WebKit.so.5
#3 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#4 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 28 (Thread 0x7f4c699b4700 (LWP 2819)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4c9636d721 in () at /usr/lib64/libQt5WebKit.so.5
#2 0x00007f4c966a4c61 in () at /usr/lib64/libQt5WebKit.so.5
#3 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#4 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 27 (Thread 0x7f4c6a7d3700 (LWP 2818)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4c96673f6b in () at /usr/lib64/libQt5WebKit.so.5
#2 0x00007f4c96673fa9 in () at /usr/lib64/libQt5WebKit.so.5
#3 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#4 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 26 (Thread 0x7f4c6b1e4700 (LWP 2787)):
#0 0x00007f4db79f287a in () at /usr/lib64/libglib-2.0.so.0
#1 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4c640008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#3 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c6b1e3c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#4 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#5 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x75cb9d0) at thread/qthread_unix.cpp:368
#6 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#7 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 25 (Thread 0x7f4c7db3e700 (LWP 2769)):
#0 0x00007f4dbdd6166d in poll () at /lib64/libc.so.6
#1 0x00007f4db79f2886 in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4c70000940, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c7db3dc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#6 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x4551d40) at thread/qthread_unix.cpp:368
#7 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#8 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 24 (Thread 0x7f4c90c99700 (LWP 2693)):
#0 0x00007f4db7a37e59 in g_mutex_lock () at /usr/lib64/libglib-2.0.so.0
#1 0x00007f4db79f2294 in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4db79f2824 in () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#4 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4c880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c90c98c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#7 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x2135c60) at thread/qthread_unix.cpp:368
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 23 (Thread 0x7f4c9149a700 (LWP 2692)):
#0 0x00007f4db7a37e74 in g_mutex_unlock () at /usr/lib64/libglib-2.0.so.0
#1 0x00007f4db79f1d60 in g_main_context_prepare () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4db79f27ab in () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#4 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4c840008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c91499c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#7 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x20e9290) at thread/qthread_unix.cpp:368
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 22 (Thread 0x7f4c9232a700 (LWP 2691)):
#0 0x00007f4dbe66b624 in QMutex::lock() (__m2=<optimized out>, __m1=std::memory_order_acquire, __p2=<optimized out>, __p1=@0x7f4c92329a48: 0x0, this=0x2596a60) at /usr/include/c++/6/bits/atomic_base.h:752
#1 0x00007f4dbe66b624 in QMutex::lock() (__m=std::memory_order_acquire, __p2=<optimized out>, __p1=@0x7f4c92329a48: 0x0, this=0x2596a60) at /usr/include/c++/6/atomic:475
#2 0x00007f4dbe66b624 in QMutex::lock() (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, _q_value=...) at ../../src/corelib/arch/qatomic_cxx11.h:290
#3 0x00007f4dbe66b624 in QMutex::lock() (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, this=0x2596a60) at ../../src/corelib/thread/qbasicatomic.h:259
#4 0x00007f4dbe66b624 in QMutex::lock() (current=<synthetic pointer>, this=0x2596a60) at thread/qmutex.h:89
#5 0x00007f4dbe66b624 in QMutex::lock() (this=this@entry=0x2596a60) at thread/qmutex.cpp:225
#6 0x00007f4dbe897a69 in postEventSourceCheck(GSource*) (m=0x2596a60, this=<synthetic pointer>) at ../../src/corelib/thread/qmutex.h:137
#7 0x00007f4dbe897a69 in postEventSourceCheck(GSource*) (this=0x2596a30) at ../../src/corelib/thread/qthread_p.h:253
#8 0x00007f4dbe897a69 in postEventSourceCheck(GSource*) (timeout=<synthetic pointer>, s=0x7f4c8c0012d0) at kernel/qeventdispatcher_glib.cpp:259
#9 0x00007f4dbe897a69 in postEventSourceCheck(GSource*) (source=0x7f4c8c0012d0) at kernel/qeventdispatcher_glib.cpp:269
#10 0x00007f4db79f2289 in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#11 0x00007f4db79f2824 in () at /usr/lib64/libglib-2.0.so.0
#12 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#13 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4c8c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#14 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4c92329c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#15 0x00007f4dbe66f813 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#16 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x2589a60) at thread/qthread_unix.cpp:368
#17 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#18 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 21 (Thread 0x7f4d23fff700 (LWP 2690)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4daac00974 in () at /usr/lib64/libQt5Script.so.5
#2 0x00007f4daac009b9 in () at /usr/lib64/libQt5Script.so.5
#3 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#4 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 20 (Thread 0x7f4d50ff9700 (LWP 2686)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0da20d9 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0da2719 in base::SequencedWorkerPool::Worker::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0da28d0 in base::SimpleThread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 19 (Thread 0x7f4d517fa700 (LWP 2684)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0da20d9 in base::SequencedWorkerPool::Inner::ThreadLoop(base::SequencedWorkerPool::Worker*) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0da2719 in base::SequencedWorkerPool::Worker::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0da28d0 in base::SimpleThread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 18 (Thread 0x7f4d51ffb700 (LWP 2683)):
#0 0x00007f4dbdd76bf2 in __libc_disable_asynccancel () at /lib64/libc.so.6
#1 0x00007f4dbdd61679 in poll () at /lib64/libc.so.6
#2 0x00007f4d9e303981 in () at /usr/lib64/libpulse.so.0
#3 0x00007f4d9e2f5191 in pa_mainloop_poll () at /usr/lib64/libpulse.so.0
#4 0x00007f4d9e2f582e in pa_mainloop_iterate () at /usr/lib64/libpulse.so.0
#5 0x00007f4d9e2f58e0 in pa_mainloop_run () at /usr/lib64/libpulse.so.0
#6 0x00007f4d9e3038c9 in () at /usr/lib64/libpulse.so.0
#7 0x00007f4d9dc93258 in () at /usr/lib64/pulseaudio/libpulsecommon-9.99.so
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 17 (Thread 0x7f4d527fc700 (LWP 2682)):
#0 0x00007f4dbdd76b3b in __lll_lock_wait_private () at /lib64/libc.so.6
#1 0x00007f4dbdd785f4 in __fprintf_chk () at /lib64/libc.so.6
#2 0x00007f4da906656e in () at /usr/lib64/libevent-2.0.so.5
#3 0x00007f4da9066764 in event_warn () at /usr/lib64/libevent-2.0.so.5
#4 0x00007f4da906aee8 in () at /usr/lib64/libevent-2.0.so.5
#5 0x00007f4da9054e8a in event_base_loop () at /usr/lib64/libevent-2.0.so.5
#6 0x00007f4db0d4fece in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#12 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 16 (Thread 0x7f4d52ffd700 (LWP 2681)):
#0 0x00007f4db9c094b8 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d96b22 in base::ConditionVariable::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973c5 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d793c1 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 15 (Thread 0x7f4d537fe700 (LWP 2680)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d97335 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973f5 in base::WaitableEvent::Wait() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d79383 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 14 (Thread 0x7f4d53fff700 (LWP 2679)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db086f950 in mojo::system::Waiter::Wait(unsigned long, unsigned long*) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0858770 in mojo::system::Core::WaitManyInternal(unsigned int const*, unsigned int const*, unsigned int, unsigned long, unsigned int*, mojo::system::HandleSignalsState*) () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0858afb in mojo::system::Core::Wait(unsigned int, unsigned int, unsigned long, mojo::system::UserPointer<MojoHandleSignalsState>) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db085477a in MojoWait () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db1aee79e in mojo::common::MessagePumpMojo::WaitForReadyHandles(mojo::common::MessagePumpMojo::RunState const&) const () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4db1af0b54 in mojo::common::MessagePumpMojo::DoInternalWork(mojo::common::MessagePumpMojo::RunState const&, bool) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db1af0ba5 in mojo::common::MessagePumpMojo::DoRunLoop(mojo::common::MessagePumpMojo::RunState*, base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db1af0c79 in mojo::common::MessagePumpMojo::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#12 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#13 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#14 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 13 (Thread 0x7f4d74ff9700 (LWP 2678)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db03880cd in cc::SingleThreadTaskGraphRunner::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0da27ae in base::DelegateSimpleThread::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0da28d0 in base::SimpleThread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 12 (Thread 0x7f4d757fa700 (LWP 2677)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d97335 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973f5 in base::WaitableEvent::Wait() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d79383 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 11 (Thread 0x7f4d75ffb700 (LWP 2676)):
[KCrash Handler]
#6 0x00007f4dbe8eef20 in QArrayData::shared_null () at /usr/lib64/libQt5Core.so.5
#7 0x00007f4daf3da2a1 in QtWebEngineCore::NetworkDelegateQt::OnBeforeURLRequest(net::URLRequest*, base::Callback<void (int)> const&, GURL*) (this=0x7f4d5c013820, request=<optimized out>, callback=..., newUrl=0x7f4d5c78de80) at /usr/src/debug/qtwebengine-opensource-src-5.7.1/src/core/network_delegate_qt.cpp:114
#8 0x00007f4dafebae80 in net::NetworkDelegate::NotifyBeforeURLRequest(net::URLRequest*, base::Callback<void (int)> const&, GURL*) () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4dafe5850d in net::URLRequest::Start() () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db0024ed0 in content::ResourceLoader::StartRequestInternal() () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db0024f88 in content::ResourceLoader::StartRequest() () at /usr/lib64/libQt5WebEngineCore.so.5
#12 0x00007f4db001d406 in content::ResourceDispatcherHostImpl::StartLoading(content::ResourceRequestInfoImpl*, linked_ptr<content::ResourceLoader> const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#13 0x00007f4db001fb76 in content::ResourceDispatcherHostImpl::BeginRequestInternal(scoped_ptr<net::URLRequest, std::default_delete<net::URLRequest> >, scoped_ptr<content::ResourceHandler, std::default_delete<content::ResourceHandler> >) () at /usr/lib64/libQt5WebEngineCore.so.5
#14 0x00007f4db0022640 in content::ResourceDispatcherHostImpl::BeginRequest(int, ResourceHostMsg_Request const&, IPC::Message*, int) () at /usr/lib64/libQt5WebEngineCore.so.5
#15 0x00007f4db0022bfd in content::ResourceDispatcherHostImpl::OnRequestResource(int, int, ResourceHostMsg_Request const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#16 0x00007f4db0024315 in content::ResourceDispatcherHostImpl::OnMessageReceived(IPC::Message const&, content::ResourceMessageFilter*) () at /usr/lib64/libQt5WebEngineCore.so.5
#17 0x00007f4daff9ee89 in content::BrowserMessageFilter::Internal::OnMessageReceived(IPC::Message const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#18 0x00007f4db09fd14e in IPC::(anonymous namespace)::TryFiltersImpl(std::vector<IPC::MessageFilter*, std::allocator<IPC::MessageFilter*> >&, IPC::Message const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#19 0x00007f4db09f5018 in IPC::ChannelProxy::Context::TryFilters(IPC::Message const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#20 0x00007f4db09f50e1 in IPC::ChannelProxy::Context::OnMessageReceived(IPC::Message const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#21 0x00007f4db09f608d in IPC::internal::ChannelReader::DispatchMessage(IPC::Message*) () at /usr/lib64/libQt5WebEngineCore.so.5
#22 0x00007f4db09f6444 in IPC::internal::ChannelReader::HandleExternalMessage(IPC::Message*, std::vector<IPC::BrokerableAttachment::AttachmentId, std::allocator<IPC::BrokerableAttachment::AttachmentId> > const&) [clone .part.68] () at /usr/lib64/libQt5WebEngineCore.so.5
#23 0x00007f4db09f65fa in IPC::internal::ChannelReader::HandleExternalMessage(IPC::Message*, std::vector<IPC::BrokerableAttachment::AttachmentId, std::allocator<IPC::BrokerableAttachment::AttachmentId> > const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#24 0x00007f4db09f6741 in IPC::internal::ChannelReader::TranslateInputData(char const*, int) () at /usr/lib64/libQt5WebEngineCore.so.5
#25 0x00007f4db09f6ac4 in IPC::internal::ChannelReader::ProcessIncomingMessages() () at /usr/lib64/libQt5WebEngineCore.so.5
#26 0x00007f4db09f3dc2 in IPC::ChannelPosix::OnFileCanReadWithoutBlocking(int) () at /usr/lib64/libQt5WebEngineCore.so.5
#27 0x00007f4db0d5093e in base::MessagePumpLibevent::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(int, base::MessagePumpLibevent*) () at /usr/lib64/libQt5WebEngineCore.so.5
#28 0x00007f4db0d50aa6 in base::MessagePumpLibevent::OnLibeventNotification(int, short, void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#29 0x00007f4da90553b6 in event_base_loop () at /usr/lib64/libevent-2.0.so.5
#30 0x00007f4db0d50015 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#31 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#32 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#33 0x00007f4daffaf698 in content::BrowserThreadImpl::IOThreadRun(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#34 0x00007f4daffaf7db in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#35 0x00007f4db0da2f08 in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#36 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#37 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#38 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 10 (Thread 0x7f4d767fc700 (LWP 2675)):
#0 0x00007f4dbdd76b3b in __lll_lock_wait_private () at /lib64/libc.so.6
#1 0x00007f4dbdd785f4 in __fprintf_chk () at /lib64/libc.so.6
#2 0x00007f4da906656e in () at /usr/lib64/libevent-2.0.so.5
#3 0x00007f4da9066764 in event_warn () at /usr/lib64/libevent-2.0.so.5
#4 0x00007f4da906aee8 in () at /usr/lib64/libevent-2.0.so.5
#5 0x00007f4da9054e8a in event_base_loop () at /usr/lib64/libevent-2.0.so.5
#6 0x00007f4db0d4fece in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4daffaf5e8 in content::BrowserThreadImpl::CacheThreadRun(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4daffaf83b in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db0da2f08 in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#12 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#13 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#14 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7f4d76ffd700 (LWP 2674)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d97335 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973f5 in base::WaitableEvent::Wait() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d79383 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4daffaf538 in content::BrowserThreadImpl::ProcessLauncherThreadRun(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4daffaf82b in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0da2f08 in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f4d777fe700 (LWP 2673)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d97335 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973f5 in base::WaitableEvent::Wait() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d79383 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4daffaf488 in content::BrowserThreadImpl::FileUserBlockingThreadRun(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4daffaf81b in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0da2f08 in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f4d77fff700 (LWP 2672)):
#0 0x00007f4dbdd76b3b in __lll_lock_wait_private () at /lib64/libc.so.6
#1 0x00007f4dbdd785f4 in __fprintf_chk () at /lib64/libc.so.6
#2 0x00007f4da906656e in () at /usr/lib64/libevent-2.0.so.5
#3 0x00007f4da9066764 in event_warn () at /usr/lib64/libevent-2.0.so.5
#4 0x00007f4da906aee8 in () at /usr/lib64/libevent-2.0.so.5
#5 0x00007f4da9054e8a in event_base_loop () at /usr/lib64/libevent-2.0.so.5
#6 0x00007f4db0d4fece in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4daffaf3d8 in content::BrowserThreadImpl::FileThreadRun(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4daffaf80b in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db0da2f08 in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#12 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#13 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#14 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f4d8c980700 (LWP 2671)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d97335 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973f5 in base::WaitableEvent::Wait() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d79383 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4daffaf328 in content::BrowserThreadImpl::DBThreadRun(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4daffaf7fb in content::BrowserThreadImpl::Run(base::MessageLoop*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0da2f08 in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f4d8e183700 (LWP 2668)):
#0 0x00007f4db9c0910f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f4db0d97335 in base::WaitableEvent::TimedWait(base::TimeDelta const&) () at /usr/lib64/libQt5WebEngineCore.so.5
#2 0x00007f4db0d973f5 in base::WaitableEvent::Wait() () at /usr/lib64/libQt5WebEngineCore.so.5
#3 0x00007f4db0d79383 in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#4 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#5 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#6 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f4d8eb91700 (LWP 2667)):
#0 0x00007f4dbdd76b3b in __lll_lock_wait_private () at /lib64/libc.so.6
#1 0x00007f4dbdd785f4 in __fprintf_chk () at /lib64/libc.so.6
#2 0x00007f4da906656e in () at /usr/lib64/libevent-2.0.so.5
#3 0x00007f4da9066764 in event_warn () at /usr/lib64/libevent-2.0.so.5
#4 0x00007f4da906aee8 in () at /usr/lib64/libevent-2.0.so.5
#5 0x00007f4da9054e8a in event_base_loop () at /usr/lib64/libevent-2.0.so.5
#6 0x00007f4db0d4fece in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at /usr/lib64/libQt5WebEngineCore.so.5
#7 0x00007f4db0d8adba in base::RunLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#8 0x00007f4db0d75855 in base::MessageLoop::Run() () at /usr/lib64/libQt5WebEngineCore.so.5
#9 0x00007f4db0da2e8a in base::Thread::ThreadMain() () at /usr/lib64/libQt5WebEngineCore.so.5
#10 0x00007f4db0d9f46c in base::(anonymous namespace)::ThreadFunc(void*) () at /usr/lib64/libQt5WebEngineCore.so.5
#11 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#12 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f4d95fdf700 (LWP 2660)):
#0 0x00007f4dbdd5d6dd in read () at /lib64/libc.so.6
#1 0x00007f4db7a36ab0 in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f4db79f234e in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f4db79f2824 in () at /usr/lib64/libglib-2.0.so.0
#4 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#5 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4d900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4d95fdec50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7 0x00007f4dbe66f813 in QThread::exec() (this=this@entry=0x7f4dbd1e0d20 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:507
#8 0x00007f4dbcf6f385 in QDBusConnectionManager::run() (this=0x7f4dbd1e0d20 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#9 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x7f4dbd1e0d20 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368
#10 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f4da077b700 (LWP 2659)):
#0 0x00007f4dbdd6166d in poll () at /lib64/libc.so.6
#1 0x00007f4db96db3e0 in () at /usr/lib64/libxcb.so.1
#2 0x00007f4db96dd179 in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3 0x00007f4da268b889 in QXcbEventReader::run() (this=0x1c49540) at qxcbconnection.cpp:1343
#4 0x00007f4dbe6744c8 in QThreadPrivate::start(void*) (arg=0x1c49540) at thread/qthread_unix.cpp:368
#5 0x00007f4db9c03454 in start_thread () at /lib64/libpthread.so.0
#6 0x00007f4dbdd6a37f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f4dc1338440 (LWP 2658)):
#0 0x00007fff8f6fca5d in clock_gettime ()
#1 0x00007f4dbdd77216 in clock_gettime () at /lib64/libc.so.6
#2 0x00007f4dbe719771 in qt_gettime() (ts=0x7fff8f686620, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:109
#3 0x00007f4dbe719771 in qt_gettime() (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:164
#4 0x00007f4dbe719771 in qt_gettime() () at tools/qelapsedtimer_unix.cpp:173
#5 0x00007f4dbe895e09 in QTimerInfoList::updateCurrentTime() (this=0x1c97db0) at kernel/qtimerinfo_unix.cpp:91
#6 0x00007f4dbe897ae5 in timerSourceCheck(GSource*) (src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:146
#7 0x00007f4dbe897ae5 in timerSourceCheck(GSource*) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:173
#8 0x00007f4db79f2289 in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#9 0x00007f4db79f2824 in () at /usr/lib64/libglib-2.0.so.0
#10 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#11 0x00007f4dbe89818b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1c8b7c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#12 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff8f686850, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#13 0x00007f4dbf7203b7 in QDialog::exec() (this=0x705d440) at dialogs/qdialog.cpp:552
#14 0x00007f4dbda141b7 in () at /usr/lib64/libKF5AkonadiContact.so.5
#15 0x00007f4dbda10099 in () at /usr/lib64/libKF5AkonadiContact.so.5
#16 0x00007f4dbe86f709 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0xe4a6760, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff8f686b30) at kernel/qobject.cpp:3740
#17 0x00007f4dbe870027 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0xe4a6760, m=m@entry=0x7f4dbfc09f80 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff8f686b30) at kernel/qobject.cpp:3602
#18 0x00007f4dbf52b4e2 in QAction::triggered(bool) (this=this@entry=0xe4a6760, _t1=<optimized out>) at .moc/moc_qaction.cpp:369
#19 0x00007f4dbf52ded0 in QAction::activate(QAction::ActionEvent) (this=0xe4a6760, event=<optimized out>) at kernel/qaction.cpp:1170
#20 0x00007f4dbf52e47f in QAction::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (this=<optimized out>) at kernel/qaction.h:183
#21 0x00007f4dbf52e47f in QAction::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qaction.cpp:206
#22 0x00007f4dbe86f709 in QMetaObject::activate(QObject*, int, int, void**) (sender=0x94b0ae0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#23 0x00007f4db729e5c5 in Akonadi::EntityTreeView::doubleClicked(Akonadi::Item const&) () at /usr/lib64/libKF5AkonadiWidgets.so.5
#24 0x00007f4db729f211 in () at /usr/lib64/libKF5AkonadiWidgets.so.5
#25 0x00007f4db729fd65 in () at /usr/lib64/libKF5AkonadiWidgets.so.5
#26 0x00007f4dbe86f709 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x94b0ae0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff8f686ed0) at kernel/qobject.cpp:3740
#27 0x00007f4dbe870027 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x94b0ae0, m=m@entry=0x7f4dbfc27e40 <QAbstractItemView::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff8f686ed0) at kernel/qobject.cpp:3602
#28 0x00007f4dbf77b675 in QAbstractItemView::doubleClicked(QModelIndex const&) (this=this@entry=0x94b0ae0, _t1=...) at .moc/moc_qabstractitemview.cpp:653
#29 0x00007f4dbf7c655a in QTreeView::mouseDoubleClickEvent(QMouseEvent*) (this=0x94b0ae0, event=0x7fff8f687660) at itemviews/qtreeview.cpp:1943
#30 0x00007f4dbf579f3f in QWidget::event(QEvent*) (this=this@entry=0x94b0ae0, event=event@entry=0x7fff8f687660) at kernel/qwidget.cpp:8789
#31 0x00007f4dbf661cfe in QFrame::event(QEvent*) (this=0x94b0ae0, e=0x7fff8f687660) at widgets/qframe.cpp:550
#32 0x00007f4dbf788a43 in QAbstractItemView::viewportEvent(QEvent*) (this=this@entry=0x94b0ae0, event=event@entry=0x7fff8f687660) at itemviews/qabstractitemview.cpp:1747
#33 0x00007f4dbf7c84ac in QTreeView::viewportEvent(QEvent*) (this=0x94b0ae0, event=0x7fff8f687660) at itemviews/qtreeview.cpp:1320
#34 0x00007f4dbe843861 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) (receiver=receiver@entry=0x2f38c00, event=event@entry=0x7fff8f687660) at kernel/qcoreapplication.cpp:1099
#35 0x00007f4dbf531e85 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x2f38c00, e=0x7fff8f687660) at kernel/qapplication.cpp:3795
#36 0x00007f4dbf53a51d in QApplication::notify(QObject*, QEvent*) (this=<optimized out>, receiver=0x2f38c00, e=0x7fff8f687660) at kernel/qapplication.cpp:3273
#37 0x00007f4dbe843b00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=receiver@entry=0x2f38c00, event=event@entry=0x7fff8f687660) at kernel/qcoreapplication.cpp:988
#38 0x00007f4dbf538bcd in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) (event=<optimized out>, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231
#39 0x00007f4dbf538bcd in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) (receiver=receiver@entry=0x2f38c00, event=event@entry=0x7fff8f687660, alienWidget=alienWidget@entry=0x2f38c00, nativeWidget=0x1fcd150, buttonDown=buttonDown@entry=0x7f4dbfc38830 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2771
#40 0x00007f4dbf593c06 in QWidgetWindow::handleMouseEvent(QMouseEvent*) (this=this@entry=0x23284d0, event=event@entry=0x7fff8f687af0) at kernel/qwidgetwindow.cpp:617
#41 0x00007f4dbf596613 in QWidgetWindow::event(QEvent*) (this=0x23284d0, event=0x7fff8f687af0) at kernel/qwidgetwindow.cpp:239
#42 0x00007f4dbf531eac in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x23284d0, e=0x7fff8f687af0) at kernel/qapplication.cpp:3799
#43 0x00007f4dbf539661 in QApplication::notify(QObject*, QEvent*) (this=0x7fff8f6880c0, receiver=0x23284d0, e=0x7fff8f687af0) at kernel/qapplication.cpp:3556
#44 0x00007f4dbe843b00 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=receiver@entry=0x23284d0, event=event@entry=0x7fff8f687af0) at kernel/qcoreapplication.cpp:988
#45 0x00007f4dbed9097f in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) (event=0x7fff8f687af0, receiver=0x23284d0) at ../../src/corelib/kernel/qcoreapplication.h:234
#46 0x00007f4dbed9097f in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) (e=<optimized out>) at kernel/qguiapplication.cpp:1946
#47 0x00007f4dbed927c5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x921ba90) at kernel/qguiapplication.cpp:1687
#48 0x00007f4dbed7075b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:659
#49 0x00007f4da26c2210 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:76
#50 0x00007f4db79f2687 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#51 0x00007f4db79f28f0 in () at /usr/lib64/libglib-2.0.so.0
#52 0x00007f4db79f299c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#53 0x00007f4dbe89816f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1c8b7c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#54 0x00007f4dbe841aea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff8f687e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#55 0x00007f4dbe84a25c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1261
#56 0x0000000000404717 in ()
#57 0x00007f4dbdca1291 in __libc_start_main () at /lib64/libc.so.6
#58 0x0000000000404c3a in _start ()

Reported using DrKonqi