Application: kmail (5.6.0)

Qt Version: 5.9.1
Frameworks Version: 5.37.0
Operating System: Linux 4.10.0-32-generic x86_64
Distribution: KDE neon Developer Edition

-- Information about the crash:
- What I was doing when the application crashed:
in KMail, i went to  Tools > Configure KMail.

made a couple changes, clicked apply, and crash.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbb63ce9940 (LWP 20672))]

Thread 23 (Thread 0x7fba23bf5700 (LWP 20765)):
#0  0x00007fbb648e670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbb590dd38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb590dd49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb6521a94b in QEventDispatcherGlib::processEvents (this=0x7fba1c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fbb651c37ca in QEventLoop::exec (this=this@entry=0x7fba23bf4c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007fbb64feccd4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#6  0x00007fbb64ff1989 in QThreadPrivate::start (arg=0x3f06cc0) at thread/qthread_unix.cpp:368
#7  0x00007fbb5ac6a6ba in start_thread (arg=0x7fba23bf5700) at pthread_create.c:333
#8  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 22 (Thread 0x7fba31b6a700 (LWP 20739)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5052436f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb50524b07 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb505258d0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5ac6a6ba in start_thread (arg=0x7fba31b6a700) at pthread_create.c:333
#6  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 21 (Thread 0x7fbab92a4700 (LWP 20738)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb4d33f784 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fbb4d33f7c9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbab92a4700) at pthread_create.c:333
#4  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 20 (Thread 0x7fbad2ffd700 (LWP 20709)):
#0  0x00007fbb648e670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbb49fd5861 in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007fbb49fc6e11 in pa_mainloop_poll () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007fbb49fc74ae in pa_mainloop_iterate () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007fbb49fc7560 in pa_mainloop_run () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007fbb49fd57a9 in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007fbb4335b078 in ?? () from /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-8.0.so
#7  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbad2ffd700) at pthread_create.c:333
#8  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 19 (Thread 0x7fbad37fe700 (LWP 20708)):
#0  0x00007fbb648e22ad in write () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbb64863bff in _IO_new_file_write (f=0x7fbb64bb0540 <_IO_2_1_stderr_>, data=0x7fbad37facf0, n=39) at fileops.c:1263
#2  0x00007fbb6486438a in new_do_write (to_do=39, data=0x7fbad37facf0 "[warn] epoll_wait: Bad file descriptor\n", fp=0x7fbb64bb0540 <_IO_2_1_stderr_>) at fileops.c:518
#3  _IO_new_file_xsputn (f=0x7fbb64bb0540 <_IO_2_1_stderr_>, data=<optimized out>, n=39) at fileops.c:1342
#4  0x00007fbb6483af94 in buffered_vfprintf (s=0x7fbb64bb0540 <_IO_2_1_stderr_>, format=<optimized out>, args=<optimized out>) at vfprintf.c:2341
#5  0x00007fbb6483832d in _IO_vfprintf_internal (s=s@entry=0x7fbb64bb0540 <_IO_2_1_stderr_>, format=0x7fbb47fc9734 "[%s] %s\n", ap=ap@entry=0x7fbad37fd2a8) at vfprintf.c:1293
#6  0x00007fbb64901b89 in ___fprintf_chk (fp=0x7fbb64bb0540 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#7  0x00007fbb47fb145e in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#8  0x00007fbb47fb1654 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#9  0x00007fbb47fb5c38 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#10 0x00007fbb47f9fe2d in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#11 0x00007fbb504f57f9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007fbb50525d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbad37fe700) at pthread_create.c:333
#17 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 18 (Thread 0x7fbad3fff700 (LWP 20707)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb50525d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbad3fff700) at pthread_create.c:333
#9  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7fbaf0ff9700 (LWP 20706)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007fbb50551d22 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a284 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f5218 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb50525d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf0ff9700) at pthread_create.c:333
#9  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 16 (Thread 0x7fbaf17fa700 (LWP 20705)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb50c909dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb505258d0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf17fa700) at pthread_create.c:333
#5  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7fbaf1ffb700 (LWP 20704)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb50525d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf1ffb700) at pthread_create.c:333
#9  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7fbaf27fc700 (LWP 20703)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5052436f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb50524b07 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb505258d0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf27fc700) at pthread_create.c:333
#6  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7fbaf2ffd700 (LWP 20702)):
#0  __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007fbb64901b34 in ___fprintf_chk (fp=0x7fbb64bb1770 <_IO_stdfile_2_lock>, flag=1, format=0x7fbb47fc9734 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fbb47fb145e in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#3  0x00007fbb47fb1654 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007fbb47fb5c38 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007fbb47f9fe2d in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007fbb504f58b2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb4fdeea98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb4fdeec7b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fbb50525e60 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf2ffd700) at pthread_create.c:333
#14 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7fbaf37fe700 (LWP 20701)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb4fdee9e8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb4fdeecdb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb50525e60 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf37fe700) at pthread_create.c:333
#11 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7fbaf3fff700 (LWP 20700)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb4fdee938 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb4fdeeccb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb50525e60 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbaf3fff700) at pthread_create.c:333
#11 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7fbb14ff9700 (LWP 20699)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb4fdee888 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb4fdeecbb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb50525e60 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb14ff9700) at pthread_create.c:333
#11 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7fbb157fa700 (LWP 20698)):
#0  0x00007fbb64839cc0 in _IO_vfprintf_internal (s=s@entry=0x7fbb157f8d80, format=<optimized out>, format@entry=0x7fbb47fca2ef ": %s", ap=ap@entry=0x7fbb157f8f10) at vfprintf.c:1632
#1  0x00007fbb64901856 in ___vsnprintf_chk (s=0x7fbb157f8ffa ": Bad file des2", maxlen=<optimized out>, flags=1, slen=<optimized out>, format=0x7fbb47fca2ef ": %s", args=0x7fbb157f8f10) at vsnprintf_chk.c:63
#2  0x00007fbb47fb27c3 in evutil_vsnprintf () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#3  0x00007fbb47fb285f in evutil_snprintf () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007fbb47fb140c in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007fbb47fb1654 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007fbb47fb5c38 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#7  0x00007fbb47f9fe2d in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#8  0x00007fbb504f576e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fbb4fdee7d8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fbb4fdeecab in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fbb50525e60 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb157fa700) at pthread_create.c:333
#16 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fbb15ffb700 (LWP 20697)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb4fdee728 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb4fdeec9b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb50525e60 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb15ffb700) at pthread_create.c:333
#11 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fbb177fe700 (LWP 20694)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbb5051a1f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007fbb5051a2a4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007fbb504f51dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fbb50525d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb177fe700) at pthread_create.c:333
#9  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fbb17fff700 (LWP 20693)):
#0  __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007fbb64901b34 in ___fprintf_chk (fp=0x7fbb64bb1770 <_IO_stdfile_2_lock>, flag=1, format=0x7fbb47fc9734 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fbb47fb145e in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#3  0x00007fbb47fb1654 in event_warn () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#4  0x00007fbb47fb5c38 in ?? () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#5  0x00007fbb47f9fe2d in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#6  0x00007fbb504f57f9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fbb504f1225 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fbb5050defa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fbb50525d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fbb50521f3d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb17fff700) at pthread_create.c:333
#12 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fbb325e8700 (LWP 20679)):
#0  0x00007fbb64fe8b29 in std::__atomic_base<QMutexData*>::compare_exchange_strong (__m2=std::memory_order_acquire, __m1=std::memory_order_acquire, __p2=<optimized out>, __p1=@0x7fbb325e7a18: 0x0, this=0x1d02380) at /usr/include/c++/5/bits/atomic_base.h:752
#1  std::atomic<QMutexData*>::compare_exchange_strong (__m2=std::memory_order_acquire, __m1=std::memory_order_acquire, __p2=<optimized out>, __p1=@0x7fbb325e7a18: 0x0, this=0x1d02380) at /usr/include/c++/5/atomic:462
#2  QAtomicOps<QMutexData*>::testAndSetAcquire<QMutexData*> (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, _q_value=...) at ../../include/QtCore/../../src/corelib/arch/qatomic_cxx11.h:290
#3  QBasicAtomicPointer<QMutexData>::testAndSetAcquire (currentValue=<synthetic pointer>, newValue=<optimized out>, expectedValue=0x0, this=0x1d02380) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:262
#4  QBasicMutex::fastTryLock (current=<synthetic pointer>, this=0x1d02380) at thread/qmutex.h:101
#5  QMutex::lock (this=this@entry=0x1d02380) at thread/qmutex.cpp:224
#6  0x00007fbb6521a85f in QMutexLocker::QMutexLocker (m=0x1d02380, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:200
#7  QThreadData::canWaitLocked (this=0x1d02350) at ../../include/QtCore/5.9.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:253
#8  postEventSourcePrepare (s=0x7fbb240012d0, timeout=0x7fbb325e7ab4) at kernel/qeventdispatcher_glib.cpp:259
#9  0x00007fbb590dc91d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007fbb590dd2bb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007fbb590dd49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007fbb6521a94b in QEventDispatcherGlib::processEvents (this=0x7fbb240008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#13 0x00007fbb651c37ca in QEventLoop::exec (this=this@entry=0x7fbb325e7c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#14 0x00007fbb64feccd4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#15 0x00007fbb64ff1989 in QThreadPrivate::start (arg=0x1c525b0) at thread/qthread_unix.cpp:368
#16 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb325e8700) at pthread_create.c:333
#17 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fbb32de9700 (LWP 20678)):
#0  __GI___pthread_getspecific (key=6) at pthread_getspecific.c:55
#1  0x00007fbb59104060 in g_thread_self () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb590dd48d in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb6521a94b in QEventDispatcherGlib::processEvents (this=0x7fbb200008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fbb651c37ca in QEventLoop::exec (this=this@entry=0x7fbb32de8c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007fbb64feccd4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#6  0x00007fbb64ff1989 in QThreadPrivate::start (arg=0x1c649b0) at thread/qthread_unix.cpp:368
#7  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb32de9700) at pthread_create.c:333
#8  0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fbb335ea700 (LWP 20677)):
#0  0x00007fbb648e224d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fbb591206f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb590dce74 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb590dd330 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fbb590dd49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fbb6521a94b in QEventDispatcherGlib::processEvents (this=0x7fbb280008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007fbb651c37ca in QEventLoop::exec (this=this@entry=0x7fbb335e9c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7  0x00007fbb64feccd4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#8  0x00007fbb64ff1989 in QThreadPrivate::start (arg=0x1ca1c10) at thread/qthread_unix.cpp:368
#9  0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb335ea700) at pthread_create.c:333
#10 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fbb3899a700 (LWP 20676)):
#0  0x00007fbb64fe8b5b in QMutex::lock (this=this@entry=0x1c365f0) at thread/qmutex.cpp:230
#1  0x00007fbb6521ad69 in QMutexLocker::QMutexLocker (m=0x1c365f0, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:200
#2  QThreadData::canWaitLocked (this=0x1c365c0) at ../../include/QtCore/5.9.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:253
#3  postEventSourcePrepare (timeout=<synthetic pointer>, s=0x7fbb2c0012d0) at kernel/qeventdispatcher_glib.cpp:259
#4  postEventSourceCheck (source=0x7fbb2c0012d0) at kernel/qeventdispatcher_glib.cpp:269
#5  0x00007fbb590dcdc1 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fbb590dd330 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fbb590dd49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fbb6521a94b in QEventDispatcherGlib::processEvents (this=0x7fbb2c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#9  0x00007fbb651c37ca in QEventLoop::exec (this=this@entry=0x7fbb38999c50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#10 0x00007fbb64feccd4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#11 0x00007fbb67230b75 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#12 0x00007fbb64ff1989 in QThreadPrivate::start (arg=0x7fbb672a6da0) at thread/qthread_unix.cpp:368
#13 0x00007fbb5ac6a6ba in start_thread (arg=0x7fbb3899a700) at pthread_create.c:333
#14 0x00007fbb648f23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fbb63ce9940 (LWP 20672)):
[KCrash Handler]
#6  ConfigurePluginsListWidget::changeAgentActiveState (this=this@entry=0x93307c0, interfaceName=..., path=..., enable=false) at /workspace/build/src/configuredialog/configureplugins/configurepluginslistwidget.cpp:288
#7  0x00007fbb66afd111 in ConfigurePluginsListWidget::saveAkonadiAgent (this=this@entry=0x93307c0) at /workspace/build/src/configuredialog/configureplugins/configurepluginslistwidget.cpp:134
#8  0x00007fbb66afd49d in ConfigurePluginsListWidget::save (this=0x93307c0) at /workspace/build/src/configuredialog/configureplugins/configurepluginslistwidget.cpp:126
#9  0x00007fbb62fce407 in KCModuleProxy::save (this=this@entry=0x93374f0) at /workspace/build/src/kcmoduleproxy.cpp:234
#10 0x00007fbb62fca10b in KCMultiDialogPrivate::apply (this=<optimized out>) at /workspace/build/src/kcmultidialog.cpp:323
#11 0x00007fbb62fca2fd in KCMultiDialog::slotApplyClicked (this=this@entry=0x383ebb0) at /workspace/build/src/kcmultidialog.cpp:350
#12 0x00007fbb66b3b499 in ConfigureDialog::slotApply (this=0x383ebb0) at /workspace/build/src/configuredialog/configuredialog.cpp:82
#13 0x00007fbb651f1f46 in QtPrivate::QSlotObjectBase::call (a=0x7ffd9a10c1d0, r=0x383ebb0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101
#14 QMetaObject::activate (sender=sender@entry=0x89ebdb0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffd9a10c1d0) at kernel/qobject.cpp:3749
#15 0x00007fbb651f2527 in QMetaObject::activate (sender=sender@entry=0x89ebdb0, m=m@entry=0x7fbb6601a700 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffd9a10c1d0) at kernel/qobject.cpp:3628
#16 0x00007fbb65cf5502 in QAbstractButton::clicked (this=this@entry=0x89ebdb0, _t1=false) at .moc/moc_qabstractbutton.cpp:309
#17 0x00007fbb65cf5734 in QAbstractButtonPrivate::emitClicked (this=0x90852f0) at widgets/qabstractbutton.cpp:410
#18 0x00007fbb65cf73de in QAbstractButtonPrivate::click (this=0x90852f0) at widgets/qabstractbutton.cpp:403
#19 0x00007fbb65cf7554 in QAbstractButton::mouseReleaseEvent (this=0x89ebdb0, e=0x7ffd9a10c680) at widgets/qabstractbutton.cpp:1006
#20 0x00007fbb65b766d8 in QWidget::event (this=0x89ebdb0, event=0x7ffd9a10c680) at kernel/qwidget.cpp:9178
#21 0x00007fbb65b353fc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x89ebdb0, e=0x7ffd9a10c680) at kernel/qapplication.cpp:3717
#22 0x00007fbb65b3da2b in QApplication::notify (this=<optimized out>, receiver=0x89ebdb0, e=0x7ffd9a10c680) at kernel/qapplication.cpp:3193
#23 0x00007fbb651c5798 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x89ebdb0, event=event@entry=0x7ffd9a10c680) at kernel/qcoreapplication.cpp:1018
#24 0x00007fbb65b3c3cf in QCoreApplication::sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#25 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x89ebdb0, event=event@entry=0x7ffd9a10c680, alienWidget=alienWidget@entry=0x89ebdb0, nativeWidget=0x9084950, buttonDown=buttonDown@entry=0x7fbb66037c70 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2699
#26 0x00007fbb65b90446 in QWidgetWindow::handleMouseEvent (this=this@entry=0x93700f0, event=event@entry=0x7ffd9a10ca80) at kernel/qwidgetwindow.cpp:622
#27 0x00007fbb65b92ea3 in QWidgetWindow::event (this=0x93700f0, event=0x7ffd9a10ca80) at kernel/qwidgetwindow.cpp:243
#28 0x00007fbb65b353fc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x93700f0, e=0x7ffd9a10ca80) at kernel/qapplication.cpp:3717
#29 0x00007fbb65b3ce07 in QApplication::notify (this=0x7ffd9a10d510, receiver=0x93700f0, e=0x7ffd9a10ca80) at kernel/qapplication.cpp:3476
#30 0x00007fbb651c5798 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x93700f0, event=event@entry=0x7ffd9a10ca80) at kernel/qcoreapplication.cpp:1018
#31 0x00007fbb655bd940 in QCoreApplication::sendSpontaneousEvent (event=0x7ffd9a10ca80, receiver=0x93700f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#32 QGuiApplicationPrivate::processMouseEvent (e=0x93ecfa0) at kernel/qguiapplication.cpp:1949
#33 0x00007fbb655bf8a5 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x93ecfa0) at kernel/qguiapplication.cpp:1733
#34 0x00007fbb65599ceb in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:939
#35 0x00007fbb3e4cce00 in userEventSourceDispatch (source=<optimized out>) at qeventdispatcher_glib.cpp:77
#36 0x00007fbb590dd197 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007fbb590dd3f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007fbb590dd49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007fbb6521a92f in QEventDispatcherGlib::processEvents (this=0x187d870, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#40 0x00007fbb651c37ca in QEventLoop::exec (this=this@entry=0x7ffd9a10ce30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#41 0x00007fbb651cc704 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1291
#42 0x00007fbb655b52ec in QGuiApplication::exec () at kernel/qguiapplication.cpp:1679
#43 0x00007fbb65b35355 in QApplication::exec () at kernel/qapplication.cpp:2905
#44 0x0000000000403673 in main (argc=1, argv=0x7ffd9a10d748) at /workspace/build/src/main.cpp:157

Reported using DrKonqi