Application: kmail (5.7.3)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 5.0.0-25-generic x86_64
Distribution: Ubuntu 18.04.3 LTS

-- Information about the crash:
- What I was doing when the application crashed: Checking mail, KMail was hanging with "Updating folder". The crash occurred upon closing KMail via the systray icon (Quit, Ctrl-Q).

I have 2 IMAP accounts and one POP3 account. Because of the very slow "Updating folder" I recently switched to store mails locally as well. Similar crashes happened before as well.

The crash can be reproduced sometimes.

-- 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 0x7fe93f088b80 (LWP 19556))]

Thread 29 (Thread 0x7fe8cb7fe700 (LWP 20717)):
#0  0x00007fe931a5ced9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7fe8cb7fd7e0, expected=0, futex_word=0x7fe8c4004674) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fe931a5ced9 in __pthread_cond_wait_common (abstime=0x7fe8cb7fd880, mutex=0x7fe8c4004620, cond=0x7fe8c4004648) at pthread_cond_wait.c:533
#2  0x00007fe931a5ced9 in __pthread_cond_timedwait (cond=0x7fe8c4004648, mutex=0x7fe8c4004620, abstime=0x7fe8cb7fd880) at pthread_cond_wait.c:667
#3  0x00007fe92692b652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe926901799 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe926901cfb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe8cb7fe700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 28 (Thread 0x7fe864fc1700 (LWP 19642)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5589b7a0751c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5589b7a074c8, cond=0x5589b7a074f0) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x5589b7a074f0, mutex=0x5589b7a074c8) at pthread_cond_wait.c:655
#3  0x00007fe9268fcc95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268fd177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268fdf11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe864fc1700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 27 (Thread 0x7fe85ffff700 (LWP 19636)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5589b7a0751c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5589b7a074c8, cond=0x5589b7a074f0) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x5589b7a074f0, mutex=0x5589b7a074c8) at pthread_cond_wait.c:655
#3  0x00007fe9268fcc95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268fd177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268fdf11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe85ffff700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7fe8670ad700 (LWP 19633)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe9231c5fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe9231c5f68, cond=0x7fe9231c5f90) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe9231c5f90, mutex=0x7fe9231c5f68) at pthread_cond_wait.c:655
#3  0x00007fe922ecf5f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007fe922ecf639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007fe931a566db in start_thread (arg=0x7fe8670ad700) at pthread_create.c:463
#6  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7fe86873c700 (LWP 19616)):
#0  0x00007fe93c1550b4 in __GI___libc_read (fd=82, buf=0x7fe86873b810, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fe92fe452d0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe92fe000b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe92fe00570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe92fe006dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe93caa290b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe93c86622a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fe931a566db in start_thread (arg=0x7fe86873c700) at pthread_create.c:463
#10 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7fe88b7fe700 (LWP 19600)):
#0  0x00007fe93c159bf9 in __GI___poll (fds=0x7fe874007030, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe91f880481 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007fe91f871e40 in pa_mainloop_poll () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007fe91f8724d0 in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007fe91f872560 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007fe91f8803c9 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007fe916eae318 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#7  0x00007fe931a566db in start_thread (arg=0x7fe88b7fe700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7fe88bfff700 (LWP 19599)):
#0  0x00007fe931a5ced9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7fe88bffe5d0, expected=0, futex_word=0x7fe88bffe758) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fe931a5ced9 in __pthread_cond_wait_common (abstime=0x7fe88bffe670, mutex=0x7fe88bffe708, cond=0x7fe88bffe730) at pthread_cond_wait.c:533
#2  0x00007fe931a5ced9 in __pthread_cond_timedwait (cond=0x7fe88bffe730, mutex=0x7fe88bffe708, abstime=0x7fe88bffe670) at pthread_cond_wait.c:667
#3  0x00007fe92692b652 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f291e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd52b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268fe4d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe931a566db in start_thread (arg=0x7fe88bfff700) at pthread_create.c:463
#11 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7fe8a4ff9700 (LWP 19598)):
#0  0x00007fe93c1756ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007fe93c177474 in ___fprintf_chk (fp=0x7fe93c4328b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fe91d9006a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fe91d8e89ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007fe91d8e8b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007fe91d8ea46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007fe91d8e0114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007fe9268cdb0d in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9268fe4d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe931a566db in start_thread (arg=0x7fe8a4ff9700) at pthread_create.c:463
#12 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7fe8a57fa700 (LWP 19597)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8a57f9738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8a57f96e8, cond=0x7fe8a57f9710) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8a57f9710, mutex=0x7fe8a57f96e8) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268fe4d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe931a566db in start_thread (arg=0x7fe8a57fa700) at pthread_create.c:463
#11 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7fe8a5ffb700 (LWP 19596)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5589b7b36d38) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5589b7b36c78, cond=0x5589b7b36d10) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x5589b7b36d10, mutex=0x5589b7b36c78) at pthread_cond_wait.c:655
#3  0x00007fe927084060 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268fdf11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe931a566db in start_thread (arg=0x7fe8a5ffb700) at pthread_create.c:463
#7  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7fe8a67fc700 (LWP 19595)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5589b7a0751c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5589b7a074c8, cond=0x5589b7a074f0) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x5589b7a074f0, mutex=0x5589b7a074c8) at pthread_cond_wait.c:655
#3  0x00007fe9268fcc95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268fd177 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268fdf11 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe8a67fc700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7fe8a6ffd700 (LWP 19594)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8a6ffc738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8a6ffc6e8, cond=0x7fe8a6ffc710) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8a6ffc710, mutex=0x7fe8a6ffc6e8) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268fe4d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe931a566db in start_thread (arg=0x7fe8a6ffd700) at pthread_create.c:463
#11 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7fe8a77fe700 (LWP 19593)):
#0  0x00007fe93c155187 in __GI___libc_write (fd=2, buf=0x7fe8a77fa6e0, nbytes=39) at ../sysdeps/unix/sysv/linux/write.c:27
#1  0x00007fe93c0d01bd in _IO_new_file_write (f=0x7fe93c431680 <_IO_2_1_stderr_>, data=0x7fe8a77fa6e0, n=39) at fileops.c:1203
#2  0x00007fe93c0d0b2f in new_do_write (to_do=<optimized out>, data=0x7fe8a77fa6e0 "[warn] epoll_wait: Bad file descriptor\n", fp=0x7fe93c431680 <_IO_2_1_stderr_>) at fileops.c:457
#3  0x00007fe93c0d0b2f in _IO_new_file_xsputn (f=0x7fe93c431680 <_IO_2_1_stderr_>, data=<optimized out>, n=39) at fileops.c:1277
#4  0x00007fe93c0a3707 in buffered_vfprintf (s=s@entry=0x7fe93c431680 <_IO_2_1_stderr_>, format=format@entry=0x7fe91d9006a8 "[%s] %s\n", args=args@entry=0x7fe8a77fcca0) at vfprintf.c:2350
#5  0x00007fe93c0a0726 in _IO_vfprintf_internal (s=s@entry=0x7fe93c431680 <_IO_2_1_stderr_>, format=0x7fe91d9006a8 "[%s] %s\n", ap=ap@entry=0x7fe8a77fcca0) at vfprintf.c:1301
#6  0x00007fe93c1774c6 in ___fprintf_chk (fp=0x7fe93c431680 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#7  0x00007fe91d8e89ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#8  0x00007fe91d8e8b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#9  0x00007fe91d8ea46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#10 0x00007fe91d8e0114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#11 0x00007fe9268cdab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007fe926184978 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007fe926184f2b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007fe9268fe588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#18 0x00007fe931a566db in start_thread (arg=0x7fe8a77fe700) at pthread_create.c:463
#19 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7fe8a7fff700 (LWP 19592)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8a7ffe358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8a7ffe308, cond=0x7fe8a7ffe330) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8a7ffe330, mutex=0x7fe8a7ffe308) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9261848c8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe926184f1b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe9268fe588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fe931a566db in start_thread (arg=0x7fe8a7fff700) at pthread_create.c:463
#13 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fe8c8ff9700 (LWP 19591)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8c8ff8358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8c8ff8308, cond=0x7fe8c8ff8330) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8c8ff8330, mutex=0x7fe8c8ff8308) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe926184818 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe926184f0b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe9268fe588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fe931a566db in start_thread (arg=0x7fe8c8ff9700) at pthread_create.c:463
#13 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fe8c97fa700 (LWP 19590)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8c97f9358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8c97f9308, cond=0x7fe8c97f9330) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8c97f9330, mutex=0x7fe8c97f9308) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe926184768 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe926184efb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe9268fe588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fe931a566db in start_thread (arg=0x7fe8c97fa700) at pthread_create.c:463
#13 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fe8c9ffb700 (LWP 19589)):
#0  0x00007fe93c1756ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007fe93c177474 in ___fprintf_chk (fp=0x7fe93c4328b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fe91d9006a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fe91d8e89ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007fe91d8e8b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007fe91d8ea46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007fe91d8e0114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007fe9268cdab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9261846b8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe926184eeb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe9268fe588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fe931a566db in start_thread (arg=0x7fe8c9ffb700) at pthread_create.c:463
#14 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fe8ca7fc700 (LWP 19588)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8ca7fb358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8ca7fb308, cond=0x7fe8ca7fb330) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8ca7fb330, mutex=0x7fe8ca7fb308) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe926184608 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe926184edb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe9268fe588 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fe931a566db in start_thread (arg=0x7fe8ca7fc700) at pthread_create.c:463
#13 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fe8cbfff700 (LWP 19585)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe8cbffe738) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe8cbffe6e8, cond=0x7fe8cbffe710) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x7fe8cbffe710, mutex=0x7fe8cbffe6e8) at pthread_cond_wait.c:655
#3  0x00007fe9268f2999 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fe9268f29c7 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fe9268cd4db in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268fe4d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe931a566db in start_thread (arg=0x7fe8cbfff700) at pthread_create.c:463
#11 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fe8d8e87700 (LWP 19584)):
#0  0x00007fe93c1756ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007fe93c177474 in ___fprintf_chk (fp=0x7fe93c4328b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fe91d9006a8 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fe91d8e89ad in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007fe91d8e8b44 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007fe91d8ea46c in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007fe91d8e0114 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007fe9268cdab9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fe9268c9da8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fe9268e677b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fe9268fe4d6 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fe9268fa5eb in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fe931a566db in start_thread (arg=0x7fe8d8e87700) at pthread_create.c:463
#12 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fe8dae0d700 (LWP 19576)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5589b7a3f960) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5589b7a3f910, cond=0x5589b7a3f938) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x5589b7a3f938, mutex=0x5589b7a3f910) at pthread_cond_wait.c:655
#3  0x00007fe93c86c59b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe93c864c0b in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe8dbdfb80c in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/texttospeech/libqttexttospeech_flite.so
#6  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe8dae0d700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fe8e4a0b700 (LWP 19573)):
#0  0x00007fe93c159bf9 in __GI___poll (fds=0x7fe8dc0049b0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe92fe005c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe92fe006dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe93caa290b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe93c86622a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe8e4a0b700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fe8f5ba8700 (LWP 19568)):
#0  0x00007fe93c1756ac in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1  0x00007fe93c177474 in ___fprintf_chk (fp=0x7fe93c4328b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fe93cb35da8 "%s\n") at fprintf_chk.c:30
#2  0x00007fe93c859efd in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fe93c854467 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe93c85528e in QMessageLogger::warning(char const*, ...) const () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe93caa2797 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe92fdfffe1 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fe92fe00570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fe92fe006dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007fe93caa290b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fe93c86622a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fe931a566db in start_thread (arg=0x7fe8f5ba8700) at pthread_create.c:463
#14 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fe8f63a9700 (LWP 19567)):
#0  0x00007fe92fe006b7 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fe93caa290b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fe93c86622a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe931a566db in start_thread (arg=0x7fe8f63a9700) at pthread_create.c:463
#6  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fe8f6dee700 (LWP 19566)):
#0  0x00007fe93c159bf9 in __GI___poll (fds=0x7fe8e8004a10, nfds=1, timeout=9939) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe92fe005c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe92fe006dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe93caa290b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe93c86622a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe931a566db in start_thread (arg=0x7fe8f6dee700) at pthread_create.c:463
#8  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fe8f7fff700 (LWP 19563)):
#0  0x00007fe93c1550b4 in __GI___libc_read (fd=8, buf=0x7fe8f7ffe7e0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fe92fe452d0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe92fe000b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe92fe00570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe92fe006dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe93caa290b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe93c86622a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe93b09fd45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe931a566db in start_thread (arg=0x7fe8f7fff700) at pthread_create.c:463
#11 0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fe8fe62b700 (LWP 19562)):
#0  0x00007fe931a5c9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5589b752c62c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe931a5c9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5589b752c5d8, cond=0x5589b752c600) at pthread_cond_wait.c:502
#2  0x00007fe931a5c9f3 in __pthread_cond_wait (cond=0x5589b752c600, mutex=0x5589b752c5d8) at pthread_cond_wait.c:655
#3  0x00007fe8ff4d20aa in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fe8ff4d1dd7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fe931a566db in start_thread (arg=0x7fe8fe62b700) at pthread_create.c:463
#6  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fe906cfa700 (LWP 19561)):
#0  0x00007fe93c159bf9 in __GI___poll (fds=0x7fe906cf9928, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe92f22e747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fe92f23036a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fe9089f52a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fe93c86b16d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe931a566db in start_thread (arg=0x7fe906cfa700) at pthread_create.c:463
#6  0x00007fe93c16688f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fe93f088b80 (LWP 19556)):
[KCrash Handler]
#6  0x00007fe937b66a70 in WebEngineViewer::WebEngineView::clearRelativePosition() () at /usr/lib/x86_64-linux-gnu/libKF5WebEngineViewer.so.5abi3
#7  0x00007fe938ee4e9d in  () at /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5abi4
#8  0x00007fe938eed0b4 in  () at /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5abi4
#9  0x00007fe938ed990b in MessageViewer::Viewer::setMessage(QSharedPointer<KMime::Message> const&, MimeTreeParser::UpdateMode) () at /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5abi4
#10 0x00007fe938eda800 in MessageViewer::Viewer::clear(MimeTreeParser::UpdateMode) () at /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5abi4
#11 0x00007fe93e9316f2 in KMMainWidget::itemsFetchDone(KJob*) () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#12 0x00007fe93ca786cf in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fe93def3fdc in KJob::result(KJob*, KJob::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#14 0x00007fe93def4b11 in KJob::finishJob(bool) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#15 0x00007fe93def4b72 in KJob::kill(KJob::KillVerbosity) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#16 0x00007fe93612a0a5 in Akonadi::Session::clear() () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5abi1
#17 0x00007fe93612a0d7 in Akonadi::Session::~Session() () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5abi1
#18 0x00007fe93612a0f9 in Akonadi::Session::~Session() () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5abi1
#19 0x00007fe93ca7619b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fe93ca7f9cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fe938ee8019 in  () at /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5abi4
#22 0x00007fe93ca7619b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007fe93d801d4c in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007fe938ed9879 in MessageViewer::Viewer::~Viewer() () at /usr/lib/x86_64-linux-gnu/libKF5MessageViewer.so.5abi4
#25 0x00007fe93ca7619b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fe93d801d4c in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007fe93e8fedf9 in KMReaderWin::~KMReaderWin() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#28 0x00007fe93ca7619b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fe93d801d4c in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007fe93d970639 in QSplitter::~QSplitter() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007fe93ca7619b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fe93d801d4c in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007fe93d970639 in QSplitter::~QSplitter() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007fe93e9301f3 in KMMainWidget::deleteWidgets() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#35 0x00007fe93e949d41 in KMMainWidget::destruct() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#36 0x00007fe93e949f1f in KMMainWidget::~KMMainWidget() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#37 0x00007fe93e94a0f9 in KMMainWidget::~KMMainWidget() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#38 0x00007fe93ca7619b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007fe93d801d4c in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#40 0x00007fe93bb5773d in KMainWindow::~KMainWindow() () at /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#41 0x00007fe93e8fbd6a in KMMainWin::~KMMainWin() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#42 0x00007fe93e8fbdd9 in KMMainWin::~KMMainWin() () at /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#43 0x00007fe93ca79140 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007fe93d806743 in QWidget::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#45 0x00007fe93d919c4b in QMainWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#46 0x00007fe93bb59b87 in KMainWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#47 0x00007fe93bb9e9e5 in KXmlGuiWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#48 0x00007fe93d7c782c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#49 0x00007fe93d7cf0f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#50 0x00007fe93ca499a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#51 0x00007fe93ca4c11d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#52 0x00007fe93caa32c3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#53 0x00007fe92fe00417 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#54 0x00007fe92fe00650 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#55 0x00007fe92fe006dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#56 0x00007fe93caa28ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#57 0x00007fe93ca479ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#58 0x00007fe93ca50a84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#59 0x00005589b67507cd in  ()
#60 0x00007fe93c066b97 in __libc_start_main (main=0x5589b674f840, argc=3, argv=0x7ffea5262a78, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffea5262a68) at ../csu/libc-start.c:310
#61 0x00005589b67508fa in _start ()

Reported using DrKonqi