Bug 412663

Summary: kmail will SEGV repeatedly if I run it and immediately exit
Product: [Applications] kmail2 Reporter: Russell Coker <russell>
Component: UIAssignee: kdepim bugs <pim-bugs-null>
Status: REPORTED ---    
Severity: normal CC: olivier
Priority: NOR    
Version First Reported In: 5.9.3   
Target Milestone: ---   
Platform: Debian stable   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Russell Coker 2019-10-06 11:27:13 UTC 
Application: kmail (5.9.3)

Qt Version: 5.11.3
Frameworks Version: 5.54.0
Operating System: Linux 4.19.0-6-amd64 x86_64
Distribution: Debian GNU/Linux 10 (buster)

-- Information about the crash:
I just started kmail when logged in to the system via "ssh -Y localhost" and then quit it immediately.

Every time I do this it crashes.

This is a Debian system with some Debian packages recompiled with debugging code so the backtrace will be more useful.

The crash can be reproduced every time.

-- 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 0x7fc984c20f00 (LWP 26890))]

Thread 29 (Thread 0x7fc8fbfff700 (LWP 26951)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc8fbffe400, expected=0, futex_word=0x7fc8fbffe5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc8fbffe4a0, mutex=0x7fc8fbffe598, cond=0x7fc8fbffe5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc8fbffe5c0, mutex=0x7fc8fbffe598, abstime=0x7fc8fbffe4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 28 (Thread 0x7fc8ea139700 (LWP 26949)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc8ea138400, expected=0, futex_word=0x7fc8ea1385e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc8ea1384a0, mutex=0x7fc8ea138598, cond=0x7fc8ea1385c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc8ea1385c0, mutex=0x7fc8ea138598, abstime=0x7fc8ea1384a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 27 (Thread 0x7fc91cff9700 (LWP 26932)):
#0  0x00007fc99b6cf71b in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:63
#1  0x00007fc99b6d14e4 in ___fprintf_chk (fp=0x7fc99b7868b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fc98dce4848 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fc98dccca5a in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007fc98dcccc34 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007fc98dcce588 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007fc98dcc4329 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007fc992b1d7cd in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b5e204 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7fc91d7fa700 (LWP 26931)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc91d7f93c0, expected=0, futex_word=0x7fc91d7f95a8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc91d7f9460, mutex=0x7fc91d7f9558, cond=0x7fc91d7f9580) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc91d7f9580, mutex=0x7fc91d7f9558, abstime=0x7fc91d7f9460) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b1d370 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b5e204 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7fc91dffb700 (LWP 26930)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc91dffa3c0, expected=0, futex_word=0x7fc91dffa5a8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc91dffa460, mutex=0x7fc91dffa558, cond=0x7fc91dffa580) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc91dffa580, mutex=0x7fc91dffa558, abstime=0x7fc91dffa460) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b1d370 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b5e204 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7fc91e7fc700 (LWP 26929)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x55d918db8708) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d918db8648, cond=0x55d918db86e0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x55d918db86e0, mutex=0x55d918db8648) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc9934ae7d8 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b60d86 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7fc91effd700 (LWP 26928)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc91effc5f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc91effc5a8, cond=0x7fc91effc5d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc91effc5d0, mutex=0x7fc91effc5a8) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f998 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50e61 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7fc91f7fe700 (LWP 26927)):
#0  0x00007fc99b6b3537 in __GI___libc_write (nbytes=39, buf=0x7fc91f7fa520, fd=2) at ../sysdeps/unix/sysv/linux/write.c:26
#1  0x00007fc99b6b3537 in __GI___libc_write (fd=2, buf=0x7fc91f7fa520, nbytes=39) at ../sysdeps/unix/sysv/linux/write.c:24
#2  0x00007fc99b6443bd in _IO_new_file_write (f=0x7fc99b785680 <_IO_2_1_stderr_>, data=0x7fc91f7fa520, n=39) at fileops.c:1183
#3  0x00007fc99b64375f in new_do_write (fp=fp@entry=0x7fc99b785680 <_IO_2_1_stderr_>, data=data@entry=0x7fc91f7fa520 "[warn] epoll_wait: Bad file descriptor\n", to_do=to_do@entry=39) at libioP.h:839
#4  0x00007fc99b644aee in _IO_new_file_xsputn (n=39, data=<optimized out>, f=0x7fc99b785680 <_IO_2_1_stderr_>) at fileops.c:1262
#5  0x00007fc99b644aee in _IO_new_file_xsputn (f=0x7fc99b785680 <_IO_2_1_stderr_>, data=<optimized out>, n=39) at fileops.c:1204
#6  0x00007fc99b61b932 in buffered_vfprintf (s=s@entry=0x7fc99b785680 <_IO_2_1_stderr_>, format=format@entry=0x7fc98dce4848 "[%s] %s\n", args=args@entry=0x7fc91f7fcae0) at ../libio/libioP.h:839
#7  0x00007fc99b618eb2 in _IO_vfprintf_internal (s=s@entry=0x7fc99b785680 <_IO_2_1_stderr_>, format=0x7fc98dce4848 "[%s] %s\n", ap=ap@entry=0x7fc91f7fcae0) at vfprintf.c:1296
#8  0x00007fc99b6d1536 in ___fprintf_chk (fp=0x7fc99b785680 <_IO_2_1_stderr_>, flag=1, format=<optimized out>) at fprintf_chk.c:35
#9  0x00007fc98dccca5a in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#10 0x00007fc98dcccc34 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#11 0x00007fc98dcce588 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#12 0x00007fc98dcc4329 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#13 0x00007fc992b1d779 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007fc991c4ddba in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007fc991c4e267 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007fc992b5e338 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#18 0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#19 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#20 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7fc91ffff700 (LWP 26926)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc91fffe5f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc91fffe5a8, cond=0x7fc91fffe5d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc91fffe5d0, mutex=0x7fc91fffe5a8) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f998 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7fc93cff9700 (LWP 26925)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc93cff85f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc93cff85a8, cond=0x7fc93cff85d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc93cff85d0, mutex=0x7fc93cff85a8) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f998 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50e61 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7fc93d7fa700 (LWP 26924)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc93d7f95f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc93d7f95a8, cond=0x7fc93d7f95d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc93d7f95d0, mutex=0x7fc93d7f95a8) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f998 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7fc93dffb700 (LWP 26923)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc93dffa5f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc93dffa5a8, cond=0x7fc93dffa5d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc93dffa5d0, mutex=0x7fc93dffa5a8) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f998 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7fc93e7fc700 (LWP 26922)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc93e7fb5f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc93e7fb5a8, cond=0x7fc93e7fb5d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc93e7fb5d0, mutex=0x7fc93e7fb5a8) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f998 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7fc93effd700 (LWP 26921)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc93effc400, expected=0, futex_word=0x7fc93effc5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc93effc4a0, mutex=0x7fc93effc598, cond=0x7fc93effc5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc93effc5c0, mutex=0x7fc93effc598, abstime=0x7fc93effc4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50e61 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fc93f7fe700 (LWP 26920)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc93f7fd400, expected=0, futex_word=0x7fc93f7fd5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc93f7fd4a0, mutex=0x7fc93f7fd598, cond=0x7fc93f7fd5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc93f7fd5c0, mutex=0x7fc93f7fd598, abstime=0x7fc93f7fd4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50e61 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fc93ffff700 (LWP 26919)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc93fffe400, expected=0, futex_word=0x7fc93fffe5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc93fffe4a0, mutex=0x7fc93fffe598, cond=0x7fc93fffe5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc93fffe5c0, mutex=0x7fc93fffe598, abstime=0x7fc93fffe4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50e61 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fc94cdeb700 (LWP 26918)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc94cdea400, expected=0, futex_word=0x7fc94cdea5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc94cdea4a0, mutex=0x7fc94cdea598, cond=0x7fc94cdea5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc94cdea5c0, mutex=0x7fc94cdea598, abstime=0x7fc94cdea4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50e61 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fc94d5ec700 (LWP 26917)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc94d5eb400, expected=0, futex_word=0x7fc94d5eb5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc94d5eb4a0, mutex=0x7fc94d5eb598, cond=0x7fc94d5eb5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc94d5eb5c0, mutex=0x7fc94d5eb598, abstime=0x7fc94d5eb4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fc94dded700 (LWP 26916)):
#0  0x00007fc9990fe3f9 in futex_reltimed_wait_cancelable (private=0, reltime=0x7fc94ddec400, expected=0, futex_word=0x7fc94ddec5e8) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fc9990fe3f9 in __pthread_cond_wait_common (abstime=0x7fc94ddec4a0, mutex=0x7fc94ddec598, cond=0x7fc94ddec5c0) at pthread_cond_wait.c:533
#2  0x00007fc9990fe3f9 in __pthread_cond_timedwait (cond=0x7fc94ddec5c0, mutex=0x7fc94ddec598, abstime=0x7fc94ddec4a0) at pthread_cond_wait.c:667
#3  0x00007fc992b48a37 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b30a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3f2 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b4f981 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b50c7f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fc94e5ee700 (LWP 26915)):
#0  0x00007fc99b6cf71b in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:63
#1  0x00007fc99b6d14e4 in ___fprintf_chk (fp=0x7fc99b7868b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fc98dce4848 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fc98dccca5a in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007fc98dcccc34 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007fc98dcce588 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007fc98dcc4329 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007fc992b1d779 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b5e204 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fc94edef700 (LWP 26914)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x7fc94edee588) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fc94edee538, cond=0x7fc94edee560) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x7fc94edee560, mutex=0x7fc94edee538) at pthread_cond_wait.c:655
#3  0x00007fc992b48969 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007fc992b4b318 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007fc992b4b3af in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc992b1d35f in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b5e204 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fc94f7fe700 (LWP 26913)):
#0  0x00007fc99b6cf71b in __lll_lock_wait_private () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:63
#1  0x00007fc99b6d14e4 in ___fprintf_chk (fp=0x7fc99b7868b0 <_IO_stdfile_2_lock>, flag=1, format=0x7fc98dce4848 "[%s] %s\n") at fprintf_chk.c:30
#2  0x00007fc98dccca5a in event_logv_ () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007fc98dcccc34 in event_warn () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#4  0x00007fc98dcce588 in  () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#5  0x00007fc98dcc4329 in event_base_loop () at /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6
#6  0x00007fc992b1d779 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc992b3cc8b in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc992b5e204 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc992b59c81 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fc96adee700 (LWP 26899)):
#0  0x00007fc99b6b3494 in __GI___libc_read (nbytes=16, buf=0x7fc96aded480, fd=8) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fc99b6b3494 in __GI___libc_read (fd=8, buf=0x7fc96aded480, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007fc9985b8aa0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc998572c0f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc9985730e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc99857325c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fc99bbc987b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc99bb7727b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc99b9c6ec6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc99b9d0aa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fc96bfff700 (LWP 26896)):
#0  0x00007fc99b6b3494 in __GI___libc_read (nbytes=16, buf=0x7fc96bffe450, fd=6) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fc99b6b3494 in __GI___libc_read (fd=6, buf=0x7fc96bffe450, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007fc9985b8aa0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc998572c0f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc9985730e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc99857325c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fc99bbc987b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc99bb7727b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc99b9c6ec6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc99b19c545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007fc99b9d0aa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#12 0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fc98082b700 (LWP 26895)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x55d9187eb85c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d9187eb808, cond=0x55d9187eb830) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x55d9187eb830, mutex=0x55d9187eb808) at pthread_cond_wait.c:655
#3  0x00007fc98225828c in cnd_wait (cond=0x55d9187eb830, mtx=0x55d9187eb808) at ../include/c11/threads_posix.h:155
#4  0x00007fc982258763 in pipe_semaphore_wait (sema=0x55d9187eb808) at ../src/gallium/auxiliary/os/os_thread.h:108
#5  0x00007fc982259ef9 in thread_function (init_data=0x55d9187eb768) at ../src/gallium/drivers/llvmpipe/lp_rast.c:805
#6  0x00007fc9822581f1 in impl_thrd_routine (p=0x55d9187e89c0) at ../include/c11/threads_posix.h:87
#7  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fc98102c700 (LWP 26894)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x55d9187eb6fc) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d9187eb6a8, cond=0x55d9187eb6d0) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x55d9187eb6d0, mutex=0x55d9187eb6a8) at pthread_cond_wait.c:655
#3  0x00007fc98225828c in cnd_wait (cond=0x55d9187eb6d0, mtx=0x55d9187eb6a8) at ../include/c11/threads_posix.h:155
#4  0x00007fc982258763 in pipe_semaphore_wait (sema=0x55d9187eb6a8) at ../src/gallium/auxiliary/os/os_thread.h:108
#5  0x00007fc982259ef9 in thread_function (init_data=0x55d9187eb608) at ../src/gallium/drivers/llvmpipe/lp_rast.c:805
#6  0x00007fc9822581f1 in impl_thrd_routine (p=0x55d9187e8700) at ../include/c11/threads_posix.h:87
#7  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fc98182d700 (LWP 26893)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x55d9187eb598) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d9187eb548, cond=0x55d9187eb570) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x55d9187eb570, mutex=0x55d9187eb548) at pthread_cond_wait.c:655
#3  0x00007fc98225828c in cnd_wait (cond=0x55d9187eb570, mtx=0x55d9187eb548) at ../include/c11/threads_posix.h:155
#4  0x00007fc982258763 in pipe_semaphore_wait (sema=0x55d9187eb548) at ../src/gallium/auxiliary/os/os_thread.h:108
#5  0x00007fc982259ef9 in thread_function (init_data=0x55d9187eb4a8) at ../src/gallium/drivers/llvmpipe/lp_rast.c:805
#6  0x00007fc9822581f1 in impl_thrd_routine (p=0x55d9187e8440) at ../include/c11/threads_posix.h:87
#7  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fc98202e700 (LWP 26892)):
#0  0x00007fc9990fe00c in futex_wait_cancelable (private=0, expected=0, futex_word=0x55d9187eb43c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fc9990fe00c in __pthread_cond_wait_common (abstime=0x0, mutex=0x55d9187eb3e8, cond=0x55d9187eb410) at pthread_cond_wait.c:502
#2  0x00007fc9990fe00c in __pthread_cond_wait (cond=0x55d9187eb410, mutex=0x55d9187eb3e8) at pthread_cond_wait.c:655
#3  0x00007fc98225828c in cnd_wait (cond=0x55d9187eb410, mtx=0x55d9187eb3e8) at ../include/c11/threads_posix.h:155
#4  0x00007fc982258763 in pipe_semaphore_wait (sema=0x55d9187eb3e8) at ../src/gallium/auxiliary/os/os_thread.h:108
#5  0x00007fc982259ef9 in thread_function (init_data=0x55d9187eb348) at ../src/gallium/drivers/llvmpipe/lp_rast.c:805
#6  0x00007fc9822581f1 in impl_thrd_routine (p=0x55d9187e8180) at ../include/c11/threads_posix.h:87
#7  0x00007fc9990f7fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fc99b6c24cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc984c20f00 (LWP 26890)):
[KCrash Handler]
#4  0x0000000000000021 in  ()
#5  0x00007fc991f42d95 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007fc9917402a5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007fc993386cbd in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007fc9933bf959 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007fc9933bf43e in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007fc992af9688 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#11 0x00007fc992b1a10a in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#12 0x00007fc992b1abaf in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#13 0x00007fc992b1ad48 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#14 0x00007fc9915932c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#15 0x00007fc9915933e5 in  () at /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007fc99bb7a6ca in qt_call_post_routines() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fc99c4f3b66 in QApplication::~QApplication() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x000055d917ca82de in KMailApplication::~KMailApplication() (this=0x7ffd1a175a50, __in_chrg=<optimized out>) at ./src/main.cpp:42
#19 0x000055d917ca7412 in main(int, char**) (argc=1, argv=0x7ffd1a175c68) at ./src/main.cpp:127
[Inferior 1 (process 26890) detached]

Report to https://bugs.kde.org/
Comment 1 Olivier Churlaud 2019-11-05 19:30:19 UTC 
Found a link to this bug from Planet Debian.

Not reproduced with following configuration

kmail 5.12.2
KDE Frameworks 5.63.0
Qt 5.13.2
xcb Window System
Distribution: Arch Linux
OS: Linux  5.3.8-arch1-1 #1 SMP PREEMPT @1572357769 x86_64 GNU/Linux