Description of problem:
SSIA

Version-Release number of selected component (if applicable):
FAIL: xlockmore-5.61-2.fc32.x86_64
PASS: xlockmore-5.64-1.fc33.x86_64

How reproducible:
Always.

Steps to Reproduce:
xlock -startCmd true 

Actual results:
Jun 30 18:39:38 host2 xlock[114113]: Start: lace, lace, :0
Jun 30 18:39:38 host2 kernel: xlock[114118]: segfault at 7f99f3af49d0 ip 00007f9a02eba872 sp 00007ffcd2807b00 error 4 in libpthread-2.31.so[7f9a02eb7000+10000]
Jun 30 18:39:38 host2 kernel: Code: 54 24 f8 c3 0f 1f 40 00 f3 0f 1e fa 41 57 41 56 41 55 41 54 55 53 48 83 ec 68 64 48 8b 04 25 28 00 00 00 48 89 44 24 58 31 c0 <8b> 87 d0 02 00 00 85 c0 0f 88 30 02 00 00 49 89 ff 48 39 bf 28 06
Jun 30 18:39:43 host2 xlock[114113]: Stop: lace, lace, :0, 0m 5s

Expected results:
Jun 30 18:39:52 host2 xlock[114132]: Start: lace, lace, :0
Jun 30 18:39:55 host2 xlock[114132]: Stop: lace, lace, :0, 0m 3s

Additional info:
The command itself does not SEGV, it forks a child which does SEGV.

(gdb) bt
#0  __pthread_clockjoin_ex (threadid=140073336301312, thread_return=thread_return@entry=0x7fffdb89bac0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, block=block@entry=true)
    at pthread_join_common.c:89
#1  0x00007f6564b047c3 in __pthread_join (threadid=<optimized out>, thread_return=thread_return@entry=0x7fffdb89bac0) at pthread_join.c:24
#2  0x00007f656334ce77 in thrd_join (res=0x0, thr=<optimized out>) at ../include/c11/threads_posix.h:329
#3  util_queue_kill_threads (finish_locked=false, keep_num_threads=<optimized out>, queue=0x1b9d540) at ../src/util/u_queue.c:496
#4  util_queue_kill_threads (queue=0x1b9d540, keep_num_threads=<optimized out>, finish_locked=<optimized out>) at ../src/util/u_queue.c:472
#5  0x00007f656334cf2c in atexit_handler () at ../src/util/u_queue.c:62
#6  0x00007f656496f3d7 in __run_exit_handlers (status=0, listp=0x7f6564af3578 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true)
    at exit.c:108
#7  0x00007f656496f580 in __GI_exit (status=<optimized out>) at exit.c:139
#8  0x000000000040be54 in ?? ()
#9  0x0000000000000001 in ?? ()
#10 0x0000000000000000 in ?? ()
(gdb) frame 5
#5  0x00007f656334cf2c in atexit_handler () at ../src/util/u_queue.c:62
62	      util_queue_kill_threads(iter, 0, false);
(gdb) info source
Current source file is ../src/util/u_queue.c
Compilation directory is /usr/src/debug/mesa-20.1.2-1.fc32.x86_64/x86_64-redhat-linux-gnu
Located in /usr/src/debug/mesa-20.1.2-1.fc32.x86_64/src/util/u_queue.c
Contains 685 lines.
Source language is c.
Producer is GNU C99 10.1.1 20200507 (Red Hat 10.1.1-1) -m64 -mtune=generic -march=x86-64 -g -O2 -std=c99 -fno-math-errno -fno-trapping-math -fexceptions -fstack-protector-strong -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection=full -fcommon -fPIC -fvisibility=hidden -fplugin=annobin.
Compiled with DWARF 2 debugging format.
Does not include preprocessor macro info.

I did not investigate it more when a newer version has it fixed.