misc/57291: Unit test for lib/libc/regex/t_exhaust fails in ATF Tests suite with signal 9

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>Number:         57291
>Category:       misc
>Synopsis:       Unit test for lib/libc/regex/t_exhaust fails in ATF Tests suite with signal 9
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 24 22:00:01 +0000 2023
>Originator:     Jim Spath
>Release:        10.0_BETA
>Organization:
>Environment:
NetBSD pi.r.zero 10.0_BETA NetBSD 10.0_BETA (GENERIC) #0: Fri Jan 13 19:15:32 UTC 2023  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/GENERIC evbarm

>Description:
Ran tests under /usr/tests and found a failure, limited to Raspberry Pi Zero 2W systems.

$ atf-run lib/libc/regex/t_exhaust
Content-Type: application/X-atf-tps; version="3"

info: atf.version, Automated Testing Framework 0.20 (atf-0.20)
info: tests.root, /usr/tests
info: time.start, Fri Mar 24 21:35:01 UTC 2023
[...]
tps-count: 1
tp-start: 1679693702.112045, lib/libc/regex/t_exhaust, 1
tc-start: 1679693702.112338, regcomp_too_big
tc-end: 1679693715.914422, regcomp_too_big, failed, Test program received signal 9
tp-end: 1679693715.922852, lib/libc/regex/t_exhaust
info: time.end, Fri Mar 24 21:35:15 UTC 2023

>How-To-Repeat:
The error occurs on 2 installations of the evbarm image.

$ file lib/libc/regex/t_exhaust
lib/libc/regex/t_exhaust: ELF 32-bit LSB pie executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /usr/libexec/ld.elf_so, for NetBSD 10.0, compiled for: earmv7hf, not stripped

>Fix:
Unknown.