[Bug 289236] sys/kern/exterr_test:gettext_extended testcase fails on arm64 in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289236

            Bug ID: 289236
           Summary: sys/kern/exterr_test:gettext_extended testcase fails
                    on arm64 in CI
           Product: Base System
           Version: CURRENT
          Hardware: arm64
               URL: https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarc
                    h64-test/1756/testReport/sys.kern/exterr_test/gettext_
                    extended/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: asomers@FreeBSD.org
          Reporter: me@svmhdvn.name
                CC: testing@FreeBSD.org

Created attachment 263384
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=263384&action=edit
kyua test report

The 'sys/kern/exterr_test:gettext_extended' testcase fails on arm64 with the
following message:


Standard output:
Extended error: errno 45 category 1 (src line 205) p1 0 p2 0

Standard error:
*** Check failed:
/usr/home/siva/src/fbsdsrcgit/tests/sys/kern/exterr_test.c:54: strstr(exterr,
"prot is not subset of max_prot") != 0 not met


This failure is also visible in CI here:
https://ci.freebsd.org/view/Test/job/FreeBSD-main-aarch64-test/1756/testReport/sys.kern/exterr_test/gettext_extended/

I have reproduced this error using Bricoler with 100 runs for good measure:

$ bricoler run freebsd-src-regression-suite --param freebsd-src:url=/usr/src
--param freebsd-src:branch= --param
freebsd-src-regression-suite:hypervisor=bhyve --param
freebsd-src-regression-suite:memory=4096 --param
freebsd-src-regression-suite:ncpus=2 --param
freebsd-src-regression-suite:parallelism=1 --param
freebsd-src-regression-suite:count=100 --param
freebsd-src-regression-suite:tests='sys/kern/exterr_test:gettext_extended'

@asomers I see that you have written the tests in
https://cgit.freebsd.org/src/commit/?id=874385b03f8d75111b98a6d6c0fbfb5ac5b29ace
(uexterr_gettext: add tests). Please triage as necessary.

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