FreeBSD-main-amd64-test - Build #19885 - Unstable

FreeBSD-main-amd64-test - Build #19885 (6637b7460066314f9b3ce0073ec6563e15ece608) - Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/19885/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/19885/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/19885/console

Status explanation:
"Unstable" - some tests are suspected being broken by the following changes
"Still Unstable" - the failing test cases have not been fixed by these
                   following changes and this is a notification to note that
                   these changes have not been fully tested by the CI system

Change summaries:
(Those commits are likely but not certainly responsible)

b57e0aa4ef4319334df8018bc60fd28a84b074cc by imp:
arm: Make machine/reg.h self-contained

8ee8271e22975f77f8c147c81470b8eaee3bbab9 by imp:
arm64: Make machine/reg.h self contained

d2bf8c544adc4b080d3ab15d4f08f501b689d964 by imp:
riscv: Make machine/regs.h self-contained

76d6bb6a6e8f61ed267ac245cdf2d293deade8d7 by imp:
powerpc: Make machine/reg.h self-contained

ee2c52fd3fd9dd19c1f7117cdda968ec4e08c898 by imp:
sys/devctl.h: Only declare kernel functions in kernel.

09f1ead2302109abff50277533cc16ebfc406eb0 by imp:
Fix copyright to be like all my others in the tree

6637b7460066314f9b3ce0073ec6563e15ece608 by imp:
cam: Remove all the write-only variables



The failed test cases:

2 tests failed.
FAILED:  lib.libc.regex.exhaust_test.regcomp_too_big

Error Message:
Empty test result or no new line

FAILED:  sys.posixshm.posixshm_test.largepage_mprotect

Error Message:
/usr/src/tests/sys/posixshm/posixshm_test.c:1669: mmap(2097152 bytes) failed; error=28