FreeBSD-main-amd64-test - Build #20858 - Unstable

FreeBSD-main-amd64-test - Build #20858 (0134bbe56fbbf3a53a6eeefeb21c66a998654a29) - Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/20858/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/20858/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/20858/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)

02fc4e319c86bce7c7661daffb3705b0680e9ed2 by mjg:
cache: use flexible array member

0134bbe56fbbf3a53a6eeefeb21c66a998654a29 by mjg:
vfs: prefix lookup and relookup with vfs_



The failed test cases:

1 tests failed.
FAILED:  sys.kern.ptrace_test.ptrace__follow_fork_both_attached_unrelated_debugger

Error Message:
/usr/src/tests/sys/kern/ptrace_test.c:603: WIFSTOPPED(status) not met