FreeBSD-stable-15-amd64-test - Build #623 - Unstable

FreeBSD-stable-15-amd64-test - Build #623 (84b871567ebe264222d96655e4f6f92c73b0996e) - Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/623/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/623/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/623/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)

0361497268a51c565ff335f102690dd8ccad4546 by markj:
rtadvd: Fix validation of the MTU parameter when parsing config

2791bc4219e8e5e99e0160ff398b31436e0f04de by markj:
vm_fault: Avoid creating clean, writeable superpage mappings

84b871567ebe264222d96655e4f6f92c73b0996e by markj:
kqueue: Fix a race when adding an fd-based knote to a queue



The failed test cases:

3 tests failed.
FAILED:  sys.kern.pdwait.basic

Error Message:
1 checks failed; see output for more details

FAILED:  sys.kern.ptrace_test.ptrace__follow_fork_parent_detached_unrelated_debugger

Error Message:
/usr/src/tests/sys/kern/ptrace_test.c:591: WIFSTOPPED(status) not met

FAILED:  sys.netpfil.pf.return.py.TestReturn::test_udp

Error Message:
/usr/tests/sys/netpfil/pf/return.py:38: Exception