FreeBSD-main-amd64-test - Build #22771 - Still unstable

FreeBSD-main-amd64-test - Build #22771 (48dc9150ac3686d4cbf1dc4be08e1c4d42b44336) - Still unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/22771/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/22771/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/22771/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)

48dc9150ac3686d4cbf1dc4be08e1c4d42b44336 by pho:
stress2: Added finding to unionfs9.sh and updated the exclude list



The failed test cases:

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

Error Message:
/usr/src/tests/sys/kern/ptrace_test.c:594: WIFSTOPPED(status) not met

FAILED:  sys.net.if_tun_test.235704

Error Message:
atf-check failed; see the output of the test for details

FAILED:  usr.sbin.etcupdate.preworld_test.main

Error Message:
Returned non-success exit status 1

FAILED:  sys.aio.aio_test.aio_socket_blocking_short_write

Error Message:
Test case body timed out

FAILED:  sys.aio.aio_test.aio_socket_blocking_short_write_vectored

Error Message:
Test case body timed out

FAILED:  sys.aio.aio_test.aio_socket_short_write_cancel

Error Message:
/usr/src/tests/sys/aio/aio_test.c:1396: aio_error(&iocb) == EINPROGRESS not met