FreeBSD-main-amd64-test - Build #24656 - Still Unstable

FreeBSD-main-amd64-test - Build #24656 (d682a91726d72eaf7ba8dddeb4d9ce161ab8b93a) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/24656/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/24656/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/24656/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)

1f62718d8ba26d813d8c2e826ac5f4caee4c6730 by markj:
top: Avoid printing a blank line when the ZFS ARC is empty

b068bb09a1a82d9fef0e939ad6135443a959e290 by kib:
Add vnode_pager_clean_{a,}sync(9)

6597ea4481bb29b6ac72b9c55038b1e98634bf92 by brooks:
powerpc/SYS.h: implement _SYSCALL_BODY() macro

e2417a21a02562655d760005e9827f1190bb652f by brooks:
libc: separate syscall and non-syscall symbols

d682a91726d72eaf7ba8dddeb4d9ce161ab8b93a by markj:
conf: Do not set -fno-sanitize-memory-param-retval for old compilers



The failed test cases:

1 tests failed.
FAILED:  sys.kern.unix_passfd_dgram.send_and_shutdown

Error Message:
/usr/src/tests/sys/kern/unix_passfd_test.c:431: openfiles() == nfiles - 1 not met