FreeBSD-main-amd64-test - Build #29420 - Still Unstable

FreeBSD-main-amd64-test - Build #29420 (c5d9485e7d7faeba1019301ed83a781dac2d0cb0) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/29420/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/29420/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/29420/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)

c5d9485e7d7faeba1019301ed83a781dac2d0cb0 by pkubaj:
umtx: do not sleep on an unowned mutex after a spurious CAS failure



The failed test cases:

2 tests failed.
FAILED:  sys.netpfil.pf.pfsync.bulk

Error Message:
state not found on synced host

FAILED:  sys.netlink.netlink_socket.overflow

Error Message:
/usr/src/tests/sys/netlink/netlink_socket.c:146: send(fd, &hdr, sizeof(hdr), 0) == sizeof(hdr) not met