FreeBSD-stable-15-amd64-test - Build #1269 - Still Unstable

FreeBSD-stable-15-amd64-test - Build #1269 (77fa63fa43fc8df1cfb86476b9caff24d10de6bc) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/1269/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/1269/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/1269/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)

77fa63fa43fc8df1cfb86476b9caff24d10de6bc by alc:
arm64 pmap: demote L3C pages in pmap_clear_modify()



The failed test cases:

6 tests failed.
FAILED:  sys.netpfil.pf.return.py.TestReturn::test_tcp

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

FAILED:  sys.netlink.netlink_socket.overflow

Error Message:
/usr/src/tests/sys/netlink/netlink_socket.c:142: send(fd, &hdr, sizeof(hdr), 0) == sizeof(hdr) not met

FAILED:  sys.netpfil.pf.unmapped_mbuf.dummynet

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

FAILED:  sys.netpfil.pf.unmapped_mbuf.v4

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

FAILED:  sys.netpfil.pf.unmapped_mbuf.v6

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

FAILED:  lib.libexecinfo.sigtramp_test.test_backtrace_sigtramp

Error Message:
/usr/src/lib/libexecinfo/tests/sigtramp_test.c:30: n > 1 not met