FreeBSD-main-amd64-test - Build #28096 - Still Unstable

FreeBSD-main-amd64-test - Build #28096 (82a066b8593a14e0bbf8e1fcdc75fd9ecf0d9e62) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/28096/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/28096/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/28096/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)

cbac897a7b057427cfaab12cc143144eadd1e80d by pouria:
in6_mcast: Acquire ref to ifp and exit epoch earlier in sysctl

82a066b8593a14e0bbf8e1fcdc75fd9ecf0d9e62 by christos:
snd_dummy: Fix sys/conf/files entry



The failed test cases:

2 tests failed.
FAILED:  sys.kern.timerfd.timerfd__periodic_timer_performance

Error Message:
/usr/src/tests/sys/kern/timerfd.c:742: 344727864

FAILED:  sbin.savecore.livedump_test.livedump_kldstat

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