FreeBSD-stable-15-amd64-test - Build #423 - Still Unstable

FreeBSD-stable-15-amd64-test - Build #423 (18b92d66eda5618f7328e8bd9462b868b2328a20) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/423/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/423/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-stable-15-amd64-test/423/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)

4d95227f637e746ca2f59068d9a810ca89c41e94 by tuexen:
vtnet: define flags in a consistent way

baa28f50d1c5412a8cf47e4117252238fe551863 by tuexen:
vtnet: expose flags via sysctl tree

14cf01b120c95006c937cfbb649f99a1ddd73f3d by tuexen:
vtnet.4: put each sentence on its own line

18b92d66eda5618f7328e8bd9462b868b2328a20 by tuexen:
printf.9: fix style



The failed test cases:

2 tests failed.
FAILED:  sys.netinet6.ndp.ndp_del_gu_success

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

FAILED:  sys.netlink.test_netlink_message_writer.py.__test_cases_list__

Error Message:
Test program did not exit cleanly