FreeBSD-main-amd64-test - Build #27999 - Still Unstable

FreeBSD-main-amd64-test - Build #27999 (9c9f27e8af285d778a312be2f8002c4404c1e77d) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/27999/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/27999/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/27999/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)

cc325dd8c469265cf9c40616c8087b0ee98a6005 by des:
Import tzcode 2025a

76d3e9d6b36023210e896d00ecef2d19f0acd2d8 by des:
Import tzcode 2025b

2a4e3112c811b9892e14e15cfd23538e7e47329c by fuz:
libc/riscv64: temporarily disable strnlen() implementation until a fix

b5514e1c6d9e7ec09b299a983d1ce32852e0d9dc by fuz:
depend-cleanup.sh: rebuild strnlen.o on riscv64 if it came from

3a410851bf02c247e71bcd06fdeec2706c6b6070 by christos:
virtual_oss: Use virtual_oss_delay_ns() to avoid duplication

e75c8faf277dded0a80d469cb8182583716a2211 by christos:
virtual_oss: Use virtual_oss_timestamp() to avoid duplication

756500fa4b1ed0807e16c9063f27031544cd7706 by imp:
kern.post.mk: Replace "mkdir -p" with "install -d"



The failed test cases:

1 tests failed.
FAILED:  sys.netinet6.frag6.frag6_07.frag6_07

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