FreeBSD-main-amd64-test - Build #24269 - Still Unstable

FreeBSD-main-amd64-test - Build #24269 (22dc8609c565456fda3de6ddc34e07af98f11203) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/24269/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/24269/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/24269/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)

7123222220aa563dc16bf1989d335722e4ff57a6 by markj:
witness: Unconditionally initialize out-params for witness_save()

e5caed14067b40f1454d74e99789a28508d0eea3 by markj:
kmsan: Use __builtin_memset to initialize per-thread state

b6c653c9746342b373af01979319b3cb123b2872 by markj:
kmsan: Set -fno-sanitize-memory-param-retval for now

a37e484d049758c70f2d61be0d28a115b6f2f01e by markj:
amd64: Zero-fill AP PCPU pages

761ae1ce798add862d78728cc5ac5240ce7db779 by markj:
ktrace: Handle uio_resid underflow via MSG_TRUNC

8fd0ec53deaad34383d4b344714b74d67105b258 by markj:
uiomove: Add some assertions

b5e7dbac756afb49c58315c7081737b34a1d2dfd by markj:
socket tests: Clean up the MSG_TRUNC regression tests a bit

d8735eb7acc0613fd19f74a49d3bdcb7ed0e9b0e by markj:
socket tests: Add a regression test for ktrace+recv(MSG_TRUNC)

4a3810075fd307301d8b3f087efe7a61bc37199b by corvink:
bhyve: fix buffer overflow in QemuFwCfg

4bd1e19684945aa1fd3397b58613f5210fda9091 by markj:
socket tests: Build fix

22dc8609c565456fda3de6ddc34e07af98f11203 by rscheff:
tcp: use signed IsLost() related accounting variables



The failed test cases:

3 tests failed.
FAILED:  sys.netinet.arp.arp_add_success

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

FAILED:  sys.netinet6.frag6.frag6_19.frag6_19

Error Message:
Global IPv6 statistics do not match: 19 != 20

FAILED:  sys.fs.tmpfs.times_test.empty

Error Message:
Incorrect atime