FreeBSD-main-amd64-test - Build #21861 - Still Unstable

FreeBSD-main-amd64-test - Build #21861 (fa2d4a22fa82665a778e2f700e3318efebf2d87f) - Still Unstable

Build information: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/21861/
Full change log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/21861/changes
Full build log: https://ci.FreeBSD.org/job/FreeBSD-main-amd64-test/21861/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)

795a9974144ec26f93a9081f72e09a2814ac3e4c by whu:
Hyper-V: storvsc: Call bus_dmamap_sync() for dma operations

fa2d4a22fa82665a778e2f700e3318efebf2d87f by whu:
mana: add rmb load fence to comply with hw spec



The failed test cases:

1 tests failed.
FAILED:  lib.libc.locale.c16rtomb_test.c16rtomb_utf_8_test

Error Message:
/usr/src/lib/libc/tests/locale/c16rtomb_test.c:145: c16rtomb(buf, L'A', &s) == (size_t)-1 not met