[Bug 258815] Boot panics when KMSAN enabled after 6687410af7d..d3a8f98acbf

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258815

            Bug ID: 258815
           Summary: Boot panics when KMSAN enabled after
                    6687410af7d..d3a8f98acbf
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: lwhsu@FreeBSD.org

Created attachment 228294
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228294&action=edit
verbose boot message

After 6687410af7d..d3a8f98acbf , kernel with KMSAN enabled panics on boot.

https://ci.freebsd.org/job/FreeBSD-main-amd64-KMSAN_test/55/console

panic: MSan: Uninitialized malloc memory from g_read_data+0x26f
cpuid = 1
time = 2
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x9b/frame 0xfffffe000779a600
vpanic() at vpanic+0x567/frame 0xfffffe000779a6a0
panic() at panic+0x1b3/frame 0xfffffe000779a7b0
__msan_warning() at __msan_warning+0x255/frame 0xfffffe000779a900
readsuper() at readsuper+0x5f6/frame 0xfffffe000779a9b0
ffs_sbget() at ffs_sbget+0x2c7/frame 0xfffffe000779aac0
g_label_ufs_taste_common() at g_label_ufs_taste_common+0x1e8/frame
0xfffffe000779abe0
g_label_taste() at g_label_taste+0x5ed/frame 0xfffffe000779ad60
g_new_provider_event() at g_new_provider_event+0x5c4/frame 0xfffffe000779ade0
g_run_events() at g_run_events+0x6d3/frame 0xfffffe000779aea0
fork_exit() at fork_exit+0x1c9/frame 0xfffffe000779af30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe000779af30
--- trap 0x800001, rip = 0, rsp = 0, rbp = 0xfffffe0000000000 ---
??() at 0/frame 0xfffffe0000000000
KDB: enter: panic
[ thread pid 13 tid 100037 ]
Stopped at      kdb_enter+0x15f:        movq    $0x863a5890,%rdi
db>

The commits included in this build are:
base d3a8f98acbf51e728411f10c5f179a30b9ca683c                                   
base 0a35c4b3cab563e3ab1bf5b7b49bf26e0bb7cb04                                   
base 242923eb848a94d657344c2ff45c4f15433cdf3c

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