[Bug 281978] g_io_request panic on md(4) with odd size

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281978

            Bug ID: 281978
           Summary: g_io_request panic on md(4) with odd size
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bz@FreeBSD.org

I have in the past done this but after a recent update it panics on boot with a
DEBUG kernel:

I am pre-loading an md(4)image file from loader which has an odd size (md0 is a
root image which seems fine if I disable the md1):

md1: Preloaded image </bazrandom> 61281 bytes at 0xffff000005f95eb0

This leads to a panic when geom tries to taste but doesn't find a file system
or disk-sized image:

panic: wrong offset 60769 for sectorsize 512
cpuid = 0
time = 1
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x58
vpanic() at vpanic+0x220
panic() at panic+0x48
g_io_request() at g_io_request+0x5e4
g_read_data() at g_read_data+0xc8
g_label_generic_taste() at g_label_generic_taste+0x90
g_label_taste() at g_label_taste+0x268
g_load_class() at g_load_class+0x23c
g_run_events() at g_run_events+0x13c
fork_exit() at fork_exit+0x98
fork_trampoline() at fork_trampoline+0x18
KDB: enter: panic
[ thread pid 14 tid 100075 ]
Stopped at      kdb_enter+0x78: str     xzr, [x21, #2048]

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