[Bug 253237] sys/netgraph/ng_macfilter_test:main test panics on RISC-V QEMU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253237

            Bug ID: 253237
           Summary: sys/netgraph/ng_macfilter_test:main test panics on
                    RISC-V QEMU
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: arichardson at FreeBSD.org

Running `cd /usr/tests/ && kyua test` on RISC-V built today (commit
65618fdda0f272a823e6701966421bdca0efa301) results in the following panic:

sys/netgraph/ng_macfilter_test:main  ->  WARNING: attempt to
domain_add(netgraph) after domainfinalize()
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex ng_node (ng_node) r = 0 (0xffffffd002139c70) locked @
/local/scratch/alr48/cheri/freebsd/sys/netgraph/ng_base.c:2325
stack backtrace:
#0 0xffffffc00031de5a at witness_checkorder+0xe78
#1 0xffffffc00031ef58 at witness_warn+0x3f4
#2 0xffffffc00054619a at do_trap_supervisor+0x3a8
#3 0xffffffc000545e56 at do_trap_supervisor+0x64
#4 0xffffffc000536718 at cpu_exception_handler_supervisor+0x68
t[0] == 0xffffffd07fd97280
t[1] == 0xffffffc0a5552b6c
t[2] == 0xffffffc0a4d6b1d0
t[3] == 0xffffffc0002999de
t[4] == 0x0000000000000000
t[5] == 0xffffffc0a60c52b0
t[6] == 0x0000000000000001
s[0] == 0x0000000000000000
s[1] == 0xffffffd002139c88
s[2] == 0xffffffd002139c00
s[3] == 0x0000000000001000
s[4] == 0xffffffd002139c68
s[5] == 0x00000000ffffffff
s[6] == 0xffffffd002139c00
s[7] == 0x0000000000000001
s[8] == 0x0000000000004f68
s[9] == 0xffffffd0268a03b0
s[10] == 0xffffffd001448cf0
s[11] == 0x0000000000000000
a[0] == 0x0000000000000002
a[1] == 0x0000000000000000
a[2] == 0x0000000000000000
a[3] == 0x0000000000100000
a[4] == 0x0000000000000000
a[5] == 0xffffffc0007d0f68
a[6] == 0xffffffd07fd8d380
a[7] == 0x0000000000000027
ra == 0xffffffc0a554df30
sp == 0xffffffc0a60c5870
gp == 0x0000000000000000
tp == 0xffffffd026ddf980
sepc == 0xffffffc0a554df3e
sstatus == 0x8000000200006120
panic: Fatal page fault at 0xffffffc0a554df3e: 0000000000000000
cpuid = 0
time = 1612390054
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_fetch_ksymtab() at db_fetch_ksymtab+0x15c
kdb_backtrace() at kdb_backtrace+0x2c
vpanic() at vpanic+0x148
panic() at panic+0x26
do_trap_supervisor() at do_trap_supervisor+0x500
do_trap_supervisor() at do_trap_supervisor+0x64
cpu_exception_handler_supervisor() at cpu_exception_handler_supervisor+0x68
--- exception 13, tval = 0
KDB: enter: panic
[ thread pid 90029 tid 103721 ]
Stopped at      kdb_enter+0x44: sd      zero,0(a0)
db>

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