[Bug 259157] Test case sys.netgraph.hub.loop panics RISC-V kernel

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 13 Oct 2021 21:20:43 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259157

            Bug ID: 259157
           Summary: Test case sys.netgraph.hub.loop panics RISC-V kernel
           Product: Base System
           Version: CURRENT
          Hardware: riscv
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: testing@FreeBSD.org
          Reporter: lwhsu@FreeBSD.org

https://ci.freebsd.org/job/FreeBSD-main-riscv64-test/14988/consoleFull

sys/netgraph/hub:loop  ->  panic: vm_fault_lookup: fault on nofault entry,
addr: 0xffffffc0afd93000
cpuid = 0
time = 1633913993
KDB: stack backtrace:
db_trace_self() at db_trace_self
KDB: enter: panic
[ thread pid 42865 tid 100055 ]
Stopped at      kdb_enter+0x4c: sd      zero,0(a0)db:0:kdb.enter.panic> show
pcpu
cpuid        = 0
dynamic pcpu = 0x2b6a80
curthread    = 0xffffffc0afe37680: pid 42865 tid 100055 critnest 1 "hub"
curpcb       = 0xffffffc0afd97d68
fpcurthread  = none
idlethread   = 0xffffffc001c1eb80: tid 100003 "idle: cpu0"
curvnet      = 0xffffffd00105fd00
spin locks held:

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