[Bug 244250] sys.file.flock_test.main panics kernel after [r358153, r358170]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244250

            Bug ID: 244250
           Summary: sys.file.flock_test.main panics kernel after [r358153,
                    r358170]
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: testing at freebsd.org
          Reporter: lwhsu at FreeBSD.org

https://ci.freebsd.org/job/FreeBSD-head-amd64-test/14399/console

sys/file/flock_test:main  ->  Kernel page fault with the following
non-sleepable locks held:
exclusive sleep mutex sigacts (sigacts) r = 0 (0xfffff80004e99ca8) locked @
/usr/src/sys/kern/subr_trap.c:330
exclusive sleep mutex process lock (process lock) r = 0 (0xfffff8000491eb80)
locked @ /usr/src/sys/kern/subr_trap.c:329
stack backtrace:
#0 0xffffffff80c345a1 at witness_debugger+0x71
#1 0xffffffff80c355c0 at witness_warn+0x430
#2 0xffffffff8106cf70 at trap_pfault+0x80
#3 0xffffffff8106c587 at trap+0x2a7
#4 0xffffffff8104288c at calltrap+0x8
#5 0xffffffff80bd0bcb at sigfastblock_setpend+0x4b
#6 0xffffffff80c29ca9 at ast+0x339
#7 0xffffffff81045da9 at doreti_ast+0x1f


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x80069b038
fault code              = supervisor write data, protection violation
instruction pointer     = 0x20:0xffffffff8106a06d
stack pointer           = 0x28:0xfffffe003adfbb80
frame pointer           = 0x28:0xfffffe003adfbb80
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 16434 (flock_helper)
trap number             = 12
panic: page fault
cpuid = 0
time = 1582222637
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe003adfb7e0
vpanic() at vpanic+0x185/frame 0xfffffe003adfb840
panic() at panic+0x43/frame 0xfffffe003adfb8a0
trap_fatal() at trap_fatal+0x386/frame 0xfffffe003adfb900
trap_pfault() at trap_pfault+0x99/frame 0xfffffe003adfb980
trap() at trap+0x2a7/frame 0xfffffe003adfbab0
calltrap() at calltrap+0x8/frame 0xfffffe003adfbab0
--- trap 0xc, rip = 0xffffffff8106a06d, rsp = 0xfffffe003adfbb80, rbp =
0xfffffe003adfbb80 ---
casueword32_nosmap() at casueword32_nosmap+0x2d/frame 0xfffffe003adfbb80
sigfastblock_setpend() at sigfastblock_setpend+0x4b/frame 0xfffffe003adfbbb0
ast() at ast+0x339/frame 0xfffffe003adfbbf0
doreti_ast() at doreti_ast+0x1f/frame 0x7fffffffe900
KDB: enter: panic
[ thread pid 16434 tid 100129 ]
Stopped at      kdb_enter+0x37: movq    $0,0x10872f6(%rip)
db:0:kdb.enter.panic> show pcpu
cpuid        = 0
dynamic pcpu = 0x787d80
curthread    = 0xfffffe0032df7c00: pid 16434 tid 100129 critnest 1
"flock_helper"
curpcb       = 0xfffffe0032df8100
fpcurthread  = 0xfffffe0032df7c00: pid 16434 "flock_helper"
idlethread   = 0xfffffe000a1f6300: tid 100003 "idle: cpu0"
self         = 0xffffffff82210000
curpmap      = 0xfffffe0032dfab08
tssp         = 0xffffffff82210384
rsp0         = 0xfffffe003adfbcc0
kcr3         = 0x8000000073a9e6f9
ucr3         = 0x8000000073ac8ef9
scr3         = 0x73ac8ef9
gs32p        = 0xffffffff82210404
ldt          = 0xffffffff82210444
tss          = 0xffffffff82210434
tlb gen      = 104535
curvnet      = 0
spin locks held:
db:0:kdb.enter.panic>

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