[Bug 249055] sbin.bectl.bectl_test.bectl_create on openzfs panics i386 kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249055

            Bug ID: 249055
           Summary: sbin.bectl.bectl_test.bectl_create on openzfs panics
                    i386 kernel
           Product: Base System
           Version: CURRENT
          Hardware: i386
                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-i386-test/10388/console

sbin/bectl/bectl_test:bectl_create  ->  can't handle raw ops yet!!!
panic: deadlres_td_on_lock: possible deadlock detected for 0xb8883a0 (swi4:
clock (0)), blocked for 90005 ticks

cpuid = 1
time = 1598333085
KDB: stack backtrace:
db_trace_self_wrapper(69742035,a736b63,d566300,d4c046,1c8b8a00,...) at
db_trace_self_wrapper+0x28/frame 0xd566368
kdb_backtrace(1d09fae0,1,b8883a0,15f95,b5dba84,...) at kdb_backtrace+0x2b/frame
0xd5663c0
vpanic(132102e,d5663fc,d5663fc,d566414,ea0d79,...) at vpanic+0x130/frame
0xd5663dc
panic(132102e,13176ea,b8883a0,b88856c,15f95,...) at panic+0x14/frame 0xd5663f0
deadlres_td_on_lock(15f90) at deadlres_td_on_lock+0xa9/frame 0xd566414
deadlkres(0,d566468) at deadlkres+0x10c/frame 0xd566438
fork_exit(ea0b00,0,d566468,0,0,...) at fork_exit+0x68/frame 0xd566454
fork_trampoline() at 0xffc0340e/frame 0xd566454
--- kthread start
KDB: enter: panic
[ thread pid 0 tid 100097 ]
Stopped at      breakpoint+0x4: popl    %ebp
db:0:kdb.enter.panic> show pcpu
cpuid        = 1
dynamic pcpu = 0x9e8f9c0
curthread    = 0x1d09fae0: pid 0 tid 100097 critnest 1 "deadlkres"
curpcb       = 0xd5664c0
fpcurthread  = none
idlethread   = 0xb5ea000: tid 100004 "idle: cpu1"
APIC ID      = 1
currentldt   = 0x50
trampstk     = 0xffc0aff0
kesp0        = 0xd5664b0
common_tssp  = 0xffc01198
tlb gen      = 111093
curvnet      = 0
spin locks held:
db:0:kdb.enter.panic> alltrace

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