[Bug 284457] periodic pf panic on busy jailhost

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284457

--- Comment #9 from Thomas Steen Rasmussen / Tykling <[email protected]> ---
(kgdb) backtrace
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:53
#1  doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:394
#2  0xffffffff80bf5d1e in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:482
#3  0xffffffff80bf61da in vpanic (fmt=0xffffffff8120ec72 "%s",
ap=ap@entry=0xfffffe01aee8bc60) at /usr/src/sys/kern/kern_shutdown.c:921
#4  0xffffffff80bf5ff3 in panic (fmt=<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:845
#5  0xffffffff810b3169 in trap_fatal (frame=0xfffffe01aee8bd40, eva=3358108780)
at /usr/src/sys/amd64/amd64/trap.c:940
#6  0xffffffff810b31b6 in trap_pfault (frame=<unavailable>, usermode=false,
signo=<optimized out>, ucode=<optimized out>) at
/usr/src/sys/amd64/amd64/trap.c:759
#7  <signal handler called>
#8  0xffffffff82f30e7f in pf_state_key_detach (s=0xfffff80206395750, idx=1) at
/usr/src/sys/netpfil/pf/pf.c:1414
#9  pf_detach_state (s=s@entry=0xfffff80206395750) at
/usr/src/sys/netpfil/pf/pf.c:1380
#10 0xffffffff82f324f5 in pf_unlink_state (s=s@entry=0xfffff80206395750,
flags=flags@entry=1) at /usr/src/sys/netpfil/pf/pf.c:2350
#11 0xffffffff82f31bcd in pf_purge_expired_states (i=120411, maxcheck=109) at
/usr/src/sys/netpfil/pf/pf.c:2401
#12 0xffffffff82f31a2b in pf_purge_thread (unused=<optimized out>) at
/usr/src/sys/netpfil/pf/pf.c:2145
#13 0xffffffff80bb159f in fork_exit (callout=0xffffffff82f318f0
<pf_purge_thread>, arg=0x0, frame=0xfffffe01aee8bf40) at
/usr/src/sys/kern/kern_fork.c:1151
#14 <signal handler called>
#15 0x000018c35cb7e32a in ?? ()
Backtrace stopped: Cannot access memory at address 0x18c35a558fc8
(kgdb)

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