[Bug 220830] STABLE/11 (11.1-RC3, with ZFS bootstrap loader r1.1) kernel (GENERIC) panic; integer divide fault, trap number 18, current process 16 (pf purge)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220830

pherman at frenchfries.net changed:

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                 CC|                            |pherman at frenchfries.net

--- Comment #4 from pherman at frenchfries.net ---
Hi,

I can reproduce this.  This is a divide by zero in sys/netpfil/pf/pf.c 
pf_purge_thread(). 
https://svnweb.freebsd.org/base/stable/11/sys/netpfil/pf/pf.c?annotate=316640#l1446
  The V_pf_default_rule.timeout array hasn't been initialized yet.

This happens presumably because pf_load() is getting called before
pfattach_vnet() (i.e. pf_load_vnet()).   Anyone know what determines the order,
or how to enforce this type of "dependency"?

It smells like a race condition, which could be why not everyone can reproduce
it, but on my hardware it's 100%.  I also suspect this has to do with
EARLY_AP_STARTUP, because I have yet to see the same panic with
EARLY_AP_STARTUP disabled.  Still testing.

BTW, my kernel config is simple:

include         GENERIC

device         carp
device         pf
#nooptions     EARLY_AP_STARTUP

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