[Bug 279899] pf_unlink_state mutex unlock page fault panic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279899

--- Comment #14 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Franco Fichtner from comment #13)
> Bisecting this is a little tricky due to the random nature but I think it's the
> backport of
>
> https://cgit.freebsd.org/src/commit/?id=2671bde99295d9
>
> which now runs pfsync_drop() which is what happens when you don't use pfsync which
> didn't happen before as the commit suggests.

Yes, your analysis is right.

> INVARIANTS appears to trip over:
> 
> panic: pfsync_drop: st->sync_state == q
> 
> without INVARIANTS it just continues and let's this crash at pf_unlink_state() later on.

Yes. Exactly.

> Maybe it's wrong but I also don't appreciate the lack of enthusiasm looking into
> fixing regressions on stable branches. At least there is enough information on the
> table already to do something but I don't see any engagement.
>
> Cheers,
> Franco

Sorry for that. I have busy days. I tried to repeat but failed. Maybe I have
wrong configuration of if_pfsync.

May Daniel, Gyver, or you share a minimal setup? This should be repeated also
on main IMO.

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