[Bug 279899] pf_unlink_state mutex unlock page fault panic

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

--- Comment #13 from Franco Fichtner <franco@opnsense.org> ---
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.

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.

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

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