[Bug 260406] pfctl: Cannot allocate memory (after a time)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260406

--- Comment #76 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Mark Johnston from comment #75)
The problem has to do with the reimplementation of zone limits in 13.0.  pf may
allocate items from the table entry zone before a limit is set, and these items
won't be counted.  When a limit is set, and the uncounted items are freed (as
can happen if there's a memory shortage), then they end up underflowing our
counter.

uma_zone_set_max() is missing an assertion that would have caught this.  pf
also needs to set a dummy limit on the table entry zone at initialization time.
 I'm not sure if other pf zones might have the same problem.  I'll work on a
patch.

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