[Bug 200323] BPF userland misuse can crash the system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200323

--- Comment #8 from Ermal Luçi <eri at pfsense.org> ---
(In reply to Franco Fichtner from comment #7)
Oh you refer to the decrement of the la preempt value.
Yeah but i highly dislike unlock and relock again code paths, that can be a
solution.
Or moving this to atomics or even to a taskqueue might be better than this.

Still since the entry is just going to be updated or removed shortly after
timeout/reply i am not sure the implications if any there.

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