[Bug 279899] pf_unlink_state mutex unlock page fault panic

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

--- Comment #16 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Franco Fichtner from comment #15)
I noticed that days ago but have not tested it yet ...

Kristof does not mention this issue in the commit. I can not conclude but I
guess this issue persists. Anyway I'll try to figure out what's wrong. I
presume https://cgit.freebsd.org/src/commit/?id=2671bde99295d9 revealed a case
that pfsync_drop() will not perform good, as before that backport `ifp->if_bpf`
can not be  NULL so `pfsync_drop()` below the check is unreachable ...

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