[Bug 238870] sys.netpfil.pf.names.names and sys.netpfil.pf.synproxy.synproxy cause panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238870

--- Comment #7 from Kristof Provost <kp at freebsd.org> ---
Created attachment 205530
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=205530&action=edit
ifp_dying.patch

A second experimental patch. This solves a different problem, that also
manifests during the pf tests.

It looks like there's a race, where the epair deletes its ifp while the jail
shuts down. The jail shutdown moves the ifp back into its original vnet, while
the epair delete is causing it to be deleted. As a result we end up with a
freed ifp in V_ifnet, and when we run into it later the box panics.

I think this is likely fallout from the epoch-ification, so mmacy@ should take
a look at this.

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