[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 #25 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: kp
Date: Sat Sep 12 12:45:32 UTC 2020
New revision: 365659
URL: https://svnweb.freebsd.org/changeset/base/365659

Log:
  MFC r365457:

  net: mitigate vnet / epair cleanup races

  There's a race where dying vnets move their interfaces back to their original
  vnet, and if_epair cleanup (where deleting one interface also deletes the
other
  end of the epair). This is commonly triggered by the pf tests, but also by
  cleanup of vnet jails.

  As we've not yet been able to fix the root cause of the issue work around the
  panic by not dereferencing a NULL softc in epair_qflush() and by not
  re-attaching DYING interfaces.

  This isn't a full fix, but makes a very common panic far less likely.

  PR:           244703, 238870

Changes:
_U  stable/12/
  stable/12/sys/net/if.c
  stable/12/sys/net/if_epair.c

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