[Bug 233955] [panic] Page fault in in6_purgeaddr (triggered by net/wireguard)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233955

--- Comment #29 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kevans
Date: Tue Apr 23 17:28:28 UTC 2019
New revision: 346602
URL: https://svnweb.freebsd.org/changeset/base/346602

Log:
  tun(4): Defer clearing TUN_OPEN until much later

  tun destruction will not continue until TUN_OPEN is cleared. There are brief
  moments in tunclose where the mutex is dropped and we've already cleared
  TUN_OPEN, so tun_destroy would be able to proceed while we're in the middle
  of cleaning up the tun still. tun_destroy should be blocked until these
  parts (address/route purges, mostly) are complete.

  PR:           233955
  MFC after:    2 weeks

Changes:
  head/sys/net/if_tun.c

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