[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 #27 from commit-hook at freebsd.org ---
A commit references this bug:

Author: decke
Date: Tue Apr 23 12:33:45 UTC 2019
New revision: 499754
URL: https://svnweb.freebsd.org/changeset/ports/499754

Log:
  net/wireguard:
  work around numerous kernel panics on shutdown in tun(4)

  There are numerous race conditions. But even this will crash it:

  while true; do ifconfig tun0 create; ifconfig tun0 destroy; done

  It seems like LLv6 is related, which we're not using anyway, so
  explicitly disable it on the interface.

  PR:           233955

Changes:
  head/net/wireguard-go/Makefile
  head/net/wireguard-go/files/
  head/net/wireguard-go/files/patch-bb42ec7d185ab5f5cd3867ac1258edff86b7f307

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