[Bug 219250] [Panic] panic: in6_ifattach_linklocal: ia == NULL (assigning ipv6 addresses)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219250

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: vangyzen
Date: Thu Nov  8 19:50:23 UTC 2018
New revision: 340257
URL: https://svnweb.freebsd.org/changeset/base/340257

Log:
  in6_ifattach_linklocal: handle immediate removal of the new LLA

  If another thread immediately removes the link-local address
  added by in6_update_ifa(), in6ifa_ifpforlinklocal() can return NULL,
  so the following assertion (or dereference) is wrong.
  Remove the assertion, and handle NULL somewhat better than panicking.
  This matches all of the other callers of in6_update_ifa().

  PR:           219250
  Reviewed by:  bz, dab (both an earlier version)
  MFC after:    1 week
  Sponsored by: Dell EMC Isilon
  Differential Revision:        https://reviews.freebsd.org/D17898

Changes:
  head/sys/netinet6/in6_ifattach.c

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