https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195191

--- Comment #7 from commit-h...@freebsd.org ---
A commit references this bug:

Author: markj
Date: Tue Apr 30 14:44:40 UTC 2019
New revision: 346960
URL: https://svnweb.freebsd.org/changeset/base/346960

Log:
  Retry upon NET_RT_IFLIST sysctl failure.

  Port the logic used by getifaddrs(3) to handle the case where
  NET_RT_IFLIST returns ENOMEM, which can occur if the list size changes
  between the buffer allocation and sysctl read.

  PR:           195191
  Submitted by: Guy Yur <guy...@gmail.com> (original version)
  MFC after:    1 week

Changes:
  head/usr.sbin/rtadvd/if.c

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