[Bug 215963] panic after restart ppp process in nonzero FIB //locking problem ?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215963

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Tue Jun 13 10:52:31 UTC 2017
New revision: 319895
URL: https://svnweb.freebsd.org/changeset/base/319895

Log:
  Resurrect RTF_RNH_LOCKED flag and restore ability to call rtalloc1_fib()
  with acquired RIB lock.

  This fixes a possible panic due to trying to acquire RIB rlock when it is
  already exclusive locked.

  PR:           215963, 215122
  MFC after:    1 week
  Sponsored by: Yandex LLC

Changes:
  head/sys/net/route.c
  head/sys/net/route.h

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