[Bug 220076] [patch] [panic] [netgraph] repeatable kernel panic due to a race in ng_iface(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220076

--- Comment #14 from commit-hook at freebsd.org ---
A commit references this bug:

Author: eugen
Date: Sun Oct  1 19:39:27 UTC 2017
New revision: 324175
URL: https://svnweb.freebsd.org/changeset/base/324175

Log:
  MFC r323873, r324081: Unprotected modification of ng_iface(4)
  private data leads to kernel panic. Fix a race with per-node
  read-mostly lock and refcounting for a hook.

  PR:                   220076
  Tested by:            peixoto.cassiano
  Approved by:          mav (mentor)
  Relnotes:             yes
  Differential Revision:        https://reviews.freebsd.org/D12435

Changes:
_U  stable/11/
  stable/11/sys/netgraph/ng_iface.c

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