[Bug 227720] Kernel panic in ppp server

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227720

--- Comment #39 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Tue Nov 27 09:04:06 UTC 2018
New revision: 341008
URL: https://svnweb.freebsd.org/changeset/base/341008

Log:
  Fix possible panic during ifnet detach in rtsock.

  The panic can happen, when some application does dump of routing table
  using sysctl interface. To prevent this, set IFF_DYING flag in
  if_detach_internal() function, when ifnet under lock is removed from
  the chain. In sysctl_rtsock() take IFNET_RLOCK_NOSLEEP() to prevent
  ifnet detach during routes enumeration. In case, if some interface was
  detached in the time before we take the lock, add the check, that ifnet
  is not DYING. This prevents access to memory that could be freed after
  ifnet is unlinked.

  PR:           227720, 230498, 233306
  Reviewed by:  bz, eugen
  MFC after:    1 week
  Sponsored by: Yandex LLC
  Differential Revision:        https://reviews.freebsd.org/D18338

Changes:
  head/sys/net/if.c
  head/sys/net/rtsock.c

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