[Bug 197059] network locks up with IPv6 udp traffic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197059

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Wed Mar  4 11:20:03 UTC 2015
New revision: 279588
URL: https://svnweb.freebsd.org/changeset/base/279588

Log:
  Fix deadlock in IPv6 PCB code.

  When several threads are trying to send datagram to the same destination,
  but fragmentation is disabled and datagram size exceeds link MTU,
  ip6_output() calls pfctlinput2(PRC_MSGSIZE). It does notify all
  sockets wanted to know MTU to this destination. And since all threads
  hold PCB lock while sending, taking the lock for each PCB in the
  in6_pcbnotify() leads to deadlock.

  RFC 3542 p.11.3 suggests notify all application wanted to receive
  IPV6_PATHMTU ancillary data for each ICMPv6 packet too big message.
  But it doesn't require this, when we don't receive ICMPv6 message.

  Change ip6_notify_pmtu() function to be able use it directly from
  ip6_output() to notify only one socket, and to notify all sockets
  when ICMPv6 packet too big message received.

  PR:        197059
  Differential Revision:    https://reviews.freebsd.org/D1949
  Reviewed by:    no objection from #network
  Obtained from:    Yandex LLC
  MFC after:    1 week
  Sponsored by:    Yandex LLC

Changes:
  head/sys/netinet6/in6_pcb.c
  head/sys/netinet6/ip6_input.c
  head/sys/netinet6/ip6_output.c
  head/sys/netinet6/ip6_var.h

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