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[Launchpad Bug Tracker <1252032@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1252032

Title:
  hard hang when using l2tpd/pppd with IPv6

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I'm not completely sure how to summarise this bug, but it's obviously
  potentially fatal and related to the kernel components of either
  xl2tpd, pppd or IPv6.

  I have an IPv6 connection using xl2tpd to make a ppp connection and
  then route IPv6 over that... this works fine, but if I stress it using
  heavy traffic such as bittorrent, the entire system will lock up at
  the kernel level after a time, between 10 minutes and 1 hour
  approximately.

  This is using Trusty with the 3.12 kernel as of 17/Nov 2013...   I'm
  really not sure how to go about debugging this, the only clue I can
  find is this:-

  Nov 16 23:32:17 trinity xl2tpd[2849]: check_control: Received out of order control packet on tunnel 35506 (got 4, expected 5)
  Nov 16 23:32:17 trinity xl2tpd[2849]: handle_packet: bad control packet!
  Nov 16 23:32:18 trinity xl2tpd[2849]: check_control: Received out of order control packet on tunnel 35506 (got 4, expected 5)
  Nov 16 23:32:18 trinity xl2tpd[2849]: handle_packet: bad control packet!
  Nov 16 23:32:19 trinity xl2tpd[2849]: check_control: Received out of order control packet on tunnel 35506 (got 4, expected 5)
  Nov 16 23:32:19 trinity xl2tpd[2849]: handle_packet: bad control packet!
  Nov 16 23:32:20 trinity xl2tpd[2849]: check_control: Received out of order control packet on tunnel 35506 (got 4, expected 5)
  Nov 16 23:32:20 trinity xl2tpd[2849]: handle_packet: bad control packet!
  Nov 16 23:32:21 trinity xl2tpd[2849]: control_finish: Connection closed to 85.119.84.18, port 1701 (Timeout), Local: 25286, Remote: 35506
  Nov 16 23:32:21 trinity xl2tpd[2849]: Terminating pppd: sending TERM signal to pid 7386

  The connection is then re-established..

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