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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1252032

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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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:
  Incomplete

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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