kernel-packages team mailing list archive

[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

This might be related to a backport issue in the upstream stable patch
below:

  commit 4fab9071950c2021d846e18351e0f46a1cffd67b
  Author: Neal Cardwell <ncardwell@xxxxxxxxxx>
  Date:   Thu Aug 14 12:40:05 2014 -0400

    tcp: fix tcp_release_cb() to dispatch via address family for
mtu_reduced()

I have produced some test kernels with the backport corrected, could you
try the kernels below to confirm if this is indeed the underlying issue.
Kernels are at the URL below:

    http://people.canonical.com/~apw/lp1404558-trusty/

Please report any testing back here.

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https://bugs.launchpad.net/bugs/1404558

Title:
  IPv6 related kernel panic following upgrade to 3.13.0-43

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After updating a dozen machines from 3.13.0-40 to 3.13.0-43, they all
  kernel panic within the next 24 hours.

  I managed to pull the console from one over an IP KVM and it shows a panic related to IPv6 networking:
  https://dl.stgraber.org/panic-3.13-43.png

  All affected machines had native IPv6 connectivity to the Internet.

  Downgrading to 3.13.0-40 resolved the issue (so it's clearly a
  regression) and upgrading to lts-utopic 3.16.0-28-generic also
  appeared to do the trick.

  
  A friend also just reported seeing the exact same problem on his server which also has native IPv6 connectivity so the issue appears pretty widespread.

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