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[Launchpad Bug Tracker <1404558@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-46.77

---------------
linux (3.13.0-46.77) trusty; urgency=low

  [ Seth Forshee ]

  * Revert "ipv6: fix swapped ipv4/ipv6 mtu_reduced callbacks"
    - LP: #1404558
  * Release Tracking Bug
    - LP: #1427292
 -- Seth Forshee <seth.forshee@xxxxxxxxxxxxx>   Mon, 02 Mar 2015 11:33:20 -0600

** Changed in: linux (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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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:
  Invalid
Status in linux source package in Trusty:
  Fix Released

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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