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[Stéphane Graber <stgraber@xxxxxxxxxxxx>]

I don't have a reproducer other than install the kernel and wait 24h as
that's how long it took for some systems to panic...

>From a very quick look, those kernels are mainline kernels,
unfortunately all my hosts are LXC hosts using unprivileged containers
with overlayfs, so I need kernels with the Ubuntu patchset applied for
them to be usable.

For now, I'll go test the current -proposed kernel on my least critical
system, see if I can get that one to panic.

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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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