Did you find out whether this actually was a regression compared to the
previous kernel? Also, since the problem seems to be something
submitting a bufferhead that is not mapped (anymore?) on releasing the
mount namespace, maybe the content of /proc/<pid>/mount* of the process
about to be killed.

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  Neutron namespace metadata proxy triggers kernel crash on Ubuntu
  12.04/3.2 kernel

Status in OpenStack Neutron (virtual network service):
Status in OpenStack Compute (Nova):
Status in “linux” package in Ubuntu:

Bug description:
  In the past 9 days we have been seeing very frequent occurences of
  this kernel crash: http://paste.openstack.org/show/61869/

  Even if the particular crash pasted here is triggered by dnsmasq, in
  almost all cases the crash is actually triggered by the neutron metada

  This also affects nova badly since this issue, which appears namespace
  related, results in a hang while mounting the ndb device for key

  logstash query:

  We have seen about 398 hits since the bug started to manifest.
  Decreased hit rate in the past few days is due to less neutron patches being 

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