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[Bug 1273386] Re: Neutron namespace metadata proxy triggers kernel crash on Ubuntu 12.04/3.2 kernel


More info.
The crash actually happen when a process is killed. This has consistently happened in 10 failures I've analyzed.
So the first conclusion is that this might be, after all, a red herring, and the kernel dump being merely a consequence of the abrupt killing of a process.

I've pushed this to verify whether this is the case:

In this patch, I'm trying to use, just for testing purposes, SIGTERM
instead of SIGKILL

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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 pushed.

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