kernel-packages team mailing list archive

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

Hey Allison, long time no see. :)

> Stefan, what's the most important thing we could do to help you help us?
> I see a few threads of inquiry in the comments that trailed off:

I would say either find a way to reproduce without OpenStack or manage to get
some crashdumps. The crashdumps might be simpler to prepare for and with luck we
catch the issue happening on those hosts set up to crashdump.
While that can be done without too much thought, being able to reproduce it
locally with a minimal dependencies would allow us quicker iterations when
trying fixes. also, Chris and I managed to approach the devstack setup in two
different ways and maybe both of us made little mistakes there (His being more
successful as I thought it to be a good idea to use a Xen guest but have not
thought of whether openstack supports nested with Xen).

> - abstracting Salvatore's script for high thrash rates on VM
> creation/destruction and network namespace creation, to try reproducing
> the issue without running openstack
> - capturing crashdumps from a devstack gate run (or simulated gate run
> on a local machine)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1273386

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

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

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
  proxy.

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

  logstash query:
  http://logstash.openstack.org/#eyJzZWFyY2giOiJcImtlcm5lbCBCVUcgYXQgL2J1aWxkL2J1aWxkZC9saW51eC0zLjIuMC9mcy9idWZmZXIuYzoyOTE3XCIgYW5kIGZpbGVuYW1lOnN5c2xvZy50eHQiLCJmaWVsZHMiOltdLCJvZmZzZXQiOjAsInRpbWVmcmFtZSI6ImN1c3RvbSIsImdyYXBobW9kZSI6ImNvdW50IiwidGltZSI6eyJmcm9tIjoiMjAxNC0wMS0xNlQxODo1MDo0OCswMDowMCIsInRvIjoiMjAxNC0wMS0yN1QxOToxNjoxMSswMDowMCIsInVzZXJfaW50ZXJ2YWwiOiIwIn0sInN0YW1wIjoxMzkwODUwMzI2ODY0fQ==

  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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