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[Bug 1505564] Re: Soft lockup with "block nbdX: Attempted send on closed socket" spam



That is good feedback. I also received another request to backport this
to 3.13 SO I'll be providing the hotfixed kernel in the same PPA soon
(tomorrow morning most likely).

Attaching the 3.13 patches (just for reference since the SRU process
requires me to send all those patches to kernel-team mailing list).

Lets see if things continue good. If, by any chance, you are able to
test this 3.13 kernel - maybe in another server - please provide me
feedback also.

Thank you very much


Rafael Tinoco

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  Soft lockup with "block nbdX: Attempted send on closed socket" spam

Status in linux package in Ubuntu:
  In Progress

Bug description:
  Some of our nova compute hosts regularly freeze, sometimes for a few
  hours, with kern.log getting spammed with:

  block nbdX: Attempted send on closed socket

  and a few "CPU soft lockup" messages (see attached log). This clears
  up when the queue gets cleared, eg :

  block nbdX: queue cleared

  trusty hosts with kernel version 3.19.0-30-generic.

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