kernel-packages team mailing list archive

[Junien Fridrick <1505564@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hi,

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.

Note that timestamps from kern.log appears to be wrong, it looks like
the messages are being held, and then all delivered at once when the
kernel unfreezes.

Attaching apport files from 2 hosts below.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1505564

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

Status in linux package in Ubuntu:
  New

Bug description:
  Hi,

  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.

  Note that timestamps from kern.log appears to be wrong, it looks like
  the messages are being held, and then all delivered at once when the
  kernel unfreezes.

  Attaching apport files from 2 hosts below.

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