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
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