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.
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.