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1b1ed1a
(Get the code!)
Hi,
In order to investigate bug LP#1531768, we upgraded some arm64 compute nodes (swirlices) to a 4.4 kernel. I think it made the VMs work better, but the hosts became extremely unstable.
After some time, getting a shell on them would be impossible. Connecting on the VSP, you'd get a prompt, and once you typed your username and password, you'd see the motd but the shell would never spawn.
Because of these instability issues, all the arm64 compute nodes are now back on 4.2. However, we managed to capture "perf record" data when a host was failing. I'll attach it to the bug. Perhaps it will give you hints as to what we can do to help you troubleshoot this bug further.
Once we have your instructions, we'll happily reboot one (or a few) nodes to 4.4 to continue troubleshooting.
Thanks !