[Bug 1743249] Re: Failed Deployment after timeout trying to retrieve grub cfg

[Jason Hobbs]

Here is part of a packet capture on my environment:
http://paste.ubuntu.com/26509374/

>From the other tftp server on the deploy:
http://paste.ubuntu.com/26509386/

The whole pcap is prohibitively large because it's for multiple hosts.

You can see from this that grub is only reading the file once now, so
that grub bug has been fixed.

You can also see that MAAS is still taking a while to respond to the
request sometimes - 6 seconds in this capture.

There were no failures on this run, but we don't have failures every
time, so that doesn't prove anything.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/1743249

Title:
  Failed Deployment after timeout trying to retrieve grub cfg

Status in MAAS:
  Incomplete
Status in grub2 package in Ubuntu:
  Triaged

Bug description:
  A node failed to deploy after it failed to retrieve a grub.cfg from
  MAAS due to a timeout.  In the logs, it's clear that the server tried
  to retrieve the grub cfg many times, over about 30 seconds:

  http://paste.ubuntu.com/26387256/

  We see the same thing for other hosts around the same time:

  http://paste.ubuntu.com/26387262/

  It seems like MAAS is taking way too long to respond to these
  requests.

  This is very similar to bug 1724677, which was happening pre-
  metldown/spectre. The only difference is we don't see "[critical] TFTP
  back-end failed" in the logs anymore.

  I connected to the console on this system and it had errors about
  timing out retrieving the grub-cfg, then it had an error message along
  the lines of "error not an ip" and then "double free".  After I
  connected but before I could get a screenshot the system rebooted and
  was directed by maas to power off, which it did successfully after
  booting to linux.

  Full logs are available here:
  https://10.245.162.101/artifacts/14a34b5a-9321-4d1a-b2fa-
  ed277a020e7c/cpe_cloud_395/infra-logs.tar

  This is with 2.3.0-6434-gd354690-0ubuntu1~16.04.1.

To manage notifications about this bug go to:
https://bugs.launchpad.net/maas/+bug/1743249/+subscriptions