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

[Steve Langasek]

Attached is an (unsigned) test grubnetx64.efi, built from xenial grub2
plus my patch.  Please deploy this in the maas tftp environment where
you are experiencing the timeouts, and give feedback on whether it helps
with the primary symptom.

** Attachment added: "grubnetx64.efi"
   https://bugs.launchpad.net/maas/+bug/1743249/+attachment/5047679/+files/grubnetx64.efi

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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.

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