@Mike, you can see the stacked response behavior in https://bugs.launchpad.net/maas/+bug/1743249/+attachment/5046952/+files/spearow-fall-back-to-default-amd64.pcap
You can tell packet 90573 is a response to the requests for grub.cfg-<mac> because its destination port (25305) is the src port the request for grub.cfg-<mac> was coming from (packets 2 through 38). On Mon, Feb 5, 2018 at 6:11 PM, Mike Pontillo <mike.ponti...@canonical.com> wrote: > Steve, can you be more specific about which packet capture showed the > "stacked OACK" behavior? > > I looked at a packet capture Andres pointed me to, and don't see the > "stacked OACKs" you describe. Each TFTP transaction (per RFC 1350) is > indicated by the (source port, dest port) tuple, and I see that MAAS > correctly OACKs each individual transaction (per RFC 2347) - not the > retry packets within the same transaction. Subsequently (in the same > second, after the client ACKs the data packet) it re-requests the same > file (which is the bug in grub that I understand is fixed), and then the > client starts a new transaction and MAAS correctly issues another OACK. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1743249 > > Title: > Failed Deployment after timeout trying to retrieve grub cfg > > Status in MAAS: > New > Status in grub2 package in Ubuntu: > In Progress > > 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1743249 Title: Failed Deployment after timeout trying to retrieve grub cfg To manage notifications about this bug go to: https://bugs.launchpad.net/maas/+bug/1743249/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
