+1 Mike. I agree it's a bug, but it there isn't real evidence that it's what causes the long delay.
On Mon, Feb 5, 2018 at 7:12 PM, Mike Pontillo <[email protected]> wrote: > Ah, I see what you mean there; I used the following filter in Wireshark: > > udp.dstport == 25305 or udp.srcport == 25305 > > This is not the behavior I saw if the TFTP request is answered in a > timely manner, so I suspect that the long delay between the initial > request and the answer is causing the timeouts to occur in the TFTP > code, which causes this separate "stacked OACK" bug. > > By the time the "stacked OACKs" are sent, it's been over one minute, and > the client isn't listening for a reply any more. So yes, "stacked OACKs" > are a real bug, but right now I think they're just distracting from the > root cause (the long delay). > > -- > 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
