Public bug reported:
On SOME (but not all) boots via MAAS, GRUB hangs at the "grub>" prompt.
This happens about 10% or 20% of the time on affected servers (at least
ostwald and meitner, two Supermicro servers).
The MAAS rackd.log file shows that the node has requested and received
GRUB:
2020-11-17 10:08:47 provisioningserver.rackdservices.tftp: [info] bootx64.efi
requested by 10.1.10.82
2020-11-17 10:08:47 provisioningserver.rackdservices.tftp: [info] bootx64.efi
requested by 10.1.10.82
2020-11-17 10:08:50 provisioningserver.rackdservices.tftp: [info] grubx64.efi
requested by 10.1.10.82
On a failed boot, the process then stops; the node does not request
grub.cfg, as happens normally. Watching the console, I see several
notices that read "error: Couldn't send network packet." (See attached
screen shot.)
At the grub> prompt, net_ls_addr shows the expected IP address, and
net_ls_routes shows a routing table; however, net_bootps results in an
error message stating "can't find command `net_bootps`" (see second
attached screen shot.)
Once the system is hung, typing "exit" at the "grub>" prompt causes the
server to try the next boot option, which usually works (booting via
another network interface, in the case of our servers).
As noted, this problem occurs on a minority of boots. It can affect
reboots after deployment, and if it occurs during deployment, it can
prevent deployment because the server will hang at the "grub>" prompt.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: hwcert-server
** Attachment added: "Screen shot showing GRUB complaint about not being able
to send packets"
https://bugs.launchpad.net/bugs/1904588/+attachment/5435179/+files/iKVM_capture.jpg
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https://bugs.launchpad.net/bugs/1904588
Title:
Network boot from MAAS sometimes fails at "grub>" prompt
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