Comment 0 for bug 1867542

I did a fresh install on a test laptop of 20.04 a while back, and after today's update, it no longer boots. Today's update included 2.31-0ubuntu6, but other 20.04 machines of mine also applied that and didn't fail, so I can't really be sure it's the cause.

I also have zsys installed, and I noticed there are many snapshots of my datasets, and grub has a new menu entry about history.

All that being said, I'm still troubleshooting and so far these are the facts:

- partition layout:
Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 5244927 4194304 2G Linux swap
/dev/sda3 5244928 9439231 4194304 2G Solaris boot
/dev/sda4 9439232 937703054 928263823 442.6G Solaris root

- grub hangs when doing an ls on (hd0,gpt2), which is swap (?)
- grub hangs when doing an ld on (hd0,gpt4).
- zfs-info (from grub's command line) on gpt3 is happy. It identifies it as bpool
- zfs-info on gpt4 complains it has unsupported features, but does not hang

When booting the system, it hangs right after I select a menu entry in grub, regardless of which one. Even the history ones from zfs hang, although I didn't try all. It looks just like the hang on the simple ls command.

This is grub2 2.04-1ubuntu22, and zsys 0.4.1. I'll see if I can run collect from inside the mounted system in a chroot from a rescue image, and attach info to this log.