[Bug 613720] Re: GRUB2 hangs on boot

[Marcus Tomlinson]

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** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

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Title:
  GRUB2 hangs on boot

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: grub

  I just installed Ubuntu Lucid Lynx. At first grub would just hang on
  boot, so I decided to do some investigation. With the help of someone
  in #grub on irc.freenode.net, I got into a grub console, set the
  debug=all flag and was able to track my problem down to the fact that
  grub hangs while trying to probe my device drives.

  I would boot into the grub console, and type in root (hd0, and then
  hit tab for automatic tab completion. Grub would correctly identify
  (hd0,1) as ext2 and (hd0,2) as swap. However, on (hd0,5) (which should
  be ext2), grub hung.

  In the debug trace, the last line had something to do with the zfs module
  /build/buildd/grub-1.98/zfs/zfs.c:2001: label 1 ok
  /build/buildd/grub-1.98/zfs/zfs.c:2006: No uberblock found

  So, with the guidance of #grub, I renamed the zfs.mod and zfsinfo.mod
  in the /boot/grub directory to zfs.mod-bak and zfsinfo.mod-bak,
  respectively. Once again I rebooted into the shell and tried the tab
  completion, with the debug trace on. This time grub correctly reported
  (hd0,5) as ext2, but failed on (hd0,2), giving the error file not
  found. However, that error did not hang the system. Instead, grub hung
  this time with something to do with the partition table on (hd0,3)
  (which is an extended partition). I'm attaching a screenshot of the
  problem, this time.

  I'm not sure whether it's a bug in grub or a bug in ubuntu, since
  ubuntu uses a modified grub version (vanilla grub doesn't support zfs,
  afaik)

  I'll provide any needed info and am willing to do hacking on grub to
  get this fixed. I have a good amount of experience in OS development.

  Once again

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