[Bug 1181720] Re: grub with partition detection issues (horribly slow) since recent update in 13.04

[Lars Steinke]

Well,

all I can say is that I have had no reason to install extlinux, but that
doesn't really matter.

Funnily enough, update-grub does no longer seem to have a hard time running os-prober, now that I have commented out GRUB_DISABLE_OS_PROBER=true again:
real	0m17.431s
user	0m2.080s
sys	0m2.580s
Not that I have applied any updates since - mysterious...

grub.cfg and syslog attached for reference, you can clearly see the
duplicate entries for the raw md0 disks sda1 and sdb1...

** Attachment added: "grub.cfg and syslog excerpt while running update-grub (twice)"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1181720/+attachment/3683132/+files/grub.tgz

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https://bugs.launchpad.net/bugs/1181720

Title:
  grub with partition detection issues (horribly slow) since recent
  update in 13.04

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  1. grub-update takes ages scanning for boot menu entries in the 30_os-prober step (about 35% system load ), which makes kernel updates or removals really painful:
  real	7m54.745s
  user 0m49.140s
  sys	1m8.912s
  2. upon booting, the grub boot menu only appears after several minutes of a monochrome violet screen

  Ubuntu 13.04 is booting from a md RAID1 array (which accounts for two
  grub menu entries) and there is one additional Windows boot entry per
  disk.

  These issues appeared with a round of updates on 13.04 (now 2.00-13ubuntu3), about two weeks ago:
  After the initial update from 12.10 to 13.04 they were not apparent right away (even though it seems 13.04 has introduced extlinux as a chainloader for grub?)...

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: grub2-common 2.00-13ubuntu3
  ProcVersionSignature: Ubuntu 3.8.0-21.32-generic 3.8.8
  Uname: Linux 3.8.0-21-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  Date: Sun May 19 12:52:58 2013
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to raring on 2013-04-29 (20 days ago)

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