[Bug 1050774] Re: os-prober misparses GRUB 2.00 configuration, leading to arbitrarily-long grub.cfg output lines

[Colin Watson]

Thanks, I understand what you mean now.  However, while it would be
nice, GRUB does not currently have a compact encoding of its module ABI
that would allow us to perform such a scan even slightly accurately.

With multiple quantal installations on the same system, since they refer
to each other in their GRUB configuration, I suspect it may take a
couple of alternate runs of update-grub in each installation after
installing my os-prober fix to clear everything out.  You might have a
look at grub.cfg after each run to see if you can recognise the
weirdness from this bug.

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Title:
  os-prober misparses GRUB 2.00 configuration, leading to arbitrarily-
  long grub.cfg output lines

Status in “grub2” package in Ubuntu:
  Triaged
Status in “os-prober” package in Ubuntu:
  Fix Released

Bug description:
  Lubuntu Quantal i386

  Yesterday i've tested grub 2.0 fromm the cjwatson ppa without issue.
  Then i've ran vbeinfo on next boot to fill custom values :
  GRUB_GFXMODE=1024x768,800x600

   Today the new 2.00-3ubuntu1 is upgraded and get that problem. Note
  that ubuntu quantal i386 have been previously upgraded with this
  latest grub 2.0 without that issue.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: grub-common 2.00-3ubuntu1
  Uname: Linux 3.6.0-030600rc5-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.5.1-0ubuntu7
  Architecture: i386
  AssertionMessage: *** glibc detected *** /usr/bin/grub-script-check: double free or corruption (!prev): 0x08210b38 ***
  Date: Fri Sep 14 09:06:51 2012
  ExecutablePath: /usr/bin/grub-script-check
  ProcCmdline: /usr/bin/grub-script-check /boot/grub/grub.cfg.new
  Signal: 6
  SourcePackage: grub2
  StacktraceTop:
   __libc_message (do_abort=2, fmt=0xb77271dc "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:201
   malloc_printerr (action=<optimized out>, str=<optimized out>, ptr=0x8210b38) at malloc.c:5007
   ?? ()
   ?? ()
   ?? ()
  Title: grub-script-check assert failure: *** glibc detected *** /usr/bin/grub-script-check: double free or corruption (!prev): 0x08210b38 ***
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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