[Bug 1184067] [NEW] grub-mount burns through CPU without reason

[nh2]

Public bug reported:

I just removed 6 older kernels with apt-get purge. It took 20 minutes
because for each removed kernel, a new grub config is written, for which

    grub-mount /dev/sdb4 /var/lib/os-prober/mount

is called. Compared to my other partitions, which contain Linuxes and
Windowses, /dev/sdb4 is just a plain NTFS partition - yet grub-mount
spends > one full minute of 100% CPU time on that.

What is it doing on that partition?

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: grub2 2.00-13ubuntu3
Uname: Linux 3.8.13-030813-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Sat May 25 12:29:04 2013
InstallationDate: Installed on 2012-05-21 (368 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
SourcePackage: grub2
UpgradeStatus: Upgraded to raring on 2013-04-27 (27 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1184067

Title:
  grub-mount burns through CPU without reason

Status in “grub2” package in Ubuntu:
  New

Bug description:
  I just removed 6 older kernels with apt-get purge. It took 20 minutes
  because for each removed kernel, a new grub config is written, for
  which

      grub-mount /dev/sdb4 /var/lib/os-prober/mount

  is called. Compared to my other partitions, which contain Linuxes and
  Windowses, /dev/sdb4 is just a plain NTFS partition - yet grub-mount
  spends > one full minute of 100% CPU time on that.

  What is it doing on that partition?

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: grub2 2.00-13ubuntu3
  Uname: Linux 3.8.13-030813-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  Date: Sat May 25 12:29:04 2013
  InstallationDate: Installed on 2012-05-21 (368 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  SourcePackage: grub2
  UpgradeStatus: Upgraded to raring on 2013-04-27 (27 days ago)

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