[Bug 734883] Re: mounting HFS+ volumes fails on large sector devices

[Seth Forshee]

I found out about the scsi_debug module that allows creating virtual
scsi devices with various sector sizes. I've been able to reproduce the
problems (with some difficulty). I did find manage to find one issue
with my patch, which I didn't expect to actually be the cause of the
apparent memory corruptions, but I've been torturing my new build for
over 12 hours and haven't been able to produce any problems. I've put a
new build up; please test and see whether the crashes are gone with this
build. Previous warnings about data loss still apply. Thanks!

http://people.canonical.com/~sforshee/lp734883/linux-2.6.38-10.46~lp734883v201107160216/

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Title:
  mounting HFS+ volumes fails on large sector devices

Status in “linux” package in Ubuntu:
  Incomplete
Status in “util-linux” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: util-linux

  Natty Alpha 3

  WIth Natty I only tried now to mount my iPod, but it doesn't work. It
  used to work great under Maverick, though.

  Here's what I get from dmesg:

  [  452.340069] hfs: unable to find HFS+ superblock
  [  452.410078] sd 7:0:0:0: [sdb] Bad block number requested
  [  452.410110] hfs: unable to find HFS+ superblock

  And this is the error message from the GUI dialog:

  Unable to mount 8.1 GB Filesystem

  Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sdb3,
         missing codepage or helper program, or other error
         In some cases useful info is found in syslog - try
         dmesg | tail  or so

  mount:
    Installed: 2.17.2-9.1ubuntu2
    Candidate: 2.17.2-9.1ubuntu2
    Version table:
   *** 2.17.2-9.1ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ natty/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: mount 2.17.2-9.1ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
  Uname: Linux 2.6.38-6-generic x86_64
  NonfreeKernelModules: nvidia wl
  Architecture: amd64
  Date: Mon Mar 14 10:13:28 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110210)
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to natty on 2011-03-08 (5 days ago)

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