[Bug 1579609] Re: os-prober bug resulting in possible FS corruption

Wed Jan 18 15:49:06 UTC 2017

os-prober should at least mention which partition failed to probe, so
that one can immediately see whether it's an issue; but should also
probably explicitly skip LVM2_member (as the underlying LVs would get
probed too separately, possibly before the partition is reached
(assuming this is probed in alphabetical order)).

Also, it looks to me like the Windows Boot/System partition (0C01
Microsoft reserved) I left around on a second disk on my system is
detected as "", which should probably be have been "NOT-DETECTED". This
is easily fixable at the same time as LVM2_member, and should help
fixing issues where partitions may be probed when they really should be
ignored.

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https://bugs.launchpad.net/bugs/1579609

Title:
  os-prober bug resulting in possible FS corruption

Status in os-prober package in Ubuntu:
  Fix Released
Status in os-prober source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

  This bug generate some warnings in system log and in some cases it
  also might cause FS corruption as seen with a user using MySQL for his
  Openstack env.

  [Test Case]

  As of today, there is 3 reported way to reproduce the problem so far :

  #1

  Reboot system
  $ sudo update-grub
  then check the log again:
  $ journalctl -p err -b -k --no-pager

  #2
  Placing a VM under IO load (basically just ran dd if=/dev/vda of=/dev/null) and then ran update-grub on the hypervisor host.

  #3
  Simply run: os-prober, on an hypervisor some VM with LVM storage backend.

  [Regression Potential]

  none expected
  A test package has been tested by several users experiencing the issue, and positives feedbacks has been provided in all cases.

  [Other Info]

  Workaround:
  - Disable os-prober
  - Uninstall os-prober

  Debian bug:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=788062
  (Merged 648208 788062 806273 810121)

  Debian Patch:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=806273;filename=v2-0001-use-grub-mount-as-the-sole-source-of-partition-pr.patch;msg=30

  [Original Description]

  According to this it should be fixed
  https://bugs.launchpad.net/ubuntu/+source/os-
  prober/+bug/1374759/comments/32

  But on my system I intended to install on /dev/sdb1 and noticed these
  warning message in my system log.

  Steps to reproduce:

  1. reboot system
  2. $ sudo update-grub
  then check the log again:
  $ journalctl -p err -b -k --no-pager

  -- Logs begin at Sun 2016-05-08 10:47:49 CST, end at Mon 2016-05-09 11:42:04 CST. --
  May 08 10:47:50 X230 kernel: [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
  May 08 10:47:50 X230 kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
  May 08 10:55:34 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:34 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:34 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:34 X230 kernel: FAT-fs (sdb1): invalid media value (0x7d)
  May 08 10:55:34 X230 kernel: squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb1
  May 08 10:55:34 X230 kernel: FAT-fs (sdb1): invalid media value (0x7d)
  May 08 10:55:34 X230 kernel: qnx4: no qnx4 filesystem (no root dir).
  May 08 10:55:34 X230 kernel: ufs: You didn't specify the type of your ufs filesystem

                               mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-
  cd|openstep ...

                               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
  May 08 10:55:34 X230 kernel: ufs: ufs_fill_super(): bad magic number
  May 08 10:55:34 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:34 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:34 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:34 X230 kernel: FAT-fs (sdb4): bogus number of reserved sectors
  May 08 10:55:34 X230 kernel: squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb4
  May 08 10:55:34 X230 kernel: FAT-fs (sdb4): bogus number of reserved sectors
  May 08 10:55:34 X230 kernel: qnx4: no qnx4 filesystem (no root dir).
  May 08 10:55:34 X230 kernel: ufs: You didn't specify the type of your ufs filesystem

                               mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-
  cd|openstep ...

                               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
  May 08 10:55:34 X230 kernel: ufs: ufs_fill_super(): bad magic number
  May 08 10:55:52 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:52 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:52 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:52 X230 kernel: FAT-fs (sdb1): invalid media value (0x7d)
  May 08 10:55:52 X230 kernel: squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb1
  May 08 10:55:52 X230 kernel: FAT-fs (sdb1): invalid media value (0x7d)
  May 08 10:55:52 X230 kernel: qnx4: no qnx4 filesystem (no root dir).
  May 08 10:55:52 X230 kernel: ufs: You didn't specify the type of your ufs filesystem

                               mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-
  cd|openstep ...

                               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
  May 08 10:55:52 X230 kernel: ufs: ufs_fill_super(): bad magic number
  May 08 10:55:52 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:52 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:52 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:52 X230 kernel: FAT-fs (sdb4): bogus number of reserved sectors
  May 08 10:55:52 X230 kernel: squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb4
  May 08 10:55:52 X230 kernel: FAT-fs (sdb4): bogus number of reserved sectors
  May 08 10:55:52 X230 kernel: qnx4: no qnx4 filesystem (no root dir).
  May 08 10:55:52 X230 kernel: ufs: You didn't specify the type of your ufs filesystem

                               mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-
  cd|openstep ...

                               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
  May 08 10:55:52 X230 kernel: ufs: ufs_fill_super(): bad magic number
  May 08 10:55:59 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:59 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:59 X230 kernel: EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
  May 08 10:55:59 X230 kernel: FAT-fs (sdb1): invalid media value (0x7d)
  May 08 10:55:59 X230 kernel: squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb1
  May 08 10:55:59 X230 kernel: FAT-fs (sdb1): invalid media value (0x7d)
  May 08 10:55:59 X230 kernel: qnx4: no qnx4 filesystem (no root dir).
  May 08 10:55:59 X230 kernel: ufs: You didn't specify the type of your ufs filesystem

                               mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-
  cd|openstep ...

                               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
  May 08 10:55:59 X230 kernel: ufs: ufs_fill_super(): bad magic number
  May 08 10:55:59 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:59 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:59 X230 kernel: EXT4-fs (sdb4): VFS: Can't find ext4 filesystem
  May 08 10:55:59 X230 kernel: FAT-fs (sdb4): bogus number of reserved sectors
  May 08 10:55:59 X230 kernel: squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb4
  May 08 10:55:59 X230 kernel: FAT-fs (sdb4): bogus number of reserved sectors
  May 08 10:55:59 X230 kernel: qnx4: no qnx4 filesystem (no root dir).
  May 08 10:55:59 X230 kernel: ufs: You didn't specify the type of your ufs filesystem

                               mount -t ufs -o
  ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-
  cd|openstep ...

                               >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
  May 08 10:55:59 X230 kernel: ufs: ufs_fill_super(): bad magic number
  May 08 21:16:00 X230 kernel: ACPI: \_SB_.PCI0.LPC_.EC__.BAT1: Unable to dock!

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: os-prober 1.70ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon May  9 11:42:57 2016
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libc6 2.23-0ubuntu3
   libgcc1 1:6.0.1-0ubuntu1
  InstallationDate: Installed on 2016-05-03 (5 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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