[Bug 1625358] Re: os-prober tries to mount bios_grub (BIOS boot) partition

Brian Martin launchpad at martinconsulting.com
Thu Dec 22 21:37:43 UTC 2016 

My parted output for this partition is:

Number  Start   End     Size    File system  Name       Flags
 1      1049kB  8389kB  7340kB               bios_grub  bios_grub

Ideally, the bios_grub flag could be used to tell relevant code (os-
prober, apparently) to ignore this partition.  That would eliminate 96
scary messages from my boot log.  There are two disks on my system (for
failover purposes), each with a bios_grub flag.  Each one gets 48 of
these useless messages.  For some reason, os-prober is probing each disk
multiple times.  Since I monitor my logs closely, I'd love to have these
go away. Log messages for one of the two disks appears below, just in
case there's some new information in them.

---

> Dec 21 05:26:46 samantha kernel: [1024918.757361] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
-> Dec 21 05:26:46 samantha kernel: [1024918.762203] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
-> Dec 21 05:26:46 samantha kernel: [1024918.767102] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
-> Dec 21 05:26:46 samantha kernel: [1024918.771882] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sda1
-> Dec 21 05:26:46 samantha kernel: [1024918.776705] FAT-fs (sda1): invalid media value (0x7d)
-> Dec 21 05:26:46 samantha kernel: [1024918.776803] FAT-fs (sda1): Can't find a valid FAT filesystem
-> Dec 21 05:26:46 samantha kernel: [1024918.791838] XFS (sda1): Invalid superblock magic number
-> Dec 21 05:26:46 samantha kernel: [1024918.801632] FAT-fs (sda1): invalid media value (0x7d)
-> Dec 21 05:26:46 samantha kernel: [1024918.801730] FAT-fs (sda1): Can't find a valid FAT filesystem
-> Dec 21 05:26:46 samantha kernel: [1024918.815672] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sda1.
-> Dec 21 05:26:47 samantha kernel: [1024918.843397] hfsplus: unable to find HFS+ superblock
-> Dec 21 05:26:47 samantha kernel: [1024918.848163] qnx4: no qnx4 filesystem (no root dir).
-> Dec 21 05:26:47 samantha kernel: [1024918.852787] ufs: You didn't specify the type of your ufs filesystem
-> Dec 21 05:26:47 samantha kernel: [1024918.852787] mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
-> Dec 21 05:26:47 samantha kernel: [1024918.852787] >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
-> Dec 21 05:26:47 samantha kernel: [1024918.853511] ufs: ufs_fill_super(): bad magic number
-> Dec 21 05:26:47 samantha kernel: [1024918.863201] hfs: can't find a HFS filesystem on dev sda1
-> Dec 21 05:26:47 samantha kernel: [1024919.062796] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
-> Dec 21 05:26:47 samantha kernel: [1024919.067520] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
-> Dec 21 05:26:47 samantha kernel: [1024919.072411] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
-> Dec 21 05:26:47 samantha kernel: [1024919.077055] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb1
-> Dec 21 05:26:47 samantha kernel: [1024919.081806] FAT-fs (sdb1): invalid media value (0x7d)
-> Dec 21 05:26:47 samantha kernel: [1024919.081904] FAT-fs (sdb1): Can't find a valid FAT filesystem
-> Dec 21 05:26:47 samantha kernel: [1024919.097725] XFS (sdb1): Invalid superblock magic number
-> Dec 21 05:26:47 samantha kernel: [1024919.107655] FAT-fs (sdb1): invalid media value (0x7d)
-> Dec 21 05:26:47 samantha kernel: [1024919.107754] FAT-fs (sdb1): Can't find a valid FAT filesystem
-> Dec 21 05:26:47 samantha kernel: [1024919.121471] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sdb1.
-> Dec 21 05:26:47 samantha kernel: [1024919.126085] hfsplus: unable to find HFS+ superblock
-> Dec 21 05:26:47 samantha kernel: [1024919.130815] qnx4: no qnx4 filesystem (no root dir).
-> Dec 21 05:26:47 samantha kernel: [1024919.135241] ufs: You didn't specify the type of your ufs filesystem
-> Dec 21 05:26:47 samantha kernel: [1024919.135241] mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
-> Dec 21 05:26:47 samantha kernel: [1024919.135241] >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
-> Dec 21 05:26:47 samantha kernel: [1024919.135996] ufs: ufs_fill_super(): bad magic number
-> Dec 21 05:26:47 samantha kernel: [1024919.145351] hfs: can't find a HFS filesystem on dev sdb1
-> Dec 21 05:27:41 samantha kernel: [1024973.119969] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.124592] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.129261] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.133842] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sda1
-> Dec 21 05:27:41 samantha kernel: [1024973.138461] FAT-fs (sda1): invalid media value (0x7d)
-> Dec 21 05:27:41 samantha kernel: [1024973.138559] FAT-fs (sda1): Can't find a valid FAT filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.165578] XFS (sda1): Invalid superblock magic number
-> Dec 21 05:27:41 samantha kernel: [1024973.175276] FAT-fs (sda1): invalid media value (0x7d)
-> Dec 21 05:27:41 samantha kernel: [1024973.175374] FAT-fs (sda1): Can't find a valid FAT filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.189100] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sda1.
-> Dec 21 05:27:41 samantha kernel: [1024973.193887] hfsplus: unable to find HFS+ superblock
-> Dec 21 05:27:41 samantha kernel: [1024973.198351] qnx4: no qnx4 filesystem (no root dir).
-> Dec 21 05:27:41 samantha kernel: [1024973.202846] ufs: You didn't specify the type of your ufs filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.202846] mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
-> Dec 21 05:27:41 samantha kernel: [1024973.202846] >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
-> Dec 21 05:27:41 samantha kernel: [1024973.203554] ufs: ufs_fill_super(): bad magic number
-> Dec 21 05:27:41 samantha kernel: [1024973.212929] hfs: can't find a HFS filesystem on dev sda1
-> Dec 21 05:27:41 samantha kernel: [1024973.412851] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.417484] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.422210] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.426848] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sdb1
-> Dec 21 05:27:41 samantha kernel: [1024973.434952] FAT-fs (sdb1): invalid media value (0x7d)
-> Dec 21 05:27:41 samantha kernel: [1024973.438393] FAT-fs (sdb1): Can't find a valid FAT filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.454082] XFS (sdb1): Invalid superblock magic number
-> Dec 21 05:27:41 samantha kernel: [1024973.463565] FAT-fs (sdb1): invalid media value (0x7d)
-> Dec 21 05:27:41 samantha kernel: [1024973.466975] FAT-fs (sdb1): Can't find a valid FAT filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.480804] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sdb1.
-> Dec 21 05:27:41 samantha kernel: [1024973.485419] hfsplus: unable to find HFS+ superblock
-> Dec 21 05:27:41 samantha kernel: [1024973.489912] qnx4: no qnx4 filesystem (no root dir).
-> Dec 21 05:27:41 samantha kernel: [1024973.497625] ufs: You didn't specify the type of your ufs filesystem
-> Dec 21 05:27:41 samantha kernel: [1024973.497625] mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
-> Dec 21 05:27:41 samantha kernel: [1024973.497625] >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
-> Dec 21 05:27:41 samantha kernel: [1024973.515267] ufs: ufs_fill_super(): bad magic number
-> Dec 21 05:27:41 samantha kernel: [1024973.528084] hfs: can't find a HFS filesystem on dev sdb1

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https://bugs.launchpad.net/bugs/1625358

Title:
  os-prober tries to mount bios_grub (BIOS boot) partition

Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  After a kernel update, update-grub is triggered and calls os-prober,
  which tries to mount a BIOS boot or bios_grub partition, this


  [ 4207.126455] SGI XFS with ACLs, security attributes, realtime, no debug enabled
  [ 4207.179019] JFS: nTxBlock = 8192, nTxLock = 65536
  [ 4207.237139] ntfs: driver 2.1.32 [Flags: R/O MODULE].
  [ 4207.312000] QNX4 filesystem 0.2.3 registered.
  [ 4207.504556] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
  [ 4207.508148] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
  [ 4207.511768] EXT4-fs (sda1): VFS: Can't find ext4 filesystem
  [ 4207.516335] squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on sda1
  [ 4207.520951] FAT-fs (sda1): invalid media value (0x7d)
  [ 4207.520962] FAT-fs (sda1): Can't find a valid FAT filesystem
  [ 4207.537370] XFS (sda1): Invalid superblock magic number
  [ 4207.572688] FAT-fs (sda1): invalid media value (0x7d)
  [ 4207.572699] FAT-fs (sda1): Can't find a valid FAT filesystem
  [ 4207.582957] VFS: Can't find a Minix filesystem V1 | V2 | V3 on device sda1.
  [ 4207.605925] hfsplus: unable to find HFS+ superblock
  [ 4207.613271] qnx4: no qnx4 filesystem (no root dir).
  [ 4207.617614] 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
  [ 4207.617978] ufs: ufs_fill_super(): bad magic number
  [ 4207.622340] hfs: can't find a HFS filesystem on dev sda1


  A similar patch[1] like the one added in bug 1374759 could fix this,
  but for the corresponding partition type.

  [1] https://launchpadlibrarian.net/247090905/skip-msdos-extpart-
  sooner.debdiff

  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: os-prober 1.70ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic i686
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: i386
  Date: Mon Sep 19 15:16:42 2016
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libc6 2.23-0ubuntu3
   libgcc1 1:6.0.1-0ubuntu1
  InstallationDate: Installed on 2016-09-18 (1 days ago)
  InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release i386 (20160719)
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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