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[Dadio <dominique@xxxxxxxxxxxxxxxxxxxxx>]

I also have this issue with a Ubuntu 15.04 on a HP server with 3 disks in raid 5. It seems grub wants to test on one of the disks of my raid. This is really scary. Grub seems to want to mount the second disk of the raid separately???
Linux CmsrvVH3 3.19.0-30-generic #33-Ubuntu SMP Mon Sep 21 20:58:04 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
See log below...

(I have a the same server also with Ubuntu 14.04.3 LTS with 4 disks in raid 5 and  4 disks in raid 10. Here I don't have this issue.
Linux CmsrvVH2 3.19.0-30-generic #33~14.04.1-Ubuntu SMP Tue Sep 22 09:27:00 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux)

Oct  6 03:36:04 CmsrvVH3 kernel: [49638.681667] QNX4 filesystem 0.2.3 registered.
Oct  6 03:36:04 CmsrvVH3 kernel: [49638.684795] Request for unknown module key 'Magrathea: Glacier signing key: 08411dd668c266d59a96c625b3012497b2351542' err -11
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.928320] EXT4-fs (cciss!c0d0p2): unable to read superblock
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.960826] EXT4-fs (cciss!c0d0p2): unable to read superblock
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.962326] EXT4-fs (cciss!c0d0p2): unable to read superblock
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.963760] FAT-fs (cciss/c0d0p2): bogus number of reserved sectors
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.963853] FAT-fs (cciss/c0d0p2): Can't find a valid FAT filesystem
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.970120] XFS (cciss/c0d0p2): Invalid superblock magic number
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.972479] FAT-fs (cciss/c0d0p2): bogus number of reserved sectors
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.972569] FAT-fs (cciss/c0d0p2): Can't find a valid FAT filesystem
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.976369] MINIX-fs: unable to read superblock
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.978463] Request for unknown module key 'Magrathea: Glacier signing key: 08411dd668c266d59a96c625b3012497b2351542' err -11
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.983525] attempt to access beyond end of device
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.983528] cciss/c0d0p2: rw=16, want=3, limit=2
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.983531] hfsplus: unable to find HFS+ superblock
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.984786] qnx4: no qnx4 filesystem (no root dir).
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.986333] ufs: You didn't specify the type of your ufs filesystem
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.986333]
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.986333] mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.986333]
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.986333] >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
Oct  6 03:36:05 CmsrvVH3 kernel: [49639.991044] hfs: can't find a HFS filesystem on dev cciss/c0d0p2

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https://bugs.launchpad.net/bugs/1374759

Title:
  >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is
  ufstype=old

Status in initramfs-tools package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Triaged
Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  [  556.734157] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
  [  556.746268] JFS: nTxBlock = 8192, nTxLock = 65536
  [  556.763789] ntfs: driver 2.1.30 [Flags: R/O MODULE].
  [  556.792231] QNX4 filesystem 0.2.3 registered.
  [  557.922469] EXT4-fs (sda4): unable to read superblock
  [  557.925868] EXT4-fs (sda4): unable to read superblock
  [  557.928967] EXT4-fs (sda4): unable to read superblock
  [  557.931784] FAT-fs (sda4): bogus number of reserved sectors
  [  557.931791] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  557.946740] XFS (sda4): Invalid superblock magic number
  [  557.951904] FAT-fs (sda4): bogus number of reserved sectors
  [  557.951911] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  557.959099] MINIX-fs: unable to read superblock
  [  557.965712] attempt to access beyond end of device
  [  557.965721] sda4: rw=16, want=3, limit=2
  [  557.965725] hfsplus: unable to find HFS+ superblock
  [  557.968487] qnx4: no qnx4 filesystem (no root dir).
  [  557.971203] 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
  [  557.974459] hfs: can't find a HFS filesystem on dev sda4
  [  564.034208] EXT4-fs (sda4): unable to read superblock
  [  564.040322] EXT4-fs (sda4): unable to read superblock
  [  564.043485] EXT4-fs (sda4): unable to read superblock
  [  564.047076] FAT-fs (sda4): bogus number of reserved sectors
  [  564.047083] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  564.059578] XFS (sda4): Invalid superblock magic number
  [  564.064473] FAT-fs (sda4): bogus number of reserved sectors
  [  564.064489] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  564.072080] MINIX-fs: unable to read superblock
  [  564.074564] attempt to access beyond end of device
  [  564.074571] sda4: rw=16, want=3, limit=2
  [  564.074576] hfsplus: unable to find HFS+ superblock
  [  564.076688] qnx4: no qnx4 filesystem (no root dir).
  [  564.078847] 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
  [  564.080902] hfs: can't find a HFS filesystem on dev sda4
  [  570.554296] EXT4-fs (sda4): unable to read superblock
  [  570.557647] EXT4-fs (sda4): unable to read superblock
  [  570.560516] EXT4-fs (sda4): unable to read superblock
  [  570.563451] FAT-fs (sda4): bogus number of reserved sectors
  [  570.563460] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  570.574953] XFS (sda4): Invalid superblock magic number
  [  570.580796] FAT-fs (sda4): bogus number of reserved sectors
  [  570.580806] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  570.588340] MINIX-fs: unable to read superblock
  [  570.590983] attempt to access beyond end of device
  [  570.590993] sda4: rw=16, want=3, limit=2
  [  570.590999] hfsplus: unable to find HFS+ superblock
  [  570.593321] qnx4: no qnx4 filesystem (no root dir).
  [  570.595556] 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
  [  570.597775] hfs: can't find a HFS filesystem on dev sda4
  [  576.795014] EXT4-fs (sda4): unable to read superblock
  [  576.797554] EXT4-fs (sda4): unable to read superblock
  [  576.800063] EXT4-fs (sda4): unable to read superblock
  [  576.802647] FAT-fs (sda4): bogus number of reserved sectors
  [  576.802655] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  576.813305] XFS (sda4): Invalid superblock magic number
  [  576.820257] FAT-fs (sda4): bogus number of reserved sectors
  [  576.820276] FAT-fs (sda4): Can't find a valid FAT filesystem
  [  576.830945] MINIX-fs: unable to read superblock
  [  576.834108] attempt to access beyond end of device
  [  576.834119] sda4: rw=16, want=3, limit=2
  [  576.834125] hfsplus: unable to find HFS+ superblock
  [  576.837264] qnx4: no qnx4 filesystem (no root dir).
  [  576.840408] 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
  [  576.843535] hfs: can't find a HFS filesystem on dev sda4

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-18-generic 3.16.0-18.25
  ProcVersionSignature: Ubuntu 3.16.0-18.25-generic 3.16.3
  Uname: Linux 3.16.0-18-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  caravena   2117 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sat Sep 27 10:39:43 2014
  HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
  InstallationDate: Installed on 2014-09-25 (2 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-18-generic root=UUID=0fb75fae-baa3-428b-ace4-498e69ff7fb6 ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-18-generic N/A
   linux-backports-modules-3.16.0-18-generic  N/A
   linux-firmware                             1.134
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P14AAJ
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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