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[Bug 1453117] Re: Partitions not recognized because of kernel option CONFIG_ACORN_PARTITION_CUMANA


The issue has also been seen in http://askubuntu.com/questions/638291

I also reproduced it by chance with a SD card configured with an ARM
bootloader located in block 2+. Changing one byte in block #6 restored
the normal behaviour, where all partitions are correctly detected.

The issue did not exist in Trusty, it was added in the initial kernel
configuration for Utopic and still exists in Vivid.

** Attachment added: "Restore the configuration from Trusty"

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  Partitions not recognized because of kernel option

Status in linux package in Ubuntu:

Bug description:
  I am having trouble installing Ubuntu on a newly built system (M/B: Gigabyte B85M-HD3, SSD: Transcend 370 128GB)
  The disk was partitioned with Windows installer (Windows 7) with the legacy BIOS (MBR) setting
  However the two partitions created by Windows are seen as corrupt by Ubuntu installer disk.
  ls /dev/sda* only shows "/dev/sda  /dev/sda1" and not /dev/sda2 (sda1 is windows boot partition and sda2 its main partition)
  gparted says /dev/sda1 is lacking NTFS signature and /dev/sda2 doesn't exist

  This behavior appears in both Ubuntu 15.04 and 14.04.2
  Both partitions are correctly recognized and mounted by every other linux distribution I have tried (Arch installer of April 2015, Linux Mint 17.1, Crunchbang). Windows works fine as well.

  A relevant fragment from dmesg:
  [ 3.326601] sd 0:0:0:0: [sda] 250069680 512-byte logical blocks: (128 GB/119 GiB)
  [ 3.326680] sd 0:0:0:0: [sda] Write Protect is off
  [ 3.326683] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
  [ 3.326705] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  [ 3.327072] sda: [CUMANA/ADFS] sda1 [ADFS] sda1
  [ 3.327076] sda: partition table partially beyond EOD, enabling native capacity
  [ 3.340753] sda: [CUMANA/ADFS] sda1 [ADFS] sda1
  [ 3.340754] sda: partition table partially beyond EOD, truncated
  [ 3.340756] sda: p1 size 4067027304 extends beyond EOD, truncated
  [ 3.340929] sd 0:0:0:0: [sda] Attached SCSI disk

  I compared this to dmesg I get from booting Arch installer and the lines about "partition table partially beyond EOD, truncated" don't appear there. Instead I see something like
  [ 3.448351] sda: sda1 sda2
  [ 3.448597] sd 0:0:0:0: [sda] Attached SCSI disk
  and the partitions are recognized

  Output of fdisk -l
  Disk /dev/sda: 119.2 GiB, 128035676160 bytes, 250069680 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: dos
  Disk identifier: 0xe4e835e9

  Device     Boot  Start       End   Sectors   Size Id Type
  /dev/sda1  *      2048    206847    204800   100M  7 HPFS/NTFS/exFAT
  /dev/sda2       206848 250066943 249860096 119.1G  7 HPFS/NTFS/exFAT

  Found this: https://bugzilla.kernel.org/show_bug.cgi?id=4054

  "This is a consequence of enabling CONFIG_ACORN_PARTITION_CUMANA:
  a 1 in 256 probability of getting any random partition recognized

  I don't think this option is relevant to Ubuntu installations, would
  you consider disabling it?

  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
   /dev/snd/controlC2:  ubuntu     1882 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1882 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1882 F.... pulseaudio
  CasperVersion: 1.360
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.04
   eth0      no wireless extensions.
   lo        no wireless extensions.
  LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Gigabyte Technology Co., Ltd. B85M-HD3
  Package: linux (not installed)
   PATH=(custom, no user)
   0 nouveaufb
   1 inteldrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  Tags:  vivid
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.19.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/19/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FF
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: B85M-HD3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFF:bd06/19/2014:svnGigabyteTechnologyCo.,Ltd.:pnB85M-HD3:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnB85M-HD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: B85M-HD3
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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