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------- Comment From bjking1@xxxxxxxxxx 2015-02-06 17:15 EDT-------
(In reply to comment #9)
> Is it safe to assume that this patch is:
> Fixes: bcdb247c6b6a1f3e72b9b787b73f47dd509d17ec ?

Yes. 3a9794d32984b67a6d8992226918618f0e51e5d5 fixes a regression
introduced by bcdb247c6b6a1f3e72b9b787b73f47dd509d17ec.

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https://bugs.launchpad.net/bugs/1418339

Title:
  kernel set the wrong max_sectors_kb for 4K disks(sd.c)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  [Impact]
  Problem Description
  ===========================
  We get following error messages on the console and IO fails.

  [   63.322503] sd 0:2:2:0: [sdc]
  [   63.322603] Result: hostbyte=DID_ERROR driverbyte=DRIVER_SENSE
  [   63.322661] sd 0:2:2:0: [sdc]
  [   63.322697] Sense Key : Illegal Request [current]
  [   63.322757] sd 0:2:2:0: [sdc]
  [   63.322792] Add. Sense: Invalid field in cdb
  [   63.322839] sd 0:2:2:0: [sdc] CDB:
  [   63.322874] Write(10): 2a 00 03 02 17 a0 00 00 80 00
  [   63.323038] blk_update_request: critical target error, dev sdc, sector 403750144
  [   63.323117] sd 0:2:2:0: [sdc]
  [   63.323152] Result: hostbyte=DID_ERROR driverbyte=DRIVER_SENSE
  [   63.323210] sd 0:2:2:0: [sdc]
  [   63.323245] Sense Key : Illegal Request [current]
  [   63.323303] sd 0:2:2:0: [sdc]
  [   63.323338] Add. Sense: Invalid field in cdb
  [   63.323385] sd 0:2:2:0: [sdc] CDB:
  [   63.323420] Write(10): 2a 00 03 02 17 20 00 00 80 00
  [   63.323580] blk_update_request: critical target error, dev sdc, sector 403749120

  [  138.410612] EXT4-fs warning (device dm-2): ext4_end_bio:317: I/O error -121 writing to inode 265776 (offset 0 size 393216 starting block 33920)
  [  138.410727] Buffer I/O error on device dm-2, logical block 33920
  [  138.410785] Buffer I/O error on device dm-2, logical block 33921
  [  138.410842] Buffer I/O error on device dm-2, logical block 33922
  [  138.410900] Buffer I/O error on device dm-2, logical block 33923
  [  138.410957] Buffer I/O error on device dm-2, logical block 33924

  ---uname output---
  Ubuntu 15.04

  Machine Type = P8(Alpine)

  [Test Case]
  Steps to Reproduce
  =====================
   read/write to a 4K array.

  [Fix]
  commit 3a9794d32984b67a6d8992226918618f0e51e5d5 upstream

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