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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Vivid)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Vivid)
       Status: New => In Progress

** Changed in: linux (Ubuntu Vivid)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu)
       Status: Confirmed => In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Also affects: linux (Ubuntu Wily)
   Importance: High
     Assignee: Joseph Salisbury (jsalisbury)
       Status: In Progress

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https://bugs.launchpad.net/bugs/1439780

Title:
  [Hyper-V] Fiber Channel critical target error

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  In Progress

Bug description:
  System details:
  Linux version 3.19.0-11-generic (apw@gloin) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu12) ) #11~lp1423343v201503311833 SMP Tue Mar 31 17:40:01 UTC 2015 (Ubuntu 3.19.0-11.11~lp1423343v201503311833-generic 3.19.3)

  Ubuntu 3.19.0-11
  Ubuntu Vivid 15.04 64bit custom kernel
  Platform: WS2012R2

  Using a fiber channel disk partition ( dev/sde1 in this example) outputs the following error:
  ​
  [ 1307.744496] blk_update_request: critical target error, dev sde, sector 0
  [ 1396.052488] blk_update_request: critical target error, dev sde, sector 0
  [ 1456.216570] blk_update_request: critical target error, dev sde, sector 0

  Creating a partition works, reading too, but first time writing it
  hangs for around 20 seconds and after a couple more writes the
  partition goes into read-only mode:

  #echo "test1" > test1.txt
  *hangs for 30 seconds*
  blk_update_request: critical target error, dev sde, sector 0
  # echo "test2" > test2.txt
  blk_update_request: critical target error, dev sde, sector 289671192
  Aborting journal on device sde1-8.
  EXT4-fs error (device sde1): ext4_journal_check_start:56: Detected aborted journal
  EXT4-fs (sde1): Remounting filesystem read-only
  # echo "test string" > sample.txt
  -bash: sample.txt: Read-only file system

  
  Dmesg log:
  [  461.284362] blk_update_request: critical target error, dev sde, sector 0
  [  484.845659] EXT4-fs (sde1): mounted filesystem with ordered data mode. Opts: (null)
  [  548.988377] blk_update_request: critical target error, dev sde, sector 0
  [  609.216340] blk_update_request: critical target error, dev sde, sector 289671192
  [  609.221812] Aborting journal on device sde1-8.
  [  612.237503] EXT4-fs error (device sde1): ext4_journal_check_start:56: Detected aborted journal
  [  612.249529] EXT4-fs (sde1): Remounting filesystem read-only

  Additional info:

  cat /proc/version_signature
  Ubuntu 3.19.0-11.11~lp1423343v201503311833-generic 3.19.3

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