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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1454158

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1454158

Title:
   When SCSI bus hangs SES driver indefinitely block any process
  accessing LED status for devices

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 14.04, 3.13.0-40-generic

  Configuration:

  SCSI (mpt2sas, 16.100.00.00) with few enclosures with SATA disks.

  Situation:
  One of enclosures is hung and do not reply to any requests (including reset). All sg_* command to any device behind hanged enclosure, including enclosure itself, are stuck in the 'D' state.

  Problem:
  Access to sysfs place processes in 'D' state:

  cat /sys/class/enclosure/5\:0\:46\:0/Slot\ 01/locate

  root       588  0.0  0.0   7152   612 pts/6    D+   08:40   0:00 cat
  /sys/class/enclosure/5:0:46:0/Slot 01/locate

  Proposed solution: Add timeout to ses devices independent of HBA
  driver.

  Rationale: Accessing to sysfs do not expect to be 'real IO' with
  chances to hung in 'D' forever.

  Kernel bugzilla bug: https://bugzilla.kernel.org/show_bug.cgi?id=98121

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