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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 1516269

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/1516269

Title:
  ata NCQ error with md, drbd and high load

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  With Ubuntu wily kernel 4.2.0-18-generic a SyncTarget to a DRBD on LVM
  on MD Raid1 produces errors:

  Nov 14 17:46:20 kobol kernel: [  198.351892] ata1.00: exception Emask 0x60 SAct 0x38 SErr 0x800 action 0x6 frozen
  Nov 14 17:46:20 kobol kernel: [  198.351922] ata1.00: irq_stat 0x20000000, host bus error
  Nov 14 17:46:20 kobol kernel: [  198.351935] ata1: SError: { HostInt }
  Nov 14 17:46:20 kobol kernel: [  198.351944] ata1.00: failed command: WRITE FPDMA QUEUED
  Nov 14 17:46:20 kobol kernel: [  198.351957] ata1.00: cmd 61/48:18:00:d8:95/05:00:07:00:00/40 tag 3 ncq 692224 out
  Nov 14 17:46:20 kobol kernel: [  198.351957]          res 40/00:20:40:e1:95/00:00:07:00:00/40 Emask 0x60 (host bus error)
  Nov 14 17:46:20 kobol kernel: [  198.351988] ata1.00: status: { DRDY }
  Nov 14 17:46:20 kobol kernel: [  198.351997] ata1.00: failed command: WRITE FPDMA QUEUED
  Nov 14 17:46:20 kobol kernel: [  198.352009] ata1.00: cmd 61/40:20:40:e1:95/00:00:07:00:00/40 tag 4 ncq 32768 out
  Nov 14 17:46:20 kobol kernel: [  198.352009]          res 40/00:20:40:e1:95/00:00:07:00:00/40 Emask 0x60 (host bus error)
  Nov 14 17:46:20 kobol kernel: [  198.352039] ata1.00: status: { DRDY }
  Nov 14 17:46:20 kobol kernel: [  198.352047] ata1.00: failed command: WRITE FPDMA QUEUED
  Nov 14 17:46:20 kobol kernel: [  198.352059] ata1.00: cmd 61/80:28:80:e1:95/00:00:07:00:00/40 tag 5 ncq 65536 out
  Nov 14 17:46:20 kobol kernel: [  198.352059]          res 40/00:20:40:e1:95/00:00:07:00:00/40 Emask 0x60 (host bus error)
  Nov 14 17:46:20 kobol kernel: [  198.352090] ata1.00: status: { DRDY }
  Nov 14 17:46:20 kobol kernel: [  198.352099] ata1: hard resetting link
  Nov 14 17:46:20 kobol kernel: [  198.352106] ata2.00: exception Emask 0x60 SAct 0x70000 SErr 0x800 action 0x6 frozen
  Nov 14 17:46:20 kobol kernel: [  198.352133] ata2.00: irq_stat 0x20000000, host bus error
  Nov 14 17:46:20 kobol kernel: [  198.352145] ata2: SError: { HostInt }
  Nov 14 17:46:20 kobol kernel: [  198.352154] ata2.00: failed command: WRITE FPDMA QUEUED
  Nov 14 17:46:20 kobol kernel: [  198.352166] ata2.00: cmd 61/48:80:00:d8:95/05:00:07:00:00/40 tag 16 ncq 692224 out
  Nov 14 17:46:20 kobol kernel: [  198.352166]          res 40/00:88:40:e1:95/00:00:07:00:00/40 Emask 0x60 (host bus error)
  Nov 14 17:46:20 kobol kernel: [  198.352196] ata2.00: status: { DRDY }
  Nov 14 17:46:20 kobol kernel: [  198.352204] ata2.00: failed command: WRITE FPDMA QUEUED
  Nov 14 17:46:20 kobol kernel: [  198.352217] ata2.00: cmd 61/40:88:40:e1:95/00:00:07:00:00/40 tag 17 ncq 32768 out
  Nov 14 17:46:20 kobol kernel: [  198.352217]          res 40/00:88:40:e1:95/00:00:07:00:00/40 Emask 0x60 (host bus error)
  Nov 14 17:46:20 kobol kernel: [  198.352246] ata2.00: status: { DRDY }
  Nov 14 17:46:20 kobol kernel: [  198.352254] ata2.00: failed command: WRITE FPDMA QUEUED
  Nov 14 17:46:20 kobol kernel: [  198.352266] ata2.00: cmd 61/80:90:80:e1:95/00:00:07:00:00/40 tag 18 ncq 65536 out
  Nov 14 17:46:20 kobol kernel: [  198.352266]          res 40/00:88:40:e1:95/00:00:07:00:00/40 Emask 0x60 (host bus error)
  Nov 14 17:46:20 kobol kernel: [  198.352295] ata2.00: status: { DRDY }
  Nov 14 17:46:20 kobol kernel: [  198.352304] ata2: hard resetting link
  Nov 14 17:46:21 kobol kernel: [  198.671678] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
  Nov 14 17:46:21 kobol kernel: [  198.673618] ata2.00: configured for UDMA/133
  Nov 14 17:46:21 kobol kernel: [  198.673628] ata2: EH complete
  Nov 14 17:46:21 kobol kernel: [  198.727651] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
  Nov 14 17:46:21 kobol kernel: [  198.735336] ata1.00: configured for UDMA/133
  Nov 14 17:46:21 kobol kernel: [  198.735343] ata1: EH complete

  The error didn't show up before the update from kernel 4.2.0-16-generic.
  Disabling NCQ with 
   echo 1 > /sys/block/sda/device/queue_depth
  is a workaround.

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