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[Bug 1720228] Re: User reports excessive ALUA retry messages

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Date: Mon, 16 Oct 2017 13:11:14 -0000
Reply-to: Bug 1720228 <1720228@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1720228

Title:
  User reports excessive ALUA retry messages

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  New

Bug description:
   SRU Justification:

      Impact:
  User reports excessive ALUA messages on Ubuntu Trusty, kernel Ubuntu-lts-4.4.0-91.114_14.04.1
  Messages appear after a LUN disappears and there are hundreds of them flooding the log...

  [263095.795873] sd 3:0:0:129: alua: rtpg retry
  [263095.795874] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.795876] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported

  This causes an intense requeing of the ALUA work queue for 60 seconds
  and it floods the kernel log

  
      Fix:
  UBUNTU: scsi: fixe excessive ALUA (LP: #1720228)
      
  BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1720228

  The err value was initialized to 0 to prevent random assignemtn
  the fix is a cherry-pick from linus tree a4bd85203190990ad808abbd4a5dc848a950002c

  
      Testcase:
  User reports issue when a network iscsi disk gets disconnected.

  
      Original Bug Text:

  User reports excessive ALUA messages on Ubuntu Trusty, kernel Ubuntu-
  lts-4.4.0-91.114_14.04.1

  Messages appear after a LUN disappears and there are hundreds of them
  flooding the log...

  [263095.795873] sd 3:0:0:129: alua: rtpg retry
  [263095.795874] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.795876] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.795961] sd 3:0:0:129: alua: rtpg retry
  [263095.795962] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.795964] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796049] sd 3:0:0:129: alua: rtpg retry
  [263095.796052] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796054] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796140] sd 3:0:0:129: alua: rtpg retry
  [263095.796142] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796143] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796224] sd 3:0:0:129: alua: rtpg retry
  [263095.796226] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796227] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796473] sd 3:0:0:129: alua: rtpg retry
  [263095.796475] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796476] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796604] sd 3:0:0:129: alua: rtpg retry
  [263095.796606] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796607] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796691] sd 3:0:0:129: alua: rtpg retry
  [263095.796693] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796694] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796778] sd 3:0:0:129: alua: rtpg retry
  [263095.796780] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796781] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796868] sd 3:0:0:129: alua: rtpg retry
  [263095.796869] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796871] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.796951] sd 3:0:0:129: alua: rtpg retry
  [263095.796953] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.796954] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797034] sd 3:0:0:129: alua: rtpg retry
  [263095.797035] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797037] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797117] sd 3:0:0:129: alua: rtpg retry
  [263095.797119] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797120] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797202] sd 3:0:0:129: alua: rtpg retry
  [263095.797203] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797205] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797288] sd 3:0:0:129: alua: rtpg retry
  [263095.797289] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797290] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797387] sd 3:0:0:129: alua: rtpg retry
  [263095.797388] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797390] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797470] sd 3:0:0:129: alua: rtpg retry
  [263095.797471] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797472] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797562] sd 3:0:0:129: alua: rtpg retry
  [263095.797563] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797564] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported
  [263095.797652] sd 3:0:0:129: alua: rtpg retry
  [263095.797653] sd 3:0:0:129: [alua] Sense Key : Illegal Request [current]
  [263095.797654] sd 3:0:0:129: [alua] Add. Sense: Logical unit not supported

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