[Bug 1498697] Re: Targets are not consistently shown with large numbers of targets

Eric Desrochers eric.desrochers at canonical.com
Fri Sep 25 13:16:17 UTC 2015 

debdiff for Precise

** Changed in: tgt (Ubuntu Precise)
       Status: New => In Progress

** Changed in: tgt (Ubuntu Precise)
   Importance: Undecided => Medium

** Changed in: tgt (Ubuntu Precise)
     Assignee: (unassigned) => Eric Desrochers (eric-desrochers-z)

** Patch added: "debdiff for Precise"
   https://bugs.launchpad.net/ubuntu/vivid/+source/tgt/+bug/1498697/+attachment/4474355/+files/lp1498697_precise.debdiff

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https://bugs.launchpad.net/bugs/1498697

Title:
  Targets are not consistently shown with large numbers of targets

Status in tgt package in Ubuntu:
  New
Status in tgt source package in Precise:
  In Progress
Status in tgt source package in Trusty:
  In Progress
Status in tgt source package in Vivid:
  In Progress

Bug description:
  SRU JUSTIFICATION

  [Impact]

   * tgtadm returns inconsistents results. Some targets are not 
     listed during one run, but are shown by a run immediately after.

  [Test Case]

   * With large number of targets :

  # ./tgtadm -L iscsi --mode target --op show | fgrep -c Target
  564

  # dpkg -l | fgrep tgt
  ii tgt 1:1.0.43-0ubuntu4 amd64 Linux SCSI target user-space tools

  # cat /etc/lsb-release
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=14.04
  DISTRIB_CODENAME=trusty
  DISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS"

  ----
  Buggy 1.0.43 version:

  # for i in {1..100} ; do diff -u <(/usr/sbin/tgtadm -L iscsi --mode target --op show | fgrep Target) <(/usr/sbin/tgtadm -L iscsi --mode target --op show | fgrep Target) ; sleep 1 ; done
  --- /dev/fd/63 2015-09-22 23:05:38.648448562 +0000
  +++ /dev/fd/62 2015-09-22 23:05:38.648448562 +0000
  @@ -560,3 +560,5 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  +Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45
  +Target 581: iqn.2010-10.org.openstack:volume-ddcebcc4-eb13-459e-be1d-2068ee03a4c6
  --- /dev/fd/63 2015-09-22 23:05:40.720506264 +0000
  +++ /dev/fd/62 2015-09-22 23:05:40.720506264 +0000
  @@ -560,3 +560,4 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  +Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45
  --- /dev/fd/63 2015-09-22 23:05:41.752535004 +0000
  +++ /dev/fd/62 2015-09-22 23:05:41.752535004 +0000
  @@ -560,3 +560,5 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  +Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45
  +Target 581: iqn.2010-10.org.openstack:volume-ddcebcc4-eb13-459e-be1d-2068ee03a4c6
  --- /dev/fd/63 2015-09-22 23:05:43.828592816 +0000
  +++ /dev/fd/62 2015-09-22 23:05:43.828592816 +0000
  @@ -560,4 +560,3 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  -Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45

  [Regression Potential]

   * None expected, the patch comes from tgt upstream repo and it is
  already implemented in Ubuntu Wily and Debian.

  [Other Info]
   
   * The fix has been tested by the community and the fix resolved the issue. For more details see Comment #4

  [Original Description]

  With a large number of targets tgtadm --mode target --op show returns
  inconsistent results. Some targets are not listed during one run, but
  are shown by a run immediately after.

  I grabbed the binary from the wily package and I am getting consistent
  results, so somewhere between 1.0.43 and 1.0.57 upstream seems to have
  patched the bug.

  Can we get 1.0.57 (or whatever version has the fix) backported to
  trusty?

  ----
  # ./tgtadm -L iscsi --mode target --op show | fgrep -c Target
  564

  # dpkg -l | fgrep tgt
  ii  tgt                              1:1.0.43-0ubuntu4              amd64        Linux SCSI target user-space tools

  # cat /etc/lsb-release
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=14.04
  DISTRIB_CODENAME=trusty
  DISTRIB_DESCRIPTION="Ubuntu 14.04.1 LTS"

  ----
  Buggy 1.0.43 version:

  # for i in {1..100} ; do diff -u <(/usr/sbin/tgtadm -L iscsi --mode target --op show | fgrep Target) <(/usr/sbin/tgtadm -L iscsi --mode target --op show | fgrep Target) ; sleep 1 ; done
  --- /dev/fd/63	2015-09-22 23:05:38.648448562 +0000
  +++ /dev/fd/62	2015-09-22 23:05:38.648448562 +0000
  @@ -560,3 +560,5 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  +Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45
  +Target 581: iqn.2010-10.org.openstack:volume-ddcebcc4-eb13-459e-be1d-2068ee03a4c6
  --- /dev/fd/63	2015-09-22 23:05:40.720506264 +0000
  +++ /dev/fd/62	2015-09-22 23:05:40.720506264 +0000
  @@ -560,3 +560,4 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  +Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45
  --- /dev/fd/63	2015-09-22 23:05:41.752535004 +0000
  +++ /dev/fd/62	2015-09-22 23:05:41.752535004 +0000
  @@ -560,3 +560,5 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  +Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45
  +Target 581: iqn.2010-10.org.openstack:volume-ddcebcc4-eb13-459e-be1d-2068ee03a4c6
  --- /dev/fd/63	2015-09-22 23:05:43.828592816 +0000
  +++ /dev/fd/62	2015-09-22 23:05:43.828592816 +0000
  @@ -560,4 +560,3 @@
   Target 574: iqn.2010-10.org.openstack:volume-7adaa3bc-fafc-4421-baf7-b25102de1922
   Target 578: iqn.2010-10.org.openstack:volume-892c6840-ca04-4474-9976-9eaa8b54c4d2
   Target 579: iqn.2010-10.org.openstack:volume-d1d8062f-be47-4f33-b5b9-1befdfb09f65
  -Target 580: iqn.2010-10.org.openstack:volume-32a9e401-cf44-4f8f-ba93-fd43ff758e45

  ----
  Working 1.0.57 version:

  # for i in {1..100} ; do diff -u <(./tgtadm -L iscsi --mode target --op show | fgrep Target) <(./tgtadm -L iscsi --mode target --op show | fgrep Target) ; sleep 1 ; done
  #

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