[Bug 1615694] Re: [860730] Host experiencing constant session termination and recreation while using jumbo frames

[Clayton Skaggs]

I've setup and attempted the reproduction of this defect on debian using
the requested 2.0.874 open-iscsi package. The attempts to reproduce have
been unsuccessful.It seems like this build may have a fix for our issue.

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Title:
  [860730] Host experiencing constant session termination and recreation
  while using jumbo frames

Status in open-iscsi package in Ubuntu:
  Triaged

Bug description:
  We're seeing constant iSCSI session terminations and subsequent
  recreations on Ubuntu 16.04 hosts running IO to an E-Series Array
  using Jumbo Frames. We've pulled trace of the issue to determine a
  root cause and discovered that the host appears to be overrunning the
  Max Command Sequence Number set by the Target. The target is responds
  to this be killing that session and recreating a new one in it's place
  as an error recovery mechanism, so the crux of the issue is why the
  host seems to be falling outside of iSCSI compliance and overrunning
  the Max Command Sequence Number. This is the reason I went ahead and
  filed the bug against open-iscsi.

  Attached are actually two separate traces from two separate recreate,
  one a Finisar Analyzer Trace, the other a typical TCP dump view-able
  through wire-shark. I've also attached the Apport data for open-iscsi
  in case that could be of any use.

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