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

[Nish Aravamudan]

Hi Clayton, sorry for the long delay on my part!

I think at this point, we need to ask upstream open-iscsi
(https://github.com/open-iscsi/open-iscsi/issues) about possible bugs in
their code.

They probably will ask you be running directly from github's sources
(rather than the package) -- are you able to build from source locally?
If we can get a fix from upstream narrowed down, I can help you get it
backported for SRU.

Thanks,
Nish

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https://bugs.launchpad.net/bugs/1615694

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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