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

[Clayton Skaggs]

Hi Christian, sorry for the delay. We did make an attempt to go back and
build from down stream at one point but without much success. We did go
ahead and pick up and qualify Ubuntu 18.04 however and are happy to
report that the issue appears to be fixed there with the inbox iscsi
package 2.0.874-5ubuntu2. I'll attempt to rerun 16.04 with this build
here in the near future to see if that doesn't do the trick.

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

Status in open-iscsi package in Ubuntu:
  Incomplete

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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