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[Launchpad Bug Tracker <1632116@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-47.68

---------------
linux (4.4.0-47.68) xenial; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1636941

  * Add a driver for Amazon Elastic Network Adapters (ENA) (LP: #1635721)
    - lib/bitmap.c: conversion routines to/from u32 array
    - net: ethtool: add new ETHTOOL_xLINKSETTINGS API
    - net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)
    - [config] enable CONFIG_ENA_ETHERNET=m (Amazon ENA driver)

  * unexpectedly large memory usage of mounted snaps (LP: #1636847)
    - [Config] switch squashfs to single threaded decode

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Wed, 26 Oct 2016 10:47:55 -0700

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1632116

Title:
  Paths not failed properly when unmapping virtual FC ports in VIOS
  (using ibmvfc)

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  ---Problem Description---
  vios vfc unmap (vfcmap -vadapter vfchost0 -fcp) can result in no i/o being retried nor device offline.
    
  ---uname output---
  Linux ubuntu16 4.4.0-9136-generic #55-Ubuntu SMP Fri Aug 26 05:56:24 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux
   
  Machine Type = Power8 LPAR 
   
  ---Steps to Reproduce---
   Ubuntu 16.10 lpar with two vfc adapters mapped to SAN Storage and configured with mulitpath.
  In vios do:  vfcmap -vadapter vfchost0 -fcp (where vfchost0 maps to test lpar).  multipath -ll and lvm commands hang in linux lpar.  tail /var/log/message hangs sometimes. multipath doesn't see failing devices and doesn't mark paths down.

  
  Fyi ...
  .... the following patch fixes the problem, which is now upstream accepted in the scsi tree as
  http://git.kernel.org/cgit/linux/kernel/git/mkp/scsi.git/commit/?h=for-next&id=07d0e9a847401ffd2f09bd450d41644cd090e81d
  ("scsi: ibmvfc: Fix I/O hang when port is not mapped")

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