group.of.nepali.translators team mailing list archive

[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

https://lists.ubuntu.com/archives/kernel-team/2017-January/081798.html

** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Yakkety)
       Status: New => In Progress

** Changed in: linux (Ubuntu Yakkety)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Zesty)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Zesty)
     Assignee: Taco Screen team (taco-screen-team) => (unassigned)

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1655420

Title:
  Ubuntu - ibmveth: abnormally large TCP MSS value caused a TCP session
  to hang with a zero window

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:
  == Comment: #0 - THOMAS L. FALCON - 2017-01-10 11:54:24 ==

  This bug is being mirrored for any distributions that include ibmveth
  large send/receive support.  In short, any distribution with ibmveth
  v1.05 will be affected (releases 14.04.5/Wily+)

  2 upstream commits:

  1. Set GSO size and type
  https://github.com/torvalds/linux/commit/7b5967389f5a8dfb9d32843830f5e2717e20995d
  2. set GSO segments
  https://github.com/torvalds/linux/commit/94acf164dc8f1184e8d0737be7125134c2701dbe

  A VIOS fix is needed as well.

  ---Problem Description---
  When ibmveth interface on a PowerVM logical partition received a large, aggregated packet from firmware, the gso fields in the socket buffer shared info were not filled in correctly.  This surfaced in a bug where the TCP rx window calculation algorithm returned a Zero Window even when there was available space.

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