group.of.nepali.translators team mailing list archive

[Luis Henriques <luis.henriques@xxxxxxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1643797

Title:
  System stalls when creating device node on booting

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  We've found on some Apollo Lake system stalls for around 4 seconds on
  function `wait_for_completion` when creating nodes in devtmpfs. With
  70+ nodes created it can be stalled for 5+ minutes when booting.

  With bisecting we've found the patch can fix this issue:

  commit 0905f04eb21fc1c2e690bed5d0418a061d56c225
  Author:     Yuyang Du <yuyang.du@xxxxxxxxx>
  AuthorDate: Thu Dec 17 07:34:27 2015 +0800
  Commit:     Ingo Molnar <mingo@xxxxxxxxxx>
  CommitDate: Wed Jan 6 11:06:29 2016 +0100

      sched/fair: Fix new task's load avg removed from source CPU in
  wake_up_new_task()

  This patch can be clean picked, and shows positive result on multiple
  Apollo Lake system. The patch is already in v4.5+ so Yakkety is not
  affected.

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