Nathan Roberts updated YARN-2809:
    Attachment: YARN-2809-v2.patch

upmerge to latest trunk

> Implement workaround for linux kernel panic when removing cgroup
> ----------------------------------------------------------------
>                 Key: YARN-2809
>                 URL: https://issues.apache.org/jira/browse/YARN-2809
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.6.0
>         Environment:  RHEL 6.4
>            Reporter: Nathan Roberts
>            Assignee: Nathan Roberts
>         Attachments: YARN-2809-v2.patch, YARN-2809.patch
> Some older versions of linux have a bug that can cause a kernel panic when 
> the LCE attempts to remove a cgroup. It is a race condition so it's a bit 
> rare but on a few thousand node cluster it can result in a couple of panics 
> per day.
> This is the commit that likely (haven't verified) fixes the problem in linux: 
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-2.6.39.y&id=068c5cc5ac7414a8e9eb7856b4bf3cc4d4744267
> Details will be added in comments.

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