Hadoop QA commented on YARN-2809:

{color:green}+1 overall{color}.  Here are the results of testing the latest 
  against trunk revision 61a2510.

    {color:green}+1 @author{color}.  The patch does not contain any @author 

    {color:green}+1 tests included{color}.  The patch appears to include 1 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/5934//console

This message is automatically generated.

> 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.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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