[ 
https://issues.apache.org/jira/browse/YARN-2809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309343#comment-14309343
 ] 

Hadoop QA commented on YARN-2809:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12697032/YARN-2809-v2.patch
  against trunk revision 1425e3d.

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

    {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 
eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 2 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 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager.

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/6535//testReport/
Findbugs warnings: 
https://builds.apache.org/job/PreCommit-YARN-Build/6535//artifact/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-nodemanager.html
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/6535//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-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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