Olaf Flebbe updated YARN-2847:
    Attachment: YARN-2487.04.trunk.patch

Merged test from YARN-3810, cleaned up whitespace errors. Ready for review.

> Linux native container executor segfaults if default banned user detected
> -------------------------------------------------------------------------
>                 Key: YARN-2847
>                 URL: https://issues.apache.org/jira/browse/YARN-2847
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.5.0
>            Reporter: Jason Lowe
>            Assignee: Chang Li
>         Attachments: YARN-2487.04.trunk.patch, yarn2847.patch, 
> yarn2847.patch, yarn2847notest.patch
> The check_user function in container-executor.c can cause a segmentation 
> fault if banned.users is not provided but the user is detected as one of the 
> default users.  In that scenario it will call free_values on a NULL pointer.

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