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https://issues.apache.org/jira/browse/HDFS-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568271#comment-16568271
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Wei-Chiu Chuang commented on HDFS-13738:
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Thanks for the patch, the fix looks good to me. Would you also like to 
contribute a test case as well?
For the starter, you can add test methods in TestFsck class.

> fsck -list-corruptfileblocks has infinite loop if user is not privileged.
> -------------------------------------------------------------------------
>
>                 Key: HDFS-13738
>                 URL: https://issues.apache.org/jira/browse/HDFS-13738
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: tools
>    Affects Versions: 2.6.0, 3.0.0
>         Environment: Kerberized Hadoop cluster
>            Reporter: Wei-Chiu Chuang
>            Assignee: Yuen-Kuei Hsueh
>            Priority: Major
>         Attachments: HDFS-13738.001.patch, HDFS-13738.test.patch
>
>
> Found an interesting bug.
> Execute following command as any non-privileged user:
> {noformat}
> # run fsck
> $ hdfs fsck / -list-corruptfileblocks
> {noformat}
> {noformat}
> FSCK ended at Mon Jul 16 15:14:03 PDT 2018 in 1 milliseconds
> Access denied for user systest. Superuser privilege is required
> Fsck on path '/' FAILED
> FSCK ended at Mon Jul 16 15:14:03 PDT 2018 in 0 milliseconds
> Access denied for user systest. Superuser privilege is required
> Fsck on path '/' FAILED
> FSCK ended at Mon Jul 16 15:14:03 PDT 2018 in 1 milliseconds
> Access denied for user systest. Superuser privilege is required
> Fsck on path '/' FAILED
> {noformat}
> Reproducible on Hadoop 3.0.0 as well as 2.6.0



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