oracle linux¿¡¼­ bash child setpgid operation not permitted ¹®Á¦

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oracle linux 5.11에서

[root@kd246 /]# ls | grep
-bash: child setpgid (9978 to 9973): Operation not permitted
-bash: child setpgid (9979 to 9973): Operation not permitted
-bash: child setpgid (9980 to 9973): Operation not permitted
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.


pipe로 명령을 내리면 해당 에러메세지가 출력되는데

정확한 해결법을 모르겠네요...
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