linux - Permission denied for ANY task at root's crontab -

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i have (and this) @ root crontab

    * * * * *  /bin/true

tail /var/log/cron.log lists

    sep 13 19:53:01 host cron[9881]: permission denied     sep 13 19:54:01 host cron[9882]: permission denied     sep 13 19:55:01 host cron[9890]: permission denied     sep 13 19:56:02 host cron[9891]: permission denied

before asks:

    # ls -l /bin/true     -rwxr-xr-x 1 root root 27280 mar  2  2017 /bin/true

no matter task command, "permission denied" , nothing executed, obviously.

any comments?


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