Ah! It appears to originate from Net::OpenSSH. (Thanks Google)

Anyway, it's a fair warning. Programs expect to be provided a STDIN, STDOUT and STDERR, and you don't provide them. Don't close them. Instead, redirect them to /dev/null.

In reply to Re^2: Can't close STDIN/STDOUT/STDERR by ikegami
in thread Can't close STDIN/STDOUT/STDERR by brp4h

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