This doesn't excuse not telling us what $dir contains (or even rule it out), but it seems the error is coming from Perl code, not from the shell. That's most curious, and I'm wondering about a false positive. But since you didn't provide us the code that issues the error, can't tell.

In reply to Re^2: invoke shell with `` failed by ikegami
in thread invoke shell with `` failed by jiangliguo

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