But the OP has duplicated the file handle in both cases.

I have tried with 5.8.8 (redhat build) and 5.10.0 (default build) on Linux. Neither waits on the sub-process - neither hangs. But the OP says 5.10 hangs with either form. If it is hanging waiting for the sub-process, then something very different is happening.

So, question for the OP: who's build and on what platform are you seeing this?

In reply to Re^4: Variable triggers global destruction hang by ig
in thread Variable triggers global destruction hang by saintmike

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