It is Strawberry Perl 5.24.0 (64-bit) on Windows 7 and Windows 10.

My Windows 7 laptop does not experience any issues, but some other Windows 7 systems and a Windows 10 test system I have do. Each of the systems that experience issues have SSD drives. So far that has been the only thing we have found in common with the failing systems.

I tried with an old 5.16.3 Version of perl I had on my system and the warnings go away. So somewhere between 5.16.3 and 5.24.0 the changes with threading have added logic that is attempting to close some of my handles or at least is warning about failing.

Here are those warnings

Warning: unable to close filehandle $errwrite properly: Bad file descr
+iptor at tshoot.pl line 34.
Warning: unable to close filehandle $outwrite properly: Bad file descr
+iptor at tshoot.pl line 34.
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Testing with 5.16.3 on a system that experiences failures, it still fails, but without the "unable to close filehandle" warning messages.