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Afaik fork does only work on Unix/Linux systems. A fork does make a copy of an entire process. Typically used when a fast, stable and state secure undo is needed (child/parent processes). In the case of executing a script, it could be that the program tries to fork to recover from possible crashes or endless loops that are caused by executing the script. So if forking the process doesn't work, then one has to assume that the running process is bigger as the available memory that is left (including swap file). If this is not the case I strongly assume a software bug.
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