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872f302b8d
When one thread tries to compile a script, another thread may already be executing JITed code. In this case we can't make the memory non-executable. This violates the W^X principle, but doesn't seem to be avoidable for ZTS builds for now. The same problem does not exist for NTS, as it's a different process executing there, which has it's own memory protection mapping. Closes GH-6595.