Hrm, that actually makes the issue tricky to solve. I don't have any Windows machines to work with, so I can't test, and I'm not very familiar with using Go on Windows in general, but is it possible to specify delayed load of the DLLs? That should allow the main Go system to get fully initialized (and allocate the chunk of memory it needs) before loading the DLLs needed for the cgo portions.
Nobody is using cgo, it's the system DLLs which get loaded in the middle of the address space. This is very very unusual, Windows tries hard to avoid such things.
It could be solved by making the initial virtual address space reservation in the PE header, not requesting it in the initialization path, that would always work, even with cgo.
