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That's correct and any of the various MS runtime libraries simply set it by default if you didn't. Thus this error[1] (in C) and this[2] (in VB).

I remember these from pre-dotNet days but based on the second link it looks not much has changed in VB.net.

[1]https://msdn.microsoft.com/en-us/library/aa264523(v=vs.60).a... [2]https://docs.microsoft.com/en-us/dotnet/visual-basic/languag...

The reservation is not particularly relevant though.

So how does it detect stack overflows past that limit?

Edit: Looks like a fix for LLVM being proposed (https://reviews.llvm.org/D9653) is just to probe every page that a stack allocation covers, rather than just the final one. Doesn't sound tough at all.