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Yunus Shaikh
187e5fc0ac
Guest threads run on host stacks that Windows reserves (0x210000 bytes by default) and commits on demand. Resident Evil Village protects one thread's whole host stack with 0xc2 at startup while its lowest 0xd000 bytes are still only reserved, so the Windows mprotect emulation threw. When such a stack sat inside the arena bounds as a host region, the call took the arena commit path and failed to split a placeholder that was never one. Commit the reserved pages of a host range before protecting it, and only use the arena commit for ranges the arena owns.