- kernel32!BaseCreateStack() is compatible with ntdll!RtlpCreateUserStack(). - When checking whether a stack guard page can be added, its size has to be accounted for in the checking logic. - We have to satisfy the PEB::MinimumStackCommit constraint. - We cannot use PEB::GuaranteedStackBytes in BaseCreateStack() since it is nowhere initialized (default is 0). It gets initialized to a non-zero value when the user manually calls SetThreadStackGuarantee(). https://www.installsetupconfig.com/win32programming/windowsthreadsprocessapis7_6.html - RtlpCreateUserStack(): Fix memory leak in failure case. - RtlpFreeUserStack() doesn't need to return anything. See also commit 1bc59379 (r59868). CORE-11319