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STATUS_GRAPHICS_UNSWIZZLING_APERTURE_UNAVAILABLE
A specialised CPU-access path is exhausted
Some WDDM allocations are swizzled and need special video-memory-manager support when they are locked for CPU access. This status says the required unswizzling aperture is currently unavailable; it is not a generic out-of-memory result and does not imply that the allocation handle is invalid.
Inspect aperture ownership and contention
Record the allocation flags, aperture segment, current mappings, CPU-access request, and the operations holding comparable ranges. Check whether the allocation can use a supported staging or copy path. Retrying without releasing aperture pressure is unlikely to change the result.
References
- Microsoft: allocation flags for swizzled allocations
- Microsoft: GPU segments and aperture mappings
- Microsoft: NTSTATUS reference
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