NTSTATUS 0xC000002C (STATUS_UNABLE_TO_DECOMMIT

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The caller attempted to decommit pages that are not committed in the required way.

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STATUS_PARITY_ERROR	STATUS_NOT_COMMITTED

STATUS_UNABLE_TO_DECOMMIT_VM

The decommit range does not describe committed private pages

Decommit removes committed backing while preserving the surrounding reservation. The range must belong to a compatible private allocation; section views and image mappings follow different lifecycle rules. Current NtFreeVirtualMemory documentation explicitly allows a decommit range to include already uncommitted pages, so this status should not be explained by that condition alone.

If this status is observed, preserve the exact native call and operating-system context. Check invalid flags, range overflow, incompatible mapping type, or an internal/legacy path whose contract differs from documented NtFreeVirtualMemory. Do not invent a retry rule from the status name alone.

What to inspect

Query every region crossed by the requested range and verify state and allocation base.
Check page rounding so the call does not include an adjacent uncommitted page.
Audit rollback and destruction paths for duplicate decommit operations.

References

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