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STATUS_ARBITRATION_UNHANDLED
Resource arbitration continues at the parent bus
PnP resource assignment can involve nested arbiters. A child-bus arbiter may understand only a translated subset of I/O ports, memory windows or interrupt routes. This warning indicates that it did not make the allocation locally and expects the parent hierarchy to arbitrate the request.
It is not by itself a final resource conflict. Diagnosis should follow the requirements list through parent translation and assignment. A driver that converts this intermediate result into a generic failure can prevent valid bridge-window or interrupt routing decisions from reaching the arbiter that has enough scope.
What to inspect
- Inspect the devnode parent chain and which arbiter returned the status.
- Compare raw child requirements with the translated parent resource space.
- Look for an eventual conflict or assignment result rather than treating the defer status as final.
References
- Microsoft: Introduction to Plug and Play
- Microsoft: Hardware resources
- Microsoft: Filtering device resource requirements
- Microsoft Open Specifications: NTSTATUS values
- ReactOS source: PnP device action processing
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