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ERROR_INVALID_OPLOCK_PROTOCOL
The oplock request or break acknowledgment used an invalid state transition
Oplock handling is a state machine. After a break notification, the owner may need to acknowledge the break and can sometimes request a replacement level. This error indicates that the acknowledgment, flags, requested replacement level, or request ordering did not correspond to the oplock currently associated with the handle. It is therefore different from a simple refusal caused by another opener.
Inspect the exact REQUEST_OPLOCK_INPUT_BUFFER and the completion information returned for the pending DeviceIoControl call. Do not reuse a buffer whose StructureVersion, StructureLength, flags, or requested level belongs to another request. Also verify that only the component owning the oplock performs the acknowledgment and that the handle was not closed, duplicated into an unexpected lifecycle, or switched before the acknowledgment was issued.
What to inspect
- Log every request, break notification, and acknowledgment in sequence.
- Compare requested and acknowledged levels with the returned NewOplockLevel.
- Do not retry an identical malformed acknowledgment without resetting state.
References
- Microsoft: opportunistic lock operations
- Microsoft: oplock types and break behavior
- Microsoft: FSCTL_REQUEST_OPLOCK
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