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STATUS_INVALID_OPLOCK_PROTOCOL
The oplock state machine received an invalid acknowledgment
Oplock breaks have a defined request and acknowledgment protocol. A client must acknowledge the break using the state and flags returned by the file system. Reusing an old buffer, acknowledging twice, or replying with an incompatible requested level can violate that protocol.
This status points to state-machine handling rather than ordinary file contention. Preserve the before-and-after oplock levels and the completion ordering around the break.
What to inspect
- Correlate each break notification with exactly one pending oplock request.
- Log OriginalOplockLevel, NewOplockLevel, Flags, and the handle lifetime.
- Check races between cancellation, handle close, and asynchronous acknowledgment.
References
- Microsoft: FSCTL_REQUEST_OPLOCK
- Microsoft: Types of Opportunistic Locks
- Microsoft Open Specifications: NTSTATUS values
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