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ERROR_WAIT_FOR_OPLOCK
The file operation is waiting for an oplock owner to respond
Windows can hold an open or other conflicting file operation while it notifies an oplock owner that its caching rights must be reduced or removed. This status identifies that wait. The delay is normally caused by coordination with another handle, not by disk latency, network throughput, or an ordinary mutex held by the calling thread.
Find the pending oplock DeviceIoControl request and the process or redirector that owns it. The owner may need to flush cached writes, close its handle, or acknowledge a requested lower level. Long waits often indicate that the owner is not servicing overlapped completions, is blocked in application code, or lost the handle lifecycle. Capture stack traces for both the waiting operation and the oplock completion path before forcing a retry.
What to inspect
- Trace the pending FSCTL_REQUEST_OPLOCK completion.
- Check whether the owner thread processes overlapped I/O promptly.
- Avoid blind retries that create additional blocked opens.
References
- Microsoft: opportunistic lock operations
- Microsoft: oplock types and break behavior
- Microsoft: FSCTL_REQUEST_OPLOCK
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