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ERROR_OPLOCK_BREAK_IN_PROGRESS
A file operation completed during an oplock break transition
This status reports a transitional condition: another handle held caching rights, an incompatible operation triggered a break, and the file system is still coordinating that break. The open or create may have completed, but cached assumptions held by the former oplock owner are being invalidated or reduced. It does not by itself mean that file data is corrupt or that the open failed permanently.
Code that observes this result should wait for the associated asynchronous oplock completion or otherwise synchronize before relying on cache coherence. On the oplock-owning side, flush modified data when required and process the returned break information. On the competing-open side, distinguish advisory breaks, which do not block the operation, from breaks that require acknowledgment because a sharing conflict or handle-caching right must be resolved first.
What to inspect
- Identify the handle that owns the breaking oplock.
- Check whether the break is advisory or requires acknowledgment.
- Delay cache-sensitive work until the break transition is complete.
References
- Microsoft: opportunistic lock operations
- Microsoft: oplock types and break behavior
- Microsoft: FSCTL_REQUEST_OPLOCK
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