NTSTATUS 0xC0000909 (STATUS_CANNOT_BREAK

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The operation would require an oplock break, but the caller explicitly prohibited breaking oplocks.

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STATUS_BAD_MCFG_TABLE	STATUS_BAD_KEY

STATUS_CANNOT_BREAK_OPLOCK

The requested action conflicts with an existing oplock and must not break it

Some file-system operations provide a “do not break oplocks” semantic so callers can test or perform work only when cached state remains undisturbed. This status means an incompatible oplock exists and honoring the caller’s restriction prevents the operation.

It is not equivalent to a generic sharing violation. The caller deliberately chose atomic failure over triggering the break. Recovery depends on whether that guarantee is essential.

What to inspect

Identify the option or FSCTL that requested no-oplock-break behavior.
Record the existing oplock owner and level if available through tracing.
Retry without the restriction only when the application can tolerate notifying the oplock owner and waiting for break processing.

References

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