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ERROR_SHARING_BUFFER_EXCEEDED
Sharing-state resources are exhausted
ERROR_SHARING_BUFFER_EXCEEDED is a legacy system error indicating that Windows cannot track another shared file opening with the available internal resources. It is distinct from a normal sharing violation caused by incompatible access flags.
What to investigate
- Look for unusually large numbers of open file handles.
- Confirm every success path and error path closes handles promptly.
- Check whether a service repeatedly opens the same file instead of reusing a controlled handle.
- Inspect process and system handle counts during the failure period.
Recovery
Release leaked or unnecessary handles and reduce concurrent opens. A delayed retry can succeed after resources are freed, but repeated failures indicate a lifecycle or workload problem. Modern applications should still report this specific condition rather than converting it into a misleading file-not-found message.
References
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