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ERROR_NOT_OWNER
The caller does not own the synchronization object
ERROR_NOT_OWNER typically occurs when a thread releases a mutex or performs an ownership-sensitive operation without being the current owner. It usually indicates incorrect synchronization or cleanup ordering.
What to check
- Record the thread that acquired and released the object.
- Check exception and early-return paths for duplicate release.
- Do not transfer thread-affine ownership implicitly between worker threads.
- Use scoped synchronization wrappers where possible.
How to handle it
Fix the ownership protocol rather than ignoring the error. Continuing after an invalid release can leave shared state permanently blocked or inconsistently protected.
References
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