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ERROR_CANT_TERMINATE_SELF
What this result means
ERROR_CANT_TERMINATE_SELF is a Windows system result. Windows rejected a termination request because the calling thread attempted a self-termination pattern that the relevant API or subsystem does not permit.
Why it can appear
- cleanup code targets the current thread through an API intended for another thread
- a debugger or compatibility layer issues termination in the wrong context
- thread identifiers were reused or resolved incorrectly
- shutdown logic confuses cooperative cancellation with forced termination
Troubleshooting steps
- Log caller and target thread IDs, process IDs, handles, and access rights
- Verify whether the target handle refers to the current thread
- Inspect shutdown ordering and thread-ID reuse
- Capture the API contract and whether termination is being requested from a callback or exception handler
Correct recovery and handling
Use cooperative cancellation: signal the worker, let it release resources, and return normally. Forced termination should be reserved for exceptional containment because it can leave locks, heap state, and application invariants damaged.
Related and easily confused conditions
This is not the same as access denied. Even a sufficiently privileged caller may be forbidden from using a particular self-termination route.
References
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