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STATUS_THREAD_ALREADY_IN_TASK
The thread is already associated with a task
Windows returns STATUS_THREAD_ALREADY_IN_TASK while handling job, task, callback, or isolation state. A join operation was repeated or attempted against a second task while the thread still belongs to the first. Nested membership is not implied by thread reuse.
Track join/leave balance, thread-pool reuse and exception paths that skip cleanup. Do not force-clear internal task state.
A second association usually indicates unbalanced task membership or thread reuse. Record both the existing task and the requested task so the missing leave operation or stale association can be located.
References
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