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STATUS_THREAD_ALREADY_IN_TASK
The thread is already associated with a task
STATUS_THREAD_ALREADY_IN_TASK identifies a specific Windows status in the job, task, callback, or isolation path. 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.
What to preserve before changing the system
- The exact API, caller, target object, original NTSTATUS value, and any nested error or activity ID.
- the relevant process token, package/job/enclave identity, lifecycle state, and policy or mitigation settings.
- operational event logs and a timeline showing the first transition into the failing state.
References
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