What does NTSTATUS 0xC0000501 (STATUS_INVALID_TASK_INDEX) mean?

 
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STATUS_INVALID_TASK_NAME STATUS_THREAD_ALREADY_IN_TASK

STATUS_INVALID_TASK_INDEX

The task index does not identify a valid slot

STATUS_INVALID_TASK_INDEX identifies a specific Windows status in the job, task, callback, or isolation path. The supplied task index is outside the current table, generation, or scope. A stale cached index can become invalid after task teardown or reconfiguration.

Record the index together with task-set generation and owning object; reacquire it from the authoritative API.

What to preserve before changing the system

  • The exact API, caller, target object, original NTSTATUS value, and any nested error or activity ID.
  • For STATUS_INVALID_TASK_INDEX, the relevant process token, package/job/enclave identity, lifecycle state, and policy or mitigation settings.
  • For STATUS_INVALID_TASK_INDEX, operational event logs and a timeline showing the first transition into the failing state.

References for STATUS_INVALID_TASK_INDEX


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