What does NTSTATUS 191 (STATUS_ABANDONED_WAIT_63) mean?

STATUS_ABANDONED_WAIT_63

The mutex at wait index 63 was abandoned

This status is the high named boundary of the abandoned-wait range and identifies mutex index 63. As with other abandoned mutex results, ownership transfers to the waiter even though the previous owner disappeared without a normal release. The status therefore carries both an index and a consistency warning.

Decode the index against the original handle array before inspecting protected state. In systems that build wait arrays dynamically, record a stable object name or internal identifier with each handle; the number 63 alone is not enough after the array has been rebuilt. If the mutex guards on-disk or cross-process state, perform the component's documented recovery before resuming normal writes.

What to inspect

• Map offset 63 to the exact mutex from the original wait call.
• Check whether the previous owner crashed, was forcibly terminated, or exited during cleanup.
• Run state validation or journal recovery before accepting protected data as consistent.

References

• Microsoft: WaitForMultipleObjects
• Microsoft: Mutex objects
• Microsoft Open Specifications: NTSTATUS values

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