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ERROR_ABANDONED_WAIT_63
Abandoned mutex at wait index 63
ERROR_ABANDONED_WAIT_63 is Windows system result 736 (0x000002E0). It combines abandoned ownership semantics with the upper indexed-wait boundary.
This result means the sixty-fourth object is a mutex whose owner terminated without releasing it. Diagnosis must validate both the abandoned protected state and the correctness of index 63 mapping.
Where this value belongs
- A sharded coordinator waits on 64 mutexes and the final shard owner exits.
- A maximum-size wait set reports abandoned ownership for its last element.
- Boundary tests exercise the upper abandoned-wait marker.
With it, a wrong count or shard map can cause repair of the wrong resource. The recorded array generation and shard identity are therefore as important as the mutex status.
Common interpretation mistakes
- It is mishandled when the last mutex is omitted from the shard-to-index map.
- It is mishandled when an off-by-one check rejects or misroutes index 63.
- It is mishandled when repair code assumes the abandoned object is index 0.
- It is mishandled when the sixty-fourth resource is modified before its journal is inspected.
Diagnostic sequence
- Confirm the producing wait contained 64 objects and used wait-any semantics.
- Map index 63 to the exact mutex and protected shard.
- Identify the terminated owner of that mutex.
- Validate only the affected shard before broad recovery.
- Check the final entries of all parallel arrays for off-by-one allocation errors.
- Complete or roll back the interrupted shard update before releasing ownership.
Evidence worth keeping
- preserve array generation and total count.
- preserve index-63 mutex and shard identifier.
- preserve previous owner crash or termination event.
- preserve shard journal and integrity check.
- preserve capacity and last-element initialization for all tables.
It is a strong boundary test: a correct implementation must preserve abandoned-mutex semantics without losing the final index.
Correct handling and recovery
Acquire and quarantine the index-63 resource, validate its journal, repair the final shard, and release the mutex only when its invariants are demonstrably restored.
The coordinator may return to its wait loop after shard 63 is consistent. A failed recovery should leave an explicit unavailable state rather than repeatedly acquiring the abandoned mutex.
Difference from nearby values
ERROR_ABANDONED_WAIT_0 concerns the first mutex and simpler mapping. It additionally tests the maximum array boundary and final shard metadata.
Practical scenario
The owner of shard 63 crashes during compaction. The successor receives it, verifies that the count is 64, restores that shard from its generation journal, and leaves the other 63 shards untouched.
Implementation guidance
Use one source of truth for handle, shard, and recovery-handler arrays. Boundary tests must terminate the owner of the last mutex deliberately and verify isolated recovery.
Record abandoned_63_count, abandoned_63_shard, abandoned_63_owner, abandoned_63_generation, and abandoned_63_repair_result.
References
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