# Expected Diagnosis: component-restart-during-query-cancellation

The expected result should converge on the case-specific mechanism below while
keeping conclusions bounded by the collected evidence.

## Expected conclusion

A canceled transaction reached connection-close cleanup and panicked while LazyTxn.Rollback was handling the interrupted query through session.Close and clientConn.Close. This is the query-cancellation rollback cleanup bug tracked by tidb#63956, not a commit-path failure. The remedy is the relevant hotfix or upgrade to v8.5.5 or later.

## Required evidence chain

- Use the panic stack to establish that the process died during rollback and connection cleanup of a canceled transaction.
- Distinguish this path from transaction commit or ordinary OOM behavior.
- Identify the query-cancellation rollback cleanup defect and its process-restart impact.
- Recommend the corresponding hotfix or an upgrade to v8.5.5 or later.