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--source include/have_debug_sync.inc
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CREATE TABLE t (a int, b int) ENGINE=MyISAM;
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INSERT INTO t VALUES (1,10),(2,20);
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SET debug_sync= 'alter_table_online_progress WAIT_FOR goforit';
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--send
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ALTER TABLE t ADD c INT, ALGORITHM=COPY, LOCK=NONE;
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--connect (con1,localhost,root,,)
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UPDATE t SET b = 100;
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START TRANSACTION;
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UPDATE t SET b = 200;
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--connect (con2,localhost,root,,)
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DELETE FROM t ORDER BY a LIMIT 1;
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DELETE FROM t ORDER BY a LIMIT 1;
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--connection con1
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COMMIT;
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SET debug_sync= 'now SIGNAL goforit';
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--connection default
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--reap
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# Cleanup
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DROP TABLE t;
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--disconnect con2
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--disconnect con1
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bb-11.0-oalter 90cf6464fae
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mysqltest: At line 24: query 'reap' failed: ER_KEY_NOT_FOUND (1032): Can't find record in 't'
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error log
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2023-04-13 1:51:44 4 [ERROR] mariadbd: Can't find record in 't'
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2023-04-13 1:51:44 4 [ERROR] Slave SQL: Could not execute Delete_rows_v1 event on table test.t; Can't find record in 't', Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event's master log FIRST, end_log_pos 112, Internal MariaDB error code: 1032
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Reproducible with at least MyISAM and Aria. The test case is not directly applicable to InnoDB, it hits innodb_lock_wait_timeout instead. I didn't try to modify it for InnoDB.
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