SET GLOBAL innodb_flush_log_at_trx_commit=3; CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=innodb; INSERT INTO t1 VALUES (0); connect con1,localhost,root,,; connect con2,localhost,root,,; connect con3,localhost,root,,; connection con1; SET DEBUG_SYNC= "commit_after_get_LOCK_log SIGNAL con1_waiting WAIT_FOR con3_queued"; SET DEBUG_SYNC= "commit_loop_entry_commit_ordered SIGNAL con1_loop WAIT_FOR con1_loop_cont EXECUTE 3"; INSERT INTO t1 VALUES (1); connection con2; SET DEBUG_SYNC= "now WAIT_FOR con1_waiting"; SET DEBUG_SYNC= "commit_after_prepare_ordered SIGNAL con2_queued"; INSERT INTO t1 VALUES (2); connection con3; SET DEBUG_SYNC= "now WAIT_FOR con2_queued"; SET DEBUG_SYNC= "commit_after_prepare_ordered SIGNAL con3_queued"; INSERT INTO t1 VALUES (3); connection default; SET DEBUG_SYNC= "now WAIT_FOR con1_loop"; SET DEBUG_SYNC= "now SIGNAL con1_loop_cont"; SET DEBUG_SYNC= "now WAIT_FOR con1_loop"; SET DEBUG_SYNC= "now SIGNAL con1_loop_cont"; SET DEBUG_SYNC= "now WAIT_FOR con1_loop"; SELECT * FROM t1 ORDER BY a; a 0 1 2 connection con2; connection default; SET SESSION debug_dbug="+d,crash_dispatch_command_before"; SELECT 1; Got one of the listed errors connection con1; Got one of the listed errors connection con3; Got one of the listed errors connection default; SELECT * FROM t1 ORDER BY a; a 0 1 2 3 InnoDB: Last binlog file './master-bin.000001', position SET DEBUG_SYNC= 'RESET'; DROP TABLE t1;