SET GLOBAL max_binlog_size= 4096; SET GLOBAL innodb_flush_log_at_trx_commit= 1; RESET MASTER; CREATE TABLE t1 (a INT PRIMARY KEY, b MEDIUMTEXT) ENGINE=Innodb; INSERT INTO t1 VALUES(100, "MDEV-515"); connect con1,localhost,root,,; SET DEBUG_SYNC= "binlog_open_before_update_index SIGNAL con1_ready WAIT_FOR con1_cont"; SET SESSION debug_dbug="+d,crash_create_critical_before_update_index"; INSERT INTO t1 VALUES (1, REPEAT("x", 4100)); connection default; SET DEBUG_SYNC= "now WAIT_FOR con1_ready"; connect con2,localhost,root,,; SET DEBUG_SYNC= "ha_commit_trans_after_prepare SIGNAL con2_ready"; INSERT INTO t1 VALUES (2, NULL); connection default; SET DEBUG_SYNC= "now WAIT_FOR con2_ready"; SET DEBUG_SYNC= "now SIGNAL con1_cont"; connection con1; Got one of the listed errors connection default; SELECT a FROM t1 ORDER BY a; a 1 100 show binary logs; Log_name File_size master-bin.000001 # master-bin.000002 # include/show_binlog_events.inc Log_name Pos Event_type Server_id End_log_pos Info master-bin.000001 # Format_desc # # SERVER_VERSION, BINLOG_VERSION master-bin.000001 # Gtid_list # # [] master-bin.000001 # Binlog_checkpoint # # master-bin.000001 master-bin.000001 # Gtid # # GTID #-#-# master-bin.000001 # Query # # use `test`; CREATE TABLE t1 (a INT PRIMARY KEY, b MEDIUMTEXT) ENGINE=Innodb master-bin.000001 # Gtid # # BEGIN GTID #-#-# master-bin.000001 # Annotate_rows # # INSERT INTO t1 VALUES(100, "MDEV-515") master-bin.000001 # Table_map # # table_id: # (test.t1) master-bin.000001 # Write_rows_v1 # # table_id: # flags: STMT_END_F master-bin.000001 # Xid # # COMMIT /* XID */ master-bin.000001 # Gtid # # BEGIN GTID #-#-# master-bin.000001 # Annotate_rows # # INSERT INTO t1 VALUES (1, REPEAT("x", 4100)) master-bin.000001 # Table_map # # table_id: # (test.t1) master-bin.000001 # Write_rows_v1 # # table_id: # flags: STMT_END_F master-bin.000001 # Xid # # COMMIT /* XID */ master-bin.000001 # Rotate # # master-bin.000002;pos=POS connection default; DROP TABLE t1;