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# # Bug #21983865 UNEXPECTED DEADLOCK WITH INNODB_AUTOINC_LOCK_MODE=0 # create table t1(f1 int not null auto_increment primary key) engine=innodb; # Hold autoinc_lock on table t1 from connection con1 set debug_sync='ib_after_row_insert SIGNAL others WAIT_FOR continue_others'; insert into t1 values(NULL); # Create 40 connections and make it to wait for autoinc_lock on table t1. # Release the auto_inc lock on table t1 for connection con1 set debug_sync='now SIGNAL continue_others'; # Now all 40 connections can finish the insert operation on t1. drop table t1;