Cascading foreign key causes crash with innodb plugin in 0.8 series

[Seppo Jaakola]

In 0.8.2 build, when starting the server with innodb plugin a crash happens in foreign key cascading phase.
Here's the steps to reproduce the crash with demo package:

   1. MYSQL_PORT=3307 mysql-galera -g gcomm:// --plugin
   2. mysql -uroot -prootpass -h0 -P3307 test
   3. mysql> create table t1 (i int primary key);
   4. mysql> create table t2 ( i int primary key, j int, foreign key (j) references test.t1 (i) on delete cascade);
   5. insert into t1 values (1);
   6. insert into t2 values (10,1);
   7. delete from t1;