Ah. I had missed that. Reproduces with last 5.7 build today.
mysql> CREATE TABLE mysql.proc LIKE proc_backup; Query OK, 0 rows affected, 1 warning (0.04 sec)
mysql> select routine_name,routine_schema from information_schema.routines where routine_schema like 'bug0%'; ERROR 2013 (HY000): Lost connection to MySQL server during query
Ah. I had missed that. Reproduces with last 5.7 build today.
mysql> CREATE TABLE mysql.proc LIKE proc_backup;
Query OK, 0 rows affected, 1 warning (0.04 sec)
mysql> select routine_ name,routine_ schema from information_ schema. routines where routine_schema like 'bug0%';
ERROR 2013 (HY000): Lost connection to MySQL server during query