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  1. MariaDB Server
  2. MDEV-16614

signal 7 after calling stored procedure, that uses regexp

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      DELIMITER $$;
      CREATE PROCEDURE p1(m1 varchar(5), m2 varchar(5))
      BEGIN
      SELECT a FROM
      	(SELECT "aa" a) t
      	JOIN (SELECT "aa" b) t1 on t.a=t1.b
      WHERE t.a regexp m1 and t1.b regexp m2
      GROUP BY a;
      END$$
      DELIMITER ;$$
       
      CALL p1('a','a');
      

      main.1_my                                [ fail ]  Found warnings/errors in server log file!
              Test ended at 2018-06-28 14:48:30
      line
      Error: Freeing overrun buffer  mysys/safemalloc.c:194, mysys/my_malloc.c:219, sql/item_cmpfunc.h:2092, sql/item_cmpfunc.h:2113, sql/item.h:1842, sql/sql_class.cc:3457, sql/sql_class.cc:2079, sql/sp_head.cc:1345
      Error: Freeing overrun buffer  mysys/safemalloc.c:194, mysys/my_malloc.c:219, sql/item_cmpfunc.h:2092, sql/item_cmpfunc.h:2113, sql/item.h:1842, sql/sql_class.cc:3457, sql/sql_class.cc:2079, sql/sp_head.cc:1345
      ^ Found warnings in /home/alice/git/10.2/mysql-test/var/log/mysqld.1.err
      

      180628 14:27:36 [ERROR] mysqld got signal 7 ;
      Server version: 10.3.7-MariaDB
      key_buffer_size=134217728
      read_buffer_size=131072
      max_used_connections=1
      max_threads=153
      thread_count=7
      It is possible that mysqld could use up to 
      key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467389 K  bytes of memory
      Hope that's ok; if not, decrease some variables in the equation.
       
      Thread pointer: 0x7f7c600009a8
      Attempting backtrace. You can use the following information to find out
      where mysqld died. If you see no messages after this, something went
      terribly wrong...
      stack_bottom = 0x7f7ccc247ec0 thread_stack 0x49000
      

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              bar Alexander Barkov
              alice Alice Sherepa
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