MDEV-36814 MariaDB 10.11.9 Signal 11 crash on second Stored Procedure call

don't reset thd->lex->current_select, it's not a leftover
from previous parsing, it's set in reinit_stmt_before_use()

Author: vuvova

mysql-test/main/sp-bugs2.result

@@ -42,4 +42,21 @@ t1test(1)
 wrbyviwb
 drop function t1test;
 drop table t1;
+#
+# MDEV-36814 MariaDB 10.11.9 Signal 11 crash on second Stored Procedure call
+#
+set names utf8;
+create table t1 (a varchar(1000));
+create procedure p1(in p_a varchar(1000)) insert into t1 values (p_a);//
+create procedure p2(in s varchar(10))
+begin
+if s = '1' then set @startDate = now(); end if;
+if s = '2' then set @startDate = '2025-05-23'; end if;
+call p1(concat(s, @startDate, ' and '));
+end;//
+call p2('1');
+call p2('2');
+drop table t1;
+drop procedure p1;
+drop procedure p2;
 # End of 10.11 tests

mysql-test/main/sp-bugs2.test

@@ -47,4 +47,24 @@ select t1test(1);
 drop function t1test;
 drop table t1;
 
+--echo #
+--echo # MDEV-36814 MariaDB 10.11.9 Signal 11 crash on second Stored Procedure call
+--echo #
+set names utf8;
+create table t1 (a varchar(1000));
+--delimiter //
+create procedure p1(in p_a varchar(1000)) insert into t1 values (p_a);//
+create procedure p2(in s varchar(10))
+begin
+    if s = '1' then set @startDate = now(); end if;
+    if s = '2' then set @startDate = '2025-05-23'; end if;
+    call p1(concat(s, @startDate, ' and '));
+end;//
+--delimiter ;
+call p2('1');
+call p2('2');
+drop table t1;
+drop procedure p1;
+drop procedure p2;
+
 --echo # End of 10.11 tests

sql/sql_parse.cc

@@ -3072,11 +3072,6 @@ static bool do_execute_sp(THD *thd, sp_head *sp)
   ha_rows select_limit= thd->variables.select_limit;
   thd->variables.select_limit= HA_POS_ERROR;
 
-  /*
-    Reset current_select as it may point to random data as a
-    result of previous parsing.
-  */
-  thd->lex->current_select= NULL;
   thd->lex->in_sum_func= 0;                     // For Item_field::fix_fields()
 
   /*