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MySQL handles the join syntax "JOIN ... USING( field1, ... )" and natural joins by building the same parse tree as a corresponding join with an "ON t1.field1 = t2.field1 ..." expression would produce. This parse tree was not cleaned up properly in the following scenario. If a thread tries to lock some tables and finds that the tables were dropped and re-created while waiting for the lock, it cleans up column references in the statement by means a per-statement free list. But if the statement was part of a stored procedure, column references on the stored procedure's free list weren't cleaned up and thus contained pointers to freed objects. Fixed by adding a call to clean up the current prepared statement's free list. mysql-test/r/sp_sync.result: Bug#48157: Test case mysql-test/t/sp_sync.test: Bug#48157: Test result sql/item.h: Bug#48157: Commented field. sql/sql_parse.cc: Bug#48157: Commented function. sql/sql_update.cc: Bug#48157: fix
23 lines
747 B
Text
23 lines
747 B
Text
Tests of syncronization of stored procedure execution.
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#
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# Bug#48157: crash in Item_field::used_tables
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#
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CREATE TABLE t1 AS SELECT 1 AS a, 1 AS b;
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CREATE TABLE t2 AS SELECT 1 AS a, 1 AS b;
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CREATE PROCEDURE p1()
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BEGIN
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UPDATE t1 JOIN t2 USING( a, b ) SET t1.b = 1, t2.b = 1;
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END|
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LOCK TABLES t1 WRITE, t2 WRITE;
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SET DEBUG_SYNC = 'multi_update_reopen_tables SIGNAL parked WAIT_FOR go';
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CALL p1();
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DROP TABLE t1, t2;
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SET DEBUG_SYNC = 'now WAIT_FOR parked';
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CREATE TABLE t1 AS SELECT 1 AS a, 1 AS b;
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CREATE TABLE t2 AS SELECT 1 AS a, 1 AS b;
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SET DEBUG_SYNC = 'now SIGNAL go';
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# Without the DEBUG_SYNC supplied in the same patch as this test in the
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# code, this test statement will hang.
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DROP TABLE t1, t2;
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DROP PROCEDURE p1;
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SET DEBUG_SYNC = 'RESET';
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