Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Duplicate
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5.5.25
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None
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None
Description
I get the following assertion when using ./mtr --ps-protocol in 5.5:
#7 0x00000000006c49e0 in Prepared_statement::prepare (this=0x47bb410,
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packet=0x7f11c41293d1 "", packet_len=44)
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at /home/buildbot/build/sql/sql_prepare.cc:3373
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#8 0x00000000006bfb02 in mysqld_stmt_prepare (thd=0x7f11c4123d40,
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packet=0x7f11c41293d1 "", packet_length=44)
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at /home/buildbot/build/sql/sql_prepare.cc:2279
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#9 0x000000000068a0b8 in dispatch_command (command=COM_STMT_PREPARE,
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thd=0x7f11c4123d40, packet=0x7f11c41293d1 "", packet_length=44)
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at /home/buildbot/build/sql/sql_parse.cc:1024
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#10 0x0000000000688f61 in do_command (thd=0x7f11c4123d40)
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at /home/buildbot/build/sql/sql_parse.cc:794
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Here is a full test case, remember it only causes assertion/crash if run with
--ps-protocol in a debug build:
--source include/have_binlog_format_statement.inc
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CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=heap;
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INSERT INTO t1 VALUES (1), (2), (5);
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# Restart the master mysqld.
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--write_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
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wait-rpl_mdev382.test
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EOF
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--shutdown_server 30
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--append_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
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restart-rpl_mdev382.test
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EOF
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--enable_reconnect
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--source include/wait_until_connected_again.inc
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SELECT * FROM t1;
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DROP TABLE t1;
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The situation is the following. We have a MEMORY table. We restart the server,
so this implicitly causes the table to loose its content.
We then access the table with a prepared statement. As a side effect an
explicit DROP TABLE is put in the binlog.
In this situation, we hit this assertion in sql_prepare.cc:
/* No need to commit statement transaction, it's not started. */
DBUG_ASSERT(thd->transaction.stmt.is_empty());
Attachments
Issue Links
- is duplicated by
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- Closed
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