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The problem was that the COM_STMT_SEND_LONG_DATA was sending a response packet if the prepared statement wasn't found in the server (due to reconnection). The commands COM_STMT_SEND_LONG_DATA and COM_STMT_CLOSE should not send any packets, even error packets should not be sent since they are not expected by the client API. The solution is to clear generated during the execution of the aforementioned commands and to skip resend of prepared statement commands. Another fix is that if the connection breaks during the send of prepared statement command, the command is not sent again since the prepared statement is no longer in the server. libmysql/libmysql.c: The mysql handle might be reset after a reconnection. Pass the now used stmt argument to cli_advanced_command. sql-common/client.c: Don't resend command if the connection broke and it's a prepared statement command. If the session is broken, prepared statements on the server are gone, set the error accordanly. sql/sql_prepare.cc: Clear any error set during the execution of the request command. tests/mysql_client_test.c: Fix memory leak by freeing result associated with statement. Remove test case for Bug 29948 because it's not reliable in 5.0 (fixed in 5.1) due to KILL queries sending two packets for a thread that kills itself.
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