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	Analysis: debug only assertion I_S function (IS is XtraDB feature) is calling buf_block_get_frame on any page it reads, which debug-asserts that the page is buffer-fixed, which is not the case in I_S query. Fixed by holding the buffer page mutex while the fields are read directly.
		
			
				
	
	
		
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| CREATE TABLE t1 ENGINE=InnoDB AS SELECT * FROM mysql.help_topic;
 | |
| DROP TABLE t1;
 |