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# # Bug #59733 Possible deadlock when buffered changes are to be discarded # in buf_page_create # -- source include/have_innodb.inc -- disable_query_log # The flag innodb_change_buffering_debug is only available in debug builds. # It instructs InnoDB to try to evict pages from the buffer pool when # change buffering is possible, so that the change buffer will be used # whenever possible. -- error 0,ER_UNKNOWN_SYSTEM_VARIABLE SET @innodb_change_buffering_debug_orig = @@innodb_change_buffering_debug; -- error 0,ER_UNKNOWN_SYSTEM_VARIABLE SET GLOBAL innodb_change_buffering_debug = 1; -- enable_query_log CREATE TABLE bug59733(a INT AUTO_INCREMENT PRIMARY KEY,b CHAR(1)) ENGINE=InnoDB STATS_PERSISTENT=1 STATS_AUTO_RECALC=0; # Create enough rows for the table, so that the insert buffer will be # used. There must be multiple index pages, because changes to the # root page are never buffered. INSERT INTO bug59733 VALUES(0,'x'); INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; INSERT INTO bug59733 SELECT 0,b FROM bug59733; # Create the secondary index for which changes will be buffered. CREATE INDEX b ON bug59733 (b); # This should be buffered, if innodb_change_buffering_debug = 1 is in effect. DELETE FROM bug59733 WHERE (a%100)=0; # Drop the index in order to get free pages with orphaned buffered changes. DROP INDEX b ON bug59733; # Create the index and attempt to reuse pages for which buffered changes exist. CREATE INDEX b ON bug59733 (b); DROP TABLE bug59733; -- disable_query_log -- error 0, ER_UNKNOWN_SYSTEM_VARIABLE SET GLOBAL innodb_change_buffering_debug = @innodb_change_buffering_debug_orig;