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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;