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MDEV-24512 Assertion failed in rec_is_metadata() in btr_discard_only_page_on_level()

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btr_discard_only_page_on_level(): Attempt to read the MDEV-15562 metadata
record from the leaf page, not the root page. In the root, the leftmost
(in this case, the only) node pointer would look like a metadata record.

This corruption bug was introduced in
commit 0e5a4ac253 (MDEV-15562).
The scenario is rare: a column was dropped instantly or the order of
columns was changed instantly, and then the table became empty in such
a way that in the last step, the root page had one child page.
Normally, a non-leaf B-tree page would always contain at least 2 children.
This commit is contained in:
Marko Mäkelä
2021-01-02 16:11:55 +02:00
parent 734c587f68
commit d67e17bb81
3 changed files with 36 additions and 8 deletions
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16
mysql-test/suite/innodb/r/instant_alter_debug.result
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@ -327,7 +327,6 @@ FROM information_schema.global_status
WHERE variable_name = 'innodb_instant_alter_column';
instants
22
SET GLOBAL innodb_purge_rseg_truncate_frequency = @save_frequency;
#
# MDEV-21045 AddressSanitizer: use-after-poison in mem_heap_dup / row_log_table_get_pk_col
#
@ -370,3 +369,18 @@ b
SET DEBUG_SYNC='RESET';
disconnect con2;
DROP TABLE t1;
#
# MDEV-24512 Assertion failed in rec_is_metadata()
# in btr_discard_only_page_on_level()
#
SET @save_limit= @@GLOBAL.innodb_limit_optimistic_insert_debug;
SET GLOBAL innodb_limit_optimistic_insert_debug=2;
CREATE TABLE t1 (c CHAR(1) UNIQUE) ENGINE=InnoDB;
ALTER TABLE t1 ADD c2 INT NOT NULL DEFAULT 0 FIRST;
INSERT INTO t1 (c) VALUES ('x'),('d'),('r'),('f'),('y'),('u'),('m'),('d');
ERROR 23000: Duplicate entry 'd' for key 'c'
SET GLOBAL innodb_limit_optimistic_insert_debug=@save_limit;
SELECT * FROM t1;
c2 c
DROP TABLE t1;
SET GLOBAL innodb_purge_rseg_truncate_frequency = @save_frequency;