gcol.innodb_virtual_basic failed in buildbot with wrong result, sporadic

gcol.innodb_virtual_basic                w8 [ fail ]

        Test ended at 2026-07-17 19:53:14

CURRENT_TEST: gcol.innodb_virtual_basic

mysqltest: At line 519: The result of the 1st execution does not match with 

the result of the 2nd execution of ps-protocol:

 1st:

a	c

NULL	NULL

11	14

18	19

28	29

 2nd:

 a	c

11	14

18	19

28	29

NULL	NULL

The result from queries just before the failure was:

< snip >

`e` INT(11) GENERATED ALWAYS AS (10) VIRTUAL,

`h` INT(11) NOT NULL,

PRIMARY KEY (`h`),

KEY `m3` (`m3`),

KEY `c` (`c`(100)),

KEY `e` (`e`,`d`(20))

) ENGINE=InnoDB;

INSERT INTO t VALUES (1, 2, DEFAULT, 3, "aaa", DEFAULT, REPEAT('g', 10000), REPEAT('x', 2800), DEFAULT, DEFAULT, DEFAULT, 1);

INSERT INTO t VALUES (11, 21, DEFAULT, 31, "bbb", DEFAULT, REPEAT('a', 9000), REPEAT('b', 2000), DEFAULT, DEFAULT, DEFAULT, 2);

INSERT INTO t VALUES (21, 31, DEFAULT, 41, "zzz", DEFAULT, REPEAT('m', 8000), REPEAT('n', 3000), DEFAULT, DEFAULT, DEFAULT, 3);

ALTER TABLE t DROP COLUMN c;

DELETE FROM t;

DROP TABLE t;

CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10));

INSERT INTO t VALUES (11, 3, DEFAULT, 'mm');

INSERT INTO t VALUES (18, 1, DEFAULT, 'mm');

INSERT INTO t VALUES (28, 1, DEFAULT, 'mm');

INSERT INTO t VALUES (null, null, DEFAULT, 'mm');

CREATE INDEX idx ON t(a, c);

SELECT a, c FROM t;

More results from queries before failure can be found in /home/buildbot/x86-debian-12-fulltest-debug/build/mysql-test/var/8/log/innodb_virtual_basic.log

 - saving '/home/buildbot/x86-debian-12-fulltest-debug/build/mysql-test/var/8/log/gcol.innodb_virtual_basic/' to '/home/buildbot/x86-debian-12-fulltest-debug/build/mysql-test/var/log/gcol.innodb_virtual_basic/'

Retrying test gcol.innodb_virtual_basic, attempt(2/3)...