cannot repeat either with mtr or with rqg in both debug and optimizer builds

If you are not able to reproduce it in the shared environment as described above, please let me know, I will see what else I can do.

As an MTR test case, please try this one (I tried both linux 32 bit and 64 bit, failed on every attempt. Revno 3272)

--source include/have_innodb.inc

SET GLOBAL innodb_lock_wait_timeout=3;

CREATE TABLE t1 (
col_int_key INT,
KEY (col_int_key)
) ENGINE=InnoDB
PARTITION BY KEY(col_int_key) PARTITIONS 2;
INSERT INTO t1 VALUES (6);

--connect (con1,127.0.0.1,root,,test)
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SET AUTOCOMMIT=OFF;
SELECT col_int_key FROM t1;

--connection default
--send
DELETE IGNORE FROM t1;

--connection con1
DELETE FROM t1 WHERE col_int_key IN (1, 40000000);

--connection default
--reap

1. End of test case