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-rw-r--r--mysql-test/r/merge.result28
1 files changed, 28 insertions, 0 deletions
diff --git a/mysql-test/r/merge.result b/mysql-test/r/merge.result
index 5d96970ce74..0481ee8f49a 100644
--- a/mysql-test/r/merge.result
+++ b/mysql-test/r/merge.result
@@ -3575,4 +3575,32 @@ ERROR HY000: The definition of table 'v1' prevents operation DELETE on table 'm1
drop view v1;
drop temporary table tmp;
drop table t1, t2, t3, m1, m2;
+#
+# Test for bug #56251 "Deadlock with INSERT DELAYED and MERGE tables".
+#
+drop table if exists t1, t2, tm;
+create table t1(a int);
+create table t2(a int);
+create table tm(a int) engine=merge union=(t1, t2);
+begin;
+select * from t1;
+a
+# Connection 'con1'.
+# Sending:
+alter table t1 comment 'test';
+# Connection 'default'.
+# Wait until ALTER TABLE blocks and starts waiting
+# for connection 'default'. It should wait with a
+# pending SNW lock on 't1'.
+# Attempt to perform delayed insert into 'tm' should not lead
+# to a deadlock. Instead error ER_DELAYED_NOT_SUPPORTED should
+# be emitted.
+insert delayed into tm values (1);
+ERROR HY000: DELAYED option not supported for table 'tm'
+# Unblock ALTER TABLE.
+commit;
+# Connection 'con1'.
+# Reaping ALTER TABLE:
+# Connection 'default'.
+drop tables tm, t1, t2;
End of 6.0 tests