diff --git a/src/test/regress/expected/isolation_concurrent_dml.out b/src/test/regress/expected/isolation_concurrent_dml.out
index f7f8fc9ee..8fab5e91b 100644
--- a/src/test/regress/expected/isolation_concurrent_dml.out
+++ b/src/test/regress/expected/isolation_concurrent_dml.out
@@ -28,3 +28,62 @@ step s1-insert:
 step s2-update: 
     UPDATE test_concurrent_dml SET data = 'blarg' WHERE test_id = 1;
 
+
+starting permutation: s1-begin s1-multi-insert s2-update s1-commit
+master_create_worker_shards
+
+               
+step s1-begin: 
+    BEGIN;
+
+step s1-multi-insert: 
+    INSERT INTO test_concurrent_dml VALUES (1), (2);
+
+step s2-update: 
+    UPDATE test_concurrent_dml SET data = 'blarg' WHERE test_id = 1;
+ <waiting ...>
+step s1-commit: 
+    COMMIT;
+
+step s2-update: <... completed>
+
+starting permutation: s1-begin s1-multi-insert s2-multi-insert-overlap s1-commit
+master_create_worker_shards
+
+               
+step s1-begin: 
+    BEGIN;
+
+step s1-multi-insert: 
+    INSERT INTO test_concurrent_dml VALUES (1), (2);
+
+step s2-multi-insert-overlap: 
+    INSERT INTO test_concurrent_dml VALUES (1), (4);
+ <waiting ...>
+step s1-commit: 
+    COMMIT;
+
+step s2-multi-insert-overlap: <... completed>
+
+starting permutation: s1-begin s2-begin s1-multi-insert s2-multi-insert s1-commit s2-commit
+master_create_worker_shards
+
+               
+step s1-begin: 
+    BEGIN;
+
+step s2-begin: 
+    BEGIN;
+
+step s1-multi-insert: 
+    INSERT INTO test_concurrent_dml VALUES (1), (2);
+
+step s2-multi-insert: 
+    INSERT INTO test_concurrent_dml VALUES (3), (4);
+
+step s1-commit: 
+    COMMIT;
+
+step s2-commit: 
+    COMMIT;
+
diff --git a/src/test/regress/expected/isolation_distributed_transaction_id.out b/src/test/regress/expected/isolation_distributed_transaction_id.out
index 41806ad2e..56dd8ed15 100644
--- a/src/test/regress/expected/isolation_distributed_transaction_id.out
+++ b/src/test/regress/expected/isolation_distributed_transaction_id.out
@@ -98,7 +98,7 @@ step s1-get-current-transaction-id:
 
 row            
 
-(0,290)        
+(0,301)        
 step s2-get-first-worker-active-transactions: 
 		SELECT * FROM run_command_on_workers('SELECT row(initiator_node_identifier, transaction_number)
 												FROM	 
@@ -109,4 +109,4 @@ step s2-get-first-worker-active-transactions:
 
 nodename       nodeport       success        result         
 
-localhost      57637          t              (0,290)        
+localhost      57637          t              (0,301)        
diff --git a/src/test/regress/expected/isolation_dump_global_wait_edges.out b/src/test/regress/expected/isolation_dump_global_wait_edges.out
index 6365b7719..e0621fa88 100644
--- a/src/test/regress/expected/isolation_dump_global_wait_edges.out
+++ b/src/test/regress/expected/isolation_dump_global_wait_edges.out
@@ -29,11 +29,11 @@ step detector-dump-wait-edges:
 
 waiting_transaction_numblocking_transaction_numblocking_transaction_waiting
 
-293            292            f              
+304            303            f              
 transactionnumberwaitingtransactionnumbers
 
-292                           
-293            292            
+303                           
+304            303            
 step s1-abort: 
     ABORT;
 
@@ -77,14 +77,14 @@ step detector-dump-wait-edges:
 
 waiting_transaction_numblocking_transaction_numblocking_transaction_waiting
 
-297            296            f              
-298            296            f              
-298            297            t              
+308            307            f              
+309            307            f              
+309            308            t              
 transactionnumberwaitingtransactionnumbers
 
-296                           
-297            296            
-298            296,297        
+307                           
+308            307            
+309            307,308        
 step s1-abort: 
     ABORT;
 
diff --git a/src/test/regress/expected/isolation_replace_wait_function.out b/src/test/regress/expected/isolation_replace_wait_function.out
index 2b0cbd87c..4a6673c3c 100644
--- a/src/test/regress/expected/isolation_replace_wait_function.out
+++ b/src/test/regress/expected/isolation_replace_wait_function.out
@@ -16,7 +16,7 @@ step s1-finish:
   COMMIT;
 
 step s2-insert: <... completed>
-error in steps s1-finish s2-insert: ERROR:  duplicate key value violates unique constraint "test_locking_a_key_102781"
+error in steps s1-finish s2-insert: ERROR:  duplicate key value violates unique constraint "test_locking_a_key_102793"
 step s2-finish: 
   COMMIT;
 
diff --git a/src/test/regress/specs/isolation_concurrent_dml.spec b/src/test/regress/specs/isolation_concurrent_dml.spec
index 74c86583f..642dd2a22 100644
--- a/src/test/regress/specs/isolation_concurrent_dml.spec
+++ b/src/test/regress/specs/isolation_concurrent_dml.spec
@@ -22,6 +22,11 @@ step "s1-insert"
     INSERT INTO test_concurrent_dml VALUES(1);
 }
 
+step "s1-multi-insert"
+{
+    INSERT INTO test_concurrent_dml VALUES (1), (2);
+}
+
 step "s1-commit"
 {
     COMMIT;
@@ -29,12 +34,42 @@ step "s1-commit"
 
 session "s2"
 
+step "s2-begin"
+{
+    BEGIN;
+}
+
 step "s2-update"
 {
     UPDATE test_concurrent_dml SET data = 'blarg' WHERE test_id = 1;
 }
 
+step "s2-multi-insert-overlap"
+{
+    INSERT INTO test_concurrent_dml VALUES (1), (4);
+}
+
+step "s2-multi-insert"
+{
+    INSERT INTO test_concurrent_dml VALUES (3), (4);
+}
+
+step "s2-commit"
+{
+    COMMIT;
+}
+
 # verify that an in-progress insert blocks concurrent updates
 permutation "s1-begin" "s1-insert" "s2-update" "s1-commit"
+
 # but an insert without xact will not block
 permutation "s1-insert" "s2-update"
+
+# verify that an in-progress multi-row insert blocks concurrent updates
+permutation "s1-begin" "s1-multi-insert" "s2-update" "s1-commit"
+
+# two multi-row inserts that hit same shards will block
+permutation "s1-begin" "s1-multi-insert" "s2-multi-insert-overlap" "s1-commit"
+
+# but concurrent multi-row inserts don't block unless shards overlap
+permutation "s1-begin" "s2-begin" "s1-multi-insert" "s2-multi-insert" "s1-commit" "s2-commit"