diff --git a/src/test/isolation/expected/drop-index-concurrently-1.out b/src/test/isolation/expected/drop-index-concurrently-1.out
deleted file mode 100644
index c42ac91f8be1dfca52ac4a51bc9ed3350fb6a19d..0000000000000000000000000000000000000000
--- a/src/test/isolation/expected/drop-index-concurrently-1.out
+++ /dev/null
@@ -1,36 +0,0 @@
-Parsed test spec with 3 sessions
-
-starting permutation: noseq prepi preps begin explaini explains select2 drop insert2 end2 selecti selects end
-step noseq: SET enable_seqscan = false;
-step prepi: PREPARE getrow_idx AS SELECT * FROM test_dc WHERE data=34;
-step preps: PREPARE getrow_seq AS SELECT * FROM test_dc WHERE data::text=34::text;
-step begin: BEGIN;
-step explaini: EXPLAIN (COSTS OFF) EXECUTE getrow_idx;
-QUERY PLAN     
-
-Index Scan using test_dc_data on test_dc
-  Index Cond: (data = 34)
-step explains: EXPLAIN (COSTS OFF) EXECUTE getrow_seq;
-QUERY PLAN     
-
-Seq Scan on test_dc
-  Filter: ((data)::text = '34'::text)
-step select2: SELECT * FROM test_dc WHERE data=34;
-id             data           
-
-34             34             
-step drop: DROP INDEX CONCURRENTLY test_dc_data; <waiting ...>
-step insert2: INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100);
-step end2: COMMIT;
-step selecti: EXECUTE getrow_idx;
-id             data           
-
-34             34             
-134            34             
-step selects: EXECUTE getrow_seq;
-id             data           
-
-34             34             
-134            34             
-step end: COMMIT;
-step drop: <... completed>
diff --git a/src/test/isolation/expected/drop-index-concurrently-2.out b/src/test/isolation/expected/drop-index-concurrently-2.out
deleted file mode 100644
index 48027776237ca3becdfb30f695ff9c2421a51fca..0000000000000000000000000000000000000000
--- a/src/test/isolation/expected/drop-index-concurrently-2.out
+++ /dev/null
@@ -1,24 +0,0 @@
-Parsed test spec with 3 sessions
-
-starting permutation: explain drop cancel rollback droptab selecti dropi
-step explain: EXPLAIN (COSTS OFF) SELECT * FROM test_dc WHERE data=34343;
-QUERY PLAN     
-
-Bitmap Heap Scan on test_dc
-  Recheck Cond: (data = 34343)
-  ->  Bitmap Index Scan on test_dc_data
-        Index Cond: (data = 34343)
-step drop: DROP INDEX CONCURRENTLY test_dc_data; <waiting ...>
-step cancel: SELECT pg_cancel_backend(pid) FROM pg_stat_activity WHERE query = 'DROP INDEX CONCURRENTLY test_dc_data;';
-pg_cancel_backend
-
-t              
-step drop: <... completed>
-error in steps cancel drop: ERROR:  canceling statement due to user request
-step rollback: ROLLBACK;
-step droptab: DROP TABLE test_dc;
-step selecti: SELECT indexrelid::regclass, indisvalid, indisready FROM pg_index WHERE indexrelid = 'test_dc_data'::regclass;
-indexrelid     indisvalid     indisready     
-
-test_dc_data   f              f              
-step dropi: DROP INDEX test_dc_data;
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index d964aafa17a847ff53b06abe55b5837ba36c31f5..75e33bc99fc30a1116d5676bbb0fe72c0da3f495 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -14,5 +14,3 @@ test: fk-contention
 test: fk-deadlock
 test: fk-deadlock2
 test: eval-plan-qual
-test: drop-index-concurrently-1
-test: drop-index-concurrently-2
diff --git a/src/test/isolation/specs/drop-index-concurrently-1.spec b/src/test/isolation/specs/drop-index-concurrently-1.spec
deleted file mode 100644
index 83c44ab31ac4d337d11a5547f77f5ee78f3618e8..0000000000000000000000000000000000000000
--- a/src/test/isolation/specs/drop-index-concurrently-1.spec
+++ /dev/null
@@ -1,33 +0,0 @@
-setup
-{
-	CREATE TABLE test_dc(id serial primary key, data int);
-	INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100);
-	CREATE INDEX test_dc_data ON test_dc(data);
-}
-
-teardown
-{
-	DROP TABLE test_dc;
-}
-
-session "s1"
-step "noseq" { SET enable_seqscan = false; }
-step "prepi" { PREPARE getrow_idx AS SELECT * FROM test_dc WHERE data=34; }
-step "preps" { PREPARE getrow_seq AS SELECT * FROM test_dc WHERE data::text=34::text; }
-step "begin" { BEGIN; }
-step "explaini" { EXPLAIN (COSTS OFF) EXECUTE getrow_idx; }
-step "explains" { EXPLAIN (COSTS OFF) EXECUTE getrow_seq; }
-step "selecti" { EXECUTE getrow_idx; }
-step "selects" { EXECUTE getrow_seq; }
-step "end" { COMMIT; }
-
-session "s2"
-setup { BEGIN; }
-step "select2" { SELECT * FROM test_dc WHERE data=34; }
-step "insert2" { INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100); }
-step "end2" { COMMIT; }
-
-session "s3"
-step "drop" { DROP INDEX CONCURRENTLY test_dc_data; }
-
-permutation "noseq" "prepi" "preps" "begin" "explaini" "explains" "select2" "drop" "insert2" "end2" "selecti" "selects" "end"
diff --git a/src/test/isolation/specs/drop-index-concurrently-2.spec b/src/test/isolation/specs/drop-index-concurrently-2.spec
deleted file mode 100644
index 273f7353e54d1c6c9a99a8d9f09cdeff586f7d99..0000000000000000000000000000000000000000
--- a/src/test/isolation/specs/drop-index-concurrently-2.spec
+++ /dev/null
@@ -1,21 +0,0 @@
-setup
-{
-	CREATE TABLE test_dc(id serial primary key, data int);
-	CREATE INDEX test_dc_data ON test_dc(data);
-}
-
-session "s1"
-setup { BEGIN; }
-step "explain" { EXPLAIN (COSTS OFF) SELECT * FROM test_dc WHERE data=34343; }
-step "rollback" { ROLLBACK; }
-step "droptab" { DROP TABLE test_dc; }
-step "selecti" { SELECT indexrelid::regclass, indisvalid, indisready FROM pg_index WHERE indexrelid = 'test_dc_data'::regclass; }
-step "dropi" { DROP INDEX test_dc_data; }
-
-session "s2"
-step "drop" { DROP INDEX CONCURRENTLY test_dc_data; }
-
-session "s3"
-step "cancel" { SELECT pg_cancel_backend(pid) FROM pg_stat_activity WHERE query = 'DROP INDEX CONCURRENTLY test_dc_data;'; }
-
-permutation "explain" "drop" "cancel" "rollback" "droptab" "selecti" "dropi"