diff --git i/src/test/isolation/expected/insert-conflict-specconflict.out w/src/test/isolation/expected/insert-conflict-specconflict.out
index 47f5c665396..762a5869383 100644
--- i/src/test/isolation/expected/insert-conflict-specconflict.out
+++ w/src/test/isolation/expected/insert-conflict-specconflict.out
@@ -13,10 +13,10 @@ pg_advisory_locksess           lock
 step controller_show: SELECT * FROM upserttest;
 key            data           
 
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 3
 step s1_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s1') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s1'; <waiting ...>
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 3
 step s2_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s2') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s2'; <waiting ...>
 step controller_show: SELECT * FROM upserttest;
@@ -34,13 +34,13 @@ step controller_unlock_1_3: SELECT pg_advisory_unlock(1, 3);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step controller_unlock_2_3: SELECT pg_advisory_unlock(2, 3);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step controller_show: SELECT * FROM upserttest;
 key            data           
@@ -58,9 +58,9 @@ step controller_unlock_1_2: SELECT pg_advisory_unlock(1, 2);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step s1_upsert: <... completed>
 step controller_show: SELECT * FROM upserttest;
@@ -81,10 +81,10 @@ pg_advisory_locksess           lock
 step controller_show: SELECT * FROM upserttest;
 key            data           
 
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 3
 step s1_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s1') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s1'; <waiting ...>
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 3
 step s2_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s2') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s2'; <waiting ...>
 step controller_show: SELECT * FROM upserttest;
@@ -102,13 +102,13 @@ step controller_unlock_1_3: SELECT pg_advisory_unlock(1, 3);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step controller_unlock_2_3: SELECT pg_advisory_unlock(2, 3);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step controller_show: SELECT * FROM upserttest;
 key            data           
@@ -126,9 +126,9 @@ step controller_unlock_2_2: SELECT pg_advisory_unlock(2, 2);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step s2_upsert: <... completed>
 step controller_show: SELECT * FROM upserttest;
@@ -149,10 +149,10 @@ pg_advisory_locksess           lock
 step controller_show: SELECT * FROM upserttest;
 key            data           
 
-s1: NOTICE:  blurt_and_lock_123() called for k2
+s1: NOTICE:  blurt_and_lock_123() called for k2 in session 1
 s1: NOTICE:  acquiring advisory lock on 3
 step s1_insert_toast: INSERT INTO upserttest VALUES('k2', ctoast_large_val()) ON CONFLICT DO NOTHING; <waiting ...>
-s2: NOTICE:  blurt_and_lock_123() called for k2
+s2: NOTICE:  blurt_and_lock_123() called for k2 in session 2
 s2: NOTICE:  acquiring advisory lock on 3
 step s2_insert_toast: INSERT INTO upserttest VALUES('k2', ctoast_large_val()) ON CONFLICT DO NOTHING; <waiting ...>
 step controller_show: SELECT * FROM upserttest;
@@ -170,13 +170,13 @@ step controller_unlock_1_3: SELECT pg_advisory_unlock(1, 3);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k2
+s1: NOTICE:  blurt_and_lock_123() called for k2 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step controller_unlock_2_3: SELECT pg_advisory_unlock(2, 3);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k2
+s2: NOTICE:  blurt_and_lock_123() called for k2 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step controller_show: SELECT * FROM upserttest;
 key            data           
@@ -194,9 +194,9 @@ step controller_unlock_2_2: SELECT pg_advisory_unlock(2, 2);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k2
+s2: NOTICE:  blurt_and_lock_123() called for k2 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
-s2: NOTICE:  blurt_and_lock_123() called for k2
+s2: NOTICE:  blurt_and_lock_123() called for k2 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step s2_insert_toast: <... completed>
 step controller_show_count: SELECT COUNT(*) FROM upserttest;
@@ -219,10 +219,10 @@ key            data
 
 step s1_begin: BEGIN;
 step s2_begin: BEGIN;
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 3
 step s1_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s1') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s1'; <waiting ...>
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 3
 step s2_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s2') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s2'; <waiting ...>
 step controller_show: SELECT * FROM upserttest;
@@ -240,13 +240,13 @@ step controller_unlock_1_3: SELECT pg_advisory_unlock(1, 3);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step controller_unlock_2_3: SELECT pg_advisory_unlock(2, 3);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step controller_show: SELECT * FROM upserttest;
 key            data           
@@ -263,15 +263,15 @@ step controller_unlock_2_2: SELECT pg_advisory_unlock(2, 2);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step controller_show: SELECT * FROM upserttest;
 key            data           
 
 step s1_commit: COMMIT;
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step s2_upsert: <... completed>
 step controller_show: SELECT * FROM upserttest;
@@ -284,7 +284,7 @@ key            data
 
 k1             inserted s1 with conflict update s2
 
-starting permutation: s1_create_non_unique_index s1_confirm_index_order controller_locks controller_show s1_upsert s2_upsert controller_show controller_unlock_1_1 controller_unlock_2_1 controller_unlock_1_3 controller_unlock_2_3 controller_show controller_lock_2_4 controller_unlock_2_2 controller_show controller_unlock_1_2 controller_print_speculative_locks controller_unlock_2_4 controller_show
+starting permutation: s1_create_non_unique_index s1_confirm_index_order controller_locks controller_show s2_begin s1_upsert s2_upsert controller_show controller_unlock_1_1 controller_unlock_2_1 controller_unlock_1_3 controller_unlock_2_3 controller_show controller_lock_2_4 controller_unlock_2_2 controller_show controller_unlock_1_2 controller_print_speculative_locks controller_unlock_2_4 s2_commit controller_show
 step s1_create_non_unique_index: CREATE INDEX upserttest_key_idx ON upserttest((blurt_and_lock_4(key)));
 step s1_confirm_index_order: SELECT 'upserttest_key_uniq_idx'::regclass::int8 < 'upserttest_key_idx'::regclass::int8;
 ?column?       
@@ -302,10 +302,11 @@ pg_advisory_locksess           lock
 step controller_show: SELECT * FROM upserttest;
 key            data           
 
-s1: NOTICE:  blurt_and_lock_123() called for k1
+step s2_begin: BEGIN;
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 3
 step s1_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s1') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s1'; <waiting ...>
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 3
 step s2_upsert: INSERT INTO upserttest(key, data) VALUES('k1', 'inserted s2') ON CONFLICT (blurt_and_lock_123(key)) DO UPDATE SET data = upserttest.data || ' with conflict update s2'; <waiting ...>
 step controller_show: SELECT * FROM upserttest;
@@ -323,13 +324,13 @@ step controller_unlock_1_3: SELECT pg_advisory_unlock(1, 3);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step controller_unlock_2_3: SELECT pg_advisory_unlock(2, 3);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_123() called for k1
+s2: NOTICE:  blurt_and_lock_123() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 2
 step controller_show: SELECT * FROM upserttest;
 key            data           
@@ -342,7 +343,7 @@ step controller_unlock_2_2: SELECT pg_advisory_unlock(2, 2);
 pg_advisory_unlock
 
 t              
-s2: NOTICE:  blurt_and_lock_4() called for k1
+s2: NOTICE:  blurt_and_lock_4() called for k1 in session 2
 s2: NOTICE:  acquiring advisory lock on 4
 step controller_show: SELECT * FROM upserttest;
 key            data           
@@ -351,11 +352,11 @@ step controller_unlock_1_2: SELECT pg_advisory_unlock(1, 2);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_4() called for k1
+s1: NOTICE:  blurt_and_lock_4() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 4
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step controller_print_speculative_locks: SELECT locktype, mode, granted FROM pg_locks WHERE locktype='speculative token' ORDER BY granted;
 locktype       mode           granted        
@@ -366,10 +367,13 @@ step controller_unlock_2_4: SELECT pg_advisory_unlock(2, 4);
 pg_advisory_unlock
 
 t              
-s1: NOTICE:  blurt_and_lock_123() called for k1
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
+s1: NOTICE:  acquiring advisory lock on 2
+step s2_upsert: <... completed>
+step s2_commit: COMMIT;
+s1: NOTICE:  blurt_and_lock_123() called for k1 in session 1
 s1: NOTICE:  acquiring advisory lock on 2
 step s1_upsert: <... completed>
-step s2_upsert: <... completed>
 step controller_show: SELECT * FROM upserttest;
 key            data           
 
diff --git i/src/test/isolation/specs/insert-conflict-specconflict.spec w/src/test/isolation/specs/insert-conflict-specconflict.spec
index 2696c332a89..c029b94a9c2 100644
--- i/src/test/isolation/specs/insert-conflict-specconflict.spec
+++ w/src/test/isolation/specs/insert-conflict-specconflict.spec
@@ -10,7 +10,7 @@ setup
 {
      CREATE OR REPLACE FUNCTION blurt_and_lock_123(text) RETURNS text IMMUTABLE LANGUAGE plpgsql AS $$
      BEGIN
-        RAISE NOTICE 'blurt_and_lock_123() called for %', $1;
+        RAISE NOTICE 'blurt_and_lock_123() called for % in session %', $1, current_setting('spec.session')::int;
 
 	-- depending on lock state, wait for lock 2 or 3
         IF pg_try_advisory_xact_lock(current_setting('spec.session')::int, 1) THEN
@@ -25,8 +25,8 @@ setup
 
     CREATE OR REPLACE FUNCTION blurt_and_lock_4(text) RETURNS text IMMUTABLE LANGUAGE plpgsql AS $$
     BEGIN
-        RAISE NOTICE 'blurt_and_lock_4() called for %', $1;
-		RAISE NOTICE 'acquiring advisory lock on 4';
+        RAISE NOTICE 'blurt_and_lock_4() called for % in session %', $1, current_setting('spec.session')::int;
+        RAISE NOTICE 'acquiring advisory lock on 4';
         PERFORM pg_advisory_xact_lock(current_setting('spec.session')::int, 4);
     RETURN $1;
     END;$$;
@@ -210,6 +210,7 @@ permutation
    "s1_confirm_index_order"
    "controller_locks"
    "controller_show"
+   "s2_begin"
    # Both sessions wait on advisory locks
    "s1_upsert" "s2_upsert"
    "controller_show"
@@ -235,5 +236,6 @@ permutation
    # Allow s2 to insert into the non-unique index and complete
    # s1 will no longer wait and will proceed to update
    "controller_unlock_2_4"
+   "s2_commit"
    # This should now show a successful UPSERT
    "controller_show"