diff --git a/src/test/regress/expected/isolation_validate_vs_insert.out b/src/test/regress/expected/isolation_validate_vs_insert.out
new file mode 100644
index 000000000..212edbedf
--- /dev/null
+++ b/src/test/regress/expected/isolation_validate_vs_insert.out
@@ -0,0 +1,59 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1-initialize s1-add-constraint s1-begin s2-begin s1-validate s2-insert s1-commit s2-commit
+create_distributed_table
+
+               
+step s1-initialize: INSERT INTO constrained_table VALUES (0, 0), (1, 1), (2, 2), (3, 4);
+step s1-add-constraint: ALTER TABLE constrained_table ADD CONSTRAINT check_constraint CHECK(int_data<30) NOT VALID;
+step s1-begin: BEGIN;
+step s2-begin: BEGIN;
+step s1-validate: ALTER TABLE constrained_table VALIDATE CONSTRAINT check_constraint;
+step s2-insert: INSERT INTO constrained_table VALUES(10, 10);
+step s1-commit: COMMIT;
+step s2-commit: COMMIT;
+
+starting permutation: s1-initialize s1-add-constraint s1-begin s2-begin s1-validate s2-select s1-commit s2-commit
+create_distributed_table
+
+               
+step s1-initialize: INSERT INTO constrained_table VALUES (0, 0), (1, 1), (2, 2), (3, 4);
+step s1-add-constraint: ALTER TABLE constrained_table ADD CONSTRAINT check_constraint CHECK(int_data<30) NOT VALID;
+step s1-begin: BEGIN;
+step s2-begin: BEGIN;
+step s1-validate: ALTER TABLE constrained_table VALIDATE CONSTRAINT check_constraint;
+step s2-select: SELECT sum(int_data) FROM constrained_table;
+sum            
+
+7              
+step s1-commit: COMMIT;
+step s2-commit: COMMIT;
+
+starting permutation: s1-initialize s1-add-constraint s1-begin s2-begin s2-insert s1-validate s1-commit s2-commit
+create_distributed_table
+
+               
+step s1-initialize: INSERT INTO constrained_table VALUES (0, 0), (1, 1), (2, 2), (3, 4);
+step s1-add-constraint: ALTER TABLE constrained_table ADD CONSTRAINT check_constraint CHECK(int_data<30) NOT VALID;
+step s1-begin: BEGIN;
+step s2-begin: BEGIN;
+step s2-insert: INSERT INTO constrained_table VALUES(10, 10);
+step s1-validate: ALTER TABLE constrained_table VALIDATE CONSTRAINT check_constraint;
+step s1-commit: COMMIT;
+step s2-commit: COMMIT;
+
+starting permutation: s1-initialize s1-add-constraint s1-begin s2-begin s2-select s1-validate s1-commit s2-commit
+create_distributed_table
+
+               
+step s1-initialize: INSERT INTO constrained_table VALUES (0, 0), (1, 1), (2, 2), (3, 4);
+step s1-add-constraint: ALTER TABLE constrained_table ADD CONSTRAINT check_constraint CHECK(int_data<30) NOT VALID;
+step s1-begin: BEGIN;
+step s2-begin: BEGIN;
+step s2-select: SELECT sum(int_data) FROM constrained_table;
+sum            
+
+7              
+step s1-validate: ALTER TABLE constrained_table VALIDATE CONSTRAINT check_constraint;
+step s1-commit: COMMIT;
+step s2-commit: COMMIT;
diff --git a/src/test/regress/isolation_schedule b/src/test/regress/isolation_schedule
index d8d677beb..86cb914b2 100644
--- a/src/test/regress/isolation_schedule
+++ b/src/test/regress/isolation_schedule
@@ -43,6 +43,7 @@ test: isolation_truncate_vs_all
 test: isolation_drop_vs_all
 test: isolation_ddl_vs_all
 test: isolation_citus_dist_activity
+test: isolation_validate_vs_insert
 
 # MX tests
 test: isolation_reference_on_mx
diff --git a/src/test/regress/specs/isolation_validate_vs_insert.spec b/src/test/regress/specs/isolation_validate_vs_insert.spec
new file mode 100644
index 000000000..81d2d1c77
--- /dev/null
+++ b/src/test/regress/specs/isolation_validate_vs_insert.spec
@@ -0,0 +1,39 @@
+#
+# How we organize this isolation test spec, is explained at README.md file in this directory.
+#
+
+# create distributed table to test behavior of VALIDATE in concurrent operations
+setup
+{
+	SET citus.shard_replication_factor TO 1;
+	CREATE TABLE constrained_table(id integer, int_data int);
+	SELECT create_distributed_table('constrained_table', 'id');
+}
+
+# drop distributed table
+teardown
+{
+	DROP TABLE IF EXISTS constrained_table CASCADE;
+}
+
+# session 1
+session "s1"
+step "s1-initialize" { INSERT INTO constrained_table VALUES (0, 0), (1, 1), (2, 2), (3, 4); }
+step "s1-begin" { BEGIN; }
+step "s1-add-constraint" { ALTER TABLE constrained_table ADD CONSTRAINT check_constraint CHECK(int_data<30) NOT VALID; }
+step "s1-validate" { ALTER TABLE constrained_table VALIDATE CONSTRAINT check_constraint; }
+step "s1-commit" { COMMIT; }
+
+# session 2
+session "s2"
+step "s2-begin" { BEGIN; }
+step "s2-insert" { INSERT INTO constrained_table VALUES(10, 10); }
+step "s2-insert-invalid" { INSERT INTO constrained_table VALUES(100, 100); }
+step "s2-select" { SELECT sum(int_data) FROM constrained_table; }
+step "s2-commit" { COMMIT; }
+
+# permutations - check read and write are not blocked during validate queries
+permutation "s1-initialize" "s1-add-constraint" "s1-begin" "s2-begin" "s1-validate" "s2-insert" "s1-commit" "s2-commit"
+permutation "s1-initialize" "s1-add-constraint" "s1-begin" "s2-begin" "s1-validate" "s2-select" "s1-commit" "s2-commit"
+permutation "s1-initialize" "s1-add-constraint" "s1-begin" "s2-begin" "s2-insert" "s1-validate" "s1-commit" "s2-commit"
+permutation "s1-initialize" "s1-add-constraint" "s1-begin" "s2-begin" "s2-select" "s1-validate" "s1-commit" "s2-commit"