@@ -181,6 +181,7 @@ __set_param_fresh_context(int i915, struct drm_i915_gem_context_param param)
 static void invalid_balancer(int i915)
 {
 	I915_DEFINE_CONTEXT_ENGINES_LOAD_BALANCE(balancer, 64);
+	I915_DEFINE_CONTEXT_ENGINES_BOND(bond, 1);
 	I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, 64);
 	struct drm_i915_gem_context_param p = {
 		.param = I915_CONTEXT_PARAM_ENGINES,

@@ -295,6 +296,32 @@ static void invalid_balancer(int i915)
 		igt_assert_eq(__set_param_fresh_context(i915, p), -EFAULT);
 
 		munmap(ptr + 4096, 4096);
+
+		if (count >= 2) {
+			/* You can't bond to a balanced engine */
+			memset(&bond, 0, sizeof(bond));
+			bond.base.name = I915_CONTEXT_ENGINES_EXT_BOND;
+			bond.master = ci[0];
+			bond.virtual_index = 0;
+			bond.num_bonds = 1;
+			bond.engines[0] = ci[1];
+
+			balancer.base.next_extension = to_user_pointer(&bond);
+			balancer.engine_index = 0;
+			balancer.num_siblings = count;
+			memcpy(balancer.engines, ci, count * sizeof(*ci));
+
+			memset(&engines, 0, sizeof(engines));
+			engines.engines[0].engine_class = I915_ENGINE_CLASS_INVALID;
+			engines.engines[0].engine_instance = I915_ENGINE_CLASS_INVALID_NONE;
+			engines.extensions = to_user_pointer(&balancer);
+
+			p.size = (sizeof(struct i915_context_param_engines) +
+				  sizeof(*engines.engines));
+
+			igt_assert_eq(__set_param_fresh_context(i915, p), -EINVAL);
+		}
+
 		free(ci);
 	}
 }