$ colcon build --packages-up-to rclcpp --symlink-install --cmake-args -DCMAKE_BUILD_TYPE=Debug
$ source install/setup.bash
$ valgrind --leak-check=full ./build/rclcpp/test/test_subscription

==190768== 
==190768== HEAP SUMMARY:
==190768==     in use at exit: 46,900 bytes in 100 blocks
==190768==   total heap usage: 10,538 allocs, 10,438 frees, 4,416,678 bytes allocated
==190768== 
==190768== 144 (56 direct, 88 indirect) bytes in 1 blocks are definitely lost in loss record 24 of 34
==190768==    at 0x483F7F3: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==190768==    by 0x50FBF46: __default_allocate (allocator.c:37)
==190768==    by 0x508B690: __rcl_guard_condition_init_from_rmw_impl (guard_condition.c:73)
==190768==    by 0x508B842: rcl_guard_condition_init (guard_condition.c:108)
==190768==    by 0x4F20E4E: rclcpp::experimental::SubscriptionIntraProcess<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void>, std::default_delete<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >, rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >::SubscriptionIntraProcess(rclcpp::AnySubscriptionCallback<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void> >, std::shared_ptr<std::allocator<void> >, std::shared_ptr<rclcpp::Context>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rmw_qos_profile_t, rclcpp::IntraProcessBufferType) (subscription_intra_process.hpp:86)
==190768==    by 0x4F1F8A3: void __gnu_cxx::new_allocator<rclcpp::experimental::SubscriptionIntraProcess<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void>, std::default_delete<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >, rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > > >::construct<rclcpp::experimental::SubscriptionIntraProcess<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void>, std::default_delete<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >, rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >, rclcpp::AnySubscriptionCallback<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void> >&, std::shared_ptr<std::allocator<void> >, std::shared_ptr<rclcpp::Context>&, char const*, rmw_qos_profile_t&, rclcpp::IntraProcessBufferType>(rclcpp::experimental::SubscriptionIntraProcess<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void>, std::default_delete<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >, rcl_interfaces::msg::ParameterEvent_<std::allocator<void> > >*, rclcpp::AnySubscriptionCallback<rcl_interfaces::msg::ParameterEvent_<std::allocator<void> >, std::allocator<void> >&, std::shared_ptr<std::allocator<void> >&&, std::shared_ptr<rclcpp::Context>&, char const*&&, rmw_qos_profile_t&, rclcpp::IntraProcessBufferType&&) (new_allocator.h:147)
...