messaging: Shutdown on stop() if it wasn't shut down earlier

All rpc::client objects have to be stopped before they are
destroyed. Currently this is done in
messaging_service::shutdown(). The cql_test_env does not call
shutdown() currently. This can lead to use-after-free on the
rpc::client object, manifesting like this:

Segmentation fault on shard 0.
Backtrace:
column_mapping::~column_mapping() at schema.cc:?
db::cql_table_large_data_handler::internal_record_large_cells(sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long) const at ./db/large_data_handler.cc:180
operator() at ./db/large_data_handler.cc:123
 (inlined by) seastar::future<void> std::__invoke_impl<seastar::future<void>, db::cql_table_large_data_handler::cql_table_large_data_handler(gms::feature_service&, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>)::$_1&, sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long>(std::__invoke_other, db::cql_table_large_data_handler::cql_table_large_data_handler(gms::feature_service&, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>)::$_1&, sstables::sstable const&, sstables::key const&, clustering_key_prefix const*&&, column_definition const&, unsigned long&&, unsigned long&&) at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/invoke.h:61
 (inlined by) std::enable_if<is_invocable_r_v<seastar::future<void>, db::cql_table_large_data_handler::cql_table_large_data_handler(gms::feature_service&, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>)::$_1&, sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long>, seastar::future<void> >::type std::__invoke_r<seastar::future<void>, db::cql_table_large_data_handler::cql_table_large_data_handler(gms::feature_service&, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>)::$_1&, sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long>(db::cql_table_large_data_handler::cql_table_large_data_handler(gms::feature_service&, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>)::$_1&, sstables::sstable const&, sstables::key const&, clustering_key_prefix const*&&, column_definition const&, unsigned long&&, unsigned long&&) at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/invoke.h:114
 (inlined by) std::_Function_handler<seastar::future<void> (sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long), db::cql_table_large_data_handler::cql_table_large_data_handler(gms::feature_service&, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>, utils::updateable_value<unsigned int>)::$_1>::_M_invoke(std::_Any_data const&, sstables::sstable const&, sstables::key const&, clustering_key_prefix const*&&, column_definition const&, unsigned long&&, unsigned long&&) at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/std_function.h:290
std::function<seastar::future<void> (sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long)>::operator()(sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long) const at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/std_function.h:591
 (inlined by) db::cql_table_large_data_handler::record_large_cells(sstables::sstable const&, sstables::key const&, clustering_key_prefix const*, column_definition const&, unsigned long, unsigned long) const at ./db/large_data_handler.cc:175
seastar::rpc::log_exception(seastar::rpc::connection&, seastar::log_level, char const*, std::__exception_ptr::exception_ptr) at ./build/release/seastar/./seastar/src/rpc/rpc.cc:109
operator() at ./build/release/seastar/./seastar/src/rpc/rpc.cc:788
operator() at ./build/release/seastar/./seastar/include/seastar/core/future.hh:1682
 (inlined by) void seastar::futurize<seastar::future<void> >::satisfy_with_result_of<seastar::future<void>::then_wrapped_nrvo<seastar::future<void>, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14>(seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&&)::{lambda(seastar::internal::promise_base_with_type<void>&&, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&, seastar::future_state<seastar::internal::monostate>&&)#1}::operator()(seastar::internal::promise_base_with_type<void>&&, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&, seastar::future_state<seastar::internal::monostate>&&) const::{lambda()#1}>(seastar::internal::promise_base_with_type<void>&&, seastar::future<void>::then_wrapped_nrvo<seastar::future<void>, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14>(seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&&)::{lambda(seastar::internal::promise_base_with_type<void>&&, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&, seastar::future_state<seastar::internal::monostate>&&)#1}::operator()(seastar::internal::promise_base_with_type<void>&&, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&, seastar::future_state<seastar::internal::monostate>&&) const::{lambda()#1}&&) at ./build/release/seastar/./seastar/include/seastar/core/future.hh:2134
 (inlined by) operator() at ./build/release/seastar/./seastar/include/seastar/core/future.hh:1681
 (inlined by) seastar::continuation<seastar::internal::promise_base_with_type<void>, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14, seastar::future<void>::then_wrapped_nrvo<seastar::future<void>, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14>(seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&&)::{lambda(seastar::internal::promise_base_with_type<void>&&, seastar::rpc::client::client(seastar::rpc::logger const&, void*, seastar::rpc::client_options, seastar::socket, seastar::socket_address const&, seastar::socket_address const&)::$_14&, seastar::future_state<seastar::internal::monostate>&&)#1}, void>::run_and_dispose() at ./build/release/seastar/./seastar/include/seastar/core/future.hh:781
seastar::reactor::run_tasks(seastar::reactor::task_queue&) at ./build/release/seastar/./seastar/src/core/reactor.cc:2319
 (inlined by) seastar::reactor::run_some_tasks() at ./build/release/seastar/./seastar/src/core/reactor.cc:2756
seastar::reactor::do_run() at ./build/release/seastar/./seastar/src/core/reactor.cc:2925
seastar::reactor::run() at ./build/release/seastar/./seastar/src/core/reactor.cc:2808
seastar::app_template::run_deprecated(int, char**, std::function<void ()>&&) at ./build/release/seastar/./seastar/src/core/app-template.cc:265
seastar::app_template::run(int, char**, std::function<seastar::future<int> ()>&&) at ./build/release/seastar/./seastar/src/core/app-template.cc:156
operator() at ./build/release/seastar/./seastar/src/testing/test_runner.cc:75
 (inlined by) void std::__invoke_impl<void, seastar::testing::test_runner::start_thread(int, char**)::$_0&>(std::__invoke_other, seastar::testing::test_runner::start_thread(int, char**)::$_0&) at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/invoke.h:61
 (inlined by) std::enable_if<is_invocable_r_v<void, seastar::testing::test_runner::start_thread(int, char**)::$_0&>, void>::type std::__invoke_r<void, seastar::testing::test_runner::start_thread(int, char**)::$_0&>(seastar::testing::test_runner::start_thread(int, char**)::$_0&) at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/invoke.h:111
 (inlined by) std::_Function_handler<void (), seastar::testing::test_runner::start_thread(int, char**)::$_0>::_M_invoke(std::_Any_data const&) at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/std_function.h:290
std::function<void ()>::operator()() const at /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/std_function.h:591
 (inlined by) seastar::posix_thread::start_routine(void*) at ./build/release/seastar/./seastar/src/core/posix.cc:73

Fix by making sure that shutdown() is called prior to destruction.

Fixes scylladb#12244

Closes scylladb#12276

message/messaging_service.cc

@@ -444,6 +444,11 @@ future<> messaging_service::shutdown() {
 }
 
 future<> messaging_service::stop() {
+    if (!_shutting_down) {
+        return shutdown().then([this] {
+            return stop();
+        });
+    }
     return unregister_handler(messaging_verb::CLIENT_ID).then([this] {
         if (_rpc->has_handlers()) {
             mlogger.error("RPC server still has handlers registered");