[runtime] Make sigterm dumper send file to merp (#9608)

mono/mini/mini-posix.c

@@ -227,12 +227,20 @@ MONO_SIG_HANDLER_FUNC (static, sigterm_signal_handler)
 	// die. The dump ends with the exit(1) below
 	MonoContext mctx;
 	gchar *output = NULL;
+	MonoStackHash hashes;
 	mono_sigctx_to_monoctx (ctx, &mctx);
-	if (!mono_threads_summarize (&mctx, &output, NULL))
+	if (!mono_threads_summarize (&mctx, &output, &hashes))
 		g_assert_not_reached ();
 
-	// Only the dumping-supervisor thread exits mono_thread_summarize
-	MOSTLY_ASYNC_SAFE_PRINTF("Unhandled exception dump: \n######\n%s\n######\n", output);
+	if (mono_merp_enabled ()) {
+		pid_t crashed_pid = getpid ();
+		char *full_version = mono_get_runtime_build_info ();
+		mono_merp_invoke (crashed_pid, "SIGTERM", output, &hashes, full_version);
+	} else {
+		// Only the dumping-supervisor thread exits mono_thread_summarize
+		MOSTLY_ASYNC_SAFE_PRINTF("Unhandled exception dump: \n######\n%s\n######\n", output);
+		sleep (3);
+	}
 
 	mono_chain_signal (MONO_SIG_HANDLER_PARAMS);
 	exit (1);

mono/utils/mono-merp.c

@@ -173,8 +173,8 @@ get_merp_exctype (MERPExcType exc)
 		case MERP_EXC_HANG: 
 			return "0x02000000";
 		case MERP_EXC_NONE:
-			// Exception type is optional
-			return "";
+			// Exception type documented as optional, not optional
+			g_assert_not_reached ();
 		default:
 			g_assert_not_reached ();
 	}
@@ -195,6 +195,11 @@ parse_exception_type (const char *signal)
 	if (!strcmp (signal, "SIGABRT"))
 		return MERP_EXC_SIGABRT;
 
+	// Force quit == hang?
+	// We need a default for this
+	if (!strcmp (signal, "SIGTERM"))
+		return MERP_EXC_HANG;
+
 	// FIXME: There are no other such signal
 	// strings passed to mono_handle_native_crash at the
 	// time of writing this