diff --git a/scripts/test.sh b/scripts/test.sh
index 4523e32df..11c86056b 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -146,6 +146,12 @@ function generic_checker {
   fi
 }
 
+function killall_functional_test {
+  log_callout "Killing all etcd-agent and etcd processes..."
+  killall -9 etcd-agent
+  killall -9 etcd
+}
+
 function functional_pass {
   run ./tests/functional/build.sh || exit 1
 
@@ -166,32 +172,32 @@ function functional_pass {
     done
   done
 
+  trap killall_functional_test INT
+
   log_callout "functional test START!"
   run ./bin/etcd-tester --config ./tests/functional/functional.yaml -test.v && log_success "'etcd-tester' succeeded"
   local etcd_tester_exit_code=$?
 
-  if [[ "${etcd_tester_exit_code}" -ne "0" ]]; then
-    log_error "ETCD_TESTER_EXIT_CODE:" ${etcd_tester_exit_code}
-    exit 1
-  fi
-
   # shellcheck disable=SC2206
   agent_pids=($agent_pids)
   kill -s TERM "${agent_pids[@]}" || true
 
   if [[ "${etcd_tester_exit_code}" -ne "0" ]]; then
+    log_error "ETCD_TESTER_EXIT_CODE:" ${etcd_tester_exit_code}
+
     log_error -e "\\nFAILED! 'tail -1000 /tmp/etcd-functional-1/etcd.log'"
-    tail -1000 /tmp/etcd-functional-1/etcd.log
+    tail -100 /tmp/etcd-functional-1/etcd.log
 
     log_error -e "\\nFAILED! 'tail -1000 /tmp/etcd-functional-2/etcd.log'"
-    tail -1000 /tmp/etcd-functional-2/etcd.log
+    tail -100 /tmp/etcd-functional-2/etcd.log
 
     log_error -e "\\nFAILED! 'tail -1000 /tmp/etcd-functional-3/etcd.log'"
-    tail -1000 /tmp/etcd-functional-3/etcd.log
+    tail -100 /tmp/etcd-functional-3/etcd.log
 
     log_error "--- FAIL: exit code" ${etcd_tester_exit_code}
-    return ${etcd_tester_exit_code}
+    exit ${etcd_tester_exit_code}
   fi
+
   log_success "functional test PASS!"
 }
 
diff --git a/tests/functional/agent/server.go b/tests/functional/agent/server.go
index 81bdec5ab..f76f7258c 100644
--- a/tests/functional/agent/server.go
+++ b/tests/functional/agent/server.go
@@ -19,7 +19,6 @@ import (
 	"net"
 	"os"
 	"os/exec"
-	"strings"
 
 	"go.etcd.io/etcd/pkg/v3/proxy"
 	"go.etcd.io/etcd/server/v3/embed"
@@ -102,17 +101,16 @@ func (srv *Server) StartServe() error {
 		zap.String("listener-address", srv.ln.Addr().String()),
 	)
 	err = srv.grpcServer.Serve(srv.ln)
-	if err != nil && strings.Contains(err.Error(), "use of closed network connection") {
-		srv.lg.Info(
-			"gRPC server is shut down",
+	if err != nil {
+		srv.lg.Warn(
+			"gRPC server is stopped with error",
 			zap.String("address", srv.address),
 			zap.Error(err),
 		)
 	} else {
-		srv.lg.Warn(
-			"gRPC server returned with error",
+		srv.lg.Info(
+			"gRPC server is stopped",
 			zap.String("address", srv.address),
-			zap.Error(err),
 		)
 	}
 	return err