matrix can't be in parallel

Jenkinsfile

@@ -111,6 +111,36 @@ pipeline {
         }
       }
 
+      stage('large test models') {
+        matrix {
+          agent { dockerfile { filename 'Dockerfile.openpilot_base'; args '--user=root' } }
+          axes {
+            axis {
+              name 'JOB_ID'
+              values 0, 1, 2, 3, 4
+            }
+          }
+
+          stages {
+            stage('start large test models') {
+              steps {
+                sh "git config --global --add safe.directory '*'"
+                sh "git submodule update --init --depth=1 --recursive"
+                sh "scons -j42"
+                sh "cd selfdrive/car/tests && PYTHONPATH='${WORKSPACE}' JOB_ID=${JOB_ID} NUM_JOBS=5 INTERNAL_SEG_LIST='selfdrive/car/tests/test_models_segs.txt' ./test_models.py"
+              }
+            }
+          }
+        }
+
+        post {
+          always {
+            sh "rm -rf ${WORKSPACE}/* || true"
+            sh "rm -rf .* || true"
+          }
+        }
+      }
+
       parallel {
 
         /*
@@ -143,35 +173,7 @@ pipeline {
         }
         */
 
-        stage('large test models') {
-          matrix {
-            agent { dockerfile { filename 'Dockerfile.openpilot_base'; args '--user=root' } }
-            axes {
-              axis {
-                name 'JOB_ID'
-                values 0, 1, 2, 3, 4
-              }
-            }
-
-            stages {
-              stage('start large test models') {
-                steps {
-                  sh "git config --global --add safe.directory '*'"
-                  sh "git submodule update --init --depth=1 --recursive"
-                  sh "scons -j42"
-                  sh "cd selfdrive/car/tests && PYTHONPATH='${WORKSPACE}' JOB_ID=${JOB_ID} NUM_JOBS=5 INTERNAL_SEG_LIST='selfdrive/car/tests/test_models_segs.txt' ./test_models.py"
-                }
-              }
-            }
-          }
 
-          post {
-            always {
-              sh "rm -rf ${WORKSPACE}/* || true"
-              sh "rm -rf .* || true"
-            }
-          }
-        }
 
 //         stage('scons build test') {
 //           agent {