diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index d811e268a..66e58798a 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -13,7 +13,6 @@ defaults:
     shell: bash
 env:
   PUB_ENVIRONMENT: bot.github
-  FORCE_TEST_EXIT: true
 
 jobs:
   job_001:
diff --git a/mono_repo.yaml b/mono_repo.yaml
index dc1264e8c..6f8a7da44 100644
--- a/mono_repo.yaml
+++ b/mono_repo.yaml
@@ -2,8 +2,6 @@
 self_validate: analyze_and_format
 
 github:
-  env:
-    FORCE_TEST_EXIT: true
   # Setting just `cron` keeps the defaults for `push` and `pull_request`
   cron: '0 0 * * 0' # “At 00:00 (UTC) on Sunday.”
   on_completion:
diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index c527a3a20..66b7a00da 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 1.17.10-dev
+
 ## 1.17.9
 
 * Fix a bug where a tag level configuration would cause test suites with that
diff --git a/pkgs/test/pubspec.yaml b/pkgs/test/pubspec.yaml
index c057e5c35..be4babaff 100644
--- a/pkgs/test/pubspec.yaml
+++ b/pkgs/test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 1.17.9
+version: 1.17.10-dev
 description: >-
   A full featured library for writing and running Dart tests across platforms.
 repository: https://github.com/dart-lang/test/blob/master/pkgs/test
@@ -34,7 +34,7 @@ dependencies:
   yaml: ^3.0.0
   # Use an exact version until the test_api and test_core package are stable.
   test_api: 0.4.1
-  test_core: 0.3.29
+  test_core: 0.3.30
 
 dev_dependencies:
   fake_async: ^1.0.0
diff --git a/pkgs/test/test/runner/runner_test.dart b/pkgs/test/test/runner/runner_test.dart
index 66d4fe4c0..0386fbfef 100644
--- a/pkgs/test/test/runner/runner_test.dart
+++ b/pkgs/test/test/runner/runner_test.dart
@@ -714,8 +714,7 @@ void main(List<String> args) async {
   test.completeShutdown();
 }''').create();
       var test = await runDart(['runner.dart', '--no-color', '--', 'test.dart'],
-          description: 'dart runner.dart -- test.dart',
-          environment: {'FORCE_TEST_EXIT': 'false'});
+          description: 'dart runner.dart -- test.dart');
       expect(
           test.stdout,
           emitsThrough(containsInOrder([
diff --git a/pkgs/test_core/CHANGELOG.md b/pkgs/test_core/CHANGELOG.md
index 60ad7425e..1a6935912 100644
--- a/pkgs/test_core/CHANGELOG.md
+++ b/pkgs/test_core/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.3.30-dev
+
+* Remove support for `FORCE_TEST_EXIT`.
+
 ## 0.3.29
 
 * Fix a bug where a tag level configuration would cause test suites with that
diff --git a/pkgs/test_core/lib/src/executable.dart b/pkgs/test_core/lib/src/executable.dart
index 309bdedfe..23fcd33fe 100644
--- a/pkgs/test_core/lib/src/executable.dart
+++ b/pkgs/test_core/lib/src/executable.dart
@@ -166,12 +166,6 @@ Future<void> _execute(List<String> args) async {
     await runner?.close();
   }
 
-  // TODO(grouma) - figure out why the executable can hang in the travis
-  // environment. https://github.com/dart-lang/test/issues/599
-  if (Platform.environment['FORCE_TEST_EXIT'] == 'true') {
-    exit(exitCode);
-  }
-
   return;
 }
 
diff --git a/pkgs/test_core/lib/src/runner/spawn_hybrid.dart b/pkgs/test_core/lib/src/runner/spawn_hybrid.dart
index 28928284a..9b5b4a8e3 100644
--- a/pkgs/test_core/lib/src/runner/spawn_hybrid.dart
+++ b/pkgs/test_core/lib/src/runner/spawn_hybrid.dart
@@ -54,6 +54,7 @@ StreamChannel spawnHybridUri(String url, Object? message, Suite suite) {
       var disconnector = Disconnector();
       onExitPort.listen((_) {
         disconnector.disconnect();
+        port.close();
         onExitPort.close();
       });
 
@@ -62,6 +63,7 @@ StreamChannel spawnHybridUri(String url, Object? message, Suite suite) {
           .transformSink(StreamSinkTransformer.fromHandlers(handleDone: (sink) {
         // If the user closes the stream channel, kill the isolate.
         isolate.kill();
+        port.close();
         onExitPort.close();
         sink.close();
       }));
diff --git a/pkgs/test_core/lib/src/runner/vm/platform.dart b/pkgs/test_core/lib/src/runner/vm/platform.dart
index 636792d37..9b001cab0 100644
--- a/pkgs/test_core/lib/src/runner/vm/platform.dart
+++ b/pkgs/test_core/lib/src/runner/vm/platform.dart
@@ -63,6 +63,7 @@ class VMPlatform extends PlatformPlugin {
     StreamSubscription<Event>? eventSub;
     var channel = IsolateChannel.connectReceive(receivePort)
         .transformStream(StreamTransformer.fromHandlers(handleDone: (sink) {
+      receivePort.close();
       isolate!.kill();
       eventSub?.cancel();
       client?.dispose();
diff --git a/pkgs/test_core/pubspec.yaml b/pkgs/test_core/pubspec.yaml
index 7258db508..24878e187 100644
--- a/pkgs/test_core/pubspec.yaml
+++ b/pkgs/test_core/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test_core
-version: 0.3.29
+version: 0.3.30-dev
 description: A basic library for writing tests and running them on the VM.
 homepage: https://github.com/dart-lang/test/blob/master/pkgs/test_core