From 1b06f3f0ae3302ddea845c9c71608b2abaa4cd0b Mon Sep 17 00:00:00 2001
From: Yegor Jbanov <yjbanov@google.com>
Date: Thu, 18 Aug 2016 16:53:38 -0700
Subject: [PATCH] self-destruct when a task goes bad

The Dart VM sometimes retains phantom "ports" and is unable to exit
when child processes are force-quit.
---
 agent/lib/src/commands/run.dart | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/agent/lib/src/commands/run.dart b/agent/lib/src/commands/run.dart
index 707e5c0ea5..cac6909319 100644
--- a/agent/lib/src/commands/run.dart
+++ b/agent/lib/src/commands/run.dart
@@ -77,6 +77,14 @@ class RunCommand extends Command {
     } finally {
       await forceQuitRunningProcesses();
     }
+
+    if (exitCode != 0) {
+      // Force-quitting child processes sometimes causes the Dart VM to fail to
+      // exit. So we give a 2-second grace period for any pending cleanups, then
+      // self-destruct.
+      await new Future<Null>.delayed(const Duration(seconds: 2));
+      exit(exitCode);
+    }
   }
 }