From c1f0bc310d4e85b7cc102c209ac9fb7fd4e0fc2f Mon Sep 17 00:00:00 2001
From: Alexander Aprelev <aam@google.com>
Date: Fri, 12 Jun 2020 03:29:17 +0000
Subject: [PATCH] [vm/concurrency] When waking up ThreadInterrupter first check
 if it is shutdown already.

Fixes https://github.com/dart-lang/sdk/issues/42302

Change-Id: Ic250ce6d23d20d0435447c4e3ba546c1755c0458
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151024
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
---
 runtime/vm/thread_interrupter.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/runtime/vm/thread_interrupter.cc b/runtime/vm/thread_interrupter.cc
index 6f57f4fc205..be990abb53a 100644
--- a/runtime/vm/thread_interrupter.cc
+++ b/runtime/vm/thread_interrupter.cc
@@ -146,6 +146,10 @@ void ThreadInterrupter::WakeUp() {
   }
   {
     MonitorLocker ml(monitor_);
+    if (shutdown_) {
+      // Late call
+      return;
+    }
     if (!initialized_) {
       // Early call.
       return;