When debugging in Android Studio, in certain scenarios the app crashes with following exception:

08-27 18:01:25.144  19241-24656/? E/AndroidRuntime﹕ FATAL EXCEPTION: pool-7-thread-1
Process: com.callsign.android.dev, PID: 19241
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:1991)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2025)
        at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:410)
        at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1035)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1097)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
        at java.lang.Thread.run(Thread.java:820)

This happens

  • only when debugging
  • only on certain devices (i.e. Moto G, Nexus 4)

It does not happen on Oneplus One or Xperia L for example.

I haven't found any other information to help us identify the problem. Anybody else running into this issue?

  • 3
    I am currently seeing this issue on Genymotion emulated devices as well. Unfortunately, I don't have any insight into the issue. Aug 28, 2015 at 21:48
  • I got the same problem on Samsung
    – K.Sopheak
    Dec 19, 2016 at 7:04
  • I am facing same issue on but not only debug but also on live app. if anybody can help it would be appreciated Feb 20, 2017 at 9:14
  • Is this issue coming after you stop execution on break point?
    – Rahul
    Aug 1, 2017 at 17:18
  • It can be confuse, but, when you're debugging, make you sure don't have any variable handle on debug console. Aug 28, 2017 at 17:24

1 Answer 1


Try Async Task or for your part of code. "AbstractQueuedSynchronizer" looks Synchronizing problem.

public class Task extends AsyncTask<Void, Void, Void>
        protected void onPreExecute() {

        protected Void doInBackground(Void... paths) {
            //here your code (approx from line 400 to 850)
           return null;

        protected void onPostExecute(Void result) {

for call Task on button click or from any other method

new Task().execute();

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