Error in asynchronous callback

HTTP4S 0.21.2 and 0.21.3 produce the following error (version 0.21.1 does not).

If you git clone this repository, update the build.sbt to use 0.21.2 and then hit sbt run you’ll see the errors on each request:

https://github.com/ljwagerfield/http4s-request-body-error

The error occurs in the background after calling Client[Task].fetch; the resulting Task[A] is not in a failed state, and the application appears to continue running as normal.

This happens on every request (these are a mix of GET, PUT and DELETE).

As mentioned, 0.21.1 is fine (does not exhibit the problem).

[ERROR] org.http4s.client.asynchttpclient.AsyncHttpClient - Error in asynchronous callback
monix.execution.exceptions.CallbackCalledMultipleTimesException: onSuccess
	at monix.eval.internal.TaskCreate$CallbackForCreate.onSuccess(TaskCreate.scala:196)
	at monix.execution.Callback.apply(Callback.scala:105)
	at monix.execution.Callback.apply(Callback.scala:82)
	at org.http4s.client.asynchttpclient.AsyncHttpClient$$anon$1.$anonfun$onCompleted$1(AsyncHttpClient.scala:126)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
	at monix.eval.internal.TaskRunLoop$.startFull(TaskRunLoop.scala:81)
	at monix.eval.internal.TaskRunLoop$.$anonfun$restartAsync$1(TaskRunLoop.scala:222)
	at monix.execution.schedulers.TracingRunnable.run(TracingRunnable.scala:33)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1429)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)

[rossabaker]

Excellent. This will be in 0.21.4, which I expect out early this week. Thanks for reporting and testing!

[rossabaker]

Okay, 0.21.3+63-2e9fd3ae-SNAPSHOT tests what I thought we were testing last round.

If that’s still not right, I’ve still got another idea.