Thread "blocked" on ResultCallbackTemplate.close

Sometimes, I have builds hanging infinitly on my CI machine with the following stack trace:

"main" #1 prio=5 os_prio=0 cpu=4130622.05ms elapsed=4134.60s tid=0x00007f7484011800 nid=0x62db runnable  [0x00007f7489a8a000]
   java.lang.Thread.State: RUNNABLE
	at org.testcontainers.shaded.okio.Buffer.indexOf(Buffer.java:1475)
	at org.testcontainers.shaded.okio.RealBufferedSource.indexOf(RealBufferedSource.java:352)
	at org.testcontainers.shaded.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:230)
	at org.testcontainers.shaded.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:224)
	at org.testcontainers.shaded.okhttp3.internal.http1.Http1ExchangeCodec$ChunkedSource.readChunkSize(Http1ExchangeCodec.java:489)
	at org.testcontainers.shaded.okhttp3.internal.http1.Http1ExchangeCodec$ChunkedSource.read(Http1ExchangeCodec.java:471)
	at org.testcontainers.shaded.okhttp3.internal.Util.skipAll(Util.java:204)
	at org.testcontainers.shaded.okhttp3.internal.Util.discard(Util.java:186)
	at org.testcontainers.shaded.okhttp3.internal.http1.Http1ExchangeCodec$ChunkedSource.close(Http1ExchangeCodec.java:511)
	at org.testcontainers.shaded.okio.ForwardingSource.close(ForwardingSource.java:43)
	at org.testcontainers.shaded.okhttp3.internal.connection.Exchange$ResponseBodySource.close(Exchange.java:313)
	at org.testcontainers.shaded.okio.RealBufferedSource.close(RealBufferedSource.java:476)
	at org.testcontainers.shaded.okhttp3.internal.Util.closeQuietly(Util.java:139)
	at org.testcontainers.shaded.okhttp3.ResponseBody.close(ResponseBody.java:192)
	at org.testcontainers.shaded.okhttp3.Response.close(Response.java:290)
	at org.testcontainers.shaded.com.github.dockerjava.okhttp.OkDockerHttpClient$OkResponse.close(OkDockerHttpClient.java:285)
	at org.testcontainers.shaded.com.github.dockerjava.core.DefaultInvocationBuilder.lambda$null$0(DefaultInvocationBuilder.java:272)
	at org.testcontainers.shaded.com.github.dockerjava.core.DefaultInvocationBuilder$$Lambda$761/0x00000008006c9040.close(Unknown Source)
	at com.github.dockerjava.api.async.ResultCallbackTemplate.close(ResultCallbackTemplate.java:77)
	at org.testcontainers.utility.ResourceReaper.start(ResourceReaper.java:202)
	at org.testcontainers.DockerClientFactory.client(DockerClientFactory.java:205)
	- locked <0x000000012dac0658> (a [Ljava.lang.Object;)
	at org.testcontainers.LazyDockerClient.getDockerClient(LazyDockerClient.java:14)
	at org.testcontainers.LazyDockerClient.authConfig(LazyDockerClient.java:12)
	at org.testcontainers.containers.GenericContainer.start(GenericContainer.java:310)
	at com.cos.framework.core.data_test.postgres.PostgresTestServer.<init>(PostgresTestServer.java:73)

Here is the full jstack: test-container-jstack.txt

Start with the provided stack trace, particularly com.github.dockerjava.api.async.ResultCallbackTemplate.close and org.testcontainers.utility.ResourceReaper.start. Review the referenced jstack and trace the Docker client response-closing path through the shaded OkHttp classes. Done means reproducing or explaining the CI hang and establishing that this close path no longer blocks indefinitely.