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Posted to dev@hc.apache.org by "Oleg Kalnichevski (Jira)" <ji...@apache.org> on 2019/10/23 09:16:01 UTC
[jira] [Resolved] (HTTPASYNC-154) Deadlock (?) when using
HttpAsyncClient in Java 11
[ https://issues.apache.org/jira/browse/HTTPASYNC-154?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Oleg Kalnichevski resolved HTTPASYNC-154.
-----------------------------------------
Resolution: Cannot Reproduce
[~MadEgg] I cannot do much about this issue without a reproducer or at least a connection manager log. Please re-open once there is more information.
Oleg
> Deadlock (?) when using HttpAsyncClient in Java 11
> --------------------------------------------------
>
> Key: HTTPASYNC-154
> URL: https://issues.apache.org/jira/browse/HTTPASYNC-154
> Project: HttpComponents HttpAsyncClient
> Issue Type: Bug
> Affects Versions: 4.1.4
> Environment: Ubuntu 19.04 amd64
> openjdk-8-jdk ~8u222-b10-1ubuntu1~19.04.1
> openjdk-11-jdk ~11.0.4+11-1ubuntu2~19.04
> Reporter: Egbert
> Priority: Minor
>
> I'm working on with a Java Webcrawler based on HttpAsyncClient, and I've encountered a situation where a deadlock occurs in Java 11, where it does not in Java 8. The software is based on a fork of crawler4j, jcrawler ([ https://bintray.com/pointpro/jcrawler/JCrawler#files/nl%2Fpointpro%2Fjcrawler%2F2.0.0-snapshot-201910090600|https://bintray.com/pointpro/jcrawler/JCrawler#files/nl%2Fpointpro%2Fjcrawler%2F2.0.0-snapshot-201910090600] to be exact)
> The lock occurs in `org.apache.http.nio.pool.AbstractNIOConnPool#lease(T, java.lang.Object, long, long, java.util.concurrent.TimeUnit, org.apache.http.concurrent.FutureCallback<E>)` on line 278 where the `ReentrantLock` `lock` is locked.
> A set of several dozen pages is fetched successfully, but after the 20th request, it just hangs there. A created a thread dump that shows the thread is waiting to lock, but the thread dump doesn't show any other thread locking this lock. It never acquires the lock - it just waits there indefinitely. I left it running for an hour or so before killing it. The lock AbstractNIOConnPool is waiting for never becomes available but no other thread seems to have locked it.
> I'm not sure where to begin gathering more information on this issue. The two versions I've tried are:
> openjdk-8-jdk ~8u222-b10-1ubuntu1~19.04.1
> and
> openjdk-11-jdk ~11.0.4+11-1ubuntu2~19.04
> I'm willing to collect additional information but I can see so many directions in where I can debug that I don't know where to start.
> I've switched back to Java 8 for now.
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