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https://issues.apache.org/jira/browse/HTTPCORE-758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17768621#comment-17768621
 ] 

Oleg Kalnichevski commented on HTTPCORE-758:
--------------------------------------------

[~kbandi_0119] Thank you for contributing the fix. It has been merged into the 
4.4.x branch. Please do note I cannot promise a release from that branch soon 
or ever. Please do consider upgrading to HttpCore 5.2

Oleg

> Requests stuck in IOReactor queue due to fatal exceptions while creating IO 
> dispatchers
> ---------------------------------------------------------------------------------------
>
>                 Key: HTTPCORE-758
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-758
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore NIO
>    Affects Versions: 4.4.13
>         Environment: Library & version: Apache httpasyncclient - 4.1.4, 
> httpcore: 4.4.13,httpcore-nio: 4.4.10
> Operating System: Windows
> Runtime Environment: Java 1.8
>            Reporter: Karthik Bandi
>            Priority: Blocker
>
> Hi team,
> Requests are stuck in the requestQueue of IO Reactor 
> (DefaultConnectingIOReactor) but not processed due to abnormal termination of 
> I/O Reactor thread that processes the requests (started as part of calling 
> the start() in CloseableHttpAsyncClientBase).
> I've enabled http logging and collected the following error logs:
> {code:java}
> DEBUG 2023-09-18 10:16:38,706Z [parallel_; tid=11876601] [ 
> o.a.http.impl.nio.client.MainClientExec] : [exchange: 47975] start execution
> DEBUG 2023-09-18 10:16:38,706Z [parallel_; tid=11876601] [ 
> o.a.h.client.protocol.RequestAddCookies] : CookieSpec selected: standard
> DEBUG 2023-09-18 10:16:38,706Z [parallel_; tid=11876601] [ 
> o.a.h.client.protocol.RequestAuthCache] : Auth cache not set in the context
> DEBUG 2023-09-18 10:16:38,706Z [parallel_; tid=11876601] 
> [o.a.h.i.n.client.InternalHttpAsyncClient] : [exchange: 47975] Request 
> connection for {s}-> xxxxxxxxxxxxxxxxxxxxx
> DEBUG 2023-09-18 10:16:38,706Z [parallel_; tid=11876601] 
> [.n.c.PoolingNHttpClientConnectionManager] : Connection request: [route: 
> {s}->xxxxxxxxxxxxxxxxxxxxxxxxx][total kept alive: 0; route allocated: 0 of 2; 
> total allocated: 0 of 20]
> ERROR 2023-09-18 10:16:38,757Z [ pool-48041-thread-1] 
> [o.a.h.i.n.client.InternalHttpAsyncClient] : I/O reactor terminated abnormally
> org.apache.http.nio.reactor.IOReactorException: Failure opening selector
> at 
> org.apache.http.impl.nio.reactor.AbstractIOReactor.<init>(AbstractIOReactor.java:103)
> at 
> org.apache.http.impl.nio.reactor.BaseIOReactor.<init>(BaseIOReactor.java:85)
> at 
> org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:318)
> at 
> org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221)
> at 
> org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64)
> at java.lang.Thread.run(Thread.java:750)
> Caused by: java.io.IOException: Unable to establish loopback connection
> at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:94)
> at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:61)
> at java.security.AccessController.doPrivileged(Native Method)
> at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:171)
> at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
> at java.nio.channels.Pipe.open(Pipe.java:155)
> at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:142)
> at 
> sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
> at java.nio.channels.Selector.open(Selector.java:227)
> at 
> org.apache.http.impl.nio.reactor.AbstractIOReactor.<init>(AbstractIOReactor.java:101)
> ... 5 common frames omitted
> Caused by: java.net.SocketException: Socket operation on nonsocket: bind
> at sun.nio.ch.Net.bind0(Native Method)
> at sun.nio.ch.Net.bind(Net.java:461)
> at sun.nio.ch.Net.bind(Net.java:453)
> at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:222)
> at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:85)
> at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:78)
> at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:121)
> at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:76)
> ... 14 common frames omitted{code}
> I would like to know what is the cause for underlying exception:
> {code:java}
> Caused by: java.net.SocketException: Socket operation on nonsocket: bind{code}
> Is it environment issue that can be fixed with any configuration changes on 
> Windows system?
> If it is non-recoverable exception, why would the HttpAsyncClient doesn't 
> shutdown the connection manager and all relevant components and respond back 
> to the caller by calling the callback methods?
> Finally, Can I expect a fix for apache team on this issue? thanks.
> Same issue is reported in [Apache :: Requests stuck in queue due to 
> termination of I/O Reactor 
> (apachelounge.com)|https://www.apachelounge.com/viewtopic.php?t=9113]
> If there is something wrong in affect versions, please update them.



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