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Posted to dev@hc.apache.org by "Hunter Presnall (Jira)" <ji...@apache.org> on 2019/10/08 17:44:00 UTC
[jira] [Created] (HTTPCORE-605) Infinite loop on half close
Hunter Presnall created HTTPCORE-605:
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Summary: Infinite loop on half close
Key: HTTPCORE-605
URL: https://issues.apache.org/jira/browse/HTTPCORE-605
Project: HttpComponents HttpCore
Issue Type: Bug
Components: HttpCore NIO
Affects Versions: 4.4.11
Reporter: Hunter Presnall
When the server half-closes the connection, the http client gets stuck in an infinite loop with a writable selection key, but no data to send. They selection key is never cleared and empty buffers are continually sent.
The stack trace when this happens is:
{{"I/O dispatcher 2" #30 prio=5 os_prio=0 tid=0x00007fd7cc0a5000 nid=0x2c runnable [0x00007fd7db6fb000]"I/O dispatcher 2" #30 prio=5 os_prio=0 tid=0x00007fd7cc0a5000 nid=0x2c runnable [0x00007fd7db6fb000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.NativeThread.current(Native Method) at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:468) - locked <0x0000000091fb63b0> (a java.lang.Object) - locked <0x0000000091fb63a0> (a java.lang.Object) at org.apache.http.nio.reactor.ssl.SSLIOSession.sendEncryptedData(SSLIOSession.java:423) at org.apache.http.nio.reactor.ssl.SSLIOSession.outboundTransport(SSLIOSession.java:549) - locked <0x0000000091fb6630> (a org.apache.http.nio.reactor.ssl.SSLIOSession) at org.apache.http.impl.nio.reactor.AbstractIODispatch.outputReady(AbstractIODispatch.java:154) at org.apache.http.impl.nio.reactor.BaseIOReactor.writable(BaseIOReactor.java:188) at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:341) at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315) at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276) at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104) at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591) at java.lang.Thread.run(Thread.java:748)}}
This is similar to [HTTPCORE-528|https://issues.apache.org/jira/browse/HTTPCORE-528] which was fixed in 4.4.10. When we upgraded the client to 4.4.11, this new issue appeared. I suspect similar handling where there is write interest but no data needs to remove the write mask.
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