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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