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https://issues.apache.org/jira/browse/CXF-9115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andriy Redko reassigned CXF-9115:
---------------------------------
Assignee: Andriy Redko
> Race Condition in HttpClientHttpConduit Causes Writing Thread to Hang Forever
> -----------------------------------------------------------------------------
>
> Key: CXF-9115
> URL: https://issues.apache.org/jira/browse/CXF-9115
> Project: CXF
> Issue Type: Bug
> Components: Transports
> Affects Versions: 4.1.0, 4.0.6
> Reporter: Kai Zander
> Assignee: Andriy Redko
> Priority: Major
> Attachments: screenshot-1.png
>
>
> It is possible for
> {{HttpClientHTTPConduit.HttpClientBodyPublisher#subscribe}} to be called
> _after_ the underlying subscription has already been cancelled, for example,
> if a connect timeout happens _before_
> {{HttpClientHTTPConduit.HttpClientBodyPublisher#subscribe}} is called.
> In this case, the writing thread will be stuck in
> {{HttpClientHTTPConduit.HttpClientPipedOutputStream#write}}, waiting forever
> for space in the write buffer.
> This happens every once in a while in our production system, causing it to
> hang. The threads are stuck here:
> {code}
> "demo.hw.client.ComplexClient.main()@4789" tid=0x3e nid=NA waiting
> java.lang.Thread.State: WAITING
> at java.lang.Object.wait0(Object.java:-1)
> at java.lang.Object.wait(Object.java:366)
> at java.io.PipedInputStream.awaitSpace(PipedInputStream.java:279)
> at java.io.PipedInputStream.receive(PipedInputStream.java:237)
> at java.io.PipedOutputStream.write(PipedOutputStream.java:154)
> at
> org.apache.cxf.transport.http.HttpClientHTTPConduit$HttpClientPipedOutputStream.write(HttpClientHTTPConduit.java:554)
> at
> org.apache.cxf.io.AbstractWrappedOutputStream.write(AbstractWrappedOutputStream.java:51)
> at
> org.apache.cxf.io.AbstractThresholdOutputStream.write(AbstractThresholdOutputStream.java:69)
> at com.ctc.wstx.io.UTF8Writer.flush(UTF8Writer.java:100)
> at
> com.ctc.wstx.sw.BufferingXmlWriter.flush(BufferingXmlWriter.java:242)
> at com.ctc.wstx.sw.BaseStreamWriter.flush(BaseStreamWriter.java:260)
> at
> org.apache.cxf.interceptor.AbstractOutDatabindingInterceptor.writeParts(AbstractOutDatabindingInterceptor.java:107)
> at
> org.apache.cxf.wsdl.interceptors.BareOutInterceptor.handleMessage(BareOutInterceptor.java:68)
> at
> org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
> - locked <0x2369> (a org.apache.cxf.phase.PhaseInterceptorChain)
> at org.apache.cxf.endpoint.ClientImpl.doInvoke(ClientImpl.java:530)
> at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:441)
> at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:356)
> at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:314)
> at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:334)
> at demo.hw.client.ComplexClient.main(ComplexClient.java:106)
> {code}
> The {{PipedInputStream}} looks like this (so it is connected, but doesn't yet
> have a thread registered as the {{readSide}}, and never will have one. It
> therefore doesn't consider the read end to be gone/dead and keeps looping
> forever in {{awaitSpace()}}):
> !screenshot-1.png!
> I can reproduce this issue every time by
> # Placing a breakpoint in this line:
> https://github.com/apache/cxf/blob/7fb95ad266e4a5ced561a0dc56c038db43967ca4/rt/transports/http/src/main/java/org/apache/cxf/transport/http/HttpClientHTTPConduit.java#L637
> # sending a request with a body that is larger than the chunking threshold
> (4096 bytes by default), and larger than the chunk length,
> # waiting for the breakpoint to be hit,
> # then waiting for the connect timeout to be exceeded (30s by default),
> # then resuming the program.
> I recommend running with
> {{-Djdk.httpclient.HttpClient.log=errors,requests,headers,frames:control:data:window,ssl,trace,channel}}.
> That way we can see debug logs printed by the {{HttpClient}} that tell us
> when timeouts happen and subscriptions are being cancelled.
> As a reproducer project, you can use the [wsdl_first_dynamic_client
> sample|https://github.com/apache/cxf/tree/cxf-4.1.0/distribution/src/main/release/samples/wsdl_first_dynamic_client],
> with the following modification in the client to trigger chunking, and to
> have the timeouts happen a little sooner:
> {code}
> Index:
> distribution/src/main/release/samples/wsdl_first_dynamic_client/src/main/java/demo/hw/client/ComplexClient.java
> IDEA additional info:
> Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
> <+>UTF-8
> ===================================================================
> diff --git
> a/distribution/src/main/release/samples/wsdl_first_dynamic_client/src/main/java/demo/hw/client/ComplexClient.java
>
> b/distribution/src/main/release/samples/wsdl_first_dynamic_client/src/main/java/demo/hw/client/ComplexClient.java
> ---
> a/distribution/src/main/release/samples/wsdl_first_dynamic_client/src/main/java/demo/hw/client/ComplexClient.java
> (revision 7fb95ad266e4a5ced561a0dc56c038db43967ca4)
> +++
> b/distribution/src/main/release/samples/wsdl_first_dynamic_client/src/main/java/demo/hw/client/ComplexClient.java
> (date 1741191623466)
> @@ -35,6 +35,7 @@
> import org.apache.cxf.service.model.BindingOperationInfo;
> import org.apache.cxf.service.model.MessagePartInfo;
> import org.apache.cxf.service.model.ServiceInfo;
> +import org.apache.cxf.transport.http.HTTPConduit;
>
> /**
> *
> @@ -70,6 +71,12 @@
> JaxWsDynamicClientFactory factory =
> JaxWsDynamicClientFactory.newInstance();
> Client client = factory.createClient(wsdlURL.toExternalForm(),
> SERVICE_NAME);
> ClientImpl clientImpl = (ClientImpl) client;
> + ((HTTPConduit)
> clientImpl.getConduit()).getClient().setChunkingThreshold(8);
> + ((HTTPConduit)
> clientImpl.getConduit()).getClient().setChunkLength(8);
> + ((HTTPConduit)
> clientImpl.getConduit()).getClient().setConnectionTimeout(5000);
> + ((HTTPConduit)
> clientImpl.getConduit()).getClient().setReceiveTimeout(5000);
> +
> +
> Endpoint endpoint = clientImpl.getEndpoint();
> ServiceInfo serviceInfo =
> endpoint.getService().getServiceInfos().get(0);
> QName bindingName = new QName("http://Company.com/Application";,
> {code}
> Start the server with {{mvn -Pserver}}, set the breakpoint as described above
> and start {{mvn -Pclient}} in the debugger. Once the breakpoint is hit, wait
> ~5 seconds and resume. The process will now hang forever.
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