Deadlock between SingleClientConnManager.releaseConnection() and
SingleClientConnManager.shutdown()
---------------------------------------------------------------------------------------------------
Key: HTTPCLIENT-1127
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1127
Project: HttpComponents HttpClient
Issue Type: Bug
Components: HttpClient
Affects Versions: 4.1.2
Reporter: Sebb
It's possible to create a deadlock within SingleClientConnectionManager.
When JMeter interrupts a test, it calls HttpUriRequest.abort(), and as part of
thread end processing it calls SingleClientConnManager.shutdown().
See deadlock details below.
I don't yet know why the shutdown is called before the abort finishes; that is
probably a bug.
However, there may be a issue with the locking strategy within SCCM, hence this
report.
"Thread-18":
at
org.apache.http.impl.conn.SingleClientConnManager.releaseConnection(SingleClientConnManager.java:258)
- waiting to lock <0x19e00118> (a
org.apache.http.impl.conn.SingleClientConnManager)
at
org.apache.http.impl.conn.AbstractClientConnAdapter.abortConnection(AbstractClientConnAdapter.java:323)
- locked <0x19e00148> (a
org.apache.http.impl.conn.SingleClientConnManager$ConnAdapter)
at
org.apache.http.client.methods.HttpRequestBase.abort(HttpRequestBase.java:161)
at
org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.interrupt(HTTPHC4Impl.java:1090)
at
org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.interrupt(HTTPSamplerProxy.java:77)
at
org.apache.jmeter.threads.JMeterThread.interrupt(JMeterThread.java:580)
at
org.apache.jmeter.engine.StandardJMeterEngine.tellThreadsToStop(StandardJMeterEngine.java:552)
at
org.apache.jmeter.engine.StandardJMeterEngine.access$2(StandardJMeterEngine.java:547)
at
org.apache.jmeter.engine.StandardJMeterEngine$StopTest.run(StandardJMeterEngine.java:284)
at java.lang.Thread.run(Thread.java:662)
"Thread Group 1-1":
at
org.apache.http.impl.conn.AbstractPooledConnAdapter.detach(AbstractPooledConnAdapter.java:106)
- waiting to lock <0x19e00148> (a
org.apache.http.impl.conn.SingleClientConnManager$ConnAdapter)
at
org.apache.http.impl.conn.SingleClientConnManager.shutdown(SingleClientConnManager.java:342)
- locked <0x19e00118> (a
org.apache.http.impl.conn.SingleClientConnManager)
at
org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.closeThreadLocalConnections(HTTPHC4Impl.java:1076)
at
org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.threadFinished(HTTPHC4Impl.java:1065)
at
org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.threadFinished(HTTPSamplerProxy.java:71)
at
org.apache.jmeter.threads.JMeterThread$ThreadListenerTraverser.addNode(JMeterThread.java:553)
at
org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:986)
at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:969)
at
org.apache.jmeter.threads.JMeterThread.threadFinished(JMeterThread.java:528)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:308)
at java.lang.Thread.run(Thread.java:662)
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