XML-RPC server deadlocks under heavy load
-----------------------------------------
Key: XMLRPC-168
URL: https://issues.apache.org/jira/browse/XMLRPC-168
Project: XML-RPC
Issue Type: Bug
Components: Source
Affects Versions: 3.1.2
Environment: Soalris
Reporter: Alan Burlison
When running a XML-RPC server under heavu load, it eventually deadlocks inside
the thread pool that manages the 'worker' threads which handle the individual
XML-RPC requests - the classes involved are org.apache.xmlrpc.util.ThreadPool
and org.apache.xmlrpc.util.ThreadPool$Poolable. jstack on the hung process
shows:
----------
Found one Java-level deadlock:
=============================
"XML-RPC-13":
waiting to lock monitor 0x08d10bec (object 0xbb6959c0, a
org.apache.xmlrpc.util.ThreadPool),
which is held by "XML-RPC Weblistener"
"XML-RPC Weblistener":
waiting to lock monitor 0x08d1186c (object 0xbd2ed340, a
org.apache.xmlrpc.util.ThreadPool$Poolable$1),
which is held by "XML-RPC-2"
"XML-RPC-2":
waiting to lock monitor 0x08d112f4 (object 0xbd2ed570, a
org.apache.xmlrpc.util.ThreadPool$Poolable),
which is held by "XML-RPC Weblistener"
Java stack information for the threads listed above:
===================================================
"XML-RPC-13":
at org.apache.xmlrpc.util.ThreadPool.repool(Unknown Source)
- waiting to lock <0xbb6959c0> (a org.apache.xmlrpc.util.ThreadPool)
at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(Unknown Source)
"XML-RPC Weblistener":
at org.apache.xmlrpc.util.ThreadPool$Poolable.start(Unknown Source)
- waiting to lock <0xbd2ed340> (a
org.apache.xmlrpc.util.ThreadPool$Poolable$1)
- locked <0xbd2ed570> (a org.apache.xmlrpc.util.ThreadPool$Poolable)
at org.apache.xmlrpc.util.ThreadPool.startTask(Unknown Source)
- locked <0xbb6959c0> (a org.apache.xmlrpc.util.ThreadPool)
at org.apache.xmlrpc.webserver.WebServer.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)
"XML-RPC-2":
at org.apache.xmlrpc.util.ThreadPool$Poolable.isShuttingDown(Unknown
Source)
- waiting to lock <0xbd2ed570> (a
org.apache.xmlrpc.util.ThreadPool$Poolable)
at org.apache.xmlrpc.util.ThreadPool$Poolable.access$000(Unknown Source)
at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(Unknown Source)
- locked <0xbd2ed340> (a org.apache.xmlrpc.util.ThreadPool$Poolable$1)
Found 1 deadlock.
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