https://issues.apache.org/bugzilla/show_bug.cgi?id=50467
Summary: Occasional NIO connector lockups on high load
Product: Tomcat 6
Version: 6.0.29
Platform: Other
OS/Version: Linux
Status: NEW
Severity: major
Priority: P2
Component: Connectors
AssignedTo: [email protected]
ReportedBy: [email protected]
We've been running Tomcat 6.0.29 on FC8 2.6.21 with tens of thousands of long
polling threads which usually work fine. Every few days though we will
experience a sudden lockup of the NIO connector and it has to be restarted.
These have been seen to be accompanied by the following stack trace:
Exception in thread "http-8082-ClientPoller-0" java.lang.NullPointerException
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:1620)
at java.lang.Thread.run(Thread.java:662)
Looking at the source it seems the issue is likely to be a race condition where
access() is called on a null attachment, probably while it's in the process of
being cancelled:
while (iterator != null && iterator.hasNext()) {
SelectionKey sk = (SelectionKey) iterator.next();
KeyAttachment attachment =
(KeyAttachment)sk.attachment();
/*NPE*/ attachment.access();
iterator.remove();
processKey(sk, attachment);
}//while
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