Information about the deadlock issue.
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We are looking for help with diagnosing the root cause for an issue we saw with
one of our web servers last night.

We are running Jetty (vai compojure / ring) and encountered deadlock that
points to Keyword.intern.

We are running on an AWS EC2 m1.large instance.  We recently moved from
physical machines at a different hosting provider to AWS.  We did not encounter
this issue on the physical servers, which we were running on for about 1.5
years.  We were running on offical Sun / Oracle JDK at that provider and have
since moved to the OpenJDK since the license change that prevented the offical
JDK from being distributed with Ubuntu.

The environment information is:

  $ uname -a
  Linux app-01 2.6.32-344-ec2 #46-Ubuntu SMP Wed Mar 7 13:47:05 UTC 2012 x86_64 GNU/Linux
  $ java -version
  java version "1.6.0_20"
  OpenJDK Runtime Environment (IcedTea6 1.9.13) (6b20-1.9.13-0ubuntu1~10.04.1)
  OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)
  $ javac -version
  javac 1.6.0_20
The project's Clojure and library dependencies are:
                   [clj-json/clj-json                           "0.3.1"]
                   [commons-codec/commons-codec                 "1.6"]
                   [commons-io/commons-io                       "2.0"]
                   [compojure/compojure                         "1.0.0-RC1"]
                   [hiccup/hiccup                               "0.2.6"]
                   [javax.mail/mail                             "1.4"]
                   [jline/jline                                 "0.9.94"]
                   [joda-time/joda-time                         "1.6.2"]
                   [org.clojure/clojure                         "1.2.0"]
                   [org.clojure/clojure-contrib                 "1.2.0"]
                   [org.clojure/data.csv                        "0.1.2"]
                   [org.codehaus.jackson/jackson-core-asl       "1.8.6"]
                   [org.mindrot/jbcrypt                         "0.3m"]
                   [postal                                      "1.2.0"]
                   [ring/ring-jetty-adapter                     "1.0.0"]
                   [sandbar/sandbar                             "0.3.3"]
                   [swank-clojure/swank-clojure                 "1.4.2"]
There is a thread dump file in the same directory as this file.