FULL PRODUCT VERSION :
robo@troll:~/src/java/RabbIT3$ ~/pkg/java/jdk1.6.0/bin/java -version
java version "1.6.0-rc"
Java(TM) SE Runtime Environment (build 1.6.0-rc-b100)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0-rc-b100, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux troll 2.6.15-23-amd64-generic #1 SMP PREEMPT Tue May 23 13:45:47 UTC 2006 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
Trying to run ab2 to benchmark the rabbit proxy, http://www.khelekore.org/rabbit/

Download the proxy, and start it, then run:
ab2 -n10000 -c50 -X localhost:9666 http://www.khelekore.org/~robo/arcs.png

With java/5 (1.5.0._08) everything works without problems.

With java/6 I get frequent but random:
java.io.IOException: Operation not permitted
        at sun.nio.ch.EPollArrayWrapper.epollCtl(Native Method)
        at sun.nio.ch.EPollArrayWrapper.updateRegistrations(EPollArrayWrapper.java:202)
        at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:183)
        at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
        at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
        at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
        at rabbit.proxy.HttpProxy.run(HttpProxy.java:394)
        at java.lang.Thread.run(Thread.java:619)


And ab2 say something like
Benchmarking www.khelekore.org [through localhost:9666] (be patient)
apr_recv: (104)
  Total of 399 requests completed


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Download the proxy from http://www.khelekore.org/rabbit/ and start it, then run:
ab2 -n10000 -c50 -X localhost:9666 http://www.khelekore.org/~robo/arcs.png



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No errors.
ACTUAL -
proxy crashes and fails to respond.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
ava.io.IOException: Operation not permitted
        at sun.nio.ch.EPollArrayWrapper.epollCtl(Native Method)
        at sun.nio.ch.EPollArrayWrapper.updateRegistrations(EPollArrayWrapper.java:202)
        at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:183)
        at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
        at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
        at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
        at rabbit.proxy.HttpProxy.run(HttpProxy.java:394)
        at java.lang.Thread.run(Thread.java:619)


REPRODUCIBILITY :
This bug can be reproduced often.

CUSTOMER SUBMITTED WORKAROUND :
stay with java/5