Hudson opens too many files

hudson@deadlock:/hudson$ lsof | grep hudson | wc
72431 599541 7185484
hudson@deadlock:/hudson$ lsof | grep hudson | grep pipe| wc
47273 378184 4018205

and:
SEVERE: Failed to record SCM polling
java.io.FileNotFoundException: /hudson/workdir/jobs/trunk/scm-polling.log (Too
many open files)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at hudson.util.StreamTaskListener.<init>(StreamTaskListener.java:68)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:311)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:344)
at
hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:114)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

server is running at http://deadlock.netbeans.org/hudson/