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I have the same problem. It triggers soft lockups in the kernel of the jenkins host:
901 Jan 30 02:31:58 build kernel: [589969.228931] INFO: rcu_sched detected stall on CPU 3 (t=57719 jiffies)
902 Jan 30 02:31:58 build kernel: [589969.228939] INFO: rcu_sched detected stall on CPU 2 (t=57719 jiffies)
903 Jan 30 02:31:58 build kernel: [589969.228929] INFO: rcu_sched detected stall on CPU 1 (t=57719 jiffies)
904 Jan 30 02:31:58 build kernel: [589969.228944] INFO: rcu_sched detected stall on CPU 4 (t=57719 jiffies)
905 Jan 30 02:31:58 build kernel: [589969.228939] sending NMI to all CPUs:
Note the timestamp correlation between the exception below and the stalls above.
712 Jan 30, 2013 2:31:58 AM org.kohsuke.stapler.compression.CompressionFilter reportException
6713 WARNING: Untrapped servlet exception
6714 winstone.ClientSocketException: Failed to write to client
6715 at winstone.ClientOutputStream.write(ClientOutputStream.java:41)
6716 at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
6717 at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
6718 at winstone.WinstoneOutputStream.commit(WinstoneOutputStream.java:165)
6719 at winstone.WinstoneOutputStream.flush(WinstoneOutputStream.java:217)
6720 at winstone.WinstoneOutputStream.close(WinstoneOutputStream.java:227)
6721 at java.util.zip.DeflaterOutputStream.close(DeflaterOutputStream.java:241)
6722 at org.kohsuke.stapler.compression.FilterServletOutputStream.close(FilterServletOutputStream.java:36)
6723 at net.bull.javamelody.FilterServletOutputStream.close(FilterServletOutputStream.java:46)
This happens most nights at the same time.