Here is the entry from my nightly analysis report:

New nsk.jdb failures (from 2008.02.16)
    nsk/jdb/unwatch/unwatch002
        This test failed due to "Exception in thread "event-handler"
        java.lang.NullPointerException" on Linux IA32 Client VM
        (machine circuslv). This error message was found in the
        jdb.stderr file. The test's .log file makes this failure look
        like a timeout.

Here is a link to the test's run directory:

http://sqeweb.sfbay/nfs/results/vm/gtee/JDK7/NIGHTLY/VM/2008-02-16/Serv_Baseline/vm/linux-i586/client/comp/vm-linux-i586_client_comp_nsk.jdb.testlist2008-02-16-22-30-52/ResultDir/unwatch002/

Here is the contents of the jdb.stderr file:

Exception in thread "event-handler" java.lang.NullPointerException
	at com.sun.tools.example.debug.tty.TTY.printCurrentLocation(TTY.java:203)
	at com.sun.tools.example.debug.tty.TTY.vmInterrupted(TTY.java:180)
	at com.sun.tools.example.debug.tty.EventHandler.run(EventHandler.java:77)
	at java.lang.Thread.run(Thread.java:674)