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Eclipse 3.6 on Ubuntu 10.4 (64bit):

"Text Viewer Hover Presenter" daemon prio=10 tid=0x00007f4e3640d800 nid=0x4108 runnable [0x00007f4e12cd9000]
   java.lang.Thread.State: RUNNABLE
	at org.eclipse.core.internal.filebuffers.SynchronizableDocument.getLockObject(SynchronizableDocument.java:49)
	- locked <0x00007f4e7f54f050> (a org.eclipse.core.internal.filebuffers.SynchronizableDocument)
	at org.eclipse.core.internal.filebuffers.SynchronizableDocument.getChar(SynchronizableDocument.java:148)
	at jp.gr.java_conf.ussiy.app.propedit.eclipse.plugin.jdt.hover.PropertiesHover.getHoverInfo(PropertiesHover.java:100)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:147)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:82)
	at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:166)

Seems to be an infinite loop in PropertiesHover.java, since this thread is always in this method whenever I dump the stack of Eclipse. Keeps 1 CPU core completely busy by the way.