For several weeks now there have been 4 or 5 memory leaks reported by run-webkit-tests, and around 20 node leaks. See <http://build.webkit.org/results/post-commit-leaks-powerpc-mac-os-x/2977/DumpRenderTree-leaks.txt> for stack traces on the memory leaks.
Using ObjectAlloc on a test case derived from editing/pasteboard/paste-as-text-012.html, I observed that sometimes NSHTMLReader leaks a DOMNode. This translates to a node leak. I believe this can make it harder to ignore the leak in run-webkit-tests if it's deemed external to WebKit.
Created attachment 11300 [details] ObjectAlloc output
Created attachment 11303 [details] Two CFDictionary (mutable-fixed) instances leaked by NSHTMLReader
radar 4826861
This bug is actually outside of WebKit. The Radar bug has been put in the AppKit team's hands. Closing this for now.
Believe it or not, it was a WebKit bug. Caused by the method name "hash" being used in the DOM bindings.
Committed revision 19486.