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The next steps are necessary on SnowLeopard, but are probably because of a bug in
how Keychain Access makes certificates.
(Note: These also apply for Lion.)

• Option-drag the new lldb_codesign certificate from the login keychain to
  the System keychain in the Keychains pane of the main Keychain Access window
  to make a copy of this certificate in the System keychain. You'll have to
  authorize a few more times, set it to be "Always trusted" when asked.
• Switch to the System keychain, and drag the copy of lldb_codesign you just
  made there onto the desktop.

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• Right click on the "lldb_codesign" certificate in the "System" keychain (NOT
  "login", but the one in "System"), and select "Delete" to delete it from
  the "System" keychain.
• Reboot (I've found this step unnecessary.)
• Clean and rebuild OpenJDK and you should be able to debug. (You can just remove the jsadebug,jinfo,jmap binaries in build/macosx-universal/bin instead of cleaning everything.)