This patch corrects the following: - Fixes a problem with the ikdebug debugger that causes a system to panic with the following message: panic: simple_lock: time limit exceeded - Fixes a problem in which an AlphaStation 600, as well as other systems, may crash when user mode debuggers are in use (for example, dbx or ladebug). - Reduces the kdebug memory usage. - Fixes user mode breakpoints/single stepping. - Fixes kdebug MP problems.