On Sun, Dec 08, 2002 at 09:42:58PM +0100, Emmanuel Dreyfus wrote:

 > In fork1(), we set the child as runnable, and we use a pointer to its
 > proc structure after this. 
 > 
 > On a SMP system, the child could be scheduled for running on another
 > CPU, and it could even die before we get out of fork1(), thus making us
 > using a stale pointer on its struct proc.
 > 
 > It seems to me that we need to cleanup the end of fork1(), but I'm not
 > sure of what should be done.

You've just discovered one of the wonderful reasons why we must still run
with a Giant Kernel Lock.

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>