Add a comment indicating that VOP_GETATTR() is called without appropriate

locking in the core dump code.  This should be fixed.

sys/kern/kern_sig.c

@@ -1932,6 +1932,8 @@ const char *name; uid_t uid; pid_t pid; {
  * then it passes on a vnode and a size limit to the process-specific
  * coredump routine if there is one; if there _is not_ one, it returns
  * ENOSYS; otherwise it returns the error from the process-specific routine.
+ *
+ * XXX: VOP_GETATTR() here requires holding the vnode lock.
  */
 
 static int