--- kernel/futex.c.old	2008-11-21 16:07:17.000000000 +0300
+++ kernel/futex.c.new	2008-11-21 16:07:43.000000000 +0300
@@ -481,7 +481,7 @@ lookup_pi_state(u32 uval, struct futex_h
 
 			WARN_ON(!atomic_read(&pi_state->refcount));
 			WARN_ON(pid && pi_state->owner &&
-				pi_state->owner->pid != pid);
+				virt_pid(pi_state->owner) != pid);
 
 			atomic_inc(&pi_state->refcount);
 			me->pi_state = pi_state;