--- linux-2.6.9/arch/i386/kernel/traps-xen.c.orig	2008-12-04 15:25:11.932073000 -0800
+++ linux-2.6.9/arch/i386/kernel/traps-xen.c	2008-12-04 15:30:14.075827000 -0800
@@ -551,7 +551,8 @@ check_lazy_exec_limit(int cpu, struct pt
 	desc1 = &current->mm->context.user_cs;
 	desc2 = &get_cpu_gdt_table(cpu)[GDT_ENTRY_DEFAULT_USER_CS];
 
-	if (desc1->a != desc2->a || desc1->b != desc2->b) {
+	if ((desc1->a & 0xff0000ff) != (desc2->a & 0xff0000ff) || 
+			desc1->b != desc2->b) {
 		/*
 		 * The CS was not in sync - reload it and retry the
 		 * instruction. If the instruction still faults then