Export the show_task() function in order to get better process stacks.
It will also print the current process stack, which is useful.

This is a nice-to-have but not required for Lustre to work.

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c	2006-07-15 11:51:46.000000000 +0800
+++ linux-2.6/kernel/sched.c	2006-07-15 16:24:35.000000000 +0800
@@ -4698,6 +4698,7 @@ static void show_task(struct task_struct
 
 		show_stack(p, NULL);
 }
+EXPORT_SYMBOL(sched_show_task);
 
 void show_state(void)
 {