Index: linux-2.6.19-rc5-mm1/mm/swap_state.c
===================================================================
--- linux-2.6.19-rc5-mm1.orig/mm/swap_state.c	2006-11-10 21:50:32.399261686 -0600
+++ linux-2.6.19-rc5-mm1/mm/swap_state.c	2006-11-20 17:40:31.212641628 -0600
@@ -75,6 +75,9 @@ static int __add_to_swap_cache(struct pa
 {
 	int error;
 
+	printk(KERN_CRIT "__add_to_swap_cache(%p, %lx, %x)\n", page, entry, gfp_mask);
+	dump_stack();
+
 	BUG_ON(PageSwapCache(page));
 	BUG_ON(PagePrivate(page));
 	error = radix_tree_preload(gfp_mask);
@@ -101,6 +104,9 @@ int add_to_swap_cache(struct page *page,
 {
 	int error;
 
+	printk(KERN_CRIT "add_to_swap_cache(%p, %x)\n", page, entry);
+	dump_stack();
+
 	if (!swap_duplicate(entry)) {
 		remove_from_swapped_list(entry.val);
 		INC_CACHE_INFO(noent_race);
@@ -151,6 +157,9 @@ int add_to_swap(struct page * page, gfp_
 	swp_entry_t entry;
 	int err;
 
+	printk(KERN_CRIT "add_to_swap(%p, %x)\n", page, gfp_mask);
+	dump_stack();
+
 	/* Swap prefetching is delayed if we're swapping pages */
 	delay_swap_prefetch();