--- linux.old/mm/page_alloc.c	Sun Feb 18 20:06:11 2001
+++ linux/mm/page_alloc.c	Sun Feb 18 20:05:59 2001
@@ -70,8 +70,15 @@
 
 	if (page->buffers)
 		BUG();
-	if (page->mapping)
+	if (page->mapping) {
+	    	printk(KERN_EMERG "found bad mapping %lxh.\n",
+			(unsigned long)page->mapping);
+		printk(KERN_EMERG "page->mapping->nrpages: %d.\n",
+				(int)page->mapping->nrpages);
+		printk(KERN_EMERG "page->mapping->a_ops: [<%lxh>]\n",
+				(unsigned long)page->mapping->a_ops);
 		BUG();
+	}
 	if (!VALID_PAGE(page))
 		BUG();
 	if (PageSwapCache(page))