---
 mm/memory.c |    7 +++++++
 mm/rmap.c   |   37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

Index: linux-2.6/mm/memory.c
===================================================================
--- linux-2.6.orig/mm/memory.c	2007-09-10 19:54:26.000000000 -0700
+++ linux-2.6/mm/memory.c	2007-09-10 19:55:39.000000000 -0700
@@ -2377,6 +2377,10 @@ static int __do_fault(struct mm_struct *
 			return VM_FAULT_OOM;
 	}
 
+	if (PageHead(vmf.page)) {
+		printk("__do_fault: page=%p order=%d page_index=%d pgoff=%d address=%lu\n",
+			vmf.page,  page_cache_page_order(vmf.page), vmf.page_index, pgoff, address);
+	}
 	/*
 	 * For consistency in subsequent calls, make the faulted page always
 	 * locked.
@@ -2475,6 +2479,9 @@ static int __do_fault(struct mm_struct *
 		update_mmu_cache(vma, address, entry);
 		lazy_mmu_prot_update(entry);
 	} else {
+		if (PageHead(vmf.page)) {
+			printk("__do_fault: race\n");
+		}
 		if (anon)
 			page_cache_release(page);
 		else