kernel/linux-2.6-debug-taint-vm.patch

From 77c78bac236c7b07d390be65f357c85a79cce890 Mon Sep 17 00:00:00 2001
From: Dave Jones <davej@redhat.com>
Date: Wed, 26 Oct 2011 18:44:26 -0400
Subject: [PATCH] Add more debugging information to the VM subsystem

Dump modules in bad_page, and print taint information in other areas
---
 mm/page_alloc.c |    1 +
 mm/slab.c       |    8 ++++----
 mm/slub.c       |    2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6e8ecb6..83a0205 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -318,6 +318,7 @@ static void bad_page(struct page *page)
 		current->comm, page_to_pfn(page));
 	dump_page(page);
 
+	print_modules();
 	dump_stack();
 out:
 	/* Leave bad fields for debug, except PageBuddy could make trouble */
diff --git a/mm/slab.c b/mm/slab.c
index 708efe8..114a66d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1927,8 +1927,8 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
 			/* Print header */
 			if (lines == 0) {
 				printk(KERN_ERR
-					"Slab corruption: %s start=%p, len=%d\n",
-					cachep->name, realobj, size);
+					"Slab corruption (%s): %s start=%p, len=%d\n",
+					print_tainted(), cachep->name, realobj, size);
 				print_objinfo(cachep, objp, 0);
 			}
 			/* Hexdump the affected line */
@@ -3037,8 +3037,8 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp)
 	if (entries != cachep->num - slabp->inuse) {
 bad:
 		printk(KERN_ERR "slab: Internal list corruption detected in "
-				"cache '%s'(%d), slabp %p(%d). Hexdump:\n",
-			cachep->name, cachep->num, slabp, slabp->inuse);
+				"cache '%s'(%d), slabp %p(%d). Tainted(%s) Hexdump:\n",
+			cachep->name, cachep->num, slabp, slabp->inuse, print_tainted());
 		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp,
 			sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t),
 			1);
diff --git a/mm/slub.c b/mm/slub.c
index 95215aa..bbec29e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -570,7 +570,7 @@ static void slab_bug(struct kmem_cache *s, char *fmt, ...)
 	va_end(args);
 	printk(KERN_ERR "========================================"
 			"=====================================\n");
-	printk(KERN_ERR "BUG %s: %s\n", s->name, buf);
+	printk(KERN_ERR "BUG %s (%s): %s\n", s->name, print_tainted(), buf);
 	printk(KERN_ERR "----------------------------------------"
 			"-------------------------------------\n\n");
 }
-- 
1.7.6.4