Re: 2.6.25-git2: BUG: unable to handle kernel paging request atffffffffffffffff

[Pekka J Enberg]

On Wed, 23 Apr 2008, Christoph Lameter wrote:
> We should have returned from the function and not printed this message. If 
> we somehow skipped the test for !fault then end could have wrapped around 
> which gets us to 4GB.

Aah, looks like it's just a silly bug in slab_fix(). If this looks ok to 
Christoph, can you re-test with this patch applied Zdenek? That way we'll 
actually know where SLUB expected to see POISON_INUSE.

Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---

diff --git a/mm/slub.c b/mm/slub.c
index 7f8aaa2..dac50e3 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -456,6 +456,15 @@ static void print_page_info(struct page *page)
 
 }
 
+static void __slab_bug(struct kmem_cache *s, char *buf)
+{
+	printk(KERN_ERR "========================================"
+			"=====================================\n");
+	printk(KERN_ERR "BUG %s: %s\n", s->name, buf);
+	printk(KERN_ERR "----------------------------------------"
+			"-------------------------------------\n\n");
+}
+
 static void slab_bug(struct kmem_cache *s, char *fmt, ...)
 {
 	va_list args;
@@ -464,11 +473,7 @@ static void slab_bug(struct kmem_cache *s, char *fmt, ...)
 	va_start(args, fmt);
 	vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
-	printk(KERN_ERR "========================================"
-			"=====================================\n");
-	printk(KERN_ERR "BUG %s: %s\n", s->name, buf);
-	printk(KERN_ERR "----------------------------------------"
-			"-------------------------------------\n\n");
+	__slab_bug(s, buf);
 }
 
 static void slab_fix(struct kmem_cache *s, char *fmt, ...)
@@ -533,7 +538,7 @@ static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...)
 	va_start(args, fmt);
 	vsnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);
-	slab_bug(s, fmt);
+	__slab_bug(s, buf);
 	print_page_info(page);
 	dump_stack();
 }
--
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