On Fri, May 29, 2009 at 12:04:32PM +0200, Martin Willi wrote:
>
> After doing further tests, it seems that this is additionally related to
> User-Mode-Linux and/or it's TUN/TAP network driver. I couldn't reproduce
> the issue on a x64 with e1000.
> I think the bug is actually in the UML network code, but changing the
> scatterwalk logic by using the hash_walk functions triggered the issue.
Ah, I think I see the problem. You must getting an sg entry that
crosses a page boundary, rather than two sg entries that both stay
within a page. These things are very rare, and usually occurs as
a result of SLAB debugging causing kmalloc to return memory that
crosses page boundaries.
Can you see if this patch fixes the problem?
diff --git a/crypto/ahash.c b/crypto/ahash.c
index b2d1ee3..f347637 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -82,10 +82,11 @@ int crypto_hash_walk_done(struct crypto_hash_walk *walk,
int err)
if (err)
return err;
- walk->offset = 0;
-
- if (nbytes)
+ if (nbytes) {
+ walk->offset = 0;
+ walk->pg++;
return hash_walk_next(walk);
+ }
if (!walk->total)
return 0;
Thanks,
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