[dm-devel] linux-next oops

[Mikulas Patocka]

On Tue, 9 Oct 2012, Bill Pemberton wrote:

> > I pulled linux-next, set up multipath and executed fsync() on it, and 
> > there was no crash for me.
> > 
> 
> Ok, I've got two machines that won't boot with it.... it doesn't get
> far enough to run anything.
> 
> -- 
> Bill

Try this. In my original patch that I sent, I removed bio_alloc_bioset and 
left __bio_clone. But meanwhile, Kent Overstreet sent another patch that 
replaces both bio_alloc_bioset and __bio_clone with bio_clone_bioset. The 
reason for this crash is incorrect resolution of this conflict - 
bio_clone_bioset was removed (although my patch removed only 
bio_alloc_bioset) and __bio_clone was not added back.

Mikulas

---
 drivers/md/dm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-next-copy/drivers/md/dm.c
===================================================================
--- linux-next-copy.orig/drivers/md/dm.c	2012-10-11 02:55:34.000000000 +0200
+++ linux-next-copy/drivers/md/dm.c	2012-10-11 02:55:58.000000000 +0200
@@ -1160,7 +1160,7 @@ static void __issue_target_request(struc
 	 * ci->bio->bi_max_vecs is BIO_INLINE_VECS anyway, for both flush
 	 * and discard, so no need for concern about wasted bvec allocations.
 	 */
-
+	__bio_clone(clone, ci->bio);
 	if (len) {
 		clone->bi_sector = ci->sector;
 		clone->bi_size = to_bytes(len);