> Summary of what I've managed to rule out so far:
>1. this problem does not occur without dm-crypt

Please could you test attached patch ?
Sorry for another annoying reboot :-)

Milan
--
[EMAIL PROTECTED]



From: Milan Broz <[EMAIL PROTECTED]>

Disable barriers in dm-crypt because of current workqueue processing
can reorder requests.

This must be addresed later but for now disabling barriers is needed
to prevent data corruption.

Signed-off-by: Milan Broz <[EMAIL PROTECTED]>

Index: linux-2.6.20.1/drivers/md/dm-crypt.c
===================================================================
--- linux-2.6.20.1.orig/drivers/md/dm-crypt.c   2007-03-23 15:07:11.000000000 
+0100
+++ linux-2.6.20.1/drivers/md/dm-crypt.c        2007-03-23 15:09:59.000000000 
+0100
@@ -925,6 +925,9 @@ static int crypt_map(struct dm_target *t
        struct crypt_config *cc = ti->private;
        struct crypt_io *io;
 
+       if (bio_barrier(bio))
+               return -EOPNOTSUPP;
+
        io = mempool_alloc(cc->io_pool, GFP_NOIO);
        io->target = ti;
        io->base_bio = bio;


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