Re: 2.6.20.3: kernel BUG at mm/slab.c:597 try#2

[Pekka Enberg]

On 3/19/07, Pekka Enberg <penberg@xxxxxxxxxxxxxx> wrote:
> You can see that mempool_free is passing a NULL pointer to
> kmem_cache_free() which doesn't handle it properly. The NULL pointer
> comes from bio_free() where ->bi_io_vec is  NULL because nr_iovecs
> passed to bio_alloc_bioset() was zero.
>
> The question is, why is nr_pages zero in scsi_req_map_sg()?

Note that the following patch I posted only addresses the part where
slab is clearly failing here:

http://lkml.org/lkml/2007/3/19/42

So, while it should fix the oops, there might be a bug lurking in the
SCSI or block layer still.
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