Re: 2.6.16: Oops - null ptr in blk_recount_segments?

[Jens Axboe]

On Wed, Mar 29 2006, Peter Palfrader wrote:
> On Wed, 29 Mar 2006, Nathan Scott wrote:
> 
> > You'll be better off trying the bio_clone fix discussed in the
> > other (ext3-bio_clone-panic) thread than go down this route
> > (there is a fix in 2.6.16.1 apparently - start there).  Certainly
> > try that before attempting to revert these changes anyway.
> 
> The problem persists on 2.6.16.1.

The original oops showed the path into bio_clone() originating from
crypt_alloc_buffer() in dm-crypt.c - and blk_recount_segments() is
oopsinig in page_to_pfn(), meaning that the most likely cause of this is
dm-crypt passing in a bio with invalid ->bi_idx and/or ->bi_vcnt. At
least they are not matching what ->bi_io_vec[] holds.

-- 
Jens Axboe

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