Re: 2.5.49: kernel BUG at drivers/block/ll_rw_blk.c:1950!

From: Jens Axboe (axboe@suse.de)
Date: Mon Dec 02 2002 - 03:24:16 EST


On Mon, Dec 02 2002, Neil Brown wrote:
> On Wednesday November 27, axboe@suse.de wrote:
> > On Wed, Nov 27 2002, Srihari Vijayaraghavan wrote:
> > > Hello Neil,
> > >
> > > On Wednesday 27 November 2002 07:13, Neil Brown wrote:
> > > > Srihari, could you possibly try with the following patch please to see
> > > > if it gives more useful information.
> > >
> > > No worries. That did the trick.
> > >
> > > The following message appears just before the first oops:
> > > Nov 27 18:56:32 localhost kernel: bio_add_page: want to add 4096 at 17658 but
> > > only allowed 3072 - prepare to oops...
> >
> > Neil, this is the problem. Currently a driver _must_ be able to accept a
> > page worth of data at any location...
>
> so raid0 (and linear) need to be able to split a bio .... I think
> we've been here before. Did you say you have plans for some generic
> helper code that could do this?

I'm afraid so... I'll come up with a splitter helper today/tomorrow.

-- 
Jens Axboe

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