Re: 2.6.13-rc6 Oops with Software RAID, LVM, JFS, NFS

[Sonny Rao]

On Fri, Aug 12, 2005 at 12:35:05PM -0500, Phil Dier wrote:
> On Fri, 12 Aug 2005 12:07:21 +1000
> Neil Brown <neilb@xxxxxxxxxxxxxxx> wrote:
> > You could possibly put something like
> > 
> > 	struct bio_vec *from;
> > 	int i;
> > 	bio_for_each_segment(from, bio, i)
> > 		BUG_ON(page_zone(from->bv_page)==NULL);
> > 
> > in generic_make_requst in drivers/block/ll_rw_blk.c, just before
> > the call to q->make_request_fn.
> > This might trigger the bug early enough to see what is happening.
> 
> 
> I've got tests running with this code in place, by I/O is so slow now
> I don't think it's going to oops (or if it does, it'll be a while)..
> 
> Is there any other info I can collect to help track this down?

Well, while we are slowing things down in the name of debugging..
you might try setting the following debug options in your config:

CONFIG_DEBUG_PAGEALLOC
CONFIG_DEBUG_HIGHMEM
CONFIG_DEBUG_SLAB
CONFIG_FRAME_POINTER 

Can anyone think of anything else?

According to the website you don't have these on right now.

Sonny
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