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    SubjectRe: 2.6.13-rc6 Oops with Software RAID, LVM, JFS, NFS
    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@cse.unsw.edu.au> 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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