Re: 2.6.15-mm3 hangs during boot (raid related?)

On Thursday January 12, thunder7@xxxxxxxxx wrote:
>
> 2.6.15-mm3 hangs during boot for me, after the lines
>
> ========
> md4: bitmap initialized from disk: read 15/15 pages, set 51 bits, status: 0
> created bitmap (224 pages) for device md4
> ========
>
> ctrl-alt-del to reboot works sometimes (2 out of 3). Below is complete
> dmesg (from 2.6.15-mm2, ver_linux output, .config and raid details).

Yep, this is probably a known problem with recent changes to the
'barrier' code.

Try to convince md not to use barrier by changing md_super_write in
drivers/md/md.c. Simply remove

if (!test_bit(BarriersNotsupp, &rdev->flags)) {
struct bio *rbio;
rw |= (1<<BIO_RW_BARRIER);
rbio = bio_clone(bio, GFP_NOIO);
rbio->bi_private = bio;
rbio->bi_end_io = super_written_barrier;
submit_bio(rw, rbio);
} else

leaving the
submit_bio(rw, rbio);

which comes after it.

NeilBrown
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