Re: Repeatable, raid1+O_DIRECT, hang/warn

["Dr. David Alan Gilbert" <linux@treblig.org>]

* Keith Busch (kbusch@kernel.org) wrote:
> On Mon, Jun 15, 2026 at 04:37:39PM +0000, Dr. David Alan Gilbert wrote:
> > Hi Keith,
> >   Thanks for the patch, alas it doesn't seem to be helping here;
> >  the first warn is still the same
> > and it still hangs the test process hard and eventually BUGs at
> > 
> > void blk_mq_end_request(struct request *rq, blk_status_t error)
> > {
> >         if (blk_update_request(rq, error, blk_rq_bytes(rq)))
> >                 BUG();
> 
> Oh, that was not expected.
> 
> What is the dma alignment requirement of your backing devices? You can
> find the attribute for sda at /sys/block/sda/queue/dma_alignment. I'm
> expecting 511, but just want to double check.

Yeh looks like it:
/sys/block/sda/queue/dma_alignment:511
/sys/block/sdb/queue/dma_alignment:511

all of the lvm also looks like it is.

Dave

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