Re: [BUG] raw over raid5: BUG at drivers/block/ll_rw_blk.c:1967

[Neil Brown]

On Monday October 14, [e-mail] wrote:
> 
> Hi everyone,
> 
> I haven't been able to run raw over raid5 since 2.5.30 or so, but every
> time I'm about to report it, a new kernel comes out and the problem
> changes completely :-( Now I'm finally going to start getting out the info
> it the hopes someone can fix it.  The oops was triggered by attempting to 
> read from /dev/raw/raw1 (bound to /dev/md0) using dd.  System info 
> follows oops:
> 
> ------------[ cut here ]------------
> kernel BUG at drivers/block/ll_rw_blk.c:1967!
> invalid operand: 0000
>  

You are not alone in reporting this BUG...

I blame the Scsi/bio  layer.
Jens Axboe blames raid5.
:-)

Hopefully we will find it one place or the other. 
The other report didn't use raw to get the bug, but if using raw makes
it reproducable, I will try that and see if I can reproduce it easily.

NeilBrown