linux-kernel - Re: BUG at drivers/scsi/scsi

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Date:	Thu, 22 Jul 2010 17:37:16 +1000
From:	Neil Brown <neilb@...e.de>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	linux-scsi@...r.kernel.org, hch@....de, jaxboe@...ionio.com,
	LKML <linux-kernel@...r.kernel.org>, linux-raid@...r.kernel.org
Subject: Re: BUG at drivers/scsi/scsi_lib.c:1113

On Thu, 22 Jul 2010 09:04:27 +0200
Jiri Slaby <jirislaby@...il.com> wrote:

> Hello,
> 
> I'm seeing this BUG while booting:
> 
> EXT3-fs (md1): using internal journal
> ------------[ cut here ]------------
> kernel BUG at /home/l/latest/xxx/drivers/scsi/scsi_lib.c:1113!

You aren't the only one.
https://bugzilla.kernel.org/show_bug.cgi?id=16275


> I bisected it down to:
> commit 74450be123b6f3cb480c358a056be398cce6aa6e
> Author: Christoph Hellwig <hch@....de>
> Date:   Fri Jun 18 11:53:43 2010 +0200
> 
>     block: unify flags for struct bio and struct request
> 
>     Remove the current bio flags and reuse the request flags for the
> bio, too.
>     This allows to more easily trace the type of I/O from the filesystem
>     down to the block driver.  There were two flags in the bio that were
>     missing in the requests:  BIO_RW_UNPLUG and BIO_RW_AHEAD.  Also I've
>     renamed two request flags that had a superflous RW in them.
> 
>     Note that the flags are in bio.h despite having the REQ_ name - as
>     blkdev.h includes bio.h that is the only way to go for now.
> 
>     Signed-off-by: Christoph Hellwig <hch@....de>
>     Signed-off-by: Jens Axboe <jaxboe@...ionio.com>
> 
>

Thanks for doing that.

I suspect that problem is that "do_sync" and "do_barriers" in
drivers/md/raid1.c are still 'bool' and should now be 'unsigned long'.

I'm not sure how wide '_Bool' is, but I'm guess it isn't wide enough.

Could you please try changing ever 'bool' in that file to 'unsigned long'
and see if that fixes it?

Thanks,
NeilBrown
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