linux-kernel - Re: [2.6.27.6] jfs on raid1 => attempt to access beyond end of device.

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Date:	Thu, 20 Nov 2008 21:36:43 +1100 (EST)
From:	"NeilBrown" <neilb@...e.de>
To:	Pawe³ Sikora <pluto@...k.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.27.6] jfs on raid1 => attempt to access beyond end of 
     device.

On Thu, November 20, 2008 8:03 pm, Pawe³ Sikora wrote:
> hi,
>
> few hours ago i've set up jfs filesystems on raid1 and raid0.
> during restoring backup i've got an errors in dmesg.
> the testcase on my system is easy and 100% reproducible:
> just do the following command on jfs/raid1 device:
....

> /dev/sda2   *         748        2206    11719417+  fd  Linux raid
                                           ^^^^^^^^^
size of sda2 is Kilobytes - 23438835 sectors.


>
> md0 : active raid1 sda2[0] sdb2[1]
>       11719296 blocks [2/2] [UU]
        ^^^^^^^^

size of md0 in kilobytes - 23438592 sectors.


> [ 5583.796222] attempt to access beyond end of device
> [ 5583.796227] md0: rw=1, want=23438832, limit=23438592
Largest 'want' value.

'want' is just less than size of sda2
'limit' is exactly size of md0 (no surprise there).

> any ideas what's wrong?

I suspect you created the filesystem on /dev/sda2, not realising
that when you created a raid1 from sda2 and sdb2 it would be slightly
smaller than sda2 (as md used up to 120K for metadata storage).

NeilBrown

(P.S. I love it when people provide all the details thus making it
 easier for me to spot what is happening - thanks!)

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