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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Dave Jones <davej@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Eric Sandeen <sandeen@redhat.com>
Subject: Re: Linux 2.6.39-rc3
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Date: Thu, 14 Apr 2011 13:50:16 +0530
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On Tue, 12 Apr 2011 15:21:03 -0400, Dave Jones <davej@redhat.com> wrote:
> On Tue, Apr 12, 2011 at 03:09:34PM -0400, Dave Jones wrote:
> 
>  > however, the output of mount looks very confused..
>  > 
>  > .38:
>  > /dev/mapper/vg_adamo-lv_home on /home type ext4 (rw,relatime,seclabel,barrier=1,data=ordered)
>  > 
>  > .39:
>  > - on /home type 79a9-4526-888c-1f86d35a6704 (rw,relatime,ext4)
>  > 
>  > It looks like /proc/self/mountinfo broke abi.
>  > 
>  > .38:
>  > 48 45 253:3 / /home rw,relatime - ext4 /dev/mapper/vg_adamo-lv_home rw,seclabel,barrier=1,data=ordered
>  > 
>  > .39:
>  > 46 22 253:3 / /home rw,relatime uuid:f3971858-79a9-4526-888c-1f86d35a6704 - ext4 /dev/mapper/vg_adamo-lv_home rw,seclabel,user_xattr,barrier=1,data=ordered
> 
> looks like this was caused by 93f1c20bc8cdb757be50566eff88d65c3b26881f
> 
> perhaps adding that string to the end of the line would preserve what mount expects ?

uuid:<value> is the option field  as per
Documentation/filesystem/proc.txt. There was an error in libmount
parsing which got fixed upstream recently 

you can find the details here 

http://thread.gmane.org/gmane.linux.kernel/1121533/focus=52474

-aneesh