ext4 fs going backwards in time

[PleegWat]

On 06/13/2010 11:38 AM, Jesper Fruergaard Andersen wrote:
> I have a desktop running ubuntu 9.10 with the root fs being ext4 on
> raid1. The desktop has an additional ext3 fs also on raid1.
>
> I tried to upgrade it to 10.04 using do-release-upgrade which seemed
> to work fine. But when I rebooted it failed complaining that /dev/shm
> was missing.
> I then rebooted on a 10.04 install cd and accessed then filesystems.
> The additional ext3 fs seems fine but the strange thing is the ext4
> root fs. fsck runs without any complaints. But the content seems to
> have stepped about 2 month back in time.
>
> /etc/lsb-release shows 9.10
> Content of /home have recent files missing and the newest timestamp is
> about 2 month old.
>
> How can a filesystem loose about 2 months of updates and return to
> what appears to be an old consistent state?
> Anything I can do to return to current time.
>

Have you checked the data? Is it just the timestamps that have gone back 
in time, or is actual newer data also missing.