File system errors - Ext4 ?

[Tommy Hjalmarsson]

Robin Darlington wrote:
> Hi everyone,
> I am running a fresh install of Ubuntu Studio Karmic and I have now 
> experienced filesystem errors twice.
> The first time I put my computer to sleep and upon waking up it would 
> not accept my password (not due to keyboard layout : i checked by 
> typing it in username field) so I restarted and then  I had to run 
> fsck manually to fix the Filesystem errors. The seccond time I was 
> trying to install some software in the terminal via sudo apt-get and 
> the sudo was just getting ignored. So i restarted and once again had 
> to run fsck in order for my system to boot. I installed with a ext4 
> filesystem.
>
> Does anyone have any ideas what is going on here? and how to fix it?
> Has this happened to anybody else? Could it be to do with the fact 
> that I am using to tweak ubuntu <http://ubuntu-tweak.com/>  to install 
> third party software (Opera, VirtualBox, Code Blocks etc.) ?
>
> Thank you for your time,
> Robin
Here is a bugg comment:
/Comment #6 <http://bugzilla.kernel.org/show_bug.cgi?id=14354#c6> From 
Alexey Fisher <mailto:bug-track at fisher-privat.net> 2009-10-10 16:48:58/ 
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Ok, i think i know now how it's happed. I nneded some time to play to reproduce
it. There is _no_difference_ if you just boot 2.6.32 kernel run fsck and then
boot 2.6.31 kernel and run fsck again - nothing will happen.

here is the way i reproduced it:
1. crash (reset or poweroff) 2.6.32-rc3 kernel,
2. start again in 2.6.32-rc3
3. run fsck it well looks clean.. but some progrums will lost it setting.

4. reboot and start with 2.6.31 kernel
5. run fsck and this will find that ext4 is brocken.
6. after fsck fix it.. many fils will be lost.