fedora 16, ext4 corruption

Michael D. Setzer II mikes at kuentos.guam.net
Mon Mar 4 14:05:54 UTC 2013

On 4 Mar 2013 at 13:21, Ian Malone wrote:

Date sent:      	Mon, 4 Mar 2013 13:21:03 +0000
Subject:        	Re: fedora 16, ext4 corruption
From:           	Ian Malone <ibmalone at gmail.com>
To:             	Community support for Fedora users 
<users at lists.fedoraproject.org>

> On 22 January 2013 11:08, Ian Malone <ibmalone at gmail.com> wrote:
> > Hi,
> >
> > Is anyone else seeing problems with F16 ext4? I recently moved my
> > install onto a new harddisc (which is reporting SMART is fine after
> > running a full test) and did that by making a new ext4 fs
> > (previously ext3) then rsyncing across. I'm now seeing occasional
> > system 'freezes' (not hard freezes, but programs can fail to start
> > or freeze. Yesterday the desktop completely stopped, but I was able
> > to switch to a virtual console). dmesg reports errors to do with
> > failing to write the journal and remounting read-only. On reboot an
> > fsck is required, which finds some fixable problems. Obviously I'm
> > wondering if it's the OS or the new disc. Was planning an F18
> > install soon which might help with one problem but not the other.
> > Don't know if it's the 'ext4 data corruption bug' or if that's been
> > fixed. http://www.phoronix.com/scan.php?page=news_item&px=MTIxNDQ
> >
> After a clean install of F18 I'm still having problems, though the
> symptoms are different. dmesg shows "READ FPDMA QUEUED" and "skipping
> hard reset" type errors. When this happens the entire desktop pauses
> for a while then recovers. The exact behaviour seems to have changed
> through the course of a number of kernel updates (most notably the
> system seems to recover stably after it happens now). It's either a
> hardware problem (though I've tried changing cables and the hard-disc
> mounting, port was working with the previous drive) or a kernel one
> (possibly buggy disc NCQ implementation needs workaround). Will file a
> bug, but thought I should follow up here.
> -- 

Don't know if it is a similar problem, but I had a Fedora 16 
machine that would find no smartctl error on a full scan, but was 
getting lots of smartctl error counts.  Replaced the disk and was 
still getting the errors. Took the old disk, and put it in another 
system no new problems. Took the new disk, and same no 
problems. Finally put a PCI sata controller in the machine, and 
hooked the disk to it, and no more errors. 

I am assuming it is a problem with the onboard controller, but not 
clear what or why there is not other error than the smartctl.

smartctl -a /dev/sda | grep "ATA Error Count"

The count got up to 2108, but since changing controller card has 
not reported any issues and number remains the same.

> imalone
> http://ibmalone.blogspot.co.uk
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  Michael D. Setzer II -  Computer Science Instructor      
  Guam Community College  Computer Center                  
  mailto:mikes at kuentos.guam.net                            
  mailto:msetzerii at gmail.com
  Guam - Where America's Day Begins                        
  G4L Disk Imaging Project maintainer 

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