How to fix bad superblock or xfs_repair: error - read only 0 of 512 bytes

[Christian Kildau]

Sorry, heres the right strace:

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All other output was correct!



On Jan 23, 2012, at 5:31 AM, Dave Chinner wrote:

> On Sat, Jan 21, 2012 at 11:29:15AM +0100, Christian Kildau wrote:
>> Sorry if this message appears twice!
>> 
>> 
>> 
>> Hello,
>> 
>> I'm having some very serious issues with XFS after upgrading from a
>> Linux Distro running Ubuntu 2.6.32 to 3.2.
>> 
>> It seems like my filesystems are damaged after attaching them to a
>> Linux 3.2 server. I am also no longer able to mount the hdd on the old
>> server that is still running 2.6.32!
> 
> I take it that you are using external storage of some kind? Can you
> describe it?
> 
>> (I created the xfs filesystem on the entire hdd, not on a partition,
>> so /dev/sdd is not a typo)
>> 
>> $ sudo mount -t xfs /dev/sdd /media/
>> mount: /dev/sdd: can't read superblock
>> (dmesg)
>> [236659.912663] attempt to access beyond end of device
>> [236659.912667] sdd: rw=32, want=2930277168, limit=2930275055
>> [236659.912670] XFS (sdd): last sector read failed
> 
> So XFS has asked to read 2113 sectors beyond the size of the device
> that the kernel is reporting. What is the output of
> /proc/partitions?
> 
>> $ sudo xfs_check /dev/sdd
>> xfs_check: error - read only 0 of 512 bytes
>> 
>> $ sudo xfs_repair /dev/sdd
>> Phase 1 - find and verify superblock...
>> xfs_repair: error - read only 0 of 512 bytes
> 
> So both buffered and direct IO to the first block in the block
> device are failing. I'd say your problems have nothing to do with
> XFS. However, can you strace them and find out what the error that
> is occuring actually is?
> 
> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david at fromorbit.com