xfsdump SGI_FS_BULKSTAT errno = 22, how could this IRIX bug get into Ubuntu 10.04 Lucid between kernels 2.6.32-27 and 2.6.32-26?

[Bill Kendall]

On 02/04/2011 02:49 PM, Dave Chinner wrote:
> On Fri, Feb 04, 2011 at 09:12:53AM -0500, Michael Lueck wrote:
>> Dave Chinner wrote:
>>> Ok, so xfsdump i seeing a short bulkstat, then an EINVAL returned
>> >from the next bulkstat. That's not a race condition, and makes me
>>> think you have some kind of on-disk corruption.
>>
>> Very odd that some kind of on-disk corruption is suddenly causing
>> xfsdump problems starting with Ubuntu 10.04 (Lucid) kernel
>> 2.6.32-27 and persisting in 2.6.32-28.
>
> Not really. The newer kernels have code in them that does more
> validity checks than previous kernels, so older kernels would have
> erroneously and silently returned unlinked files to xfsdump and have
> them backed up. IOWs, you'd never notice such a corruption with
> xfsdump. On the new kernel, xfsdump gets an EINVAL error to such
> occurrences, which it should have in the first place.
>
>> And there is one other person who confirmed this xfsdump problem
>> running Lucid with kernel 2.6.32-28. They reported their "me too"
>> in the Ubuntu bug tracker.
>>
>> Could it be that 2.6.32-26 and prior managed to write something to
>> disk corrupted, and the newer code is tripping on it?
>
> That's what I'm trying to find out. Or it could be something as
> simple as your disk has had an undetected bit error that has flipped
> a bit in the inode allocation btree.
>

Hi Dave,

I am able to reproduce this on a system running Ubuntu 10.4
(2.6.32-28). I took a metadump of the filesystem and moved it to
a system running 10.10 (2.6.35-25), and was able to successfully
dump it there. Likewise it dumps fine on 2.6.38-rc1. So this
suggests an issue with the Ubuntu 10.4 kernel.

Bill