XFS umount issue

[Nuno Subtil]

On Tue, May 24, 2011 at 06:33, Paul Anderson <pha at umich.edu> wrote:
> Hi Nuno - can you elaborate on the ARM hardware?  I noticed that my
> XFS on ARM was mildly unstable, but felt it wasn't XFS code, but
> rather the ARM port of Linux.  My test case is a Seagate Dockstar
> hacked to run Linux.

Mine is a Netgear Stora. The interesting bit is that the stock
firmware runs kernel 2.6.22.18 and uses XFS as well, but I don't know
how stable it was to begin with.

>
> I'll see if I can update to the latest kernel and test this use case
> as well - it would be interesting to see how well it works (I'd like
> to run my Dockstar as a mythtv server - stability was good enough for
> proof of concept, but not longer term use).
>
> Thanks,
>
> Paul
>
> On Mon, May 23, 2011 at 5:39 PM, Nuno Subtil <subtil at gmail.com> wrote:
>> I have an MD RAID-1 array with two SATA drives, formatted as XFS.
>> Occasionally, doing an umount followed by a mount causes the mount to
>> fail with errors that strongly suggest some sort of filesystem
>> corruption (usually 'bad clientid' with a seemingly arbitrary ID, but
>> occasionally invalid log errors as well).
>>
>> The one thing in common among all these failures is that they require
>> xfs_repair -L to recover from. This has already caused a few
>> lost+found entries (and data loss on recently written files). I
>> originally noticed this bug because of mount failures at boot, but
>> I've managed to repro it reliably with this script:
>>
>> while true; do
>>        mount /store
>>        (cd /store && tar xf test.tar)
>>        umount /store
>>        mount /store
>>        rm -rf /store/test-data
>>        umount /store
>> done
>>
>> test.tar contains around 100 files with various sizes inside
>> test-data/, ranging from a few hundred KB to around 5-6MB. The failure
>> triggers within minutes of starting this loop.
>>
>> I'm not entirely sure that this is XFS-specific, but the same script
>> does run successfully overnight on the same MD array with ext3 on it.
>> This is on an ARM system running kernel 2.6.39.
>>
>> Has something like this been seen before?
>>
>> Thanks,
>> Nuno
>>
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>