Re: AUFS triggers Kernel BUG() in nfs_do_writepage (write.c:276)

[David Mudrich <dmudrich@mudrichsystems.com>]

  Am 30.08.2010 19:28, schrieb Chuck Lever:
> On Aug 30, 2010, at 9:57 AM, David Mudrich wrote:
>
>> Am 30.08.2010 09:41, schrieb sfjro@users.sourceforge.net:
>>> David Mudrich:
>>>> I attached the information you asked for. It seems difficult to have a
>>>> realistic test without AUFS, as it is mounted at the root directory.
>>> Thanx.
>>> It is difficult for me too.
>>> Although I am not confident, these commits (from latest mainline) are
>>> worth to try. If you have no way other than this, you should try.
>>>
>>>
>>> J. R. Okajima
>>>
>> Hello,
>>
>> I applied the patch, same issue.
>> I attached dmesg | tail -n 50.
>>
>> I just tried nfsvers=2 and it works.
>> The problem must be connected with nfs3 writeback.
> Two-phase NFSv3 writes are not like most other file system implementations, so it's not surprising that AUFS might be tripped up.
>
> A possible workaround: If you specify the "sync" mount option when the client mounts the NFS server, it will disable UNSTABLE NFSv3 writes.
mount -o sync was enabled all the time.
>> A copy of this mail goes to the linux-nfs list, maybe they can help to further narrow this.
>>
>>
>> Regards
>>
>> David Mudrich
>> <log.txt>