Re: btrfs send and kernel 3.17

[David Arendt <admin@prnet.org>]

On 10/07/2014 03:19 PM, Chris Mason wrote:
>
>
> On Tue, Oct 7, 2014 at 1:25 AM, David Arendt <admin@prnet.org> wrote:
>> I did a revert of this commit. After creating a snapshot, the
>> filesystem was no longer usable, even with kernel 3.16.3 (crashes 10
>> seconds after mount without error message) . Maybe there was some
>> previous damage that just appeared now. This evening, I will restore
>> from backup and report back.
>>
>> On October 7, 2014 12:22:11 AM CEST, Chris Mason <clm@fb.com> wrote:
>>> On Mon, Oct 6, 2014 at 4:51 PM, David Arendt <admin@prnet.org> wrote:
>>>>  I just tried downgrading to 3.16.3 again. In 3.16.3 btrfs send is
>>>>  working without any problem. Afterwards I upgraded again to 3.17 and
>>>>  the
>>>>  problem reappeared. So the problem seems to be kernel version
>>>> related.
>>>
>>> [ backref errors during btrfs-send ]
>>>
>>> Ok then, our list of suspects is pretty short.  Can you easily build
>>> test kernels?
>>>
>>> I'd like to try reverting this commit:
>>>
>>> 51f395ad4058883e4273b02fdebe98072dbdc0d2
>
> Oh no!  Reverting this definitely should not have caused corruptions,
> so I think the problem was already there.  Do you still have the
> filesystem image?
>
> Please let us know if you're missing files off the backup, we'll help
> pull them out.
>
> -chris
>
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Due to space constraints, it was not possible to take an image of the
corrupted filesystem. As I do backups daily, and the problems occurred 5
hours after backup, no file was lost. Thanks for offering your help. In
4 days I will do some send tests on the newly created filesystem and
report back.