Snapshot corruption on 6.1/amd64

[Stephen J. Roznowski]

On 13 Nov, Lapo Luchini wrote:
> Kostik Belousov <kostikbel <at> gmail.com> writes:
> 
>> > >After some searching, I've found a bug report filed last year that
>> > >describes this problem exactly, though the log of that report does
>> > >not suggest that anything has been done with it.  That report is at
>> > >http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/90512
>>
>> James, look at the PR/100365. Supposed fix is MFCed. Original reporter
>> said that this changed nothing for him. I have not much time lately to
>> look at this problem, but would like to get additional data points.

As the submitter of 100365, I still don't think that snapshots on amd64
are working correctly. When I (still) run the code attached to the PR,
I still see a problem -- the problem is that sometimes the filesystem
is busy and mksnap_ffs "errors out" and doesn't create a snapshot. I
spent a little bit of time looking at mksnap_ffs to see if I could get
it to retry the snapshot if the filesystem is busy to no avail.

I've given up on my automated script to do a backup and just generate
(and fsck by hand) a snapshot until I get a working one....

Thanks,
-SR
-- 
Stephen J. Roznowski    (sjr at comcast.net)