Re: Problem with array raid10 array resync on 4.4.0 (keeps reyncing each reboot)

[Shaohua Li <shli@kernel.org>]

On Wed, Jan 27, 2016 at 08:24:29AM +0100, Eric Valette wrote:
> On 27/01/2016 00:31, Shaohua Li wrote:
> >On Tue, Jan 26, 2016 at 03:49:42PM +0100, Eric Valette wrote:
> >>Hi,
> >>
> >>My raid 10 array (5 disk with one spare) was doing a  resync after an
> >>upgrade to 4.4.0 from 4.1.15. The resync progress was steady and at the end
> >>the /proc/mdstat was apparently complete but when rebooting, it started
> >>resycing over and over. I noticed my dmesg was totally filled with raid10
> >>conf printout message so it was impossible to trace anything else.
> >>
> >>Did a resync test with 3.14.58 (because I knew it had worked for resync
> >>before and was still available as a boot option)  and the array was
> >>correctly rebuild.
> >>Runs fine with 4.1.16 now.
> >>
> >>Please CC me as I'm not subscribed.
> >
> >Could you please provide more info, like mdadm -D /dev/md0 in v4.4? If you run
> >a stop/reassemble, does the resync start?
> 
> I'm not going to retry kernel 4.4.0 on this device as I'm no more confident
> about raid10 support with this 4.4 version.

Thanks! I know switching to a kernel which is not working well is risky, but
the info from 4.1 doesn't have enough info for debuging. I also tried to
reproduce the issue locally, but no success. Did you have any other info which
could help debugging, for example special config?

Thanks,
Shaohua