Re: tests/03r5assemV1 issues

[NeilBrown <neilb@suse.de>]

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On Tue, 03 Jul 2012 18:07:02 +0200 Jes Sorensen <Jes.Sorensen@redhat.com>
wrote:

> NeilBrown <neilb@suse.de> writes:
> > On Mon, 02 Jul 2012 15:24:43 +0200 Jes Sorensen <Jes.Sorensen@redhat.com>
> > wrote:
> >
> >> Hi Neil,
> >> 
> >> I am trying to get the test suite stable on RHEL, but I see a lot of
> >> failures in 03r5assemV1, in particular between these two cases:
> >> 
> >> mdadm -A $md1 -u $uuid $devlist
> >> check state U_U
> >> eval $tst
> >> 
> >> mdadm -A $md1 --name=one $devlist
> >> check state U_U
> >> check spares 1
> >> eval $tst
> >> 
> >> I have tested it with the latest upstream kernel as well and see the
> >> same problems. I suspect it is simply the box that is too fast, ending
> >> up with the raid check completing inbetween the two test cases?
> >> 
> >> Are you seeing the same thing there? I tried playing with the max speed
> >> variable but it doesn't really seem to make any difference.
> >> 
> >> Any ideas for what we can be done to make this case more resilient to
> >> false positives? I guess one option would be to re-create the array
> >> inbetween each test?
> >
> > Maybe it really is a bug?
> > The test harness set the resync speed to be very slow.  A fast box will get
> > through the test more quickly and be more likely to see the array still
> > syncing.
> >
> > I'll try to make time to look more closely.
> > But I wouldn't discount the possibility that the second "mdadm -A" is
> > short-circuiting the recovery somehow.
> 
> That could certainly explain what I am seeing. I noticed it doesn't
> happen every single time in the same place (from memory), but it is
> mostly in that spot in my case.
> 
> Even if I trimmed the max speed down to 50 it still happens.

I cannot easily reproduce this.
Exactly which kernel and which mdadm do you find it with - just to make sure
I'm testing the same thing as you?

Thanks,
NeilBrown


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