From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: 4.1-rc6 radi5 OOPS
Date: Thu, 4 Jun 2015 08:15:57 +1000
Message-ID: <20150604081557.55435f13@notabene.brown>
References: <wrfjlhg0mtmi.fsf@jes.lga.redhat.com>
	<20150604064048.0cb2d7c9@notabene.brown>
	<wrfjzj4glajs.fsf@jes.lga.redhat.com>
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To: Jes Sorensen <Jes.Sorensen@redhat.com>
Cc: linux-raid <linux-raid@vger.kernel.org>, Xiao Ni <xni@redhat.com>
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On Wed, 03 Jun 2015 17:57:43 -0400 Jes Sorensen <Jes.Sorensen@redhat.com>
wrote:

> NeilBrown <neilb@suse.de> writes:
> > On Wed, 03 Jun 2015 16:20:21 -0400 Jes Sorensen <Jes.Sorensen@redhat.co=
m>
> > wrote:
> >
> >> Neil,
> >>=20
> >> I was running testing on the current 4.1-rc6 tree (Linus' top of trunk
> >> 8cd9234c64c584432f6992fe944ca9e46ca8ea76) and I am seeing the following
> >> OOPS which is reproducible.
> >>=20
> >> It shows up when running the mdadm test suite, 07changelevelintr to be
> >> specific.
> >>=20
> >> Is this something you have seen?
> >>=20
> >> Cheers,
> >> Jes
> >>=20
> >> ------------[ cut here ]------------
> >> kernel BUG at drivers/md/raid5.c:5391!
> >
> > No, I haven't seen that.  And I've been running the test suite quite a =
bit
> > lately.
> >
> > Can you get it to print out the relevant numbers?  Include
> > readpos/writepos/safepos too.
>=20
> This enough? Let me know if you need more.
>=20
> I suspect this started happening with the changes that went in between
> 4.1-rc5 and 4.1-rc6. I will try to bisect it tomorrow.
>=20
> Cheers,
> Jes
>=20
> mddev->dev_sectors: 0x9800, reshape_sectors: 0x0200 stripe_addr: ffffffff=
fffffdff, sector_nr 0, readpos 511, writepos -513, safepos 512

Those negative numbers look VERY suspicious.
I'm actually on leave this week so I won't be looking at it any more, but
I'll see what I can find on Monday.
Thanks,
NeilBrown

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