Re: 4.1-rc6 radi5 OOPS

[NeilBrown <neilb@suse.de>]

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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.com>
> > wrote:
> >
> >> Neil,
> >> 
> >> 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.
> >> 
> >> It shows up when running the mdadm test suite, 07changelevelintr to be
> >> specific.
> >> 
> >> Is this something you have seen?
> >> 
> >> Cheers,
> >> Jes
> >> 
> >> ------------[ 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.
> 
> This enough? Let me know if you need more.
> 
> 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.
> 
> Cheers,
> Jes
> 
> mddev->dev_sectors: 0x9800, reshape_sectors: 0x0200 stripe_addr: fffffffffffffdff, 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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