linux-kernel - Re: arm64: segfaults on next-20170602 with LTP tests

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Message-ID: <20170602144204.uyvbby5vauxpt6yr@yury-thinkpad>
Date:   Fri, 2 Jun 2017 17:42:04 +0300
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     Will Deacon <will.deacon@....com>
Cc:     punit.agrawal@....com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, steve.capper@....com
Subject: Re: arm64: segfaults on next-20170602 with LTP tests

On Fri, Jun 02, 2017 at 03:37:51PM +0300, Yury Norov wrote:
> On Fri, Jun 02, 2017 at 01:19:18PM +0100, Will Deacon wrote:
> > Hi Yury,
> > 
> > [adding Steve and Punit]
> > 
> > On Fri, Jun 02, 2017 at 02:11:51PM +0300, Yury Norov wrote:
> > > I see that latest and yesterday's linux-next segfaults with tests pth_str01,
> > > pth_str03, rwtest04. Rwtest04 hangs sometimes. Crashes are not always
> > > reproducible. About week ago everything was fine. Kernel log and config file
> > > are attached. The testing is performed on qemu.
> > 
> > It's weird that these haven't cropped up in our nightly tests, especially
> > given that defconfig is very similar to the one you're using. That said,
> > I see huge pmds cropping up in the traces below and there have been some
> > recent changes from Punit and Steve in that area, in particular things
> > like 55f379263bcc ("mm, gup: ensure real head page is ref-counted when using
> > hugepages").
> > 
> > Are you in a position to bisect this, or is it too fiddly to reproduce?

I have bisected the bug to exactly this patch. If I revert it, the
pth_str01/03 are passed.

Yury