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From:   Yuri Norov <ynorov@marvell.com>
To:     Qian Cai <cai@lca.pw>, Dexuan-Linux Cui <dexuan.linux@gmail.com>,
        "Mike Kravetz" <mike.kravetz@oracle.com>
CC:     "Huang, Ying" <ying.huang@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
        Andrea Parri <andrea.parri@amarulasolutions.com>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Michal Hocko <mhocko@suse.com>,
        Minchan Kim <minchan@kernel.org>,
        Hugh Dickins <hughd@google.com>,
        Dexuan Cui <decui@microsoft.com>,
        "v-lide@microsoft.com" <v-lide@microsoft.com>,
        "Yury Norov" <yury.norov@gmail.com>
Subject: Re: [PATCH -mm] mm, swap: Fix bad swap file entry warning
Thread-Topic: [PATCH -mm] mm, swap: Fix bad swap file entry warning
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Date:   Sat, 1 Jun 2019 04:25:35 +0000
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(Resend as LKML didn't take outlook settings.)

> On Fri, 2019-05-31 at 11:27 -0700, Dexuan-Linux Cui wrote:
> > Hi,
> > Did you know about the panic reported here:
> >  https://marc.info/?t=3D155930773000003&r=3D1&w=3D2
> >=20
> > "Kernel panic - not syncing: stack-protector: Kernel stack is
> > corrupted in: write_irq_affinity.isra> "
> >=20
> > This panic is reported on PowerPC and x86.
> >=20
> > In the case of x86, we see a lot of "get_swap_device: Bad swap file ent=
ry"
> > errors before the panic:
> >=20
> > ...
> > [=A0=A0=A024.404693] get_swap_device: Bad swap file entry 5800000000000=
001
> > [=A0=A0=A024.408702] get_swap_device: Bad swap file entry 5c00000000000=
001
> > [=A0=A0=A024.412510] get_swap_device: Bad swap file entry 6000000000000=
001
> > [=A0=A0=A024.416519] get_swap_device: Bad swap file entry 6400000000000=
001
> > [=A0=A0=A024.420217] get_swap_device: Bad swap file entry 6800000000000=
001
> > [=A0=A0=A024.423921] get_swap_device: Bad swap file entry 6c00000000000=
001

[..]

I don't have a panic, but I observe many lines like this.

> Looks familiar,
>
> https://lore.kernel.org/lkml/1559242868.6132.35.camel@lca.pw/
>
> I suppose Andrew might be better of reverting the whole series first befo=
re Yury
> came up with a right fix, so that other people who is testing linux-next =
don't
> need to waste time for the same problem.

I didn't observe any problems with this series on top of 5.1, and there's a=
 fix for swap\
that eliminates the problem on top of current next for me:
https://lkml.org/lkml/2019/5/30/1630

Could you please test my series with the patch above?

Thanks,
Yury

     =