linux-kernel - Re: s390: runtime warning about pgtables

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Message-Id: <20181011150211.7d8c07ac@mschwideX1>
Date:   Thu, 11 Oct 2018 15:02:11 +0200
From:   Martin Schwidefsky <schwidefsky@...ibm.com>
To:     Li Wang <liwang@...hat.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Janosch Frank <frankja@...ux.vnet.ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: s390: runtime warning about pgtables_bytes

On Thu, 11 Oct 2018 18:04:12 +0800
Li Wang <liwang@...hat.com> wrote:

> When running s390 system with LTP/cve-2017-17052.c[1], the following BUG is
> came out repeatedly.
> I remember this warning start from kernel-4.16.0 and now it still exist in
> kernel-4.19-rc7.
> Can anyone take a look?
> 
> [ 2678.991496] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.001543] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.002453] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.003256] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.013689] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.024647] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.064408] BUG: non-zero pgtables_bytes on freeing mm: 16384
> [ 2679.133963] BUG: non-zero pgtables_bytes on freeing mm: 16384
> 
> [1]:
> https://github.com/linux-test-project/ltp/blob/master/testcases/cve/cve-2017-17052.c
 
Confirmed, I see this bug with cvs-2017-17052 on my LPAR as well.
I'll look into it.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.