Re: s390: runtime warning about pgtables_bytes

[Martin Schwidefsky]

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