s390: runtime warning about pgtables_bytes

[Li Wang <liwang@xxxxxxxxxx>]

Hi,

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

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Regards,

Li Wang