The BUG statement which triggers here seems to be introduced by
commit 723cacb
Author: Gerald Schaefer <[email protected]>
Date: Fri Apr 15 16:38:40 2016 +0200
s390/mm: fix asce_bits handling with dynamic pagetable levels
and will be modified by
commit 1aea9b3
Author: Martin Schwidefsky <[email protected]>
Date: Mon Apr 24 18:19:10 2017 +0200
s390/mm: implement 5 level pages tables
Maybe this only happens in certain cases which we do not always hit or
4.12 contains something which starts to use the upgrade incorrectly.
Otherwise we should have observed something like this since Yakkety
(4.8).
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https://bugs.launchpad.net/bugs/1712724
Title:
s390 zKVM complains about "illegal operation" to s390/mm/pgalloc.c
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