4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384"

Christian Borntraeger
2018-12-27T09:13:01Z

Martin,

Right now you get a message
"BUG: non-zero pgtables_bytes on freeing mm: -16384"
for EVERY process that exits in 4.19.5 and later.

bisect points to
commit 4136161d676a93fc8df6bdb80d720c15522d6c24
Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Mon Oct 15 11:09:16 2018 +0200

s390/mm: fix mis-accounting of pgtable_bytes

[ Upstream commit e12e4044aede97974f2222eb7f0ed726a5179a32 ]

Turns out that this patch requires several dependencies so the autoselection of this
patch was missing that.

Can we either revert this patch or add the dependencies?

Christian