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From: Christian Borntraeger <borntraeger@de.ibm.com>
Subject: 4.19.5 and later has tons of false messages "BUG: non-zero
 pgtables_bytes on freeing mm: -16384"
Date: Thu, 27 Dec 2018 10:13:01 +0100
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To: Martin Schwidefsky <schwidefsky@de.ibm.com>, stable@vger.kernel.org, linux-s390 <linux-s390@vger.kernel.org>, linux-kernel@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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