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From: Christian Borntraeger <borntraeger@de.ibm.com>
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>
Subject: Re: 4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384"
Date: Thu, 27 Dec 2018 10:28:56 +0100	[thread overview]
Message-ID: <1d6288dd-a65b-463a-8aeb-33904dafa9cc@de.ibm.com> (raw)
In-Reply-To: <4e58571e-1991-4a70-7012-ff9dd76afee3@de.ibm.com>



On 27.12.2018 10:13, Christian Borntraeger wrote:
> 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
> 

It seems that adding 

commit 6d212db11947ae5464e4717536ed9faf61c01e86 ("mm: add mm_pxd_folded checks to pgtable_bytes accounting functions") 
fixes the issue. 

Martin, do we need more?

Christian


  reply	other threads:[~2018-12-27  9:29 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-27  9:13 4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384" Christian Borntraeger
2018-12-27  9:28 ` Christian Borntraeger [this message]
2018-12-27 21:01   ` Sasha Levin
2018-12-27 21:06     ` Christian Borntraeger
2018-12-27 22:52       ` Sasha Levin

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