From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: 4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384" References: <4e58571e-1991-4a70-7012-ff9dd76afee3@de.ibm.com> <1d6288dd-a65b-463a-8aeb-33904dafa9cc@de.ibm.com> <20181227210136.GV86645@sasha-vm> From: Christian Borntraeger Date: Thu, 27 Dec 2018 22:06:09 +0100 MIME-Version: 1.0 In-Reply-To: <20181227210136.GV86645@sasha-vm> Content-Language: en-US Message-Id: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: Sasha Levin Cc: Martin Schwidefsky , stable@vger.kernel.org, linux-s390 , linux-kernel@vger.kernel.org, Greg Kroah-Hartman List-ID: On 12/27/2018 10:01 PM, Sasha Levin wrote: > On Thu, Dec 27, 2018 at 10:28:56AM +0100, Christian Borntraeger wrote: >> >> >> 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 >>> 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. > > I've queued 6d212db11947 for 4.19 for now, thank you. Not sure, but you might need 1071fc5779d98 mm: introduce mm_[p4d|pud|pmd]_folded a8874e7e8a889 mm: make the __PAGETABLE_PxD_FOLDED defines non-empty to avoid compile errors on !s390.