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Tue, 25 Aug 2020 07:44:21 +0000 (UTC) X-HE-Tag: judge37_4c030332705a X-Filterd-Recvd-Size: 4728 Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Tue, 25 Aug 2020 07:44:20 +0000 (UTC) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4BbLbb0zRZz9sTY; Tue, 25 Aug 2020 17:44:11 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=canb.auug.org.au; s=201702; t=1598341457; bh=Y7qAOm5LXj3xJO1LU4/Uc9yKGGyRuix0iKjtoR5Ybwc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=pgC21sqz65fkwXGPg1EjAn6DYcG7FDJ2dkW3Xt++e2hodyY7IDjPbmP1ThGopEZt7 N7zwytmjKsXkZpmrmzMWYQZ3Ev1ii1RjEXYowBSHiqKFfmz7kf+raEUT+bNzKH8etX aUlVKvw2qXS6zM78dURS7e+z3IVSPUA+vJOjQD/36p5Pl10NOspmjX2eqIw97v6nbS H1oWoMAVl4V2b4RApkVbG4fEgdcLPT7/7i/g64AJw0tMv5lzoP2lsGCNQokI6taMVG Y54H1X33vqBOGURyOYenuLLKzFJVvQmZK95AjFybhysrpAjNScXw1GTf4ZHddt/xPI YFPXyhtZVB16Q== Date: Tue, 25 Aug 2020 17:44:10 +1000 From: Stephen Rothwell To: Naresh Kamboju Cc: Matthew Wilcox , linux-mm , Linux-Next Mailing List , open list , lkft-triage@lists.linaro.org, Andrew Morton , LTP List , Arnd Bergmann , Russell King - ARM Linux , Mike Rapoport , Catalin Marinas , Christoph Hellwig , Andy Lutomirski , Peter Xu , opendmb@gmail.com, Linus Walleij , afzal.mohd.ma@gmail.com, Will Deacon , Greg Kroah-Hartman Subject: Re: BUG: Bad page state in process true pfn:a8fed on arm Message-ID: <20200825174410.1af823db@canb.auug.org.au> In-Reply-To: References: <20200824110645.GC17456@casper.infradead.org> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/Z40Eod_0LnLaojqiTY7/wC+"; protocol="application/pgp-signature"; micalg=pgp-sha256 X-Rspamd-Queue-Id: E95EF3D663 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --Sig_/Z40Eod_0LnLaojqiTY7/wC+ Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Hi all, On Tue, 25 Aug 2020 13:03:53 +0530 Naresh Kamboju wrote: > > On Mon, 24 Aug 2020 at 16:36, Matthew Wilcox wrote: > > > > On Mon, Aug 24, 2020 at 03:14:55PM +0530, Naresh Kamboju wrote: =20 > > > [ 67.545247] BUG: Bad page state in process true pfn:a8fed > > > [ 67.550767] page:9640c0ab refcount:0 mapcount:-1024 =20 > > > > Somebody freed a page table without calling __ClearPageTable() on it. = =20 >=20 > After running git bisect on this problem, > The first suspecting of this problem on arm architecture this patch. > 424efe723f7717430bec7c93b4d28bba73e31cf6 > ("mm: account PMD tables like PTE tables ") >=20 > Reported-by: Naresh Kamboju > Reported-by: Anders Roxell >=20 > Additional information: > We have tested linux next by reverting this patch and confirmed > that the reported BUG is not reproduced. >=20 > These configs enabled on the running device, >=20 > CONFIG_TRANSPARENT_HUGEPAGE=3Dy > CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=3Dy >=20 >=20 > -- Suspecting patch -- > commit 424efe723f7717430bec7c93b4d28bba73e31cf6 > Author: Matthew Wilcox > Date: Thu Aug 20 10:01:30 2020 +1000 >=20 > mm: account PMD tables like PTE tables OK, I have reverted that patch from todays' linux-next. --=20 Cheers, Stephen Rothwell --Sig_/Z40Eod_0LnLaojqiTY7/wC+ Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEENIC96giZ81tWdLgKAVBC80lX0GwFAl9EwUoACgkQAVBC80lX 0GxJJwf/VPBxX45ROMwkoKpUInftEerYb6NZ5Muk8AS1xBRl0rD+0luk9VA1ABGi TzqC7jVz4maQV4fxLZH9+sMMvVkaW9ltHXDgxmoksmFNvLBPkVdMOWNyEYIecxAX zExf6S4P2NsZ8yky3DSEW+nOhFqCuktnR91sJXhUN45buP9vKKmszqgtFOrdNtkG rwUlJP2GHr0TOLvEUKthE3lUnxL/whN2X5ZDYj/0HiIn00C0YSbLF3vGyFnlwKy8 lkMCk87hk+xKpND9DEk/IjcpLPIaJfFiVhxucEAgDjFv3/uRb/D+owtmdXAmRKip /3gVT9vtSLlOrwBo95Pu4mB1Ke46YQ== =bf3j -----END PGP SIGNATURE----- --Sig_/Z40Eod_0LnLaojqiTY7/wC+--