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Sat, 15 Jul 2023 20:12:17 -0700 (PDT) Received: by debian.me (Postfix, from userid 1000) id B7ABF80F26C1; Sun, 16 Jul 2023 10:12:13 +0700 (WIB) Date: Sun, 16 Jul 2023 10:12:13 +0700 From: Bagas Sanjaya To: Mikhail Gavrilov , Linux Memory Management List , Linux Kernel Mailing List , hughd@google.com Cc: Linux Regressions Subject: Re: [bug/bisected] I see "mm/pgtable-generic.c:53: bad pmd (____ptrval____)(8000000100077061)" every boot time Message-ID: References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="xM6pUvZ1vpmzR5ZF" Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: E9119100014 X-Stat-Signature: yyy45f97o7y7w8dnddbexhjn9u9spktc X-HE-Tag: 1689477139-108926 X-HE-Meta: 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 Ow4zYT8L 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --xM6pUvZ1vpmzR5ZF Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jul 15, 2023 at 02:24:59PM +0500, Mikhail Gavrilov wrote: > Hi, > It's ok that I see "mm/pgtable-generic.c:53: bad pmd > (____ptrval____)(8000000100077061)" every boot time? > Unfortunately bisect couldn't say which of commits > # possible first bad commit: > [be872f83bf571f4f9a0ac25e2c9c36e905a36619] mm/pagewalk: > walk_pte_range() allow for pte_offset_map() > # possible first bad commit: > [7780d04046a2288ab85d88bedacc60fa4fad9971] mm/pagewalkers: > ACTION_AGAIN if pte_offset_map_lock() fails > # possible first bad commit: > [2798bbe75b9c2752b46d292e5c2a49f49da36418] mm/page_vma_mapped: > pte_offset_map_nolock() not pte_lockptr() > # possible first bad commit: > [90f43b0a13cddb09e2686f4d976751c0a9b8b197] mm/page_vma_mapped: > reformat map_pte() with less indentation > # possible first bad commit: > [45fe85e9811ede2d65b21724cae50d6a0563e452] mm/page_vma_mapped: delete > bogosity in page_vma_mapped_walk() > # possible first bad commit: > [65747aaf42b7db6acb8e57a2b8e9959928f404dd] mm/filemap: allow > pte_offset_map_lock() to fail > # possible first bad commit: > [0d940a9b270b9220dcff74d8e9123c9788365751] mm/pgtable: allow > pte_offset_map[_lock]() to fail > definitely first bad because my machine on which I am was doing > bisection is unbootable on these commits. > I hope Hugh Dickins can figure out what's going on here. He is the > author of these commits. >=20 > All mine machines are based on the AMD platform two 7950X and one 5900HX. >=20 > It seems that this message is harmless for the system in any way, but > I can't judge it is a bug or not. > >From the user side it looks like regression because on commit > 46c475bd676bb05077c8a38b37f175552f035406 this message was absent. What are you doing on your system that leads into this regression? Anyway, I'm adding this regression to be tracked with regzbot: #regzbot ^introduced: 0d940a9b270b92 #regzbot title: undescribed regression due to allowing failing pte_offset_m= ap[_lock]() Thanks. --=20 An old man doll... just what I always wanted! - Clara --xM6pUvZ1vpmzR5ZF Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSSYQ6Cy7oyFNCHrUH2uYlJVVFOowUCZLNgAgAKCRD2uYlJVVFO o5uJAP9iv4ViJIKdFG+k40g7iok8mka4Z3j6kKH8KU5kHl4aEAEAqhMxhrZhAUHR jW1OtUnuCuHNrm4RxJPOGZpWMi8yZwQ= =JI3s -----END PGP SIGNATURE----- --xM6pUvZ1vpmzR5ZF--