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boundary="------------DWtHSpSEd0NNHYsG9DstVXDz"; protected-headers="v1" From: Demi Marie Obenour To: David Hildenbrand , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, Andrew Morton , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dan Williams , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Jann Horn , Pedro Falcato , Hugh Dickins , Oscar Salvador , Lance Yang Message-ID: Subject: Re: [PATCH v2 6/9] mm/memory: convert print_bad_pte() to print_bad_page_map() References: <20250717115212.1825089-1-david@redhat.com> <20250717115212.1825089-7-david@redhat.com> <30268c21-a907-43d9-ac12-f6215cd95d03@gmail.com> <62cc8974-ddad-44a0-9f7c-e8a75a53ff99@redhat.com> In-Reply-To: <62cc8974-ddad-44a0-9f7c-e8a75a53ff99@redhat.com> Autocrypt-Gossip: addr=jgross@suse.com; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNH0p1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmNvbT7CwHkEEwECACMFAlOMcK8CGwMH CwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCw3p3WKL8TL8eZB/9G0juS/kDY9LhEXseh mE9U+iA1VsLhgDqVbsOtZ/S14LRFHczNd/Lqkn7souCSoyWsBs3/wO+OjPvxf7m+Ef+sMtr0 G5lCWEWa9wa0IXx5HRPW/ScL+e4AVUbL7rurYMfwCzco+7TfjhMEOkC+va5gzi1KrErgNRHH kg3PhlnRY0Udyqx++UYkAsN4TQuEhNN32MvN0Np3WlBJOgKcuXpIElmMM5f1BBzJSKBkW0Jc Wy3h2Wy912vHKpPV/Xv7ZwVJ27v7KcuZcErtptDevAljxJtE7aJG6WiBzm+v9EswyWxwMCIO RoVBYuiocc51872tRGywc03xaQydB+9R7BHPzsBNBFOMcBYBCADLMfoA44MwGOB9YT1V4KCy vAfd7E0BTfaAurbG+Olacciz3yd09QOmejFZC6AnoykydyvTFLAWYcSCdISMr88COmmCbJzn sHAogjexXiif6ANUUlHpjxlHCCcELmZUzomNDnEOTxZFeWMTFF9Rf2k2F0Tl4E5kmsNGgtSa aMO0rNZoOEiD/7UfPP3dfh8JCQ1VtUUsQtT1sxos8Eb/HmriJhnaTZ7Hp3jtgTVkV0ybpgFg w6WMaRkrBh17mV0z2ajjmabB7SJxcouSkR0hcpNl4oM74d2/VqoW4BxxxOD1FcNCObCELfIS auZx+XT6s+CE7Qi/c44ibBMR7hyjdzWbABEBAAHCwF8EGAECAAkFAlOMcBYCGwwACgkQsN6d 1ii/Ey9D+Af/WFr3q+bg/8v5tCknCtn92d5lyYTBNt7xgWzDZX8G6/pngzKyWfedArllp0Pn fgIXtMNV+3t8Li1Tg843EXkP7+2+CQ98MB8XvvPLYAfW8nNDV85TyVgWlldNcgdv7nn1Sq8g HwB2BHdIAkYce3hEoDQXt/mKlgEGsLpzJcnLKimtPXQQy9TxUaLBe9PInPd+Ohix0XOlY+Uk QFEx50Ki3rSDl2Zt2tnkNYKUCvTJq7jvOlaPd6d/W0tZqpyy7KVay+K4aMobDsodB3dvEAs6 ScCnh03dDAFgIq5nsB11j3KPKdVoPlfucX2c7kGNH+LUMbzqV6beIENfNexkOfxHfw== --------------DWtHSpSEd0NNHYsG9DstVXDz Content-Type: multipart/mixed; boundary="------------0KANSCkr0uT00wHzumcwyJIO" --------------0KANSCkr0uT00wHzumcwyJIO Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/18/25 03:44, David Hildenbrand wrote: > On 18.07.25 00:06, Demi Marie Obenour wrote: >> On 7/17/25 07:52, David Hildenbrand wrote: >>> print_bad_pte() looks like something that should actually be a WARN >>> or similar, but historically it apparently has proven to be useful to= >>> detect corruption of page tables even on production systems -- report= >>> the issue and keep the system running to make it easier to actually d= etect >>> what is going wrong (e.g., multiple such messages might shed a light)= =2E >>> >>> As we want to unify vm_normal_page_*() handling for PTE/PMD/PUD, we'l= l have >>> to take care of print_bad_pte() as well. >>> >>> Let's prepare for using print_bad_pte() also for non-PTEs by adjustin= g the >>> implementation and renaming the function -- we'll rename it to what >>> we actually print: bad (page) mappings. Maybe it should be called >>> "print_bad_table_entry()"? We'll just call it "print_bad_page_map()" >>> because the assumption is that we are dealing with some (previously) >>> present page table entry that got corrupted in weird ways. >>> >>> Whether it is a PTE or something else will usually become obvious fro= m the >>> page table dump or from the dumped stack. If ever required in the fut= ure, >>> we could pass the entry level type similar to "enum rmap_level". For = now, >>> let's keep it simple. >>> >>> To make the function a bit more readable, factor out the ratelimit ch= eck >>> into is_bad_page_map_ratelimited() and place the dumping of page >>> table content into __dump_bad_page_map_pgtable(). We'll now dump >>> information from each level in a single line, and just stop the table= >>> walk once we hit something that is not a present page table. >>> >>> Use print_bad_page_map() in vm_normal_page_pmd() similar to how we do= it >>> for vm_normal_page(), now that we have a function that can handle it.= >>> >>> The report will now look something like (dumping pgd to pmd values): >>> >>> [ 77.943408] BUG: Bad page map in process XXX entry:80000001233f58= 67 >>> [ 77.944077] addr:00007fd84bb1c000 vm_flags:08100071 anon_vma: ... >>> [ 77.945186] pgd:10a89f067 p4d:10a89f067 pud:10e5a2067 pmd:10532706= 7 >>> >>> Not using pgdp_get(), because that does not work properly on some arm= >>> configs where pgd_t is an array. Note that we are dumping all levels >>> even when levels are folded for simplicity. >>> >>> Signed-off-by: David Hildenbrand >> >> Should this still use a WARN? If the admin sets panic-on-warn they >> have asked for "crash if anything goes wrong" and so that is what >> they should get. Otherwise the system will still stay up. >=20 > I assume you're comment is in context of the other proposal regarding=20 > panicking. Which one? I'm only subscribed to xen-devel and might have missed it. > It's a good question whether we should WARN: likely we should convert=20 > the "BUG:" ... message into a WARN. On panic-on-warn you'd panic=20 > immediately without being able to observe any other such messages (and = > as discussed in the RFC, apparently that can be valuable for debugging,= =20 > because a single such report is often insufficient) >=20 > But as panic-on-warn is "panic on the first sight of a problem", that=20 > sounds right. There are other advantages to WARN() as well: - Automated tools (like syzkaller) know how to deal with it (though they probably know how to deal with this too). - It counts against kernel.warn_limit, so an administrator can choose to have the system panic if there are a huge number of warnings. (My completely uninformed guess is that "other such messages" would usually be less than 100, and that once one has gotten into the quadruple digits, the kernel is probably hopelessly confused.) - It shows up in /sys/kernel/warn_count. > That change should not be part of this patch, though. 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