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Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1xOcCo-007nSH-1w; Wed, 04 Nov 2026 14:43:14 +0000 Date: Wed, 4 Nov 2026 06:43:09 -0800 From: Breno Leitao To: "David Hildenbrand (Arm)" Cc: Andrew Morton , Miaohe Lin , Naoya Horiguchi , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , SJ Park , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, kernel-team@meta.com Subject: Re: [PATCH v3] tools/mm: add hwpoison-panic tool Message-ID: References: <20260813-memory_failure_rewrite_test-v3-1-f9fb6542cbff@debian.org> <12f80449-9d6c-4fb7-bcc4-e7d38e868da2@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <12f80449-9d6c-4fb7-bcc4-e7d38e868da2@kernel.org> X-Debian-User: leitao X-Stat-Signature: cwusoknw11dbfny71z14shyw4uoaxaks X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1E05E1A000A X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1793803409-199636 X-HE-Meta: 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 6ufRvg+w k1up+teDI9wiF/fgDTPdsEq+gXqQtglwF24h4qdAHUK0FezxCoCNaZgu2EBdWdSssnPFCvzsO9kKoTdr7e8nS3Lyig5BITrZcUpnq7GurbVRUO7ydxypnd05Y/Uwi7NWQdQug1zMaM/ASJpvSO3p3MmUOvy27Wc+PTzhlH7t/H/3JwHoCNR6OovXxBDZZ+Zyl1vZDi/4TACstZP6wM8CjM6QUX0tlEzhsisR61BBw3EfueFyRzeXcjSMvStfJ35I2v9ixXgHhVwXa9k/YPnoRbezOHT6umfn/wlF3IT/sb0HDVOPXfkk6bSoVCaMVBlI08urIWPr6zddM+Kc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Nov 04, 2026 at 03:35:16PM +0100, David Hildenbrand (Arm) wrote: > On 8/13/26 13:45, Breno Leitao wrote: > > Add a tool that enables the vm.panic_on_unrecoverable_memory_failure > > sysctl, picks a kernel-owned PFN and writes its physical address to > > hard_offline_page. Three page kinds are selectable with -k: rodata > > (default), slab or pgtable. In all cases the host should panic. > > > > Example: > > > > # ./hwpoison-panic -k slab --yes-panic-my-kernel > > injecting hwpoison at phys 0x100032000 (pfn 0x100032, kind=slab) > > expecting kernel panic: 'Memory failure: : unrecoverable page' > > > > In dmesg, you will see: > > > > Memory failure: 0x100032: unhandlable page. > > Memory failure: 0x100032: recovery action for reserved kernel page: Ignored > > Kernel panic - not syncing: Memory failure: 0x100032: unrecoverable page > > > > This lives in tools/mm rather than selftests/mm because every successful > > run crashes the machine, which is not something to run from CI. > > > > The --yes-panic-my-kernel argument is required so an accidental > > invocation does not take the box down. > > This is not upstream yet, right? Right. :-( > Anything missing or is this good to go in? I would say this is good to go, David. --breno