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b=QH3fiBToKGh2utYkFO6TLH5i8kObVvKBj6ZhRijieTlGZO3XsIs9Q1/n+IKqEZK4N qKne7nLlSx+/5pAdPjCx7AREXyMAv8vTNFWaCzBWaLMzwfiKlXjAHUUjT6OsQAUkmn v7VAdfGlLG0x0NsRrER1auFt31TZ2H9/YSJXFuXbyZMXTEnjD4spdwIMRDGSCVwCsS jAnZziYtSxMGNME0FJRT1rRPgLdSGb/XnoKvQCW7xr0T7WD8UQ7Q+0GDXW9JjlZ+3R p9ZQu7BJf0EtHwkhIIqzddqA+DSU15q0Oyftd6reKmDjj8vX3W5bEpMRkNdY1hGLH+ ooL/QkyMoUpbg== Date: Fri, 9 Oct 2026 12:56:57 +0100 From: "Lorenzo Stoakes (ARM)" To: Sasha Levin Cc: rppt@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, david@kernel.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev, stable@vger.kernel.org, 4ncienth@gmail.com, alexander.motin@truenas.com, caleb.stjohn@truenas.com, ameer.hamza@truenas.com Subject: Re: [REGRESSION] secretmem: SIGBUS on memfd_secret() pages while perf record runs Message-ID: References: <20261002175651.811343-1-ameer.hamza@truenas.com> <2026-10-04-1-daily-reply-0001-secretmem-requeue@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2026-10-04-1-daily-reply-0001-secretmem-requeue@kernel.org> X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2A78B40006 X-Rspam-User: X-Stat-Signature: 585u1g1ai6iygqdurn8as7z38wuzi864 X-HE-Tag: 1791547026-135514 X-HE-Meta: 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 O0JjlQH4 a5ov3Etj6fB1Kf1Vu/4yjaiez6nPlhuytrHnXDVy1ZQ+hy60u5l2cW3P+JO+4C3X7UNHPf/7G1g841Ayi26bWVIkmNf6ppHZNROzX9Rj5qpFsQSoeC/v/BRMOlAHF6toSEjecTKjHASzd8vGoKKdcucfZzMnmERG5kWWQgkVEU69rbYRA05GEMI8SLVhgGqxgO4cBxFTXJ+9xTtDjUNu/AIRj7ABdYMc7SmpwNuNZCTFQoQybBz6wJGHlSmzQOF/C6+xBPrvNUoJWfHMAWIH0k3AwoZ3bmLvW3P3e0wtFr0GE7jPPsXHMpmePsmYORBtr1n/Jb2H+wIsr21aiwAa+aOoyKcl3IY//w4O1lQWNe4gL9449d5vwWFzZeA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Oct 04, 2026 at 12:29:39PM -0400, Sasha Levin wrote: > > Since commit 97d34aa65c29 ("mm/secretmem: properly account locked > > pages"), in v7.3-rc2 and the 6.18.52 and 7.2.5 backports, touching a > > memfd_secret() page for the first time fails with SIGBUS while the > > same user is running perf record, and read() into such a page fails > > with EFAULT. > > Re-queued the secretmem accounting fix for 6.12, 6.6 and 6.1, per Lorenzo. > The perf fix will be needed on these trees once it lands. Thanks! Perf fix sent at [0], LPC will be slowing everybody down though I expect! -- Cheers, Lorenzo [0]:https://lore.kernel.org/all/20261003-perf-locked-vm-fix-v1-1-d214dcaf0d76@kernel.org/