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b=SNRktYnEK7R9VzzxgyiWbfu//bLlEPx/3iTGJPYJdLhai16FG6aTFMGU7JaT84h4M BZEiUB1axFm6wSUaqikzT6RE1ZoaRJeioaFzRzmxOJRsIJlbJw0kxd+cc4GgPEiLRQ ow4txwe8rn5oRcUGBeG620aug3LlerZYFAaHdf8pbsuss0xkr6v2qqbCHbeIOslQpG b2+sCRTcAHTYIaiKX1n/ZSzg0I3Is3olC9np5K1rB2CFpQPyrr7gJlAEG+6v2h+m83 6zId4Q7f2KOeGRM+tXszpsKBfd/MDgXM/XrYQCVCtnJEGCzXCNX09K1Cy1vIQh6UE8 mWCea77kqo/uw== Message-ID: <3c5b9d1e-5ed4-4bd1-b532-39f2d4612965@kernel.org> Date: Sat, 3 Oct 2026 16:14:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] secretmem: SIGBUS on memfd_secret() pages while perf record runs To: Ameer Hamza , ljs@kernel.org, rppt@kernel.org, peterz@infradead.org Cc: akpm@linux-foundation.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, sashal@kernel.org, alexander.motin@truenas.com, caleb.stjohn@truenas.com References: <20261002175651.811343-1-ameer.hamza@truenas.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: 9hcp9jgncwhs8ai5ksisfkpemodk61z9 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 21B584000C X-HE-Tag: 1791036901-860437 X-HE-Meta: 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 QxmMqN8G jLcqVDJ0KGrGNaCQGdnKKaPZS1E+bA6Kwi3iMgieCj93akXSGt1oad0GGP8gjkzVPaSb7Px32v89T7jcKfF/EZEzoiThXrv1EPsCUpppx+Xx68a/WJXO/m+4+NxrDUtdhy/5ItQCzVEiRlWUHscpC+EYhadRlhQLxz9TghvN+BemPBmYBrUGb3hm2ucs7Zoihoq6yzyh4FLYLNb1r0kbB6JjEQ5RkLznP5TIvz+lnVuvQpVJ2Z/r1KCTMCzP5SXZ8JnPXOH/nlYtK0531uX8LazxDrAbEO3XQQfQUUKQib30HvTqm5nVc9O+xhZI5BQE685eav05qqUijKF8DTPNySXiE1VhW+ZHrda98FKL7lqqMMOQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/2/26 19:56, Ameer Hamza wrote: > Hi, > Hi! > 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. This happens for root as well as for an unprivileged > user running its own perf record. It reproduces on v7.3-rc4 and > 6.18.52, and the same test passes without the recording or with the > commit reverted. Thanks for the report! May I know whether this problem was found by (a) A real workload (b) A test case (c) Complains by some tooling I am asking, because so far I was under the assumption that secretmem isn't heavily used in the wild. -- Cheers, David