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b=RKqmEfKRxP8fAHQMJMcrK1N47J5Kf29T154D+wJlWpgAcpFhX73rOYp/QpS5LFWtf T9lo54D1QXoEUSj8pch7RiOpTACrtNAi9ja7Te1FUor5TyK6i5aYSaAPKoLYR8KHOu 0rusExbXF+n6zMnAqfBNkulPB9xvjjKeCX8BsQjsRfh+xTRxRDmfU4TaFvJFZMpxVX QZVpVqZkWvRs5oKNSoInnQfjiAkxYiS1Lr6FLizYmlNbGiFkOveLc/WnntNlquuVNn GDsC0F0hF6aZ84lDwR+S+loJJVUpF9EfcLk9zrDKe9gi3N/9hkSJWXqqjwM5SuIs2Y UbWYGOgiuNjNw== Message-ID: Date: Mon, 5 Oct 2026 12:38:09 +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 Cc: ljs@kernel.org, rppt@kernel.org, peterz@infradead.org, 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> <3c5b9d1e-5ed4-4bd1-b532-39f2d4612965@kernel.org> 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: x7mpnb91z1kkjbenmqsb9edt986tb1qb X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0FE3B1A0003 X-HE-Tag: 1791196697-578309 X-HE-Meta: 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 rZizTITQ RsWyMKOJcL4z2rcdssdF56vSIzmvI59CqTqeM2RztUBmo2mxyW4gxgWjgQ7JEybXYJHhrNiMJARS+/LlTFiUGBatxrw6MzbYMBpxF5ksUPaiaI5aZWCcZ/DB1EfExLHesCyrz5oBnVGdzHgo7RC4T3QX9QuX6rla+x8oCHrnAH7uQyja1iSkWJXGldivxngUmKkwTzQPGjoY3TQLVEge0zHA3gJOZJiaYCKwGR5j+Q8//pXNv782yDD9b/hRvC5tgQLcYGkg2D/r+wFtMYlpQwd5yJWiCVK5SPZnFW/NMJ15VfdFRfqHXK4xctw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/3/26 19:05, Ameer Hamza wrote: > On Sat, Oct 03, 2026 at 04:14:49PM +0200, David Hildenbrand (Arm) wrote: >> May I know whether this problem was found by >> >> (a) A real workload >> >> (b) A test case >> >> (c) Complains by some tooling > > (a). A root userspace process that keeps secrets in memfd_secret() > failed while perf record ran on the same machine. I reduced it to the > snippet in the report. Thanks! -- Cheers, David