From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5D3FE606A31B for ; Tue, 27 Oct 2026 01:06:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20251104 header.b=Xtj1CBUS Received: by kanga.kvack.org (Postfix) id 0F61B6B05B0; Mon, 26 Oct 2026 21:06:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0A7026B05B1; Mon, 26 Oct 2026 21:06:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EFE006B05B2; Mon, 26 Oct 2026 21:06:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id B1EDC6B05B0 for ; Mon, 26 Oct 2026 21:06:52 -0400 (EDT) Received: from smtpin22.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 2378E140303 for ; Tue, 27 Oct 2026 01:06:52 +0000 (UTC) X-FDA: 85366616664.22.8F72FBB Received: from mail-ej1-f45.google.com (mail-ej1-f45.google.com [209.85.218.45]) by imf25.hostedemail.com (Postfix) with ESMTP id 3804BA0008 for ; Tue, 27 Oct 2026 01:06:50 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=gmail.com header.s=20251104 header.b=Xtj1CBUS; spf=pass (imf25.hostedemail.com: domain of krystianmkaniewski@gmail.com designates 209.85.218.45 as permitted sender) smtp.mailfrom=krystianmkaniewski@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1793063210; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=aJI0hb4/E//vLxc2EVc1E27ZXseuwybs0SN1EQUknec=; b=M3G7FJ8QOyXxirYgdNWCrQQCU3920M1s3eELEQc91L15sSu3pT5sONadvH9h8yzvLXNJwN rWXU1/PrZk8A0VBSTP0ld29oINUs1qE54xTwJ3uqiDOw1KDxnHgJgCnYBT4Pp9FO8HSpx3 er2LJscCjlwzOVR4R+4CD5BDlTnkdHo= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=gmail.com header.s=20251104 header.b=Xtj1CBUS; spf=pass (imf25.hostedemail.com: domain of krystianmkaniewski@gmail.com designates 209.85.218.45 as permitted sender) smtp.mailfrom=krystianmkaniewski@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1793063210; b=3OcqDWV/YhrEMT/UoHjlopRiM7PLR4JnZDVl+ZQg5mmDGL4y1nZJ6mvvxUQJ/O46jwcxnk MyJlOPp7NqL5B6y4yCnl4iVxQKLQu78q1QDu8CpMzF9IRMlcgp4LetgjcxeKRI3YY05XKJ 9aQM4e9zygRifD53Era+hH/e7xods8k= Received: by mail-ej1-f45.google.com with SMTP id a640c23a62f3a-c315869241fso467858566b.0 for ; Mon, 26 Oct 2026 18:06:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1793063209; x=1793668009; darn=kvack.org; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=aJI0hb4/E//vLxc2EVc1E27ZXseuwybs0SN1EQUknec=; b=Xtj1CBUScA8jFCX+R3PFx4FhtfQuZkqAjiw+SBp1eQxwXpIiHZiQYaGMnhLw0RWt4I AKovfnbsW2Ii3cA7wC0qN30TlQXYO+KfL5D5d8msqnP3drnhwIdYZLwm7knZblxwp5hL ZmQ9+4YdWtA4/i2K0+1BPVA6ntAIftI4Lk7N4iE3sjAm3aMed0gsIUZ941GQB850F+se 6qkr6LgrTG1NL8AKEWkVzCoVHptuPxRaAzoy/GQdp7q2VLkXAVsCbnZ/OGrGjbFZmdT5 PzGZMhLLBE9TikEN9WgsYcl/5eAtJtev4j0HFImUhFKwVifP4QdJUmmjECxVWMwm/nXV eLww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793063209; x=1793668009; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=aJI0hb4/E//vLxc2EVc1E27ZXseuwybs0SN1EQUknec=; b=lnpeNSLe2TrQdLRGQbYderK/00rEeCch+Hl7wGwFHgWMOO8dm4Zww5CnInSsI9ghPp pUs8hFRTHu0mRwHY8XxIjjU5oD3OLLRhzJ1gM/18RKRCRb37ZapwkdrBVc9LGZnnU65F HV/IPkSuHFbEgOUr2dNf/vwkcBb5euWRL1lcv0yK5ORaMEohCpebOxpQXHiXYLJYXDqb s4D676TE6Jxqg7yZhvS5GyFvcTKfcsmoDN09NWQzPjUj8yQQOEniQqbLwz4dymBv/8uj GDRmWjXjgEd1FOKl2N9TFITBf6mBIGaAUGJiN9PPl7pvOrBfsOHAEn1jFraJLEIEtaXq MSig== X-Forwarded-Encrypted: i=1; AKwUvBxxM6Zs/klRUit0j12SZxNpCzozpqRTukU4FyK71iNF3Nfr7PT8sVm+NMSML02sCa/W+5vKZVEP8g==@kvack.org X-Gm-Message-State: AFq9FYKnMJtwSs/vPgkcohaFAEG1uxj62q3JV3yY6BT3Oabdn2ac2Ftr K+udZGujecRgLPjEbV6YB8O+CrEV1P2cFh3mI0tmYMMR7jookbQBa4Lc X-Gm-Gg: AYBFou3VvCVeQ6+KJhfaFuuuwA+IqdGUkD1f0NKvh13U9MwB2M220vTqvVkUy1VPTIl ELKCu9djGNbbNWemZrrtrLQY0zmEsI/sqhItjIOHhlP/pbh+8h/WfyFfd1ASMCqfM1OHBPgmQVE KJZjSO6J9SKzgdKbRJARjyxrvYCCQWYzkgzPE/PK92KY6sSF5q2QfT8JHKXOpSvoQTRyf/Qze0S 5UryCbORDvwQTOqYR83zPbqREUzxh5Fu62r0q5jEzH1NUzcKCZEIy8sSYvusLK4xKEIkUXjYU/n VeqlHnt+zPjz/8kzUUK9aohza46hwF3EDnJlOGDtLzZbsYGACUSRKcFVEeL3twNbsCTWhvqkeEE Bgsfuza2UTyZ/OozGmiHHNZgdyUJRJKbCK0CF5EfRc7ydSgp/AHuWoCtQXdG8cBHj/AAPSSVHI9 c4OJXOUkwn37X/sHB/jjETzbeYZeO199CjALQN+sXh635qnNmWHwS143M2pFAQZgyK5eXGYrx/s PecmLJzpwPCIWg2falywnxjwHcYCVmqCqifArPWtYAZCL3gAVxWdXqs/v7qrs84fz0ppLbZjLNL H2ktoL02rD69lL/iWDhx+p23d3Ic8ZpYbfXRJkKAPYl//93Y1OkDYD4I2NmOgo1K0/V5CdUYZeO osugTAQNWRsIjqJnG/61+8pSvdPSxjA0bizNJIMS1FBiMMNntObHdoaQOb9xx9IqE0VYquOMx8M ADE4rMDROtMBvQb0w= X-Received: by 2002:a17:907:160b:b0:c46:6a50:40b7 with SMTP id a640c23a62f3a-c46bdd690d3mr894395066b.10.1793063208643; Mon, 26 Oct 2026 18:06:48 -0700 (PDT) Received: from [192.168.100.100] (87-205-15-91.static.ip.netia.com.pl. [87.205.15.91]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c46bd4e7c94sm373434066b.27.2026.10.26.18.06.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Oct 2026 18:06:48 -0700 (PDT) Message-ID: <7c8d96bf-368d-4272-8cd1-94740a2e4a84@gmail.com> Date: Tue, 27 Oct 2026 02:06:47 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] kernfs, autofs: fix pipe lock cycles through sysfs stores To: Ian Kent , Greg Kroah-Hartman Cc: Tejun Heo , "Rafael J . Wysocki" , Danilo Krummrich , Alexander Viro , Christian Brauner , Jan Kara , Ingo Molnar , Peter Zijlstra , Andrew Morton , Jens Axboe , driver-core@lists.linux.dev, autofs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzbot+002fb7b2d0bc53bf7e75@syzkaller.appspotmail.com References: <6aa23178.f81106d8.2ab401.0006.GAE@google.com> <4f56c93a9fc5fee152364974773df0a319c84af9.camel@themaw.net> Content-Language: en-US From: Krystian Kaniewski In-Reply-To: <4f56c93a9fc5fee152364974773df0a319c84af9.camel@themaw.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 3804BA0008 X-Stat-Signature: 5ofuo87qc938m4qu8txkz6c1j48t5er4 X-Rspam-User: X-Spam-Status: No, score=-4.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1793063210-266900 X-HE-Meta: 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 KX1IXC4P 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 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 One additional detail I missed in my previous reply. I reproduced the warning on the unmodified kernel at commit: 93f51579e7df248780214094418f205253383cc5 Exact kernel version: 7.3.0-rc4-g93f51579e7df #1 I ran it under QEMU TCG using the configuration supplied by syzbot. Both the unmodified C reproducer and the original syz reproducer reported the same lockdep cycle. Thanks, Krystian