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 2FC7F606F3D0 for ; Mon, 2 Nov 2026 14:41:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2F0E76B05B7; Mon, 2 Nov 2026 09:41:11 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 2C8066B05B9; Mon, 2 Nov 2026 09:41:11 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 205246B05BA; Mon, 2 Nov 2026 09:41:11 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id F120F6B05B7 for ; Mon, 2 Nov 2026 09:41:10 -0500 (EST) Received: from smtpin17.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 8ECAA120150 for ; Mon, 2 Nov 2026 14:41:10 +0000 (UTC) X-FDA: 85390441500.17.1D58868 Received: from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc [91.216.245.30]) by imf23.hostedemail.com (Postfix) with ESMTP id 757E2140009 for ; Mon, 2 Nov 2026 14:41:08 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; spf=pass (imf23.hostedemail.com: domain of fw@strlen.de designates 91.216.245.30 as permitted sender) smtp.mailfrom=fw@strlen.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1793630469; 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: in-reply-to:in-reply-to:references:references; bh=OMjVTvjZtZrTjrcI72ExCzD1i9afB7DwzHLxEXPZD7Y=; b=Olp4hyuqJXTNQBdMN6EP3KqqxeoiTm0fZ6bWtobC/YBfc2cGGPc6rKafgIPm4uWSMFkcTq 3oY74srK/INb6HN8UEGdnVc0uW1I3i0agEMdLYKxFon1zU+6JM94zGBGK+zA+DgS2QdW6+ 9MwPdMBpiU1Xs5f2JJCc+2StQq6LjwU= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf23.hostedemail.com: domain of fw@strlen.de designates 91.216.245.30 as permitted sender) smtp.mailfrom=fw@strlen.de ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1793630469; b=sHZ3K/ADuMc/KrSyE96yXaewRX4b8voUjTHZ0zJDQ3TvExYE//28N2cuwfRWld8jXtHAkv 1TXwhL1LoYNnwY99dQ7RQvcYFvo7FTVpF5cC8Yq9aeT0pchtzl30xu+AlzQVTrBya6h1Hk UWkQgqsz3+E8+57mIzKTr7/R1Oct7is= Received: by Chamillionaire.breakpoint.cc (Postfix, from userid 1003) id B65DD60342; Mon, 02 Nov 2026 15:41:04 +0100 (CET) Date: Mon, 2 Nov 2026 15:41:03 +0100 From: Florian Westphal To: Christian Brauner Cc: linux-fsdevel@vger.kernel.org, Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, Chuck Lever , stable@vger.kernel.org Subject: Re: [PATCH RFC 03/38] netfilter: xt_recent: don't remove the proc entries under a spinlock Message-ID: References: <20261102-work-procfs-bugfixes-v1-0-59422ed3e465@kernel.org> <20261102-work-procfs-bugfixes-v1-3-59422ed3e465@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261102-work-procfs-bugfixes-v1-3-59422ed3e465@kernel.org> X-Rspamd-Queue-Id: 757E2140009 X-Stat-Signature: hmcthy81ahhc73ztwzrnfxan14gwwctd X-Rspamd-Server: rspam04 X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1793630468-394366 X-HE-Meta: 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 snZvxqYK I7sBH6da+AgivgZSRls4Th+RHvbdez0CcrwynLiRo9/fnZ2O81f/ji8zefj+lPpVhXcFU3BrnXDvNZfj2luAYzEZzYwQ2pLq+39E910sauDcLidRP69aNnIZ0zWcUGxT7K/kWDXWHGqdefiKXIWVgtLp+jW3rJozx9xGifn1S7gkPGAI= 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 Christian Brauner wrote: > recent_proc_net_exit() removes the proc entries of all tables with > recent_lock held. remove_proc_entry() waits until nobody calls into the > entry anymore, and reading one of them takes recent_lock in > recent_seq_start() while procfs has the entry pinned. So when a reader > gets there while the network namespace goes away, the exit path sleeps > with a spinlock held and bh disabled, waiting for a reader that spins > on that very lock: Yes, but note that this change is already part of a pending nf -> net merge request.