From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CCA7367282 for ; Thu, 21 May 2026 02:20:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779330025; cv=none; b=Lzp8Yg6OGbw/aNc41+Qws510TWAquWhdo1hkzmlfauHdAri9Rri4WYI365fiIEkXDnVQIHRa9ZClxQVbck9t7DfyYu/Em6vDGshDJbcCXXM1hU5NBa5n9k6wS3rGDaJHqDWeKkW9GvzNzcbCemgh6zVUE9844zolkTk8Pqc93Cc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779330025; c=relaxed/simple; bh=z3sH30KG6eD/dCmA/2ZxQ9DZidHPWQ6ib3wLWvjxgks=; h=Content-Type:MIME-Version:Subject:From:Message-Id:Date:References: In-Reply-To:To:Cc; b=L/M2dWVTV72QB80wo4ikoD8yiZrW4wRk24q6Q1K9f6fEvTidOx+IyGw7En9gPt2qgCDO051A+8zUQ3mLQfUojaPBIK5Ca2rpgGkt9Zq95i1M/Pcp77TfVGkXYm70CmMFzSpEXh8zpheV+1fnhp/3nxmUUtilUEjM9qaw/OwTS6s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=C286ktbC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="C286ktbC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A77E21F00A3E; Thu, 21 May 2026 02:20:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779330017; bh=BGRI5Ro+56q0pCye1gtru3pqshQmgqKpfgkWeXPNvjE=; h=Subject:From:Date:References:In-Reply-To:To:Cc; b=C286ktbCtXIj0PJcldrVg/I/tJtsXDffPaDbcGYZFOV1ls+Kh7fERLwUHAycS7TAN yDILRPEe4mAi6/PMf0/mb3eMrVBO+vauW+sXy3ofRt9wpno3NSFEJ5CaX6+4reZnxZ s8zD9gB5wH0r72thIeZjo7CWma3f7KwcB0EwZG9vwxNQRU8jt3K7aBu3raMe5P7wqs LypOlXBtN6Fb5xpsz1h2FoPbYeLB7iuxm6MyhGk1W0L6szDH3NqkM5iON93svnPCsn GMov/+hfOIEsMxSKvzluT//f775Cle0/XJ8bogXA1sKJPTvtRSxval6eZx8UpjnEnJ ltIC5R48nx86g== Received: from [10.30.226.235] (localhost [IPv6:::1]) by aws-us-west-2-korg-oddjob-rhel9-1.codeaurora.org (Postfix) with ESMTP id 1976A3930C38; Thu, 21 May 2026 02:20:29 +0000 (UTC) Content-Type: text/plain; charset="utf-8" Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH net-next] net: bridge: remove stale rcu_barrier() in br_multicast_dev_del() From: patchwork-bot+netdevbpf@kernel.org Message-Id: <177933002764.3834961.11698606086995974842.git-patchwork-notify@kernel.org> Date: Thu, 21 May 2026 02:20:27 +0000 References: <20260519095540.2643318-1-edumazet@google.com> In-Reply-To: <20260519095540.2643318-1-edumazet@google.com> To: Eric Dumazet Cc: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, netdev@vger.kernel.org, eric.dumazet@gmail.com, razor@blackwall.org, idosch@nvidia.com Hello: This patch was applied to netdev/net-next.git (main) by Jakub Kicinski : On Tue, 19 May 2026 09:55:40 +0000 you wrote: > This rcu_barrier() came from a time call_rcu() calls were used in > net/bridge/br_multicast.c. > > Now kfree_rcu() is there, we can remove this problematic rcu_barrier() > which causes extreme RTNL pressure in many syzbot reports. > > INFO: task syz-executor:77945 is blocked on a mutex likely owned by task kworker/u1024:5:36537. > task:kworker/u1024:5 state:D stack:24616 pid:36537 tgid:36537 ppid:2 task_flags:0x4208060 flags:0x00080000 last_sleep:612797637337 > Workqueue: netns cleanup_net > Call Trace: > > [] context_switch+0xf2a/0x1730 kernel/sched/core.c:6483 > [] __schedule+0x1133/0x43a0 kernel/sched/core.c:8411 > [] __schedule_loop kernel/sched/core.c:8514 [inline] > [] schedule+0xab/0x260 kernel/sched/core.c:8529 > [] schedule_timeout+0xc3/0x2b0 kernel/time/sleep_timeout.c:75 > [] do_wait_for_common kernel/sched/completion.c:100 [inline] > [] __wait_for_common kernel/sched/completion.c:121 [inline] > [] wait_for_common kernel/sched/completion.c:132 [inline] > [] wait_for_completion+0x2c7/0x5d0 kernel/sched/completion.c:153 > [] rcu_barrier+0x49f/0x620 kernel/rcu/tree.c:3888 > [] br_multicast_dev_del+0x303/0x350 net/bridge/br_multicast.c:4459 > [] br_dev_uninit+0x1c/0x40 net/bridge/br_device.c:157 > [] unregister_netdevice_many_notify+0x1c1c/0x2300 net/core/dev.c:12599 > [] ops_exit_rtnl_list net/core/net_namespace.c:187 [inline] > [] ops_undo_list+0x3d3/0x940 net/core/net_namespace.c:248 > > [...] Here is the summary with links: - [net-next] net: bridge: remove stale rcu_barrier() in br_multicast_dev_del() https://git.kernel.org/netdev/net-next/c/25ae123db10b You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html