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[23.128.96.18]) by mx.google.com with ESMTP id f26si1731094edx.455.2020.09.09.08.56.00; Wed, 09 Sep 2020 08:56:25 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b="IJNX8/5f"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730560AbgIIPzB (ORCPT + 99 others); Wed, 9 Sep 2020 11:55:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:52526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730431AbgIIPwH (ORCPT ); Wed, 9 Sep 2020 11:52:07 -0400 Received: from kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com (unknown [163.114.132.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4003E20639; Wed, 9 Sep 2020 15:52:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599666725; bh=VzOm3hbHGC38QpPnhgXXm5Exmh3fq0wV/ZdUr9+5gwk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=IJNX8/5fZjHHkVRxVgRvSGV5uqM4kzI2NYrjXr8Ptyg5Z/iTi9mf/UQTcq382G1mJ Tl+NCFKfrdmbL9vcvP6Y/NMwCBfgH2n8M0NqAEBKg/51xjdNOSairGIba3K8aD5aSB tGVeua677ZoeNPrC/GdItDe3IsGnG1S02StSSx5E= Date: Wed, 9 Sep 2020 08:52:03 -0700 From: Jakub Kicinski To: syzbot Cc: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vinicius.gomes@intel.com, xiyou.wangcong@gmail.com Subject: Re: INFO: rcu detected stall in cleanup_net (4) Message-ID: <20200909085203.5e335c61@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> In-Reply-To: <000000000000db78de05aedabb5a@google.com> References: <000000000000db78de05aedabb5a@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 08 Sep 2020 22:29:21 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 59126901 Merge tag 'perf-tools-fixes-for-v5.9-2020-09-03' .. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12edb935900000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3c5f6ce8d5b68299 > dashboard link: https://syzkaller.appspot.com/bug?extid=8267241609ae8c23b248 > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=157c7aa5900000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13c92ef9900000 > > The issue was bisected to: > > commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 > Author: Vinicius Costa Gomes > Date: Sat Sep 29 00:59:43 2018 +0000 > > tc: Add support for configuring the taprio scheduler Vinicius, could you please take a look at all the syzbot reports which point to your commit? I know syzbot bisection is not super reliable, but at least 3 reports point to your commit now, so something's probably going on.