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[86.30.250.44]) by smtp.googlemail.com with ESMTPSA id u129sm6073283wmb.12.2019.08.16.01.55.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Aug 2019 01:55:50 -0700 (PDT) Subject: Re: INFO: rcu detected stall in __do_softirq To: syzbot , alsa-devel@alsa-project.org, bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, nstange@suse.de, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkoul@kernel.org, x86@kernel.org, yakui.zhao@intel.com References: <000000000000b4126c059030cfb6@google.com> From: Srinivas Kandagatla Message-ID: <63c0dc1e-323d-d46e-2d4a-b5b6d6916042@linaro.org> Date: Fri, 16 Aug 2019 09:55:49 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <000000000000b4126c059030cfb6@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 16/08/2019 01:10, syzbot wrote: > syzbot has bisected this bug to: > > commit 2aeac95d1a4cc85aae57ab842d5c3340df0f817f > Author: Srinivas Kandagatla > Date:   Tue Jun 11 10:40:41 2019 +0000 > >     soundwire: add module_sdw_driver helper macro Not sure how adding a macro with no users triggers this rcu stall. BTW this was in mainline since rc1. --srini > > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=114b45ee600000 > start commit:   882e8691 Add linux-next specific files for 20190801 > git tree:       linux-next > final crash:    https://syzkaller.appspot.com/x/report.txt?x=134b45ee600000 > console output: https://syzkaller.appspot.com/x/log.txt?x=154b45ee600000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=466b331af3f34e94 > dashboard link: > https://syzkaller.appspot.com/bug?extid=6593c6b8c8b66a07cd98 > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16b216b2600000 > > Reported-by: syzbot+6593c6b8c8b66a07cd98@syzkaller.appspotmail.com > Fixes: 2aeac95d1a4c ("soundwire: add module_sdw_driver helper macro") > > For information about bisection process see: > https://goo.gl/tpsmEJ#bisection