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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 1 Apr 2019 20:24:10 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x31JO9Nf25493746 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Apr 2019 19:24:10 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C5FA8B2065; Mon, 1 Apr 2019 19:24:09 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A824BB205F; Mon, 1 Apr 2019 19:24:09 +0000 (GMT) Received: from paulmck-ThinkPad-W541 (unknown [9.70.82.188]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 1 Apr 2019 19:24:09 +0000 (GMT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id 0A8B816C34EA; Mon, 1 Apr 2019 12:24:14 -0700 (PDT) Date: Mon, 1 Apr 2019 12:24:14 -0700 From: "Paul E. McKenney" To: syzbot Cc: alsa-devel-bounces@alsa-project.org, alsa-devel@alsa-project.org, colin.king@canonical.com, linux-kernel@vger.kernel.org, mingo@redhat.com, perex@perex.cz, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com, tiwai@suse.com Subject: Re: WARNING in port_delete Reply-To: paulmck@linux.ibm.com References: <0000000000004f7eb00570be9f92@google.com> <0000000000002402ed05857361e0@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000002402ed05857361e0@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 19040119-0060-0000-0000-000003270FDE X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010856; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000283; SDB=6.01182908; UDB=6.00619249; IPR=6.00963650; MB=3.00026248; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-01 19:24:13 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040119-0061-0000-0000-000048CD54A0 Message-Id: <20190401192413.GQ4102@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-01_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904010125 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 01, 2019 at 12:58:01AM -0700, syzbot wrote: > syzbot has bisected this bug to: > > commit 63d86a7e85f84b8ac3b2f394570965aedbb03787 > Author: Paul E. McKenney > Date: Tue May 1 20:08:46 2018 +0000 > > rcu: Convert rcu_grace_period_init tracepoint to gp_seq > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17f86d2f200000 > start commit: 091a1eaa Merge branch 'akpm' > git tree: upstream > final crash: https://syzkaller.appspot.com/x/report.txt?x=14046d2f200000 > console output: https://syzkaller.appspot.com/x/log.txt?x=10046d2f200000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb > dashboard link: https://syzkaller.appspot.com/bug?extid=e4c8abb920efa77bace9 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=102e2c91400000 > > Reported-by: syzbot+e4c8abb920efa77bace9@syzkaller.appspotmail.com > Fixes: 63d86a7e85f8 ("rcu: Convert rcu_grace_period_init tracepoint > to gp_seq") I could easily be suffering from a lack of imagination, but I am not seeing how this change to RCU's event tracing could cause this result. Especially given that CONFIG_RCU_TRACE=n in your .config. What am I missing here? Thanx, Paul > For information about bisection process see: https://goo.gl/tpsmEJ#bisection >