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Thu, 22 Jul 2021 13:50:09 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D3B6B11C04A; Thu, 22 Jul 2021 13:50:07 +0000 (GMT) Received: from sig-9-65-201-143.ibm.com (unknown [9.65.201.143]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 22 Jul 2021 13:50:07 +0000 (GMT) Message-ID: Subject: Re: [syzbot] possible deadlock in mnt_want_write (2) From: Mimi Zohar To: Miklos Szeredi , syzbot , Hillf Danton Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs , Al Viro , linux-integrity Date: Thu, 22 Jul 2021 09:50:06 -0400 In-Reply-To: References: <00000000000067d24205c4d0e599@google.com> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.28.5 (3.28.5-16.el8) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: jNI6zunxBaehC_v-7eAEcm_fNZPdIjc1 X-Proofpoint-ORIG-GUID: v1AYLtooOcVymVRZmDtX_OfRce_DyXX7 Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-22_07:2021-07-22,2021-07-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 clxscore=1011 mlxlogscore=930 mlxscore=0 spamscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 adultscore=0 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107220091 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [CC'ing Hillf Danton ] Hi Miklos, On Mon, 2021-07-19 at 17:11 +0200, Miklos Szeredi wrote: > [CC: linux-intergrity] > > On Tue, 15 Jun 2021 at 18:59, syzbot > wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 06af8679 coredump: Limit what can interrupt coredumps > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=162f99afd00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=547a5e42ca601229 > > dashboard link: https://syzkaller.appspot.com/bug?extid=b42fe626038981fb7bfa > > compiler: Debian clang version 11.0.1-2 > > > > Unfortunately, I don't have any reproducer for this issue yet. There was a similar syzbot report and followup discussion [1]. According to Amir Goldstein, it's a false positive lockdep warning. At this point we understand how to fix the problem, but are waiting for a reproducer. thanks, Mimi [1] Message-Id: <20210616090142.734-1-hdanton@sina.com> > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+b42fe626038981fb7bfa@syzkaller.appspotmail.com