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Thu, 05 Oct 2023 02:36:15 -0700 (PDT) MIME-Version: 1.0 References: <00000000000067d24205c4d0e599@google.com> <000000000000accfd30606e6bcd0@google.com> In-Reply-To: <000000000000accfd30606e6bcd0@google.com> From: Amir Goldstein Date: Thu, 5 Oct 2023 12:36:04 +0300 Message-ID: Subject: Re: [syzbot] [integrity] [overlayfs] possible deadlock in mnt_want_write (2) To: syzbot Cc: hdanton@sina.com, linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-unionfs@vger.kernel.org, miklos@szeredi.hu, mszeredi@redhat.com, syzbot@syzkalhler.appspotmail.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, zohar@linux.ibm.com, zohar@us.ibm.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: q957aef7gk5g9e65b91e8zufib9kyxfx X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 3FBCB100006 X-Rspam-User: X-HE-Tag: 1696498576-226945 X-HE-Meta: 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 w5FzQ9E0 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Oct 4, 2023 at 7:45=E2=80=AFPM syzbot wrote: > > syzbot has bisected this issue to: > > commit 708fa01597fa002599756bf56a96d0de1677375c > Author: Miklos Szeredi > Date: Mon Apr 12 10:00:37 2021 +0000 > > ovl: allow upperdir inside lowerdir > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D17ad11b268= 0000 > start commit: 3aba70aed91f Merge tag 'gpio-fixes-for-v6.6-rc3' of git:/= /.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=3D146d11b268= 0000 > console output: https://syzkaller.appspot.com/x/log.txt?x=3D106d11b268000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3De4ca82a1bedd3= 7e4 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Db42fe626038981f= b7bfa > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D1304fba6680= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D13cec0dc68000= 0 > > Reported-by: syzbot+b42fe626038981fb7bfa@syzkaller.appspotmail.com > Fixes: 708fa01597fa ("ovl: allow upperdir inside lowerdir") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisect= ion #syz test: https://github.com/amir73il/linux ima-ovl-fix