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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696498575; x=1697103375; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=miaHJCTsklS6Zbf74LdxRTHsnukEGfuauknHlldmnMc=; b=QFvdY/FyxkbAHDFTe1d61HEPBpvKjezRu16VHZ1FP1fyDKMAWt83XyBW9xdUAkDVMj ucMPRNA+c3b6g2G37Yd6WOGa0fnzrs80dP1WOPrxzb+dZ7x7zPDDWSa6yIx9joVLJ/QK i4g00/bNMTce7wD4UbcH068mTjj+CppEbfVleN9x3P+H+zshm9b2EOLRSDvOZhrVvbKF xMNcM3ZBckOF8jrS6J4qMLGqjOA298urN61hUZ5d98tb7i2iHI6Vrqb6xbh7pIw3R5q7 KiNcTC7MCaYHwdwGx4HQZ0OOsTYld6EKj/F/nd4CtRIlq/nofxCN7OUVGiCNTj5krigO Yerw== X-Gm-Message-State: AOJu0YyLqGrprqjZuIxtUDycFcIjMJ0drgO0UZTB6ivbyzVEi4eo+C3i IgxweggwkHEHPOg5r2ppndtAk2CBYx7YCtTLmSw= X-Received: by 2002:a67:f4c9:0:b0:44d:3aba:b03d with SMTP id s9-20020a67f4c9000000b0044d3abab03dmr4641256vsn.17.1696498575187; 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-Spam-Status: No, score=0.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SORTED_RECIPS,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Thu, 05 Oct 2023 09:17:10 -0700 (PDT) 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