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AO0yUKVSR6P2MCL8sceUsVBMC0gWPFMZhdK3K3NT2CA7U7knzPhuL2eO WzRobKd+lw+H5YPHhH/azLOeOkOqH+4AsNCV7FCwfuRMWRMd X-Google-Smtp-Source: AK7set+iRDLZndKt+NiHRFKoauDMyx0XwSkRPRZmpyLZhRpNE7W6pcCPFmpYpBL07M+ziznBxUqQcz41AULLCr7KjuYbxaRfNq1b MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3499:b0:315:9774:deec with SMTP id bp25-20020a056e02349900b003159774deecmr5129526ilb.0.1677227570720; Fri, 24 Feb 2023 00:32:50 -0800 (PST) Date: Fri, 24 Feb 2023 00:32:50 -0800 In-Reply-To: <0000000000007dcc0b05e91943c2@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008f74e905f56df987@google.com> Subject: Re: [syzbot] [fs?] [mm?] KMSAN: uninit-value in ondemand_readahead From: syzbot To: akpm@linux-foundation.org, glider@google.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 84A371A0005 X-Stat-Signature: dfogjbqak97zif47wr17pg1g4et8e5bk X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1677227571-435255 X-HE-Meta: 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 VSWCALQO 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 MfMLgnFm dYBBFWtJoQsdC6mw6mgLxcZi0cItbOgvpWCwBdp4FiXFjatXE0g71EpAU+mouCUrQDh+O0JFq+IUvJRaE1xIki7oBNP3GFnw0L89ozuwOHDjgneRwytKIkCxsCkeTj9ejwok+0w0QuHsThRNYnfJ3fLPeU3Vl2BJHGSR8ZddaAqtALsjCko74HDWXI/QgkSmbNB+ZXzByiM2Kfy7MiVmGAOWOSb6bMr41HPD4XmezaXXUdy54SAUXg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: syzbot has found a reproducer for the following issue on: HEAD commit: 97e36f4aa06f Revert "sched/core: kmsan: do not instrument .. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=10e46944c80000 kernel config: https://syzkaller.appspot.com/x/.config?x=46c642641b9ef616 dashboard link: https://syzkaller.appspot.com/bug?extid=8ce7f8308d91e6b8bbe2 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143b8650c80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a22f2cc80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9931a9627dc6/disk-97e36f4a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1aafdb2fd6dc/vmlinux-97e36f4a.xz kernel image: https://storage.googleapis.com/syzbot-assets/90df5872c7ff/bzImage-97e36f4a.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/ea75a01297dd/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8ce7f8308d91e6b8bbe2@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 16 ===================================================== BUG: KMSAN: uninit-value in ondemand_readahead+0xddf/0x1720 mm/readahead.c:596 ondemand_readahead+0xddf/0x1720 mm/readahead.c:596 page_cache_sync_ra+0x72b/0x760 mm/readahead.c:709 page_cache_sync_readahead include/linux/pagemap.h:1210 [inline] cramfs_blkdev_read fs/cramfs/inode.c:217 [inline] cramfs_read+0x611/0x1280 fs/cramfs/inode.c:278 cramfs_lookup+0x1b8/0x870 fs/cramfs/inode.c:767 __lookup_slow+0x528/0x730 fs/namei.c:1685 lookup_slow+0x6a/0xc0 fs/namei.c:1702 walk_component fs/namei.c:1993 [inline] link_path_walk+0xe9a/0x1620 fs/namei.c:2320 path_openat+0x333/0x5750 fs/namei.c:3710 do_filp_open+0x24d/0x660 fs/namei.c:3741 do_sys_openat2+0x1f0/0x910 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_compat_sys_openat fs/open.c:1386 [inline] __se_compat_sys_openat fs/open.c:1384 [inline] __ia32_compat_sys_openat+0x2ab/0x330 fs/open.c:1384 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Local variable ra.i created at: cramfs_blkdev_read fs/cramfs/inode.c:186 [inline] cramfs_read+0xc0/0x1280 fs/cramfs/inode.c:278 cramfs_lookup+0x1b8/0x870 fs/cramfs/inode.c:767 CPU: 1 PID: 5017 Comm: syz-executor948 Not tainted 6.2.0-syzkaller-81152-g97e36f4aa06f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 =====================================================