From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 117E5C61DA3 for ; Fri, 24 Feb 2023 08:32:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229773AbjBXIc5 (ORCPT ); Fri, 24 Feb 2023 03:32:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229768AbjBXIcw (ORCPT ); Fri, 24 Feb 2023 03:32:52 -0500 Received: from mail-io1-f80.google.com (mail-io1-f80.google.com [209.85.166.80]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DD3940D2 for ; Fri, 24 Feb 2023 00:32:51 -0800 (PST) Received: by mail-io1-f80.google.com with SMTP id v10-20020a056602058a00b007076e06ba3dso7895812iox.20 for ; Fri, 24 Feb 2023 00:32:51 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=zGz0xI/eOTrHpwY7e1zbCubux+0rGm5ClbH4DOLUgSc=; b=eKoc+tVdUKTwdYe0l3sx005PxFJLAP9QpBXBZnCFz+NhixdQwdMxXJMV0d83nMKRZP jv3OMyF0JFsmV8TvocyQgO3ENhsoBXx5EZof00/f4gSOfSLrci1hu6SztMKBoxxEDlaG XM2YL4muvecBmQqIhgRzzlJF0FbkdZaDxraXmkpQ9KuweBIJ2P1C83PFSD5fLdYLqcpp Gza9499UcGBmtRRhAkMaJDlfEfl/piGStb0TuwEVESqCHNC48h3JGz299nFC9g67RqjO pn9GurswxRUyMxQnufptDKOM38iUbtwZ8rpbgIKinriiA4NCjPm1QkcdABCfmnnI9nvj ANDQ== X-Gm-Message-State: AO0yUKVhgshr1Hz4OW9o0yIlHMc4g2Mt8ELaa8Ykmdpciae1J2BLvjEl j5b0s3T2CFUP+M+UWs9sjJH7LiFuzBW1EskCCA3lb2lCZAMt 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" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 =====================================================