From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f197.google.com (mail-oi1-f197.google.com [209.85.167.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 755061C2324 for ; Thu, 5 Mar 2026 18:23:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772735016; cv=none; b=MNSzHEQSDZh7B1Yp/AjnsCdKWjNKlZC0i3w5HuZNT7l2E03t9bnOih6426ji2CXDRaGEfj1AkXtAm5yV332d0RoG0lwQ9WjPE0Wp9GbjDAD+O+9FWJbzZgBk5+dt1siKdllpi/XajFwaYFAhPkcry8HBrDQOzw4/3q0gjQdjkUk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772735016; c=relaxed/simple; bh=OCip7/wXd7eybwaBon4X7GKXKUMNND0zCQq9bTYIQqs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=CpcKLbRH3zhoC4/pMRSOjDjbW04STSppO8+vNYueMmC4gRNUmokrN4UuTwrLFxIwaPKzj7he+Bh38qLMoKpyctUPOqCHenA2kFk51zMbYhDptUbTDUJzZh7I6pCXQ8QMp6RFEx3qp4i6PSdLkfHZdvchJxxnvbBkLn+UvXafI3I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f197.google.com with SMTP id 5614622812f47-463a314b114so75219253b6e.0 for ; Thu, 05 Mar 2026 10:23:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772735014; x=1773339814; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=8O7RDofQKy3AbszOHr79CkOMt4ZCcu+WsAS0omFrwRQ=; b=hs2TVCVTyooDmj1UY34cuAxdDpAEiEq68EqOtdVhTvfZRFKt2QxuaDfRK4WEqwTfd2 KaKtorwCGhp3Ezu+/rwGx0si4CrTDYDfcAyh2bJ8vYhvdsdGdiyjAoi/cZsUpodo/bYg uTU25JDD2W7U9EEVgsjkZf5cB3P5ojHI14P4C/3VJzb6ALCJk+38rN6Okoi3Fk8+4grm U5AKzHdMY0M6Rl7anPDHUgK0HNssfF82VAiJ+pL0M0jOW9A60sd/qWFEcoiAw7m0L/xH 8f4MesxgdI+v/BXl+u4g+NTo7uMJ2ICHjb9h1H+bVkmYLP93kI+LiF63FPKtdKPFWmpc oWQg== X-Forwarded-Encrypted: i=1; AJvYcCUXVvwTmPm1taPHd9c/DSpAoUxe/mN28ZsAOYw+936NEDn9Ksvhc0Spo9IqREwAxI806bFlL7wi8Xf7l0A=@vger.kernel.org X-Gm-Message-State: AOJu0YxrqbINACrSHxZPbNi68rD/bSPq/xq2QdN1oDfJTeyVQbjnoweR AgVx2Z/ZImGxlZJkjMQ8qLFb8WEHrAl6zMwYeCIRj8SbK8npp2Ko+YGFxqY2cAHnOMKIIrD+fKw uuj45DLthO5DHnIgxYQkW114jH6puXyuxPXFWHRdBCzb0Xisv3PHc5jDtOy0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:818b:b0:679:e70d:fb81 with SMTP id 006d021491bc7-67b99c56d90mr457459eaf.20.1772735014472; Thu, 05 Mar 2026 10:23:34 -0800 (PST) Date: Thu, 05 Mar 2026 10:23:34 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a9ca26.a70a0220.305d9a.0000.GAE@google.com> Subject: [syzbot] [f2fs?] KMSAN: uninit-value in f2fs_sanity_check_node_footer From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: eb71ab2bf722 Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11c430ba580000 kernel config: https://syzkaller.appspot.com/x/.config?x=10f867da86e38691 dashboard link: https://syzkaller.appspot.com/bug?extid=9aac813cdc456cdd49f8 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fcbe8b5437ef/disk-eb71ab2b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/245a6565a05b/vmlinux-eb71ab2b.xz kernel image: https://storage.googleapis.com/syzbot-assets/a83b065baa80/bzImage-eb71ab2b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9aac813cdc456cdd49f8@syzkaller.appspotmail.com syz.2.464: attempt to access beyond end of device loop2: rw=0, sector=126984, nr_sectors = 8 limit=32735 ===================================================== BUG: KMSAN: uninit-value in f2fs_sanity_check_node_footer+0x374/0xa20 fs/f2fs/node.c:1520 f2fs_sanity_check_node_footer+0x374/0xa20 fs/f2fs/node.c:1520 f2fs_finish_read_bio+0xe1e/0x1d60 fs/f2fs/data.c:177 f2fs_read_end_io+0x6ab/0x2220 fs/f2fs/data.c:-1 bio_endio+0x1006/0x1160 block/bio.c:1792 submit_bio_noacct+0x533/0x2960 block/blk-core.c:891 submit_bio+0x57a/0x620 block/blk-core.c:926 blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline] f2fs_submit_read_bio+0x12c/0x360 fs/f2fs/data.c:557 f2fs_submit_page_bio+0xee2/0x1450 fs/f2fs/data.c:775 read_node_folio+0x384/0x4b0 fs/f2fs/node.c:1481 __get_node_folio+0x5db/0x15d0 fs/f2fs/node.c:1576 f2fs_get_inode_folio+0x40/0x50 fs/f2fs/node.c:1623 do_read_inode fs/f2fs/inode.c:425 [inline] f2fs_iget+0x1209/0x9380 fs/f2fs/inode.c:596 f2fs_fill_super+0x8f5a/0xb2e0 fs/f2fs/super.c:5184 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694 get_tree_bdev+0x38/0x50 fs/super.c:1717 f2fs_get_tree+0x35/0x40 fs/f2fs/super.c:5436 vfs_get_tree+0xb3/0x5d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x885/0x1dd0 fs/namespace.c:3839 path_mount+0x7a2/0x20b0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x704/0x7f0 fs/namespace.c:4338 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4338 x64_sys_call+0x39f0/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_frozen_pages_noprof+0x6f7/0x1020 mm/page_alloc.c:5273 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2484 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline] alloc_pages_noprof mm/mempolicy.c:2575 [inline] folio_alloc_noprof+0x108/0x360 mm/mempolicy.c:2585 filemap_alloc_folio_noprof+0xd9/0x480 mm/filemap.c:1013 __filemap_get_folio_mpol+0xb43/0x1960 mm/filemap.c:2006 __filemap_get_folio include/linux/pagemap.h:774 [inline] filemap_grab_folio include/linux/pagemap.h:854 [inline] f2fs_grab_cache_folio fs/f2fs/f2fs.h:3048 [inline] __get_node_folio+0x56d/0x15d0 fs/f2fs/node.c:1572 f2fs_get_inode_folio+0x40/0x50 fs/f2fs/node.c:1623 do_read_inode fs/f2fs/inode.c:425 [inline] f2fs_iget+0x1209/0x9380 fs/f2fs/inode.c:596 f2fs_fill_super+0x8f5a/0xb2e0 fs/f2fs/super.c:5184 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694 get_tree_bdev+0x38/0x50 fs/super.c:1717 f2fs_get_tree+0x35/0x40 fs/f2fs/super.c:5436 vfs_get_tree+0xb3/0x5d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x885/0x1dd0 fs/namespace.c:3839 path_mount+0x7a2/0x20b0 fs/namespace.c:4159 do_mount fs/namespace.c:4172 [inline] __do_sys_mount fs/namespace.c:4361 [inline] __se_sys_mount+0x704/0x7f0 fs/namespace.c:4338 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4338 x64_sys_call+0x39f0/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 8292 Comm: syz.2.464 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup