From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D1EC081732; Thu, 20 Aug 2026 00:14:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787184852; cv=none; b=rQV4u2jEIl2xGOKUpXCUAHu+vHKg8bQtQdRNx6YtrdncfDQmzvk+N2LTyuR2o+Bi2qTceiIuFhvkOC5wDSquiCDwe2P6RriwdAVggBZ+rxm0MMuLrGwOzHcjFhLYXERq0M9mUk7Bbw2zsrI60WkzC4T3HFn/uTeG3elcSeXo7T8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787184852; c=relaxed/simple; bh=BwedfqMG2k0VErJWeElnhcQBn47fV0WmcYDpJ9LOkes=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=I6tCgRg0iVctu4eezHVcR0+tifF74W/uQ4inseiHsWSJtVxxe08hS9IKVqP/L6T91p0SNAPpUtU3IwnhBJD6mQGnmJd0LlXryKgVZ5yPZWfW5Xy9+Z7r5U8cu8iyDYvzISQl2ymHWEK1Q6zRgubJCuhpGntdllVq6TUkwlFY+A4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=EAoVIDTO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="EAoVIDTO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA50E1F000E9; Thu, 20 Aug 2026 00:14:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787184850; bh=SWVI+GSgGh4hCFWcmCgPPS+9GFpBgLS6j7HiovZ615g=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=EAoVIDTONQzi2xvcOtoxAwsf3kxavm7K1DtkD/TId6smnEXdeGJRiaEKmYhcAdEX1 YPIGg3QZAOrOAOjxv+cIcer8vp94/C4tt9up2hpGMbxdyBFynvvfQ49Cwu/iz9Cz+o c4N/73GK3ha8P0XL/A9qejq6JsdZ8W9p4LYj1qXM= Date: Wed, 19 Aug 2026 17:14:09 -0700 From: Andrew Morton To: syzbot Cc: apopple@nvidia.com, byungchul@sk.com, david@kernel.org, gfs2@lists.linux.dev, gourry@gourry.net, joshua.hahnjy@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, matthew.brost@intel.com, rakie.kim@sk.com, syzkaller-bugs@googlegroups.com, ying.huang@linux.alibaba.com, ziy@nvidia.com Subject: Re: [syzbot] [mm?] [gfs2?] WARNING in read_rindex_entry Message-Id: <20260819171409.e30eed94c3f7eb44b38e5ec7@linux-foundation.org> In-Reply-To: <6a863306.ae6ddae5.3da009.0013.GAE@google.com> References: <6a863306.ae6ddae5.3da009.0013.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 19 Aug 2026 15:49:42 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 15ef2f78c49d Merge tag 'input-for-v7.2-rc7' of git://git.k.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=10871279580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a0fdc3b566746377 > dashboard link: https://syzkaller.appspot.com/bug?extid=9d20c3ad7d29227de28d > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14871279580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100d2a25580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/c2a8c7d3a889/disk-15ef2f78.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/2da78afed345/vmlinux-15ef2f78.xz > kernel image: https://storage.googleapis.com/syzbot-assets/c4ffd97e4708/bzImage-15ef2f78.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/eaa4120812b6/mount_0.gz > fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=17f52a25580000) > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+9d20c3ad7d29227de28d@syzkaller.appspotmail.com Thanks. Mounting an intentionally corrupted fs image, I assume. It appears that GFS2 forgot to validate the `ri_length' which it read from disk. That gets used in compute_bitstructs()->kzalloc_objs() and the memory allocator didn't like the excessively-sized allocation attempt. > gfs2: fsid=.: Now mounting FS (format 1801)... > gfs2: fsid=..0: journal 0 mapped with 18 extents in 0ms > gfs2: fsid=..0: first mount done, others may mount > ------------[ cut here ]------------ > 1 > WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x2427/0x2dc0 mm/page_alloc.c:5280, CPU#1: syz-executor256/5629 > Modules linked in: > CPU: 1 UID: 0 PID: 5629 Comm: syz-executor256 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 > RIP: 0010:__alloc_frozen_pages_noprof+0x2427/0x2dc0 mm/page_alloc.c:5280 > Code: e9 8d fb ff ff 31 d2 be 28 12 00 00 48 c7 c7 a0 64 e1 8b e8 5b 8c 69 ff 2e 2e 2e 31 c0 e9 02 ed ff ff c6 05 54 c1 9d 0e 01 90 <0f> 0b 90 e9 6f df ff ff 48 c7 c7 80 ae d3 8e 45 89 f7 44 8b 74 24 > RSP: 0018:ffffc9000345f0e0 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 1ffff9200068be36 RDI: 0000000000040d40 > RBP: 000000000000000b R08: 0000000000000005 R09: 0000000000000009 > R10: 000000000000000b R11: 0000000000000000 R12: 0000000000040d40 > R13: 1ffff9200068be74 R14: ffffffff9b759444 R15: 0000000000000001 > FS: 000055556d263400(0000) GS:ffff888123ee1000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055886dbe9978 CR3: 000000003394d000 CR4: 0000000000350ef0 > Call Trace: > > alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490 > ___kmalloc_large_node+0xe5/0x120 mm/slub.c:5274 > __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5305 > __do_kmalloc_node mm/slub.c:5322 [inline] > __kmalloc_noprof+0x5a1/0x820 mm/slub.c:5359 > _kmalloc_noprof include/linux/slab.h:992 [inline] > _kzalloc_noprof include/linux/slab.h:1309 [inline] > compute_bitstructs fs/gfs2/rgrp.c:766 [inline] > read_rindex_entry+0x4a1/0x1250 fs/gfs2/rgrp.c:931 > gfs2_ri_update+0x6f/0x3b0 fs/gfs2/rgrp.c:1001 > gfs2_rindex_update+0x40b/0x480 fs/gfs2/rgrp.c:1051 > init_inodes+0x1f78/0x2790 fs/gfs2/ops_fstype.c:872 > gfs2_fill_super+0x1d3d/0x2cf0 fs/gfs2/ops_fstype.c:1250 > get_tree_bdev_flags+0x38c/0x620 fs/super.c:1640 > gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332 > vfs_get_tree+0x92/0x320 fs/super.c:1700 > fc_mount fs/namespace.c:1198 [inline] > do_new_mount_fc fs/namespace.c:3765 [inline] > do_new_mount fs/namespace.c:3841 [inline] > path_mount+0x7d0/0x23d0 fs/namespace.c:4161 > do_mount fs/namespace.c:4174 [inline] > __do_sys_mount fs/namespace.c:4390 [inline] > __se_sys_mount fs/namespace.c:4367 [inline] > __x64_sys_mount+0x293/0x310 fs/namespace.c:4367 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7ff9e8de99ea > Code: 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 a4 30 0a 00 00 00 00 00 eb 96 e8 51 05 00 00 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffc770eecc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00007ffc770eece0 RCX: 00007ff9e8de99ea > RDX: 0000200000000040 RSI: 0000200000000100 RDI: 00007ffc770eece0 > RBP: 0000200000000100 R08: 00007ffc770eed20 R09: 0000000000000000 > R10: 0000000000008cd3 R11: 0000000000000246 R12: 0000200000000040 > R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffc770eed20 > > > > --- > 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 syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > 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