From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 AB34B883F for ; Tue, 14 Apr 2026 03:55:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776138936; cv=none; b=QY8wkoBIpviGxesRUmoosAV+SJZTUiFF6gi2dAiCWQifWSfBodvAIZROkoICSeumgaAW3pLnjEQc79LcjVV+iKQ+o6BfxYaZtRHvcKEd3hqNZFtmOnIwsBJflz78gBM0KJ08HcDHW1i8XMFcXZi8cmJG+3YnQahHZ/n9OBUkDx8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776138936; c=relaxed/simple; bh=1NfmtnUevl7kjE0NFq6ezd1zNesY3fh2yZNTVvVCPH4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=D+do45evPtNkod2c77usxAuvMdpPq6ygSj1ymf3wnDo461xiOvgaiTW4tKcKVwpe2DrhaFT5y9Bz+Yf5YNb3Z/jnpM3m+Wwk8zy9jGWhWuRzUXnoRY2xi+hUxITovSUdPia7kJmeDyLMYxLcd4AwPYz5Rq06jfU781Wb1ApZ3WQ= 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=209.85.167.207 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-f207.google.com with SMTP id 5614622812f47-471618e2082so4364202b6e.1 for ; Mon, 13 Apr 2026 20:55:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776138932; x=1776743732; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=zGCV6QQucbgm0nJTWP1fjoGfDrCnwyFKQ1NNbpQYS5o=; b=chUtn4yEDKGKuHKrgwBheLfo2oJGWIlQVPGqZwlFucmLZiGc7IZ6cGWlUlu6GdZaXs dn5wDauy2kV+1CFIjWNqXI7JQ10qnl41k6efwRjGWo+yleg361zUxHs3DySiIvRiLL+x kA0UvwEYOrsbALdFezzz1oRRSRKrfS6Bmkc+A5tcZPpXRUb2IKRSWlsO4ZVdqI0csVaz aF+R1AwOJHLW/7nSbyJfir7ipVA8Utk2b5f/88U1oQMWa3HkQtovgtZF7HFoaCQ8QCFR L+P4xgvAUGxk1hysSxUv9dJbGbXkV/6POxytLmZyqD3VvcvLYMRptTvKNx2Gl47tOalg FCGQ== X-Forwarded-Encrypted: i=1; AFNElJ8PbUs0TgLA56dQVpclR3qMGQp2Mc4Sj+ZbM5dmBH0TH3GX9TsEI0fIiW0KQ5mhel0odELV+SHNV1bFkYU=@vger.kernel.org X-Gm-Message-State: AOJu0YxlDNUHFAckmtThRepbvSLYbiIvzE6liHUBsZ7aOm2gVUi9NoOs dWPnaMY7/hgEHi86c2qnNbcw668DRznbD5K4RtGxcQzULcTdsJjG/JKl2ZSNwDcSS/Hiaep4QH5 /AptZa4RuYZuVHttKoukv5EwZ7elZnfEehihIrB6kkSyDn8row94pRiEU1YI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2109:b0:68c:78d2:e7e1 with SMTP id 006d021491bc7-68c78d2e84fmr6663364eaf.48.1776138932562; Mon, 13 Apr 2026 20:55:32 -0700 (PDT) Date: Mon, 13 Apr 2026 20:55:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ddbab4.a00a0220.475f0.0034.GAE@google.com> Subject: [syzbot] [udf?] WARNING in udf_new_block (2) From: syzbot To: jack@suse.com, 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: 7c6c4ed80b87 Merge tag 'vfs-7.0-rc8.fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1679fbd6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d46eab0cfd31c214 dashboard link: https://syzkaller.appspot.com/bug?extid=e8cf1c2a389352f54126 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 (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-7c6c4ed8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c8457f50ff92/vmlinux-7c6c4ed8.xz kernel image: https://storage.googleapis.com/syzbot-assets/e5a1d8ae449e/bzImage-7c6c4ed8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e8cf1c2a389352f54126@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 1024 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) UDF-fs: warning (device loop0): udf_update_inode: IO error syncing udf inode [00000347] ------------[ cut here ]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:1180 at mark_buffer_dirty+0x299/0x440 fs/buffer.c:1180, CPU#0: syz.0.0/5318 Modules linked in: CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mark_buffer_dirty+0x299/0x440 fs/buffer.c:1180 Code: 4c 89 f7 e8 e9 fc d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 c4 60 fb ff e8 7f 1c 6e ff eb 8c e8 78 1c 6e ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 6a 1c 6e ff 90 0f 0b 90 e9 cf fd ff ff RSP: 0018:ffffc9000e32f5d0 EFLAGS: 00010283 RAX: ffffffff8257b318 RBX: ffff888047e2ebc8 RCX: 0000000000100000 RDX: ffffc9000eb62000 RSI: 0000000000000a57 RDI: 0000000000000a58 RBP: ffffc9000e32f801 R08: ffff888047e2ebcf R09: 1ffff11008fc5d79 R10: dffffc0000000000 R11: ffffed1008fc5d7a R12: ffff8880126e8000 R13: 00000000000000bf R14: 000000000000017f R15: ffffc9000e32f950 FS: 00007f14e25e06c0(0000) GS:ffff88808ca49000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f14d560fe00 CR3: 0000000041faa000 CR4: 0000000000352ef0 Call Trace: udf_bitmap_new_block fs/udf/balloc.c:347 [inline] udf_new_block+0x183b/0x1c70 fs/udf/balloc.c:721 udf_add_aext fs/udf/inode.c:2131 [inline] udf_do_extend_file+0x878/0x11e0 fs/udf/inode.c:588 udf_extend_file fs/udf/inode.c:709 [inline] udf_setsize+0xbf3/0x10b0 fs/udf/inode.c:1297 udf_setattr+0x3a1/0x5a0 fs/udf/file.c:238 notify_change+0xc1a/0xf40 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b4/0x540 fs/open.c:118 do_sys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f14e179c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f14e25dffe8 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f14e1a15fa0 RCX: 00007f14e179c819 RDX: 0000000000000000 RSI: 00000020fdfffffe RDI: 0000200000000100 RBP: 00007f14e1832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f14e1a16038 R14: 00007f14e1a15fa0 R15: 00007ffe7a99f7e8 --- 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