From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f4.google.com (mail-oi2-f4.google.com [74.125.231.196]) (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 DC97E78C9C for ; Sun, 23 Aug 2026 07:25:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787469934; cv=none; b=pCKfzmKtG5bECwzDKW+ZGGqzB6WVIKLRU8OJofHalXJg0XIEs4Oj1QpOdYsQwt6kdySn3A87DQX2rwAwB3h1svw3XRPukdhGDO/K+7qRRoFN09/O5CUMWFy3tiaXGYzgcYIBK5L9T4yCkfYNJFbkGgXBp+gyMCv1/m0XyqUfWyI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787469934; c=relaxed/simple; bh=OxUj3y73KcnGHacbOmNafWkhZWkscOcGkkEAFpq0Bcg=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=WsxR0Q1MyB7I8e2T3u+6KiiyJ81kAxQQaYpqt1W80OJCqgCNiP3Xr2ftlUDiThh9iy35r2Xf71Q/Ousc3I2+BgNcAY2mFdsuPgEjqoRn5qAoIKdpe2TS/K/wqi8eiEHpjWdLAt0baIrWWrzl6ps51q6+/jKSy+pvXNQuzurpEoM= 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=74.125.231.196 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-oi2-f4.google.com with SMTP id 5614622812f47-49ec9d117f2so139052b6e.0 for ; Sun, 23 Aug 2026 00:25:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787469931; x=1788074731; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=SBzUusPWKuC1wtZOMcsJgOczwgZLmy2GSye6w3xwRQI=; b=EvZfpMu+TjiUHBgIPhviUZEIlLQkZDbEyHkpR2EBNeubEyo+Cbu9TV18+rR+TjaRcN H5GO1ii19VNpFBB8JzQi13pheGHgnALaGa6BiQtQU55xc3hfKV0IRIk+Ca6oAU9cbP9L v+Hq4XNjGFYZBAYDSD8POgR+UMU48desq3hmA5FoueKJvxVDo/KQ+A/9r+rJkyNtZQ81 ae8j9eEFZ5g46r/f5OJtzw+OxwSuZy/EU+9kFzirOZoHXjJRWI456KiwWsBocLYynRQ8 pLdS9L5U2IVF/96AqRy8clkR8+jqb6sw3w+P2YZDLTejsLMDXVvB4Inc2paELNKlmEXx 52eg== X-Forwarded-Encrypted: i=1; AHgh+RqWb9JaqsKri2Cr/8SBsME4eLdHAsdZWUT6e6X5om/nrHVXE+9/iFMwPWvuTRRxymxaO5TmB/6/Z1fxVzk=@vger.kernel.org X-Gm-Message-State: AFuF++nKIYHUDzcJ4Dy00vMUTm9vt9eaYry9Y+c07rPvJiUwk7N08NH6 hD6mNmdTaXJVALP9m33Uvdq0+RpUIBHrN5aE9Kf75HLyj6xaGenZMF0lvfF0mN3tRou0Qls3rAA cdMebfFwGZBm+osm154Dov/xI0I8JMUuIh7lb26qd9U0Ep6E8GK3jP7Wf5jo= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1202:b0:4ab:2764:1911 with SMTP id 5614622812f47-4b309bd8e61mr9750069b6e.19.1787469931744; Sun, 23 Aug 2026 00:25:31 -0700 (PDT) Date: Sun, 23 Aug 2026 00:25:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8aa06b.91706f20.16b6e3.02c3.GAE@google.com> Subject: [syzbot] [udf?] WARNING in udf_new_block (3) 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: b126f6f5940f Merge tag 'x86_mm_for_7.3-rc1' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=124f8e79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fc79d903e3f45b4b dashboard link: https://syzkaller.appspot.com/bug?extid=118631ef5b63f166c204 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 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-b126f6f5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c87ba89d4d75/vmlinux-b126f6f5.xz kernel image: https://storage.googleapis.com/syzbot-assets/401019d8b5df/bzImage-b126f6f5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+118631ef5b63f166c204@syzkaller.appspotmail.com ------------[ cut here ]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:991 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:991, CPU#0: syz.0.0/5327 Modules linked in: CPU: 0 UID: 0 PID: 5327 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+0x299/0x410 fs/buffer.c:991 Code: 4c 89 f7 e8 79 89 d8 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 74 52 fb ff e8 7f 37 69 ff eb 8c e8 78 37 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 6a 37 69 ff 90 0f 0b 90 e9 cf fd ff ff RSP: 0018:ffffc9000de8f270 EFLAGS: 00010283 RAX: ffffffff825def18 RBX: ffff88804386d9a0 RCX: 0000000000100000 RDX: ffffc9000f4b1000 RSI: 0000000000054649 RDI: 000000000005464a RBP: ffffc9000de8f401 R08: ffff88804386d9a7 R09: 1ffff1100870db34 R10: dffffc0000000000 R11: ffffed100870db35 R12: ffff8880129f6000 R13: dffffc0000000000 R14: 00000000000000e6 R15: 0000000000000026 FS: 00007f8be61816c0(0000) GS:ffff88808c533000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000136cb000 CR4: 0000000000352ef0 Call Trace: udf_bitmap_new_block fs/udf/balloc.c:348 [inline] udf_new_block+0x17d9/0x1c00 fs/udf/balloc.c:722 inode_getblk fs/udf/inode.c:898 [inline] udf_map_block+0x138e/0x4270 fs/udf/inode.c:451 __udf_get_block+0x52/0x250 fs/udf/inode.c:465 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2027 block_write_begin+0x8d/0x120 fs/buffer.c:2138 udf_write_begin+0x118/0x270 fs/udf/inode.c:259 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4364 udf_file_write_iter+0x2e8/0x6c0 fs/udf/file.c:112 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8be539e0d9 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:00007f8be6180fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8be5626090 RCX: 00007f8be539e0d9 RDX: 000000000000ffc9 RSI: 0000200000000140 RDI: 000000000000000d RBP: 00007f8be5435024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8be5626128 R14: 00007f8be5626090 R15: 00007ffef6d34418 --- 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