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Mon, 26 Oct 2026 23:16:42 -0700 (PDT) Date: Mon, 26 Oct 2026 23:16:42 -0700 In-Reply-To: <6a81cb33.9ebadd4d.20b15e.0018.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae041ca.6200f071.51519.0f36.GAE@google.com> Subject: Re: [syzbot] [udf?] WARNING in udf_map_block From: syzbot To: golasch18@web.de, jack@suse.com, jack@suse.cz, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: d135ab453a74 Merge tag 'backlight-next-7.4' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13dadee1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b990d88b41ee3220 dashboard link: https://syzkaller.appspot.com/bug?extid=de2fef01040748da6822 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c93721580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16146469580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7442602f534e/disk-d135ab45.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ddc5d8dd9280/vmlinux-d135ab45.xz kernel image: https://storage.googleapis.com/syzbot-assets/ec40039f5ff5/bzImage-d135ab45.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2af222d62d5c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de2fef01040748da6822@syzkaller.appspotmail.com ------------[ cut here ]------------ iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB WARNING: fs/udf/inode.c:355 at udf_map_block+0x387f/0x4240 fs/udf/inode.c:355, CPU#0: syz.1.25/6056 Modules linked in: CPU: 0 UID: 0 PID: 6056 Comm: syz.1.25 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:udf_map_block+0x387f/0x4240 fs/udf/inode.c:355 Code: af 78 66 10 48 3b 84 24 40 03 00 00 75 49 89 d8 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 48 c2 0b 08 cc e8 f2 6e 5f fe 90 <0f> 0b 90 bb 8b ff ff ff 4c 8b 74 24 78 eb aa 44 89 f9 80 e1 07 80 RSP: 0018:ffffc900048b6fc0 EFLAGS: 00010293 RAX: ffffffff8368679e RBX: 0000000000000003 RCX: ffff888022703e80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900048b7350 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: ffffffff83687170 R12: ffffc900048b7368 R13: ffff88804a8a09a8 R14: dffffc0000000000 R15: ffff88804a8a07c8 FS: 00007fee297756c0(0000) GS:ffff888124732000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0274e99440 CR3: 000000002c070000 CR4: 00000000003526f0 Call Trace: __udf_get_block+0x52/0x250 fs/udf/inode.c:476 get_more_blocks fs/direct-io.c:644 [inline] do_direct_IO fs/direct-io.c:932 [inline] __blockdev_direct_IO+0x1965/0x33d0 fs/direct-io.c:1236 blockdev_direct_IO include/linux/fs.h:3160 [inline] udf_direct_IO+0x13b/0x210 fs/udf/inode.c:309 generic_file_read_iter+0x346/0x560 mm/filemap.c:3011 copy_splice_read+0x605/0xab0 fs/splice.c:362 do_splice_read fs/splice.c:979 [inline] splice_direct_to_actor+0x4c1/0xcc0 fs/splice.c:1077 do_splice_direct_actor fs/splice.c:1230 [inline] do_splice_direct+0x19b/0x2a0 fs/splice.c:1256 do_sendfile+0x540/0x7e0 fs/read_write.c:1371 __do_sys_sendfile64 fs/read_write.c:1432 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418 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: 0033:0x7fee2a13f559 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:00007fee29775028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fee2a3c6090 RCX: 00007fee2a13f559 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 00007fee2a1d6b20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000e3aa6ea R11: 0000000000000246 R12: 0000000000000000 R13: 00007fee2a3c6128 R14: 00007fee2a3c6090 R15: 00007fff0dc92f08 --- 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.