syz.1.1618: attempt to access beyond end of device nbd1: rw=0, sector=256, nr_sectors = 1 limit=0 UDF-fs: error (device nbd1): udf_read_tagged: read failed, block=256, location=256 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 12420 at fs/buffer.c:1125 __getblk_slow+0x4cc/0x560 fs/buffer.c:1125 Modules linked in: CPU: 1 UID: 0 PID: 12420 Comm: syz.1.1618 Not tainted 6.16.0-syzkaller-08685-g260f6f4fda93 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__getblk_slow+0x4cc/0x560 fs/buffer.c:1125 Code: c0 8b 48 89 df e8 74 a2 bc ff 90 0f 0b e8 fc 1c 75 ff 48 c7 c6 20 52 c0 8b 48 89 df e8 5d a2 bc ff 90 0f 0b e8 e5 1c 75 ff 90 <0f> 0b 90 8b 74 24 0c 89 ea 48 c7 c7 80 53 c0 8b 31 db e8 5d e7 53 RSP: 0018:ffffc90003b677d0 EFLAGS: 00010283 RAX: 00000000000063ec RBX: 0000000000000200 RCX: ffffc9000c041000 RDX: 0000000000080000 RSI: ffffffff8245e2fb RDI: 0000000000000005 RBP: 0000000000000400 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000200 R11: 0000000000000001 R12: ffff88801e391700 R13: 0000000000000200 R14: 0000000000000200 R15: ffff88801e391700 FS: 0000000000000000(0000) GS:ffff888097627000(0063) knlGS:00000000f506eb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002fa04ff8 CR3: 000000005fc4e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: bdev_getblk+0xd4/0xe0 fs/buffer.c:1461 __bread_gfp+0x86/0x3c0 fs/buffer.c:1515 sb_bread include/linux/buffer_head.h:346 [inline] udf_read_tagged+0xae/0x740 fs/udf/misc.c:199 udf_check_anchor_block+0x89/0x4b0 fs/udf/super.c:1912 udf_scan_anchors fs/udf/super.c:1990 [inline] udf_load_vrs+0x682/0x1070 fs/udf/super.c:2033 udf_fill_super+0x791/0x1df0 fs/udf/super.c:2201 get_tree_bdev_flags+0x389/0x620 fs/super.c:1692 vfs_get_tree+0x8b/0x340 fs/super.c:1815 do_new_mount fs/namespace.c:3805 [inline] path_mount+0x1482/0x1fd0 fs/namespace.c:4120 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount fs/namespace.c:4321 [inline] __ia32_sys_mount+0x28b/0x310 fs/namespace.c:4321 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf707e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f506e55c EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000080004a00 RDX: 0000000080000080 RSI: 0000000000000014 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi