------------[ cut here ]------------ WARNING: CPU: 0 PID: 6028 at fs/udf/inode.c:2081 __udf_add_aext+0x555/0x700 fs/udf/inode.c:2080 Modules linked in: CPU: 0 UID: 0 PID: 6028 Comm: syz.2.16 Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__udf_add_aext+0x555/0x700 fs/udf/inode.c:2080 Code: 17 d7 fe 49 8b 3c 24 4c 89 fe e8 a6 d3 fb fe 31 c0 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 ec 6e 6f fe 90 <0f> 0b 90 e9 e7 fb ff ff e8 de 6e 6f fe 90 0f 0b 90 e9 54 fc ff ff RSP: 0018:ffffc9000b55e8d8 EFLAGS: 00010246 RAX: ffffffff83534d74 RBX: 1ffff920016abd67 RCX: 0000000000080000 RDX: ffffc9000c7e9000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: 0000000000000000 R08: ffffffff83534956 R09: ffffffff83534886 R10: 0000000000000002 R11: ffff888027798000 R12: ffffc9000b55eb30 R13: 0000000000000004 R14: dffffc0000000000 R15: ffffc9000b55eb38 FS: 00007f745d21a6c0(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fec5825f000 CR3: 000000006a506000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: udf_add_aext fs/udf/inode.c:2138 [inline] udf_insert_aext fs/udf/inode.c:2317 [inline] udf_update_extents fs/udf/inode.c:1205 [inline] inode_getblk fs/udf/inode.c:919 [inline] udf_map_block+0x402c/0x55c0 fs/udf/inode.c:447 __udf_get_block+0x128/0x410 fs/udf/inode.c:461 __block_write_begin_int+0x691/0x1930 fs/buffer.c:2116 udf_page_mkwrite+0x5bf/0x8d0 fs/udf/file.c:65 do_page_mkwrite+0x159/0x340 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x2b7e/0x5dc0 mm/memory.c:3907 handle_pte_fault+0xfaf/0x61c0 mm/memory.c:6013 __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x1030/0x1aa0 mm/memory.c:6309 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2bb/0x920 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000b55fac8 EFLAGS: 00050246 RAX: ffffffff84fc4601 RBX: 000020000007d040 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffffc9000b55fb60 RDI: 000020000007d000 RBP: ffffc9000b55fc10 R08: ffffc9000b55fb9f R09: 1ffff920016abf73 R10: dffffc0000000000 R11: fffff520016abf74 R12: 0000000000000040 R13: 00007ffffffff000 R14: ffffc9000b55fb60 R15: 000020000007d000 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:197 [inline] _copy_to_user+0x8b/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] rng_dev_read+0x3dc/0x720 drivers/char/hw_random/core.c:258 do_loop_readv_writev fs/read_write.c:845 [inline] vfs_readv+0x6be/0xa80 fs/read_write.c:1018 do_preadv fs/read_write.c:1130 [inline] __do_sys_preadv fs/read_write.c:1177 [inline] __se_sys_preadv fs/read_write.c:1172 [inline] __x64_sys_preadv+0x1ba/0x2d0 fs/read_write.c:1172 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f745c38e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f745d21a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f745c5b5fa0 RCX: 00007f745c38e969 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007f745c410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f745c5b5fa0 R15: 00007ffdf7f4cf28 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W