general protection fault, probably for non-canonical address 0xdffffc000000005a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002d0-0x00000000000002d7] CPU: 0 PID: 28854 Comm: syz.5.7972 Not tainted 6.1.145-syzkaller-00015-g87b9d836c3d8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:259 [inline] RIP: 0010:fib_lookup_good_nhc net/ipv4/fib_trie.c:1413 [inline] RIP: 0010:nexthop_get_nhc_lookup+0x17e/0x750 include/net/nexthop.h:405 Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 68 4a 7c fd 48 89 5d a8 48 8b 1b b8 d0 02 00 00 48 01 c3 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 43 4a 7c fd 48 8b 1b 48 85 db 0f RSP: 0018:ffffc900099fef50 EFLAGS: 00010206 RAX: 000000000000005a RBX: 00000000000002d0 RCX: 0000000000000002 RDX: ffff888126028000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900099fefc0 R08: dffffc0000000000 R09: ffffc900099ff190 R10: fffff5200133fe3a R11: 1ffff9200133fe32 R12: ffff88811be07c00 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900099ff190 FS: 00007f49307f76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffd CR3: 000000011a9b5000 CR4: 00000000003506b0 Call Trace: fib_table_lookup+0x10b7/0x1a60 net/ipv4/fib_trie.c:1590 nl_fib_lookup net/ipv4/fib_frontend.c:1374 [inline] nl_fib_input+0x477/0x840 net/ipv4/fib_frontend.c:1408 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x8b1/0xa30 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x8aa/0xbc0 net/netlink/af_netlink.c:1860 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] sock_sendmsg net/socket.c:751 [inline] kernel_sendmsg+0x222/0x320 net/socket.c:775 sock_no_sendpage+0xf4/0x150 net/core/sock.c:3258 kernel_sendpage+0x256/0x2d0 net/socket.c:3596 sock_sendpage+0x86/0xb0 net/socket.c:1079 pipe_to_sendpage+0x22d/0x320 fs/splice.c:360 splice_from_pipe_feed fs/splice.c:414 [inline] __splice_from_pipe+0x33b/0x910 fs/splice.c:558 splice_from_pipe fs/splice.c:593 [inline] generic_splice_sendpage+0xf3/0x150 fs/splice.c:742 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xf7/0x130 fs/splice.c:930 splice_direct_to_actor+0x4a2/0xb10 fs/splice.c:885 do_splice_direct+0x1b3/0x2c0 fs/splice.c:973 do_sendfile+0x5c6/0xeb0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x18f/0x1f0 fs/read_write.c:1309 x64_sys_call+0x62c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4931d8ebe9 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:00007f49307f7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f4931fb5fa0 RCX: 00007f4931d8ebe9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f4931e11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 000080001d00c0d1 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4931fb6038 R14: 00007f4931fb5fa0 R15: 00007ffed9dd17b8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:259 [inline] RIP: 0010:fib_lookup_good_nhc net/ipv4/fib_trie.c:1413 [inline] RIP: 0010:nexthop_get_nhc_lookup+0x17e/0x750 include/net/nexthop.h:405 Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 68 4a 7c fd 48 89 5d a8 48 8b 1b b8 d0 02 00 00 48 01 c3 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 43 4a 7c fd 48 8b 1b 48 85 db 0f RSP: 0018:ffffc900099fef50 EFLAGS: 00010206 RAX: 000000000000005a RBX: 00000000000002d0 RCX: 0000000000000002 RDX: ffff888126028000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900099fefc0 R08: dffffc0000000000 R09: ffffc900099ff190 R10: fffff5200133fe3a R11: 1ffff9200133fe32 R12: ffff88811be07c00 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900099ff190 FS: 00007f49307f76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffd CR3: 000000011a9b5000 CR4: 00000000003506b0 ---------------- Code disassembly (best guess): 0: d8 48 c1 fmuls -0x3f(%rax) 3: e8 03 42 80 3c call 0x3c80420b 8: 28 00 sub %al,(%rax) a: 74 08 je 0x14 c: 48 89 df mov %rbx,%rdi f: e8 68 4a 7c fd call 0xfd7c4a7c 14: 48 89 5d a8 mov %rbx,-0x58(%rbp) 18: 48 8b 1b mov (%rbx),%rbx 1b: b8 d0 02 00 00 mov $0x2d0,%eax 20: 48 01 c3 add %rax,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 43 4a 7c fd call 0xfd7c4a7c 39: 48 8b 1b mov (%rbx),%rbx 3c: 48 85 db test %rbx,%rbx 3f: 0f .byte 0xf