general protection fault, probably for non-canonical address 0xdffffc000000005b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000002d8-0x00000000000002df]
CPU: 0 PID: 16922 Comm: syz.9.17818 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline]
RIP: 0010:fib_lookup_good_nhc net/ipv4/fib_trie.c:1363 [inline]
RIP: 0010:nexthop_get_nhc_lookup+0x1a2/0x6c0 include/net/nexthop.h:291
Code: 74 08 48 89 df e8 7e 6f bf fd 48 89 5d a8 48 8b 1b b8 d8 02 00 00 48 01 c3 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 50 6f bf fd 48 8b 1b 48 85 db 74 68
RSP: 0018:ffffc90001b7f6a8 EFLAGS: 00010202
RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000
RDX: ffff8881100b4f00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90001b7f718 R08: ffff8881100b4f00 R09: 0000000000000003
R10: 0000000000000008 R11: 0000000000000002 R12: ffff88812bf35600
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88811988bf90
FS:  00007f95363496c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000280 CR3: 000000015c647000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 fib_table_lookup+0xe4c/0x1730 net/ipv4/fib_trie.c:1542
 fib4_rule_action+0x115/0x1a0 net/ipv4/fib_rules.c:135
 fib_rules_lookup+0x489/0x8d0 net/core/fib_rules.c:318
 __fib_lookup+0xe4/0x150 net/ipv4/fib_rules.c:92
 fib_lookup include/net/ip_fib.h:371 [inline]
 ip_route_output_key_hash_rcu+0x345/0x20e0 net/ipv4/route.c:2674
 ip_route_output_key_hash+0x123/0x1c0 net/ipv4/route.c:2564
 __ip_route_output_key include/net/route.h:126 [inline]
 ip_route_connect include/net/route.h:319 [inline]
 __ip4_datagram_connect+0x621/0x1070 net/ipv4/datagram.c:48
 ip4_datagram_connect+0x2d/0x40 net/ipv4/datagram.c:90
 inet_dgram_connect+0x1ea/0x3f0 net/ipv4/af_inet.c:587
 __sys_connect_file net/socket.c:1866 [inline]
 __sys_connect+0x38c/0x410 net/socket.c:1883
 __do_sys_connect net/socket.c:1893 [inline]
 __se_sys_connect net/socket.c:1890 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1890
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f95378e0ba9
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:00007f9536349038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f9537b27fa0 RCX: 00007f95378e0ba9
RDX: 0000000000000010 RSI: 0000200000000480 RDI: 0000000000000003
RBP: 00007f9537963e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9537b28038 R14: 00007f9537b27fa0 R15: 00007ffecde990f8
Modules linked in:
---[ end trace 9a853898103da9b5 ]---
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline]
RIP: 0010:fib_lookup_good_nhc net/ipv4/fib_trie.c:1363 [inline]
RIP: 0010:nexthop_get_nhc_lookup+0x1a2/0x6c0 include/net/nexthop.h:291
Code: 74 08 48 89 df e8 7e 6f bf fd 48 89 5d a8 48 8b 1b b8 d8 02 00 00 48 01 c3 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 50 6f bf fd 48 8b 1b 48 85 db 74 68
RSP: 0018:ffffc90001b7f6a8 EFLAGS: 00010202
RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000
RDX: ffff8881100b4f00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90001b7f718 R08: ffff8881100b4f00 R09: 0000000000000003
R10: 0000000000000008 R11: 0000000000000002 R12: ffff88812bf35600
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88811988bf90
FS:  00007f95363496c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2af0a59198 CR3: 000000015c647000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	74 08                	je     0xa
   2:	48 89 df             	mov    %rbx,%rdi
   5:	e8 7e 6f bf fd       	call   0xfdbf6f88
   a:	48 89 5d a8          	mov    %rbx,-0x58(%rbp)
   e:	48 8b 1b             	mov    (%rbx),%rbx
  11:	b8 d8 02 00 00       	mov    $0x2d8,%eax
  16:	48 01 c3             	add    %rax,%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 50 6f bf fd       	call   0xfdbf6f88
  38:	48 8b 1b             	mov    (%rbx),%rbx
  3b:	48 85 db             	test   %rbx,%rbx
  3e:	74 68                	je     0xa8