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: 8704 Comm: kworker/u4:29 Not tainted 6.1.145-syzkaller-00002-gc750dc582629 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
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 78 15 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 53 15 7c fd 48 8b 1b 48 85 db 0f
RSP: 0018:ffffc900012a7698 EFLAGS: 00010206
RAX: 000000000000005a RBX: 00000000000002d0 RCX: 0000000000000000
RDX: ffff88811d000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012a7708 R08: dffffc0000000000 R09: ffffc900012a7900
R10: fffff52000254f26 R11: 1ffff92000254f20 R12: ffff88812ca97900
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900012a7a40
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c31ed85 CR3: 000000017df4e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fib_table_lookup+0x10b7/0x1a60 net/ipv4/fib_trie.c:1590
 fib_lookup include/net/ip_fib.h:384 [inline]
 ip_route_output_key_hash_rcu+0x497/0x2060 net/ipv4/route.c:2781
 ip_route_output_key_hash net/ipv4/route.c:2671 [inline]
 __ip_route_output_key include/net/route.h:137 [inline]
 ip_route_output_flow+0x12e/0x2e0 net/ipv4/route.c:2901
 send4+0x317/0x9a0 drivers/net/wireguard/socket.c:61
 wg_socket_send_skb_to_peer+0xd4/0x1d0 drivers/net/wireguard/socket.c:175
 wg_socket_send_buffer_to_peer+0x118/0x170 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x1d4/0x240 drivers/net/wireguard/send.c:51
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:397
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
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 78 15 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 53 15 7c fd 48 8b 1b 48 85 db 0f
RSP: 0018:ffffc900012a7698 EFLAGS: 00010206
RAX: 000000000000005a RBX: 00000000000002d0 RCX: 0000000000000000
RDX: ffff88811d000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012a7708 R08: dffffc0000000000 R09: ffffc900012a7900
R10: fffff52000254f26 R11: 1ffff92000254f20 R12: ffff88812ca97900
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900012a7a40
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c31ed85 CR3: 000000017df4e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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 78 15 7c fd       	call   0xfd7c158c
  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 53 15 7c fd       	call   0xfd7c158c
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 85 db             	test   %rbx,%rbx
  3f:	0f                   	.byte 0xf