general protection fault, probably for non-canonical address 0xdffffc000000006b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000358-0x000000000000035f]
CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline]
RIP: 0010:fib_lookup_good_nhc+0x81/0x3d0 net/ipv4/fib_trie.c:1407
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 af c3 51 f9 41 bc 58 03 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 90 c3 51 f9 4d 8b 24 24 e8 87 0a
RSP: 0018:ffffc90000ce7398 EFLAGS: 00010202
RAX: 000000000000006b RBX: ffff888024906320 RCX: ffff88813fed0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88802490632f R08: dffffc0000000000 R09: fffffbfff1ff7419
R10: fffffbfff1ff7419 R11: 1ffffffff1ff7418 R12: 0000000000000358
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11004920c65
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fc13ff8 CR3: 000000004b4c9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 3a810b1eb6134bdc DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nexthop_get_nhc_lookup+0x1a8/0x400 include/net/nexthop.h:405
 fib_table_lookup+0xe76/0x15e0 net/ipv4/fib_trie.c:1583
 fib4_rule_action+0x1cf/0x2f0 net/ipv4/fib_rules.c:135
 fib_rules_lookup+0x5ab/0xaf0 net/core/fib_rules.c:318
 __fib_lookup+0xf6/0x200 net/ipv4/fib_rules.c:92
 ip_route_output_key_hash_rcu+0x305/0x2460 net/ipv4/route.c:2785
 ip_route_output_key_hash+0x1b1/0x2e0 net/ipv4/route.c:2675
 __ip_route_output_key include/net/route.h:126 [inline]
 ip_route_output_flow+0x26/0x150 net/ipv4/route.c:2905
 send4+0x425/0xd90 drivers/net/wireguard/socket.c:61
 wg_socket_send_skb_to_peer+0xcd/0x1c0 drivers/net/wireguard/socket.c:175
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x1d8/0x310 drivers/net/wireguard/send.c:51
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace 4b0174280158d199 ]---
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline]
RIP: 0010:fib_lookup_good_nhc+0x81/0x3d0 net/ipv4/fib_trie.c:1407
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 af c3 51 f9 41 bc 58 03 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 90 c3 51 f9 4d 8b 24 24 e8 87 0a
RSP: 0018:ffffc90000ce7398 EFLAGS: 00010202
RAX: 000000000000006b RBX: ffff888024906320 RCX: ffff88813fed0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88802490632f R08: dffffc0000000000 R09: fffffbfff1ff7419
R10: fffffbfff1ff7419 R11: 1ffffffff1ff7418 R12: 0000000000000358
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11004920c65
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fc13ff8 CR3: 000000004b4c9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 3a810b1eb6134bdc DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 89 24 24          	mov    %r12,(%rsp)
   4:	48 89 d8             	mov    %rbx,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  10:	74 08                	je     0x1a
  12:	48 89 df             	mov    %rbx,%rdi
  15:	e8 af c3 51 f9       	call   0xf951c3c9
  1a:	41 bc 58 03 00 00    	mov    $0x358,%r12d
  20:	4c 03 23             	add    (%rbx),%r12
  23:	4c 89 e0             	mov    %r12,%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:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 90 c3 51 f9       	call   0xf951c3c9
  39:	4d 8b 24 24          	mov    (%r12),%r12
  3d:	e8                   	.byte 0xe8
  3e:	87 0a                	xchg   %ecx,(%rdx)