Oops: general protection fault, probably for non-canonical address 0xdffffc0000000083: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000418-0x000000000000041f]
CPU: 0 UID: 0 PID: 6839 Comm: kworker/0:4 Not tainted 6.16.0-rc3-syzkaller-00042-g78f4e737a53e #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: wg-crypt-wg1 wg_packet_tx_worker
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:270 [inline]
RIP: 0010:fib_lookup_good_nhc+0xaf/0x3f0 net/ipv4/fib_trie.c:1408
Code: df 48 c1 ea 03 80 3c 02 00 0f 85 1e 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 2b 48 8d bd 18 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ef 02 00 00 4c 8b bd 18 04 00 00 e8 9b 7f 7c 01
RSP: 0018:ffffc90006fcf7e8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888044792420 RCX: ffffffff8a002157
RDX: 0000000000000083 RSI: ffffffff8a002179 RDI: 0000000000000418
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90006fcfaf8
R13: ffff888044792437 R14: 0000000000000001 R15: ffff88807009c818
FS:  0000000000000000(0000) GS:ffff888097560000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000c2b61ec CR3: 000000007140a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nexthop_get_nhc_lookup include/net/nexthop.h:437 [inline]
 fib_table_lookup+0x158e/0x2300 net/ipv4/fib_trie.c:1584
 fib_lookup.constprop.0+0x13e/0x530 include/net/ip_fib.h:390
 ip_route_output_key_hash_rcu+0xde2/0x28f0 net/ipv4/route.c:2803
 ip_route_output_key_hash+0x137/0x2e0 net/ipv4/route.c:2694
 __ip_route_output_key include/net/route.h:169 [inline]
 ip_route_output_flow+0x27/0x150 net/ipv4/route.c:2921
 send4+0x54b/0x1070 drivers/net/wireguard/socket.c:61
 wg_socket_send_skb_to_peer+0x18f/0x210 drivers/net/wireguard/socket.c:175
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1aa/0x810 drivers/net/wireguard/send.c:276
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:270 [inline]
RIP: 0010:fib_lookup_good_nhc+0xaf/0x3f0 net/ipv4/fib_trie.c:1408
Code: df 48 c1 ea 03 80 3c 02 00 0f 85 1e 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 2b 48 8d bd 18 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ef 02 00 00 4c 8b bd 18 04 00 00 e8 9b 7f 7c 01
RSP: 0018:ffffc90006fcf7e8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888044792420 RCX: ffffffff8a002157
RDX: 0000000000000083 RSI: ffffffff8a002179 RDI: 0000000000000418
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90006fcfaf8
R13: ffff888044792437 R14: 0000000000000001 R15: ffff88807009c818
FS:  0000000000000000(0000) GS:ffff888097560000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000c2b61ec CR3: 000000007140a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 1e 03 00 00    	jne    0x32c
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	48 8b 2b             	mov    (%rbx),%rbp
  1b:	48 8d bd 18 04 00 00 	lea    0x418(%rbp),%rdi
  22:	48 89 fa             	mov    %rdi,%rdx
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2d:	0f 85 ef 02 00 00    	jne    0x322
  33:	4c 8b bd 18 04 00 00 	mov    0x418(%rbp),%r15
  3a:	e8 9b 7f 7c 01       	call   0x17c7fda