Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 0 UID: 0 PID: 11050 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
RIP: 0010:rt_cache_valid net/ipv4/route.c:1582 [inline]
RIP: 0010:__mkroute_output net/ipv4/route.c:2650 [inline]
RIP: 0010:ip_route_output_key_hash_rcu+0x12ba/0x25d0 net/ipv4/route.c:2875
Code: c3 31 ff 89 c6 e8 76 1b ce f7 85 db 74 5b e8 2d 17 ce f7 eb 05 e8 26 17 ce f7 4d 85 ff 74 36 49 8d 5f 3a 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ff 10 00 00 0f b7 1b bf ff ff 00 00 89
RSP: 0018:ffffc9001f1ef580 EFLAGS: 00010212
RAX: 0000000000000007 RBX: 0000000000000039 RCX: ffff888027698000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000080000000 R08: ffff888027698000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888034aafc58 R15: ffffffffffffffff
FS:  0000000000000000(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f774be708c0 CR3: 0000000031118000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2705
 __ip_route_output_key include/net/route.h:169 [inline]
 ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
 send4+0x463/0xed0 drivers/net/wireguard/socket.c:61
 wg_socket_send_skb_to_peer+0xd1/0x1d0 drivers/net/wireguard/socket.c:175
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x203/0x350 drivers/net/wireguard/send.c:51
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rt_cache_valid net/ipv4/route.c:1582 [inline]
RIP: 0010:__mkroute_output net/ipv4/route.c:2650 [inline]
RIP: 0010:ip_route_output_key_hash_rcu+0x12ba/0x25d0 net/ipv4/route.c:2875
Code: c3 31 ff 89 c6 e8 76 1b ce f7 85 db 74 5b e8 2d 17 ce f7 eb 05 e8 26 17 ce f7 4d 85 ff 74 36 49 8d 5f 3a 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ff 10 00 00 0f b7 1b bf ff ff 00 00 89
RSP: 0018:ffffc9001f1ef580 EFLAGS: 00010212
RAX: 0000000000000007 RBX: 0000000000000039 RCX: ffff888027698000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000080000000 R08: ffff888027698000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888034aafc58 R15: ffffffffffffffff
FS:  0000000000000000(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f774be708c0 CR3: 0000000031118000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	c3                   	ret
   1:	31 ff                	xor    %edi,%edi
   3:	89 c6                	mov    %eax,%esi
   5:	e8 76 1b ce f7       	call   0xf7ce1b80
   a:	85 db                	test   %ebx,%ebx
   c:	74 5b                	je     0x69
   e:	e8 2d 17 ce f7       	call   0xf7ce1740
  13:	eb 05                	jmp    0x1a
  15:	e8 26 17 ce f7       	call   0xf7ce1740
  1a:	4d 85 ff             	test   %r15,%r15
  1d:	74 36                	je     0x55
  1f:	49 8d 5f 3a          	lea    0x3a(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 ff 10 00 00    	jne    0x1136
  37:	0f b7 1b             	movzwl (%rbx),%ebx
  3a:	bf ff ff 00 00       	mov    $0xffff,%edi
  3f:	89                   	.byte 0x89