Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 UID: 0 PID: 5985 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:dst_mtu include/net/dst.h:219 [inline]
RIP: 0010:wg_xmit+0x355/0xf70 drivers/net/wireguard/device.c:173
Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 83 84 d9 fb 4d 8b 3f 49 83 c7 20 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 5d 84 d9 fb 4d 8b 3f 49 81 ff e0 38
RSP: 0018:ffffc90003cc7060 EFLAGS: 00010202
RAX: 0000000000000004 RBX: ffffc90003cc7ba0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003cc7190 R08: ffffffff8fced577 R09: 1ffffffff1f9daae
R10: dffffc0000000000 R11: fffffbfff1f9daaf R12: ffffc90003cc70c0
R13: 1ffff1102ebe283b R14: ffff888175f14180 R15: 0000000000000020
FS:  00005555734f8500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30663fff CR3: 00000001704ae000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __netdev_start_xmit include/linux/netdevice.h:5273 [inline]
 netdev_start_xmit include/linux/netdevice.h:5282 [inline]
 xmit_one net/core/dev.c:3853 [inline]
 dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869
 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819
 dev_queue_xmit include/linux/netdevice.h:3381 [inline]
 __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153
 ____bpf_clone_redirect net/core/filter.c:2487 [inline]
 bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450
 bpf_prog_bd919e7baf24f63c+0x5f/0x68
 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline]
 __bpf_prog_run include/linux/filter.h:723 [inline]
 bpf_prog_run include/linux/filter.h:730 [inline]
 bpf_test_run+0x354/0x830 net/bpf/test_run.c:423
 bpf_prog_test_run_skb+0x13b4/0x1e00 net/bpf/test_run.c:1168
 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721
 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246
 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc57899acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd806bfbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc578c15fa0 RCX: 00007fc57899acb9
RDX: 0000000000000050 RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007fc578a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc578c15fac R14: 00007fc578c15fa0 R15: 00007fc578c15fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dst_mtu include/net/dst.h:219 [inline]
RIP: 0010:wg_xmit+0x355/0xf70 drivers/net/wireguard/device.c:173
Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 83 84 d9 fb 4d 8b 3f 49 83 c7 20 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 5d 84 d9 fb 4d 8b 3f 49 81 ff e0 38
RSP: 0018:ffffc90003cc7060 EFLAGS: 00010202
RAX: 0000000000000004 RBX: ffffc90003cc7ba0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003cc7190 R08: ffffffff8fced577 R09: 1ffffffff1f9daae
R10: dffffc0000000000 R11: fffffbfff1f9daaf R12: ffffc90003cc70c0
R13: 1ffff1102ebe283b R14: ffff888175f14180 R15: 0000000000000020
FS:  00005555734f8500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30663fff CR3: 00000001704ae000 CR4: 00000000000006f0
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   6:	08 4c 89 ff          	or     %cl,-0x1(%rcx,%rcx,4)
   a:	e8 83 84 d9 fb       	call   0xfbd98492
   f:	4d 8b 3f             	mov    (%r15),%r15
  12:	49 83 c7 20          	add    $0x20,%r15
  16:	4c 89 f8             	mov    %r15,%rax
  19:	48 c1 e8 03          	shr    $0x3,%rax
  1d:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  24:	fc ff df
* 27:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2b:	74 08                	je     0x35
  2d:	4c 89 ff             	mov    %r15,%rdi
  30:	e8 5d 84 d9 fb       	call   0xfbd98492
  35:	4d 8b 3f             	mov    (%r15),%r15
  38:	49                   	rex.WB
  39:	81                   	.byte 0x81
  3a:	ff e0                	jmp    *%rax
  3c:	38                   	.byte 0x38