kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8863 Comm: syz-executor.5 Not tainted 5.4.190-syzkaller-00044-g77dc925ddffb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nexthop_create_group net/ipv4/nexthop.c:1134 [inline]
RIP: 0010:nexthop_add net/ipv4/nexthop.c:1319 [inline]
RIP: 0010:rtm_new_nexthop+0x2206/0x6480 net/ipv4/nexthop.c:1518
Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 08 e8 a3 39 f5 fd 48 8b 44 24 08 48 89 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 7c 39 f5 fd 48 8b 44 24 08 48 89 03
RSP: 0018:ffff8881e9f176a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffffc90000144000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff8881e9f178a0 R08: ffffffff82327704 R09: fffffbfff0b2c38b
R10: fffffbfff0b2c38b R11: 1ffffffff0b2c38a R12: ffff8881f19f3000
R13: 0000000000000014 R14: 0000000000000011 R15: 0000000000010001
FS:  00007efc58c4b700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a1dd4d718 CR3: 00000001e50ea000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rtnetlink_rcv_msg+0x8c6/0xb90 net/core/rtnetlink.c:5262
 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2500
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x771/0x8d0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x913/0xb90 net/netlink/af_netlink.c:1933
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 ____sys_sendmsg+0x4ee/0x7c0 net/socket.c:2287
 ___sys_sendmsg net/socket.c:2341 [inline]
 __sys_sendmsg+0x235/0x2f0 net/socket.c:2387
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7efc59ad5109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efc58c4b168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007efc59be7f60 RCX: 00007efc59ad5109
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00007efc58c4b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff88e2345f R14: 00007efc58c4b300 R15: 0000000000022000
Modules linked in:
---[ end trace 79e3f3907bb2cf66 ]---
RIP: 0010:nexthop_create_group net/ipv4/nexthop.c:1134 [inline]
RIP: 0010:nexthop_add net/ipv4/nexthop.c:1319 [inline]
RIP: 0010:rtm_new_nexthop+0x2206/0x6480 net/ipv4/nexthop.c:1518
Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 08 e8 a3 39 f5 fd 48 8b 44 24 08 48 89 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 7c 39 f5 fd 48 8b 44 24 08 48 89 03
RSP: 0018:ffff8881e9f176a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffffc90000144000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff8881e9f178a0 R08: ffffffff82327704 R09: fffffbfff0b2c38b
R10: fffffbfff0b2c38b R11: 1ffffffff0b2c38a R12: ffff8881f19f3000
R13: 0000000000000014 R14: 0000000000000011 R15: 0000000000010001
FS:  00007efc58c4b700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1e0fd9058 CR3: 00000001e50ea000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 80 3c 01 00 74    	add    %al,0x7400013c(%rax)
   6:	0a 48 8b             	or     -0x75(%rax),%cl
   9:	7c 24                	jl     0x2f
   b:	08 e8                	or     %ch,%al
   d:	a3 39 f5 fd 48 8b 44 	movabs %eax,0x824448b48fdf539
  14:	24 08
  16:	48 89 18             	mov    %rbx,(%rax)
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 7c 39 f5 fd       	callq  0xfdf539b4
  38:	48 8b 44 24 08       	mov    0x8(%rsp),%rax
  3d:	48 89 03             	mov    %rax,(%rbx)