do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 413 Comm: syz-executor.0 Not tainted 5.4.265-syzkaller-04832-g4d7b888b5774 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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+0x24d4/0x6ae0 net/ipv4/nexthop.c:1518
Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 20 e8 a5 1e d3 fd 48 8b 44 24 20 4c 89 30 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 7e 1e d3 fd 48 8b 44 24 20 49 89 06
RSP: 0018:ffff8881d97a70a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881f5c02a00
RBP: ffff8881d97a74b0 R08: ffffffff82469408 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff1103b2f4e2c
R13: 0000000000010001 R14: 0000000000000000 R15: 1ffff1103b897704
FS:  00007f4ede7666c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ede765ff8 CR3: 00000001ef165000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5291
 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2481
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1915
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2304
 ___sys_sendmsg net/socket.c:2358 [inline]
 __sys_sendmsg+0x28b/0x380 net/socket.c:2404
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Modules linked in:
---[ end trace 55ced3001c4dd424 ]---
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+0x24d4/0x6ae0 net/ipv4/nexthop.c:1518
Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 20 e8 a5 1e d3 fd 48 8b 44 24 20 4c 89 30 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 7e 1e d3 fd 48 8b 44 24 20 49 89 06
RSP: 0018:ffff8881d97a70a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881f5c02a00
RBP: ffff8881d97a74b0 R08: ffffffff82469408 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff1103b2f4e2c
R13: 0000000000010001 R14: 0000000000000000 R15: 1ffff1103b897704
FS:  00007f4ede7666c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ede765ff8 CR3: 00000001ef165000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
   4:	74 0a                	je     0x10
   6:	48 8b 7c 24 20       	mov    0x20(%rsp),%rdi
   b:	e8 a5 1e d3 fd       	call   0xfdd31eb5
  10:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
  15:	4c 89 30             	mov    %r14,(%rax)
  18:	4c 89 f0             	mov    %r14,%rax
  1b:	48 c1 e8 03          	shr    $0x3,%rax
  1f:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  26:	fc ff df
* 29:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	4c 89 f7             	mov    %r14,%rdi
  32:	e8 7e 1e d3 fd       	call   0xfdd31eb5
  37:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
  3c:	49 89 06             	mov    %rax,(%r14)