======================================
| [ 207.759335][ T2478] #0: ffffffffa7059a30 (cb_lock){++++}-{3:3}, at: genl_rcv (net/netlink/genetlink.c:1219) 
| [ 207.759595][ T2478] #1: ffffffffa70026c8 (rtnl_mutex){+.+.}-{3:3}, at: netdev_nl_napi_set_doit (net/core/netdev-genl.c:350) 
| [  207.759895][ T2478]
| [  207.759895][ T2478] stack backtrace:
[  207.760375][ T2478] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  207.760572][ T2478] Call Trace:
[  207.760697][ T2478]  <TASK>
[ 207.760784][ T2478] dump_stack_lvl (lib/dump_stack.c:123) 
[ 207.760951][ T2478] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 207.761116][ T2478] napi_by_id (net/core/dev.c:6300 (discriminator 7)) 
[ 207.761241][ T2478] netdev_nl_napi_set_doit (net/core/netdev-genl.c:350) 
[ 207.761405][ T2478] ? __pfx_netdev_nl_napi_set_doit (net/core/netdev-genl.c:338) 
[ 207.761607][ T2478] ? __nla_parse (lib/nlattr.c:732) 
[ 207.761772][ T2478] ? genl_family_rcv_msg_attrs_parse.constprop.0 (net/netlink/genetlink.c:947) 
[ 207.762015][ T2478] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) 
[ 207.762177][ T2478] ? __pfx_genl_family_rcv_msg_doit (net/netlink/genetlink.c:1088) 
[ 207.762372][ T2478] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 207.762532][ T2478] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 207.762705][ T2478] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 207.762873][ T2478] genl_family_rcv_msg (net/netlink/genetlink.c:1195) 
[ 207.763035][ T2478] ? __pfx_genl_family_rcv_msg (net/netlink/genetlink.c:1160) 
[ 207.763196][ T2478] ? __pfx_netdev_nl_napi_set_doit (net/core/netdev-genl.c:338) 
[ 207.763407][ T2478] genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1211) 
[ 207.763573][ T2478] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 207.763732][ T2478] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) 
[ 207.763893][ T2478] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 207.764070][ T2478] ? genl_rcv (net/netlink/genetlink.c:1219) 
[ 207.764193][ T2478] ? __pfx_down_read (kernel/locking/rwsem.c:1522) 
[ 207.764355][ T2478] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 207.764531][ T2478] genl_rcv (net/netlink/genetlink.c:1220) 
[ 207.764654][ T2478] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 207.764817][ T2478] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 207.764980][ T2478] ? __wake_up (kernel/sched/wait.c:110 kernel/sched/wait.c:127) 
[ 207.765107][ T2478] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 207.765271][ T2478] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 207.765437][ T2478] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[ 207.765568][ T2478] __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2216) 
[ 207.765730][ T2478] ? __pfx___sys_sendto (net/socket.c:2186) 
[ 207.765888][ T2478] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 207.766064][ T2478] ? rseq_update_cpu_node_id (kernel/rseq.c:109 (discriminator 10)) 
[ 207.766225][ T2478] ? __rseq_handle_notify_resume (kernel/rseq.c:333) 
[ 207.766426][ T2478] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) 
[ 207.766637][ T2478] __x64_sys_sendto (net/socket.c:2224) 
[ 207.766800][ T2478] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 207.766999][ T2478] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 207.767162][ T2478] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  207.767363][ T2478] RIP: 0033:0x7f84db49b700
[ 207.767530][ T2478] Code: ff ff 64 89 02 eb bd 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 1d 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 68 c3 0f 1f 80 00 00 00 00 41 54 48 83 ec 20
All code
========
   0:	ff                   	(bad)
   1:	ff 64 89 02          	jmp    *0x2(%rcx,%rcx,4)
   5:	eb bd                	jmp    0xffffffffffffffc4
   7:	0f 1f 00             	nopl   (%rax)
   a:	f3 0f 1e fa          	endbr64
   e:	41 89 ca             	mov    %ecx,%r10d
  11:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  18:	00 
  19:	85 c0                	test   %eax,%eax
  1b:	75 1d                	jne    0x3a
  1d:	45 31 c9             	xor    %r9d,%r9d
  20:	45 31 c0             	xor    %r8d,%r8d
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 68                	ja     0x9a
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	41 54                	push   %r12
  3c:	48 83 ec 20          	sub    $0x20,%rsp

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 68                	ja     0x70
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	41 54                	push   %r12
  12:	48 83 ec 20          	sub    $0x20,%rsp
[  207.768083][ T2478] RSP: 002b:00007ffc76cb71f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[  207.768325][ T2478] RAX: ffffffffffffffda RBX: 00007ffc76cb7210 RCX: 00007f84db49b700
[  207.768565][ T2478] RDX: 0000000000000034 RSI: 00007f84db308270 RDI: 0000000000000005
[  207.768803][ T2478] RBP: 00007f84db308010 R08: 0000000000000000 R09: 0000000000000000
[  207.769040][ T2478] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000117162f0


Finger prints:
lockdep_rcu_suspicious:napi_by_id:netdev_nl_napi_set_doit:genl_family_rcv_msg_doit:genl_family_rcv_msg