======================================
| [ 12.090332][ T264] #0: ffff8880066f4858 (&po->pg_vec_lock){+.+.}-{4:4}, at: tpacket_snd (net/packet/af_packet.c:2795) 
| [ 12.090659][ T264] #1: ffffffff87b6f640 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:901 net/core/dev.c:4555) 
| [   12.090970][  T264]
| [   12.090970][  T264] stack backtrace:
[   12.091181][  T264] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.091183][  T264] Call Trace:
[   12.091184][  T264]  <TASK>
[ 12.091187][ T264] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.091195][ T264] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 12.091206][ T264] dev_hard_start_xmit (./include/net/net_namespace.h:418 ./include/linux/netdevice.h:2695 net/core/dev.c:2466 net/core/dev.c:3772 net/core/dev.c:3793) 
[ 12.091218][ T264] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631) 
[ 12.091228][ T264] ? __pfx_packet_parse_headers (net/packet/af_packet.c:1977) 
[ 12.091233][ T264] ? sock_alloc_send_pskb (net/core/sock.c:2952) 
[ 12.091237][ T264] ? skb_store_bits (net/core/skbuff.c:3375) 
[ 12.091244][ T264] ? __pfx___dev_queue_xmit (net/core/dev.c:4538) 
[ 12.091255][ T264] ? tpacket_fill_skb (net/packet/af_packet.c:2699) 
[ 12.091276][ T264] tpacket_snd (net/packet/af_packet.c:2929) 
[ 12.091300][ T264] ? __pfx_tpacket_snd (net/packet/af_packet.c:2771) 
[ 12.091304][ T264] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 12.091322][ T264] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2177) 
[ 12.091329][ T264] ? __pfx___sys_sendto (net/socket.c:2144) 
[ 12.091331][ T264] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 12.091345][ T264] ? __pfx_timespec64_add_safe (kernel/time/time.c:848) 
[ 12.091351][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 12.091356][ T264] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 12.091360][ T264] ? ktime_get_ts64 (kernel/time/timekeeping.c:226 (discriminator 4) kernel/time/timekeeping.c:335 (discriminator 4) kernel/time/timekeeping.c:893 (discriminator 4)) 
[ 12.091374][ T264] ? __x64_sys_poll (fs/select.c:1076 fs/select.c:1062 fs/select.c:1062) 
[ 12.091380][ T264] ? __pfx___x64_sys_poll (fs/select.c:1062) 
[ 12.091389][ T264] __x64_sys_sendto (net/socket.c:2180) 
[ 12.091394][ T264] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 12.091398][ T264] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 12.091406][ T264] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   12.091410][  T264] RIP: 0033:0x7f91e515aa4a
[ 12.091415][ T264] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  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 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   12.091417][  T264] RSP: 002b:00007ffc56f138e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   12.091421][  T264] RAX: ffffffffffffffda RBX: 0000000000000800 RCX: 00007f91e515aa4a
[   12.091423][  T264] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
[   12.091425][  T264] RBP: 0000008e0000008e R08: 0000000000000000 R09: 0000000000000000
[   12.091427][  T264] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006


Finger prints:
lockdep_rcu_suspicious:dev_hard_start_xmit:__dev_queue_xmit:tpacket_snd:__sys_sendto