======================================
| [   18.257074][  T321] 1 lock held by teamd/321:
| [ 18.257237][ T321] #0: ffffffffb935b5c0 (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) 
| [   18.257553][  T321]
| [   18.257553][  T321] stack backtrace:
[   18.257770][  T321] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.257772][  T321] Call Trace:
[   18.257774][  T321]  <TASK>
[ 18.257776][ T321] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.257783][ T321] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 18.257794][ T321] 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) 
[ 18.257804][ T321] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631) 
[ 18.257819][ T321] ? __pfx___dev_queue_xmit (net/core/dev.c:4538) 
[ 18.257823][ T321] ? packet_parse_headers (./include/linux/skbuff.h:3108 net/packet/af_packet.c:1992) 
[ 18.257831][ T321] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2922) 
[ 18.257837][ T321] ? __pfx_packet_parse_headers (net/packet/af_packet.c:1977) 
[ 18.257842][ T321] ? skb_copy_datagram_from_iter (net/core/datagram.c:564) 
[ 18.257848][ T321] ? packet_cached_dev_get (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/packet/af_packet.c:295) 
[ 18.257857][ T321] packet_snd (net/packet/af_packet.c:3131) 
[ 18.257872][ T321] ? __pfx_packet_snd (net/packet/af_packet.c:2995) 
[ 18.257878][ T321] ? build_sched_domains (kernel/sched/cpupri.c:313 kernel/sched/topology.c:478 kernel/sched/topology.c:1500 kernel/sched/topology.c:2539) 
[ 18.257886][ T321] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 18.257890][ T321] ? __might_fault (mm/memory.c:6858 mm/memory.c:6851) 
[ 18.257896][ T321] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 18.257905][ T321] __sys_sendto (net/socket.c:709 net/socket.c:724 net/socket.c:2177) 
[ 18.257911][ T321] ? __pfx___sys_sendto (net/socket.c:2144) 
[ 18.257913][ T321] ? __might_fault (mm/memory.c:6858 mm/memory.c:6851) 
[ 18.257928][ T321] ? __sys_getsockname (net/socket.c:2091) 
[ 18.257932][ T321] ? __pfx___sys_getsockname (net/socket.c:2070) 
[ 18.257937][ T321] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2077 arch/x86/mm/physaddr.c:65) 
[ 18.257945][ T321] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4639) 
[ 18.257950][ T321] ? trace_rcu_segcb_stats (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:570 ./include/linux/cpumask.h:1116 ./include/trace/events/rcu.h:537) 
[ 18.257959][ T321] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4639) 
[ 18.257963][ T321] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 18.257971][ T321] __x64_sys_sendto (net/socket.c:2180) 
[ 18.257975][ T321] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 18.257980][ T321] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 18.257988][ T321] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   18.257992][  T321] RIP: 0033:0x7fa5a4c618f0
[ 18.257997][ T321] 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
[   18.258000][  T321] RSP: 002b:00007fff6c253f08 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   18.258004][  T321] RAX: ffffffffffffffda RBX: 000000000b0092d0 RCX: 00007fa5a4c618f0
[   18.258006][  T321] RDX: 000000000000007c RSI: 00007fff6c253f80 RDI: 0000000000000006
[   18.258008][  T321] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   18.258009][  T321] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000007c


Finger prints:
lockdep_rcu_suspicious:dev_hard_start_xmit:__dev_queue_xmit:packet_snd:__sys_sendto