======================================
| [ 4219.766354][    C1] rcu_scheduler_active = 2, debug_locks = 1
| [ 4219.766732][    C1] no locks held by mausezahn/20773.
| [ 4219.766987][    C1]
| [ 4219.766987][    C1] stack backtrace:
[ 4219.767318][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 4219.767321][    C1] Call Trace:
[ 4219.767323][    C1]  <IRQ>
[ 4219.767325][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 4219.767339][ C1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[ 4219.767352][ C1] veth_xdp_rcv (drivers/net/veth.c:907 (discriminator 9)) 
[ 4219.767362][ C1] ? switch_hrtimer_base (kernel/time/hrtimer.c:232 kernel/time/hrtimer.c:258) 
[ 4219.767375][ C1] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:899) 
[ 4219.767381][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 4219.767388][ C1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 4219.767395][ C1] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[ 4219.767402][ C1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 4219.767409][ C1] veth_poll (drivers/net/veth.c:977) 
[ 4219.767413][ C1] ? __pfx_veth_poll (drivers/net/veth.c:965) 
[ 4219.767416][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 4219.767426][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 4219.767431][ C1] ? debug_object_activate (lib/debugobjects.c:837) 
[ 4219.767436][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 4219.767443][ C1] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 4219.767448][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 4219.767456][ C1] ? debug_object_activate (lib/debugobjects.c:837) 
[ 4219.767466][ C1] __napi_poll.constprop.0 (net/core/dev.c:7383) 
[ 4219.767473][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 4219.767480][ C1] net_rx_action (net/core/dev.c:7447 net/core/dev.c:7569) 
[ 4219.767491][ C1] ? __pfx_net_rx_action (net/core/dev.c:7531) 
[ 4219.767503][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 4219.767506][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 4219.767511][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 4219.767515][ C1] ? note_gp_changes (kernel/rcu/tree.c:1330 (discriminator 31)) 
[ 4219.767519][ C1] ? handle_softirqs (./arch/x86/include/asm/preempt.h:27 kernel/softirq.c:426 kernel/softirq.c:607) 
[ 4219.767532][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 4219.767538][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:908 net/core/dev.c:4710) 
[ 4219.767543][ C1] do_softirq (kernel/softirq.c:480 kernel/softirq.c:467) 
[ 4219.767547][    C1]  </IRQ>
[ 4219.767548][    C1]  <TASK>
[ 4219.767549][ C1] __local_bh_enable_ip (kernel/softirq.c:407) 
[ 4219.767553][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:908 net/core/dev.c:4710) 
[ 4219.767555][ C1] __dev_queue_xmit (net/core/dev.c:4711) 
[ 4219.767558][ C1] ? _copy_from_iter (./arch/x86/include/asm/uaccess_64.h:126 ./arch/x86/include/asm/uaccess_64.h:141 lib/iov_iter.c:55 ./include/linux/iov_iter.h:30 ./include/linux/iov_iter.h:300 ./include/linux/iov_iter.h:328 lib/iov_iter.c:249 lib/iov_iter.c:260) 
[ 4219.767563][ C1] ? page_cache_async_ra (mm/readahead.c:677) 
[ 4219.767574][ C1] ? __pfx___dev_queue_xmit (net/core/dev.c:4591) 
[ 4219.767578][ C1] ? packet_parse_headers (./include/linux/skbuff.h:3109 net/packet/af_packet.c:1992) 
[ 4219.767589][ C1] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2923) 
[ 4219.767597][ C1] ? __pfx_packet_parse_headers (net/packet/af_packet.c:1977) 
[ 4219.767602][ C1] ? skb_copy_datagram_from_iter (net/core/datagram.c:563) 
[ 4219.767615][ C1] packet_snd (net/packet/af_packet.c:3131) 
[ 4219.767629][ C1] ? __pfx_packet_snd (net/packet/af_packet.c:2995) 
[ 4219.767634][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 4219.767642][ C1] ? __might_fault (mm/memory.c:7151 mm/memory.c:7145) 
[ 4219.767652][ C1] __sys_sendto (net/socket.c:712 net/socket.c:727 net/socket.c:2180) 
[ 4219.767659][ C1] ? __pfx___sys_sendto (net/socket.c:2147) 
[ 4219.767672][ C1] ? sock_ioctl (net/socket.c:1314) 
[ 4219.767679][ C1] ? __pfx___up_read (kernel/locking/rwsem.c:1337) 
[ 4219.767683][ C1] ? do_user_addr_fault (./include/linux/mmap_lock.h:212 arch/x86/mm/fault.c:1416) 
[ 4219.767696][ C1] ? do_user_addr_fault (./include/linux/mmap_lock.h:212 arch/x86/mm/fault.c:1416) 
[ 4219.767702][ C1] __x64_sys_sendto (net/socket.c:2183) 
[ 4219.767706][ C1] ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:198 arch/x86/entry/syscall_64.c:90) 
[ 4219.767711][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 4219.767715][ C1] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 4219.767719][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4219.767724][    C1] RIP: 0033:0x7fa267897a4a
[ 4219.767729][ C1] 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
[ 4219.767732][    C1] RSP: 002b:00007ffec8afc9a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 4219.767753][    C1] RAX: ffffffffffffffda RBX: 00000000130749d0 RCX: 00007fa267897a4a
[ 4219.767755][    C1] RDX: 000000000000002a RSI: 0000000013074c92 RDI: 0000000000000006
[ 4219.767757][    C1] RBP: 0000000013074c92 R08: 00007ffec8afc9b0 R09: 0000000000000014
[ 4219.767759][    C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


Finger prints:
lockdep_rcu_suspicious:veth_xdp_rcv:veth_poll:net_rx_action:handle_softirqs