======================================
| [ 1026.559095][    C1] rcu_scheduler_active = 2, debug_locks = 1
| [ 1026.559485][    C1] no locks held by udpgso_bench_tx/14016.
| [ 1026.559758][    C1]
| [ 1026.559758][    C1] stack backtrace:
[ 1026.560086][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1026.560088][    C1] Call Trace:
[ 1026.560090][    C1]  <IRQ>
[ 1026.560092][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1026.560102][ C1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[ 1026.560112][ C1] veth_xdp_rcv (drivers/net/veth.c:907 (discriminator 9)) 
[ 1026.560119][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 1026.560125][ C1] ? trace_pelt_se_tp (./include/trace/events/sched.h:796 (discriminator 21)) 
[ 1026.560129][ C1] ? __update_load_avg_se (kernel/sched/pelt.c:314) 
[ 1026.560138][ C1] ? __pfx_veth_xdp_rcv (drivers/net/veth.c:899) 
[ 1026.560145][ C1] ? place_entity (kernel/sched/fair.c:5206) 
[ 1026.560149][ C1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 1026.560156][ C1] ? enqueue_entity (kernel/sched/fair.c:5362) 
[ 1026.560168][ C1] veth_poll (drivers/net/veth.c:977) 
[ 1026.560172][ C1] ? __pfx_veth_poll (drivers/net/veth.c:965) 
[ 1026.560181][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 1026.560187][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 1026.560191][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 1026.560198][ C1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 1026.560200][ C1] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[ 1026.560204][ C1] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[ 1026.560211][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 1026.560222][ C1] __napi_poll.constprop.0 (net/core/dev.c:7413) 
[ 1026.560226][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 1026.560232][ C1] net_rx_action (net/core/dev.c:7477 net/core/dev.c:7599) 
[ 1026.560244][ C1] ? __pfx_net_rx_action (net/core/dev.c:7561) 
[ 1026.560249][ C1] ? _raw_spin_unlock_irq (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202) 
[ 1026.560255][ C1] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:202) 
[ 1026.560264][ C1] ? run_timer_softirq (kernel/time/timer.c:2446) 
[ 1026.560268][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 1026.560272][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 1026.560280][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 1026.560288][ C1] ? inet_wait_for_connect (net/ipv4/af_inet.c:610) 
[ 1026.560294][ C1] do_softirq (kernel/softirq.c:480 kernel/softirq.c:467) 
[ 1026.560298][    C1]  </IRQ>
[ 1026.560299][    C1]  <TASK>
[ 1026.560300][ C1] __local_bh_enable_ip (kernel/softirq.c:407) 
[ 1026.560305][ C1] inet_wait_for_connect (net/ipv4/af_inet.c:610) 
[ 1026.560311][ C1] ? __pfx_inet_wait_for_connect (net/ipv4/af_inet.c:597) 
[ 1026.560316][ C1] ? __pfx_woken_wake_function (kernel/sched/wait.c:439) 
[ 1026.560321][ C1] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 1026.560326][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 1026.560334][ C1] __inet_stream_connect (net/ipv4/af_inet.c:703 (discriminator 1)) 
[ 1026.560341][ C1] ? __pfx_inet_stream_connect (net/ipv4/af_inet.c:744) 
[ 1026.560344][ C1] inet_stream_connect (net/ipv4/af_inet.c:749) 
[ 1026.560349][ C1] __sys_connect (net/socket.c:2038 net/socket.c:2057) 
[ 1026.560354][ C1] ? __pfx___sys_connect (net/socket.c:2045) 
[ 1026.560357][ C1] ? fd_install (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 fs/file.c:661) 
[ 1026.560364][ C1] ? fd_install (./arch/x86/include/asm/preempt.h:104 ./include/linux/rcupdate.h:955 fs/file.c:661) 
[ 1026.560369][ C1] ? __sys_socket (net/socket.c:503 net/socket.c:1692) 
[ 1026.560374][ C1] ? __pfx___sys_socket (net/socket.c:1679) 
[ 1026.560384][ C1] __x64_sys_connect (net/socket.c:2060) 
[ 1026.560387][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 1026.560390][ C1] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 1026.560396][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1026.560399][    C1] RIP: 0033:0x7f2dd7c395c7
[ 1026.560404][ C1] Code: 0a 00 f7 d8 64 89 02 b8 ff ff ff ff eb bc 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 18 89 54 24 0c 48 89 34 24 89
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
   c:	eb bc                	jmp    0xffffffffffffffca
   e:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2a 00 00 00       	mov    $0x2a,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 18          	sub    $0x18,%rsp
  37:	89 54 24 0c          	mov    %edx,0xc(%rsp)
  3b:	48 89 34 24          	mov    %rsi,(%rsp)
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 18          	sub    $0x18,%rsp
   d:	89 54 24 0c          	mov    %edx,0xc(%rsp)
  11:	48 89 34 24          	mov    %rsi,(%rsp)
  15:	89                   	.byte 0x89
[ 1026.560407][    C1] RSP: 002b:00007ffcdeb48bf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[ 1026.560411][    C1] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f2dd7c395c7
[ 1026.560413][    C1] RDX: 000000000000001c RSI: 0000000000a450e0 RDI: 0000000000000005
[ 1026.560415][    C1] RBP: 00007ffcdeb48d40 R08: 00007ffcdeb48b50 R09: 0000000000000000
[ 1026.560417][    C1] R10: 00007f2dd7af1598 R11: 0000000000000246 R12: 0000000000000005


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