======================================
| [ 3269.851694][    C0] 1 lock held by swapper/0/0:
| [ 3269.851928][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [ 3269.852374][    C0]
| [ 3269.852374][    C0] stack backtrace:
[ 3269.852669][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3269.852672][    C0] Call Trace:
[ 3269.852674][    C0]  <IRQ>
[ 3269.852677][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3269.852687][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 3269.852699][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 3269.852714][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 3269.852719][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 3269.852727][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 3269.852734][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 3269.852743][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 3269.852746][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 3269.852759][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 3269.852763][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 3269.852766][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3269.852776][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 3269.852786][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 3269.852793][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 3269.852800][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 3269.852814][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 3269.852820][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 3269.852827][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 3269.852837][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 3269.852846][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3269.852850][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 3269.852854][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3269.852856][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3269.852861][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 3269.852864][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3269.852883][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 3269.852887][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3269.852897][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 3269.852900][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 3269.852910][ C0] ? 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) 
[ 3269.852915][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3269.852919][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 3269.852922][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3269.852932][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3269.852938][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 3269.852951][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 3269.852954][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 3269.852957][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 3269.852962][    C0]  </IRQ>
[ 3269.852963][    C0]  <TASK>
[ 3269.852966][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3269.852971][ C0] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:744) 
[ 3269.852975][ C0] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 03 ac 0f 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 03 ac 0f 00 	verw   0xfac03(%rip)        # 0xfac2b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[ 3269.852978][    C0] RSP: 0018:ffffffff93807e00 EFLAGS: 00000246
[ 3269.852982][    C0] RAX: 0000000005a527b7 RBX: 1ffffffff2700fc2 RCX: ffffffff92b66b35
[ 3269.852984][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff901733d4
[ 3269.852985][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da0703a
[ 3269.852987][    C0] R10: ffff88806d0381d3 R11: ffffffff93830fc0 R12: 0000000000000000
[ 3269.852989][    C0] R13: ffffffff93830fc0 R14: dffffc0000000000 R15: 0000000000014770
[ 3269.852999][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 3269.853003][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3269.853010][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3269.853013][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3269.853017][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3269.853023][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 3269.853035][ C0] do_idle (kernel/sched/idle.c:325) 
[ 3269.853041][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3269.853044][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 3269.853051][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 3269.853059][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 3269.853063][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 


Finger prints:
lockdep_rcu_suspicious:__icmp_send:ipv4_send_dest_unreach:ipv4_link_failure:arp_error_report