======================================
| [   25.988857][    C0] 1 lock held by swapper/0/0:
| [ 25.989089][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   25.989541][    C0]
| [   25.989541][    C0] stack backtrace:
[   25.989823][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.989827][    C0] Call Trace:
[   25.989830][    C0]  <IRQ>
[ 25.989835][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.989850][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 25.989872][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 25.989887][ C0] ? update_sg_lb_stats.constprop.0 (kernel/sched/fair.c:10341) 
[ 25.989906][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 25.989916][ C0] ? update_sd_lb_stats.constprop.0 (kernel/sched/fair.c:11009) 
[ 25.989925][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 25.989931][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 25.989943][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 25.989947][ 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) 
[ 25.989951][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.989961][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 25.989970][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 25.989977][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 25.989982][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 25.989995][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 25.990000][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 25.990008][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 25.990017][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 25.990027][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 25.990030][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 25.990033][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 25.990035][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 25.990039][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 25.990042][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.990059][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 25.990063][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 25.990073][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 25.990076][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 25.990086][ 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) 
[ 25.990093][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 25.990097][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 25.990100][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 25.990109][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 25.990114][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 25.990127][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 25.990130][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 25.990133][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   25.990138][    C0]  </IRQ>
[   25.990139][    C0]  <TASK>
[ 25.990141][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.990147][ 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) 
[ 25.990152][ 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 23 cc 14 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 23 cc 14 00 	verw   0x14cc23(%rip)        # 0x14cc4b
  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
[   25.990155][    C0] RSP: 0018:ffffffff88e07e00 EFLAGS: 00000246
[   25.990158][    C0] RAX: 00000000000a141d RBX: 1ffffffff11c0fc2 RCX: ffffffff88114b15
[   25.990160][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85969634
[   25.990162][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c0703a
[   25.990163][    C0] R10: ffff8880360381d3 R11: ffffffff88e1cfc0 R12: 0000000000000000
[   25.990165][    C0] R13: ffffffff88e1cfc0 R14: dffffc0000000000 R15: 0000000000014770
[ 25.990175][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 25.990180][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.990188][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.990191][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.990195][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.990202][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 25.990212][ C0] do_idle (kernel/sched/idle.c:325) 
[ 25.990219][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.990223][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 25.990230][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 25.990240][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 25.990245][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 
[ 25.990250][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   30.660582][    C2] 1 lock held by swapper/2/0:
| [ 30.660873][ C2] #0: ffffc90000238d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   30.661248][    C2]
| [   30.661248][    C2] stack backtrace:
[   30.661499][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   30.661504][    C2] Call Trace:
[   30.661509][    C2]  <IRQ>
[ 30.661518][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 30.661530][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 30.661542][ C2] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 30.661552][ C2] ? __pfx_debug_object_activate (lib/debugobjects.c:805) 
[ 30.661566][ C2] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 30.661575][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 30.661580][ C2] ? 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) 
[ 30.661583][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 30.661593][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 30.661599][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 30.661605][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 30.661608][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 30.661614][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 30.661617][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 30.661628][ C2] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 30.661637][ C2] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 30.661644][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 30.661654][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 30.661664][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 30.661667][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 30.661671][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 30.661674][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 30.661678][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 30.661680][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 30.661697][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 30.661701][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 30.661711][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 30.661714][ C2] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 30.661724][ C2] ? 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) 
[ 30.661731][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 30.661736][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 30.661738][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 30.661748][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 30.661753][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 30.661766][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 30.661769][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 30.661772][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   30.661777][    C2]  </IRQ>
[   30.661778][    C2]  <TASK>
[ 30.661781][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 30.661786][ C2] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:744) 
[ 30.661791][ C2] 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 23 cc 14 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 23 cc 14 00 	verw   0x14cc23(%rip)        # 0x14cc4b
  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
[   30.661793][    C2] RSP: 0018:ffffc90000167df8 EFLAGS: 00000242
[   30.661797][    C2] RAX: 000000000007920b RBX: 1ffff9200002cfc1 RCX: ffffffff88114b15
[   30.661799][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85969634
[   30.661801][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2703a
[   30.661802][    C2] R10: ffff8880361381d3 R11: ffff888001b38040 R12: 0000000000000000
[   30.661804][    C2] R13: ffff888001b38040 R14: dffffc0000000000 R15: 0000000000000000
[ 30.661813][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 30.661817][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 30.661827][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 30.661830][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 30.661835][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 30.661842][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 30.661853][ C2] do_idle (kernel/sched/idle.c:325) 
[ 30.661860][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 30.661864][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 30.661868][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
lockdep_rcu_suspicious:__icmp_send:ipv4_send_dest_unreach:ipv4_link_failure:arp_error_report
lockdep_rcu_suspicious:icmp6_send:ip6_link_failure:ndisc_error_report:neigh_invalidate