======================================
| [   39.300433][    C3] 1 lock held by swapper/3/0:
| [ 39.300625][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   39.300946][    C3]
| [   39.300946][    C3] stack backtrace:
[   39.301310][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   39.301312][    C3] Call Trace:
[   39.301313][    C3]  <IRQ>
[ 39.301317][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 39.301326][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 39.301336][ C3] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 39.301344][ C3] ? 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) 
[ 39.301347][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 39.301352][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 39.301356][ C3] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 39.301362][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 39.301375][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 39.301378][ C3] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 39.301390][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 39.301394][ C3] ? 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) 
[ 39.301396][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 39.301406][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 39.301415][ C3] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 39.301420][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 39.301425][ C3] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 39.301440][ C3] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 39.301445][ C3] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 39.301452][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 39.301461][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 39.301471][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 39.301474][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 39.301478][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 39.301481][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 39.301484][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 39.301487][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 39.301505][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 39.301508][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 39.301518][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 39.301521][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 39.301530][ C3] ? 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) 
[ 39.301535][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 39.301540][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 39.301543][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 39.301552][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 39.301557][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 39.301570][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 39.301573][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 39.301576][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   39.301580][    C3]  </IRQ>
[   39.301581][    C3]  <TASK>
[ 39.301584][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 39.301589][ C3] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:744) 
[ 39.301593][ C3] 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
[   39.301596][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000242
[   39.301599][    C3] RAX: 00000000000b3179 RBX: 1ffff9200002efc1 RCX: ffffffffa6d14b15
[   39.301601][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa4569634
[   39.301603][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3703a
[   39.301604][    C3] R10: ffff8880361b81d3 R11: ffff888001b3a300 R12: 0000000000000000
[   39.301606][    C3] R13: ffff888001b3a300 R14: dffffc0000000000 R15: 0000000000000000
[ 39.301615][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 39.301620][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 39.301628][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 39.301631][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 39.301636][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 39.301643][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 39.301653][ C3] do_idle (kernel/sched/idle.c:325) 
[ 39.301659][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 39.301663][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 39.301668][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 39.301678][ C3] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [  100.101644][    C3] 1 lock held by swapper/3/0:
| [ 100.101969][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  100.102538][    C3]
| [  100.102538][    C3] stack backtrace:
[  100.102900][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  100.102903][    C3] Call Trace:
[  100.102906][    C3]  <IRQ>
[ 100.102911][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 100.102923][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 100.102938][ C3] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 100.102972][ C3] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 100.102987][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 100.102995][ C3] ? 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) 
[ 100.103001][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 100.103018][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 100.103030][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 100.103041][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 100.103046][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 100.103054][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 100.103060][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 100.103081][ C3] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 100.103094][ C3] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 100.103105][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 100.103122][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 100.103140][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 100.103145][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 100.103150][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 100.103154][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 100.103161][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 100.103166][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 100.103198][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 100.103204][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 100.103224][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 100.103229][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 100.103243][ C3] ? 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) 
[ 100.103254][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 100.103261][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 100.103266][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 100.103283][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 100.103293][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 100.103314][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 100.103320][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 100.103325][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  100.103332][    C3]  </IRQ>
[  100.103334][    C3]  <TASK>
[ 100.103339][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 100.103346][ C3] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:744) 
[ 100.103352][ C3] 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
[  100.103357][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000246
[  100.103362][    C3] RAX: 0000000000123e17 RBX: 1ffff9200002efc1 RCX: ffffffffa6d14b15
[  100.103365][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa4569634
[  100.103368][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3703a
[  100.103371][    C3] R10: ffff8880361b81d3 R11: ffff888001b3a300 R12: 0000000000000000
[  100.103374][    C3] R13: ffff888001b3a300 R14: dffffc0000000000 R15: 0000000000000000
[ 100.103391][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 100.103399][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 100.103413][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 100.103418][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 100.103426][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 100.103441][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 100.103457][ C3] do_idle (kernel/sched/idle.c:325) 
[ 100.103468][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 100.103475][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 100.103483][ C3] ? __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