======================================
| [   54.551964][    C0] 1 lock held by swapper/0/0:
| [ 54.552173][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   54.552554][    C0]
| [   54.552554][    C0] stack backtrace:
[   54.552812][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   54.552815][    C0] Call Trace:
[   54.552818][    C0]  <IRQ>
[ 54.552823][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 54.552837][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 54.552859][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 54.552876][ C0] ? update_sg_lb_stats.constprop.0 (kernel/sched/fair.c:10341) 
[ 54.552904][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 54.552932][ C0] ? update_sd_lb_stats.constprop.0 (kernel/sched/fair.c:11009) 
[ 54.552949][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 54.552958][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 54.552989][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 54.552999][ 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) 
[ 54.553007][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 54.553032][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 54.553055][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 54.553070][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 54.553081][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 54.553109][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 54.553115][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 54.553137][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 54.553147][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 54.553157][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 54.553161][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 54.553164][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 54.553167][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 54.553172][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 54.553175][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 54.553193][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 54.553197][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 54.553208][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 54.553211][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 54.553222][ 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) 
[ 54.553226][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 54.553230][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 54.553233][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 54.553243][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 54.553249][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 54.553262][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 54.553265][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 54.553268][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   54.553273][    C0]  </IRQ>
[   54.553274][    C0]  <TASK>
[ 54.553277][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 54.553282][ 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) 
[ 54.553285][ 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
[   54.553288][    C0] RSP: 0018:ffffffffafc07e00 EFLAGS: 00000242
[   54.553292][    C0] RAX: 00000000000a1f9b RBX: 1ffffffff5f80fc2 RCX: ffffffffaef66b35
[   54.553294][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffac5733d4
[   54.553295][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da0703a
[   54.553297][    C0] R10: ffff88806d0381d3 R11: ffff88806d02d670 R12: 0000000000000000
[   54.553299][    C0] R13: ffffffffafc30fc0 R14: dffffc0000000000 R15: 0000000000014770
[ 54.553309][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 54.553313][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 54.553319][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 54.553322][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 54.553326][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 54.553332][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 54.553342][ C0] do_idle (kernel/sched/idle.c:325) 
[ 54.553348][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 54.553352][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 54.553358][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 54.553365][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 54.553369][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 
[ 54.553374][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [ 3422.616013][    C2] 1 lock held by swapper/2/0:
| [ 3422.616186][ C2] #0: ffffc90000238d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [ 3422.616493][    C2]
| [ 3422.616493][    C2] stack backtrace:
[ 3422.616710][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3422.616714][    C2] Call Trace:
[ 3422.616717][    C2]  <IRQ>
[ 3422.616723][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3422.616738][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 3422.616759][ C2] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 3422.616777][ C2] ? update_sd_lb_stats.constprop.0 (kernel/sched/fair.c:11009) 
[ 3422.616805][ C2] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 3422.616824][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 3422.616834][ 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) 
[ 3422.616842][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3422.616865][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 3422.616881][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 3422.616897][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 3422.616903][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 3422.616915][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 3422.616924][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 3422.616952][ C2] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 3422.616969][ C2] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 3422.616982][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 3422.617005][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 3422.617028][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3422.617036][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 3422.617043][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3422.617050][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3422.617060][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 3422.617067][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3422.617111][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 3422.617120][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3422.617146][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 3422.617152][ C2] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 3422.617175][ 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) 
[ 3422.617186][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3422.617195][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 3422.617202][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3422.617226][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3422.617238][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 3422.617267][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 3422.617275][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 3422.617281][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 3422.617292][    C2]  </IRQ>
[ 3422.617294][    C2]  <TASK>
[ 3422.617300][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3422.617309][ 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) 
[ 3422.617317][ 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 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
[ 3422.617322][    C2] RSP: 0018:ffffc90000167df8 EFLAGS: 00000242
[ 3422.617328][    C2] RAX: 0000000001c05a7f RBX: 1ffff9200002cfc1 RCX: ffffffffaef66b35
[ 3422.617332][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffac5733d4
[ 3422.617337][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da2703a
[ 3422.617340][    C2] R10: ffff88806d1381d3 R11: ffff888001bd8040 R12: 0000000000000000
[ 3422.617344][    C2] R13: ffff888001bd8040 R14: dffffc0000000000 R15: 0000000000000000
[ 3422.617367][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 3422.617377][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3422.617393][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3422.617399][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3422.617408][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3422.617424][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 3422.617446][ C2] do_idle (kernel/sched/idle.c:325) 
[ 3422.617460][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3422.617468][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3422.617479][ 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