======================================
| [  396.916408][    C0] 1 lock held by swapper/0/0:
| [ 396.916640][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  396.917061][    C0]
| [  396.917061][    C0] stack backtrace:
[  396.917347][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  396.917351][    C0] Call Trace:
[  396.917354][    C0]  <IRQ>
[ 396.917359][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 396.917374][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 396.917396][ C0] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 396.917407][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 396.917419][ C0] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 396.917450][ C0] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 396.917470][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 396.917482][ 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) 
[ 396.917489][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 396.917515][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 396.917532][ C0] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 396.917549][ C0] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 396.917557][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 396.917568][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 396.917578][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 396.917608][ C0] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 396.917626][ C0] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 396.917641][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 396.917665][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 396.917690][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 396.917699][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 396.917706][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 396.917714][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 396.917724][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 396.917747][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 396.917780][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 396.917789][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 396.917816][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 396.917824][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 396.917847][ 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) 
[ 396.917858][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 396.917868][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 396.917875][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 396.917901][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 396.917915][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 396.917945][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 396.917954][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 396.917961][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  396.917972][    C0]  </IRQ>
[  396.917975][    C0]  <TASK>
[ 396.917981][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 396.917989][ 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) 
[ 396.917997][ 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
[  396.918003][    C0] RSP: 0018:ffffffff8d607e00 EFLAGS: 00000242
[  396.918009][    C0] RAX: 0000000000901b01 RBX: 1ffffffff1ac0fc2 RCX: ffffffff8c966b35
[  396.918014][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff89f733d4
[  396.918018][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da0703a
[  396.918022][    C0] R10: ffff88806d0381d3 R11: ffffffff8d630fc0 R12: 0000000000000000
[  396.918026][    C0] R13: ffffffff8d630fc0 R14: dffffc0000000000 R15: 0000000000014770
[ 396.918037][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 396.918042][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 396.918049][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 396.918052][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 396.918055][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 396.918062][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 396.918072][ C0] do_idle (kernel/sched/idle.c:325) 
[ 396.918078][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 396.918081][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 396.918088][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 396.918095][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 396.918099][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 
[ 396.918104][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [  400.179759][    C3] 1 lock held by swapper/3/0:
| [ 400.179941][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  400.180295][    C3]
| [  400.180295][    C3] stack backtrace:
[  400.180521][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  400.180525][    C3] Call Trace:
[  400.180528][    C3]  <IRQ>
[ 400.180536][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 400.180553][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 400.180576][ C3] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 400.180596][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 400.180610][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 400.180620][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 400.180630][ C3] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 400.180643][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 400.180651][ C3] ? start_dl_timer (kernel/sched/deadline.c:1193) 
[ 400.180664][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 400.180675][ C3] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 400.180696][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 400.180706][ C3] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 400.180738][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 400.180749][ 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) 
[ 400.180756][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 400.180782][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 400.180806][ C3] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 400.180822][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 400.180834][ C3] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 400.180870][ C3] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 400.180885][ C3] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 400.180901][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 400.180925][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 400.180950][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 400.180959][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 400.180967][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 400.180974][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 400.180985][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 400.181007][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 400.181039][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 400.181049][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 400.181076][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 400.181084][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 400.181109][ 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) 
[ 400.181120][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 400.181130][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 400.181137][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 400.181163][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 400.181176][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 400.181208][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 400.181217][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 400.181223][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  400.181236][    C3]  </IRQ>
[  400.181239][    C3]  <TASK>
[ 400.181245][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 400.181254][ 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) 
[ 400.181262][ 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 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
[  400.181268][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000242
[  400.181274][    C3] RAX: 000000000099defb RBX: 1ffff9200002efc1 RCX: ffffffff8c966b35
[  400.181279][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff89f733d4
[  400.181283][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da3703a
[  400.181287][    C3] R10: ffff88806d1b81d3 R11: ffff888001bda300 R12: 0000000000000000
[  400.181292][    C3] R13: ffff888001bda300 R14: dffffc0000000000 R15: 0000000000000000
[ 400.181317][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 400.181327][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 400.181344][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 400.181350][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 400.181360][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 400.181377][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 400.181400][ C3] do_idle (kernel/sched/idle.c:325) 
[ 400.181414][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 400.181424][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 400.181435][ 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