======================================
| [   68.356631][    C3] 1 lock held by swapper/3/0:
| [ 68.356805][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   68.357116][    C3]
| [   68.357116][    C3] stack backtrace:
[   68.357340][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   68.357345][    C3] Call Trace:
[   68.357348][    C3]  <IRQ>
[ 68.357356][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 68.357371][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 68.357394][ C3] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 68.357417][ C3] ? debug_object_activate (lib/debugobjects.c:837) 
[ 68.357435][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 68.357449][ C3] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 68.357460][ C3] ? debug_object_activate (lib/debugobjects.c:837) 
[ 68.357480][ C3] ? __pfx_debug_object_activate (lib/debugobjects.c:805) 
[ 68.357497][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 68.357503][ C3] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 68.357515][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 68.357518][ 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) 
[ 68.357522][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 68.357531][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 68.357540][ C3] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 68.357547][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 68.357553][ C3] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 68.357565][ C3] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 68.357571][ C3] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 68.357578][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 68.357587][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 68.357596][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 68.357600][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 68.357603][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 68.357606][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 68.357610][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 68.357613][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 68.357630][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 68.357634][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 68.357644][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 68.357647][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 68.357656][ 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) 
[ 68.357661][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 68.357666][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 68.357668][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 68.357678][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 68.357683][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 68.357696][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 68.357699][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 68.357702][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   68.357707][    C3]  </IRQ>
[   68.357708][    C3]  <TASK>
[ 68.357710][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 68.357716][ 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) 
[ 68.357721][ 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
[   68.357724][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000242
[   68.357727][    C3] RAX: 00000000001ae72f RBX: 1ffff9200002efc1 RCX: ffffffff9cf14b15
[   68.357729][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9a769634
[   68.357732][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005eb703a
[   68.357733][    C3] R10: ffff88802f5b81d3 R11: ffff888001b3a300 R12: 0000000000000000
[   68.357735][    C3] R13: ffff888001b3a300 R14: dffffc0000000000 R15: 0000000000000000
[ 68.357745][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 68.357749][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 68.357759][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 68.357762][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 68.357766][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 68.357773][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 68.357783][ C3] do_idle (kernel/sched/idle.c:325) 
[ 68.357791][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 68.357797][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 68.357804][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 68.357814][ C3] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   71.748216][    C1] 1 lock held by swapper/1/0:
| [ 71.748376][ C1] #0: ffffc900001e0d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   71.748685][    C1]
| [   71.748685][    C1] stack backtrace:
[   71.748894][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   71.748898][    C1] Call Trace:
[   71.748901][    C1]  <IRQ>
[ 71.748909][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 71.748925][ C1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 71.748947][ C1] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 71.748968][ C1] ? __pfx_debug_object_activate (lib/debugobjects.c:805) 
[ 71.749005][ C1] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 71.749027][ C1] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 71.749039][ C1] ? 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) 
[ 71.749046][ C1] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 71.749056][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 71.749062][ C1] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 71.749069][ C1] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 71.749072][ C1] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 71.749078][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 71.749081][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 71.749092][ C1] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 71.749101][ C1] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 71.749109][ C1] neigh_invalidate (net/core/neighbour.c:1008) 
[ 71.749118][ C1] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 71.749127][ C1] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 71.749131][ C1] call_timer_fn (kernel/time/timer.c:1789) 
[ 71.749135][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 71.749137][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 71.749142][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 71.749144][ C1] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 71.749162][ C1] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 71.749166][ C1] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 71.749176][ C1] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 71.749179][ C1] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 71.749189][ C1] ? 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) 
[ 71.749195][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 71.749200][ C1] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 71.749203][ C1] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 71.749212][ C1] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 71.749217][ C1] handle_softirqs (kernel/softirq.c:561) 
[ 71.749231][ C1] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 71.749234][ C1] irq_exit_rcu (kernel/softirq.c:680) 
[ 71.749237][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   71.749242][    C1]  </IRQ>
[   71.749243][    C1]  <TASK>
[ 71.749246][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 71.749251][ C1] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:744) 
[ 71.749255][ C1] 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
[   71.749258][    C1] RSP: 0018:ffffc90000157df8 EFLAGS: 00000246
[   71.749261][    C1] RAX: 00000000002842db RBX: 1ffff9200002afc1 RCX: ffffffff9cf14b15
[   71.749263][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9a769634
[   71.749265][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e9703a
[   71.749266][    C1] R10: ffff88802f4b81d3 R11: ffff88802f4ad670 R12: 0000000000000000
[   71.749268][    C1] R13: ffff888001b2c5c0 R14: dffffc0000000000 R15: 0000000000000000
[ 71.749278][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 71.749282][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 71.749291][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 71.749294][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 71.749298][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 71.749306][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 71.749316][ C1] do_idle (kernel/sched/idle.c:325) 
[ 71.749322][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 71.749327][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 71.749331][ C1] ? __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