======================================
| [   25.351980][    C0] 1 lock held by swapper/0/0:
| [ 25.352334][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   25.352991][    C0]
| [   25.352991][    C0] stack backtrace:
[   25.353453][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.353456][    C0] Call Trace:
[   25.353459][    C0]  <IRQ>
[ 25.353463][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.353477][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 25.353495][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 25.353513][ C0] ? debug_object_activate (lib/debugobjects.c:837) 
[ 25.353526][ C0] ? 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) 
[ 25.353536][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 25.353544][ C0] ? debug_object_activate (lib/debugobjects.c:837) 
[ 25.353567][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 25.353575][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 25.353597][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 25.353604][ 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) 
[ 25.353610][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.353628][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 25.353644][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 25.353654][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 25.353663][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 25.353686][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 25.353696][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 25.353708][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 25.353726][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 25.353744][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 25.353750][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 25.353758][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 25.353762][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 25.353769][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 25.353774][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.353804][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 25.353809][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 25.353828][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 25.353832][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 25.353849][ 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) 
[ 25.353858][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 25.353865][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 25.353870][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 25.353888][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 25.353896][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 25.353921][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 25.353927][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 25.353931][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   25.353938][    C0]  </IRQ>
[   25.353940][    C0]  <TASK>
[ 25.353945][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.353952][ 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) 
[ 25.353959][ 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
[   25.353963][    C0] RSP: 0018:ffffffffb1e07e00 EFLAGS: 00000246
[   25.353968][    C0] RAX: 000000000009a199 RBX: 1ffffffff63c0fc2 RCX: ffffffffb1114b15
[   25.353971][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffae969634
[   25.353974][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ec703a
[   25.353977][    C0] R10: ffff88802f6381d3 R11: ffffffffb1e1cfc0 R12: 0000000000000000
[   25.353980][    C0] R13: ffffffffb1e1cfc0 R14: dffffc0000000000 R15: 0000000000014770
[ 25.353998][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 25.354005][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.354018][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.354023][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.354031][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.354044][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 25.354061][ C0] do_idle (kernel/sched/idle.c:325) 
[ 25.354073][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.354081][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 25.354092][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 25.354106][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 25.354115][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 
[ 25.354123][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [   28.741145][    C3] 1 lock held by swapper/3/0:
| [ 28.741317][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   28.741643][    C3]
| [   28.741643][    C3] stack backtrace:
[   28.741854][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   28.741858][    C3] Call Trace:
[   28.741860][    C3]  <IRQ>
[ 28.741866][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.741877][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 28.741887][ C3] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 28.741908][ C3] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 28.741917][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 28.741921][ 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) 
[ 28.741924][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 28.741934][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 28.741940][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 28.741947][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 28.741950][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 28.741956][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 28.741959][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 28.741970][ C3] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 28.741980][ C3] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 28.741988][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 28.741997][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 28.742006][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 28.742010][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 28.742013][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 28.742016][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 28.742020][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 28.742022][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 28.742040][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 28.742043][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 28.742053][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 28.742056][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 28.742066][ 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) 
[ 28.742072][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 28.742076][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 28.742079][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 28.742089][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 28.742093][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 28.742107][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 28.742110][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 28.742113][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   28.742118][    C3]  </IRQ>
[   28.742119][    C3]  <TASK>
[ 28.742122][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 28.742126][ 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) 
[ 28.742131][ 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
[   28.742134][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000246
[   28.742137][    C3] RAX: 00000000000740bd RBX: 1ffff9200002efc1 RCX: ffffffffb1114b15
[   28.742139][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffae969634
[   28.742141][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ef703a
[   28.742142][    C3] R10: ffff88802f7b81d3 R11: ffff888001b3a300 R12: 0000000000000000
[   28.742144][    C3] R13: ffff888001b3a300 R14: dffffc0000000000 R15: 0000000000000000
[ 28.742154][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 28.742158][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.742168][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 28.742171][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.742175][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 28.742182][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 28.742192][ C3] do_idle (kernel/sched/idle.c:325) 
[ 28.742199][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 28.742204][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 28.742208][ 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