======================================
| [   56.218606][    C2] 1 lock held by swapper/2/0:
| [ 56.218806][ C2] #0: ffffc90000238d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   56.219170][    C2]
| [   56.219170][    C2] stack backtrace:
[   56.219418][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   56.219421][    C2] Call Trace:
[   56.219425][    C2]  <IRQ>
[ 56.219432][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 56.219450][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 56.219473][ C2] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 56.219491][ C2] ? update_sg_lb_stats.constprop.0 (kernel/sched/fair.c:10341) 
[ 56.219520][ C2] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 56.219535][ C2] ? update_sd_lb_stats.constprop.0 (kernel/sched/fair.c:11009) 
[ 56.219543][ C2] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 56.219549][ C2] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 56.219562][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 56.219566][ 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) 
[ 56.219570][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 56.219580][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 56.219590][ C2] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 56.219598][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 56.219604][ C2] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 56.219619][ C2] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 56.219625][ C2] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 56.219632][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 56.219642][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 56.219651][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 56.219655][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 56.219658][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 56.219661][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 56.219665][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 56.219668][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 56.219687][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 56.219691][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 56.219702][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 56.219704][ C2] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 56.219717][ 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) 
[ 56.219722][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 56.219726][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 56.219729][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 56.219739][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 56.219745][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 56.219759][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 56.219763][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 56.219766][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   56.219773][    C2]  </IRQ>
[   56.219774][    C2]  <TASK>
[ 56.219776][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 56.219782][ 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) 
[ 56.219787][ 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
[   56.219790][    C2] RSP: 0018:ffffc90000167df8 EFLAGS: 00000246
[   56.219793][    C2] RAX: 0000000000085739 RBX: 1ffff9200002cfc1 RCX: ffffffff88166b35
[   56.219795][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff857733d4
[   56.219797][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da2703a
[   56.219799][    C2] R10: ffff88806d1381d3 R11: ffff888001bd8040 R12: 0000000000000000
[   56.219801][    C2] R13: ffff888001bd8040 R14: dffffc0000000000 R15: 0000000000000000
[ 56.219811][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 56.219815][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 56.219822][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 56.219825][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 56.219829][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 56.219835][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 56.219847][ C2] do_idle (kernel/sched/idle.c:325) 
[ 56.219852][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 56.219856][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 56.219860][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 56.219871][ C2] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [ 3511.706114][    C3] 1 lock held by swapper/3/0:
| [ 3511.706277][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [ 3511.706582][    C3]
| [ 3511.706582][    C3] stack backtrace:
[ 3511.706795][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3511.706799][    C3] Call Trace:
[ 3511.706802][    C3]  <IRQ>
[ 3511.706810][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3511.706827][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 3511.706850][ C3] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 3511.706870][ C3] ? update_sd_lb_stats.constprop.0 (kernel/sched/fair.c:11009) 
[ 3511.706901][ C3] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 3511.706921][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 3511.706932][ 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) 
[ 3511.706940][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3511.706966][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 3511.706983][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 3511.707000][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 3511.707008][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 3511.707020][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 3511.707029][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 3511.707060][ C3] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 3511.707079][ C3] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 3511.707094][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 3511.707118][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 3511.707143][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3511.707152][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 3511.707160][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3511.707167][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3511.707178][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 3511.707186][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3511.707234][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 3511.707243][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3511.707271][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 3511.707278][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 3511.707303][ 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) 
[ 3511.707315][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3511.707325][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 3511.707332][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3511.707358][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3511.707372][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 3511.707403][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 3511.707412][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 3511.707419][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 3511.707430][    C3]  </IRQ>
[ 3511.707432][    C3]  <TASK>
[ 3511.707438][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3511.707448][ 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) 
[ 3511.707455][ 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
[ 3511.707461][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000242
[ 3511.707468][    C3] RAX: 0000000001a8e157 RBX: 1ffff9200002efc1 RCX: ffffffff88166b35
[ 3511.707472][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff857733d4
[ 3511.707477][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da3703a
[ 3511.707481][    C3] R10: ffff88806d1b81d3 R11: ffff888001bda300 R12: 0000000000000000
[ 3511.707485][    C3] R13: ffff888001bda300 R14: dffffc0000000000 R15: 0000000000000000
[ 3511.707510][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 3511.707520][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3511.707538][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3511.707545][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3511.707561][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3511.707568][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 3511.707580][ C3] do_idle (kernel/sched/idle.c:325) 
[ 3511.707585][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3511.707589][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3511.707594][ 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