======================================
| [  272.773092][    C0] 1 lock held by swapper/0/0:
| [ 272.773322][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  272.773707][    C0]
| [  272.773707][    C0] stack backtrace:
[  272.773971][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  272.773975][    C0] Call Trace:
[  272.773978][    C0]  <IRQ>
[ 272.773982][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 272.773996][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 272.774019][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 272.774039][ C0] ? update_sd_lb_stats.constprop.0 (kernel/sched/fair.c:11009) 
[ 272.774049][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 272.774056][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 272.774062][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 272.774072][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 272.774075][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 272.774087][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 272.774091][ 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) 
[ 272.774094][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 272.774105][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 272.774113][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 272.774120][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 272.774126][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 272.774139][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 272.774144][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 272.774152][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 272.774161][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 272.774171][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 272.774174][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 272.774177][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 272.774179][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 272.774183][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 272.774186][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 272.774204][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 272.774207][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 272.774217][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 272.774220][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 272.774230][ 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) 
[ 272.774237][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 272.774242][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 272.774244][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 272.774254][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 272.774259][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 272.774273][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 272.774276][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 272.774279][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  272.774284][    C0]  </IRQ>
[  272.774285][    C0]  <TASK>
[ 272.774288][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 272.774293][ 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) 
[ 272.774297][ 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
[  272.774300][    C0] RSP: 0018:ffffffff85c07e00 EFLAGS: 00000246
[  272.774304][    C0] RAX: 00000000003fbb41 RBX: 1ffffffff0b80fc2 RCX: ffffffff84f14b15
[  272.774306][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff82769634
[  272.774308][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005e8703a
[  272.774309][    C0] R10: ffff88802f4381d3 R11: ffff88802f42d670 R12: 0000000000000000
[  272.774311][    C0] R13: ffffffff85c1cfc0 R14: dffffc0000000000 R15: 0000000000014770
[ 272.774321][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 272.774326][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 272.774335][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 272.774338][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 272.774342][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 272.774349][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 272.774360][ C0] do_idle (kernel/sched/idle.c:325) 
[ 272.774366][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 272.774371][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 272.774377][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 272.774387][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 272.774393][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 
[ 272.774398][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [  282.180666][    C2] 1 lock held by swapper/2/0:
| [ 282.180857][ C2] #0: ffffc90000238ae8 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  282.181188][    C2]
| [  282.181188][    C2] stack backtrace:
[  282.181427][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  282.181432][    C2] Call Trace:
[  282.181435][    C2]  <IRQ>
[ 282.181443][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 282.181458][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 282.181481][ C2] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 282.181494][ C2] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 282.181504][ C2] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 282.181516][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 282.181546][ C2] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 282.181568][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 282.181579][ 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) 
[ 282.181587][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 282.181612][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 282.181628][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 282.181645][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 282.181652][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 282.181663][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 282.181672][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 282.181702][ C2] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 282.181720][ C2] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 282.181736][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 282.181761][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 282.181785][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 282.181794][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 282.181802][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 282.181808][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 282.181819][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 282.181826][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 282.181873][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 282.181882][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 282.181910][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 282.181917][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 282.181937][ 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) 
[ 282.181951][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 282.181963][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 282.181970][ C2] ? timer_expire_remote (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 282.181996][ C2] timer_expire_remote (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 282.182007][ C2] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:147 kernel/time/timer_migration.c:961) 
[ 282.182023][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:905) 
[ 282.182031][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 282.182040][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 282.182090][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1038) 
[ 282.182106][ C2] ? __pfx_tmigr_handle_remote_up (kernel/time/timer_migration.c:1005) 
[ 282.182119][ C2] __walk_groups.isra.0 (kernel/time/timer_migration.c:533) 
[ 282.182144][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:1096) 
[ 282.182154][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 282.182160][ C2] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 282.182170][ C2] ? ktime_get (kernel/time/timekeeping.c:226 (discriminator 4) kernel/time/timekeeping.c:335 (discriminator 4) kernel/time/timekeeping.c:752 (discriminator 4)) 
[ 282.182188][ C2] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[ 282.182223][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 282.182253][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 282.182261][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 282.182268][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  282.182278][    C2]  </IRQ>
[  282.182280][    C2]  <TASK>
[ 282.182286][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 282.182295][ 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) 
[ 282.182304][ 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 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
[  282.182310][    C2] RSP: 0018:ffffc90000167df8 EFLAGS: 00000246
[  282.182316][    C2] RAX: 0000000000434edd RBX: 1ffff9200002cfc1 RCX: ffffffff84f14b15
[  282.182321][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff82769634
[  282.182325][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ea703a
[  282.182329][    C2] R10: ffff88802f5381d3 R11: ffff888001b38040 R12: 0000000000000000
[  282.182333][    C2] R13: ffff888001b38040 R14: dffffc0000000000 R15: 0000000000000000
[ 282.182358][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 282.182370][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 282.182390][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 282.182397][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 282.182409][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 282.182428][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 282.182451][ C2] do_idle (kernel/sched/idle.c:325) 
[ 282.182468][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 282.182479][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 282.182490][ 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