======================================
| [  132.120547][    C2] 1 lock held by swapper/2/0:
| [ 132.120723][ C2] #0: ffffc90000238d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  132.121035][    C2]
| [  132.121035][    C2] stack backtrace:
[  132.121257][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  132.121260][    C2] Call Trace:
[  132.121264][    C2]  <IRQ>
[ 132.121270][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 132.121285][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 132.121307][ C2] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 132.121317][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 132.121329][ C2] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 132.121360][ C2] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 132.121380][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 132.121391][ 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) 
[ 132.121399][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 132.121425][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 132.121441][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 132.121459][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 132.121466][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 132.121477][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 132.121486][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 132.121516][ C2] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 132.121535][ C2] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 132.121549][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 132.121574][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 132.121598][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 132.121607][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 132.121615][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 132.121622][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 132.121633][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 132.121655][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 132.121687][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 132.121697][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 132.121724][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 132.121732][ C2] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 132.121755][ 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) 
[ 132.121766][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 132.121776][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 132.121783][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 132.121809][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 132.121823][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 132.121861][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 132.121864][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 132.121867][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  132.121874][    C2]  </IRQ>
[  132.121875][    C2]  <TASK>
[ 132.121877][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 132.121882][ 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) 
[ 132.121885][ 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
[  132.121888][    C2] RSP: 0018:ffffc90000167df8 EFLAGS: 00000242
[  132.121892][    C2] RAX: 0000000000310b3d RBX: 1ffff9200002cfc1 RCX: ffffffff88166b35
[  132.121894][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff857733d4
[  132.121896][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da2703a
[  132.121897][    C2] R10: ffff88806d1381d3 R11: ffff888001bd8040 R12: 0000000000000000
[  132.121899][    C2] R13: ffff888001bd8040 R14: dffffc0000000000 R15: 0000000000000000
[ 132.121909][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 132.121913][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 132.121921][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 132.121923][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 132.121927][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 132.121933][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 132.121943][ C2] do_idle (kernel/sched/idle.c:325) 
[ 132.121949][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 132.121952][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 132.121957][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 132.121968][ C2] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [  135.384649][    C0] 1 lock held by swapper/0/0:
| [ 135.384874][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  135.385262][    C0]
| [  135.385262][    C0] stack backtrace:
[  135.385530][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  135.385533][    C0] Call Trace:
[  135.385537][    C0]  <IRQ>
[ 135.385541][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 135.385556][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 135.385578][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 135.385601][ C0] ? get_nohz_timer_target (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/rcupdate.h:1161 kernel/sched/core.c:1187) 
[ 135.385617][ C0] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 135.385626][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 135.385640][ C0] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 135.385647][ C0] ? start_dl_timer (kernel/sched/deadline.c:1193) 
[ 135.385659][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 135.385669][ C0] ? __hrtimer_start_range_ns (kernel/time/hrtimer.c:1261) 
[ 135.385691][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 135.385700][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 135.385732][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 135.385742][ 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) 
[ 135.385750][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 135.385776][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 135.385800][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 135.385814][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 135.385825][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 135.385861][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 135.385877][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 135.385892][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 135.385916][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 135.385940][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 135.385949][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 135.385957][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 135.385964][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 135.385975][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 135.385997][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 135.386030][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 135.386039][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 135.386067][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 135.386074][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 135.386097][ 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) 
[ 135.386108][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 135.386118][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 135.386125][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 135.386151][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 135.386165][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 135.386196][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 135.386204][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 135.386211][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  135.386223][    C0]  </IRQ>
[  135.386226][    C0]  <TASK>
[ 135.386232][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 135.386240][ 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) 
[ 135.386248][ 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
[  135.386253][    C0] RSP: 0018:ffffffff88e07e00 EFLAGS: 00000246
[  135.386259][    C0] RAX: 0000000000322d2b RBX: 1ffffffff11c0fc2 RCX: ffffffff88166b35
[  135.386264][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff857733d4
[  135.386268][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da0703a
[  135.386272][    C0] R10: ffff88806d0381d3 R11: ffffffff88e30fc0 R12: 0000000000000000
[  135.386277][    C0] R13: ffffffff88e30fc0 R14: dffffc0000000000 R15: 0000000000014770
[ 135.386302][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 135.386312][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 135.386328][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 135.386334][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 135.386343][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 135.386360][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 135.386383][ C0] do_idle (kernel/sched/idle.c:325) 
[ 135.386397][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 135.386407][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 135.386422][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 135.386437][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 135.386446][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:445 (discriminator 17)) 


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