======================================
| [ 3812.056312][    C1] 1 lock held by swapper/1/0:
| [ 3812.056476][ C1] #0: ffffc900001e0ae8 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [ 3812.056778][    C1]
| [ 3812.056778][    C1] stack backtrace:
[ 3812.056983][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3812.056986][    C1] Call Trace:
[ 3812.056989][    C1]  <IRQ>
[ 3812.056995][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3812.057010][ C1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 3812.057031][ C1] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 3812.057040][ C1] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 3812.057049][ C1] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 3812.057061][ C1] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 3812.057090][ C1] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 3812.057110][ C1] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 3812.057120][ 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) 
[ 3812.057128][ C1] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3812.057153][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 3812.057169][ C1] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 3812.057186][ C1] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 3812.057193][ C1] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 3812.057204][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 3812.057213][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 3812.057242][ C1] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 3812.057260][ C1] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 3812.057274][ C1] neigh_invalidate (net/core/neighbour.c:1008) 
[ 3812.057298][ C1] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 3812.057321][ C1] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3812.057330][ C1] call_timer_fn (kernel/time/timer.c:1789) 
[ 3812.057338][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3812.057345][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3812.057355][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 3812.057377][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3812.057408][ C1] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 3812.057418][ C1] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3812.057444][ C1] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 3812.057452][ C1] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 3812.057471][ 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) 
[ 3812.057482][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3812.057492][ C1] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 3812.057499][ C1] ? timer_expire_remote (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 3812.057525][ C1] timer_expire_remote (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 3812.057536][ C1] 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) 
[ 3812.057552][ C1] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:905) 
[ 3812.057561][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 3812.057570][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 3812.057619][ C1] tmigr_handle_remote_up (kernel/time/timer_migration.c:1038) 
[ 3812.057635][ C1] ? __pfx_tmigr_handle_remote_up (kernel/time/timer_migration.c:1005) 
[ 3812.057649][ C1] __walk_groups.isra.0 (kernel/time/timer_migration.c:533) 
[ 3812.057669][ C1] tmigr_handle_remote (kernel/time/timer_migration.c:1096) 
[ 3812.057680][ C1] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 3812.057687][ C1] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 3812.057693][ C1] ? ktime_get (kernel/time/timekeeping.c:226 (discriminator 4) kernel/time/timekeeping.c:335 (discriminator 4) kernel/time/timekeeping.c:752 (discriminator 4)) 
[ 3812.057711][ C1] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[ 3812.057745][ C1] handle_softirqs (kernel/softirq.c:561) 
[ 3812.057774][ C1] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 3812.057782][ C1] irq_exit_rcu (kernel/softirq.c:680) 
[ 3812.057789][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 3812.057800][    C1]  </IRQ>
[ 3812.057802][    C1]  <TASK>
[ 3812.057808][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3812.057816][ 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) 
[ 3812.057824][ 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 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
[ 3812.057830][    C1] RSP: 0018:ffffc90000157df8 EFLAGS: 00000246
[ 3812.057835][    C1] RAX: 000000000b0c16a9 RBX: 1ffff9200002afc1 RCX: ffffffff8d166b35
[ 3812.057840][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8a7733d4
[ 3812.057844][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da1703a
[ 3812.057848][    C1] R10: ffff88806d0b81d3 R11: ffff888001b0c5c0 R12: 0000000000000000
[ 3812.057852][    C1] R13: ffff888001b0c5c0 R14: dffffc0000000000 R15: 0000000000000000
[ 3812.057876][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 3812.057886][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3812.057904][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3812.057910][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3812.057919][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3812.057935][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 3812.057956][ C1] do_idle (kernel/sched/idle.c:325) 
[ 3812.057970][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3812.057979][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 3812.057990][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 3812.058017][ C1] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [ 3815.320542][    C0] 1 lock held by swapper/0/0:
| [ 3815.320752][ C0] #0: ffffc90000007d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [ 3815.321132][    C0]
| [ 3815.321132][    C0] stack backtrace:
[ 3815.321394][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 3815.321398][    C0] Call Trace:
[ 3815.321400][    C0]  <IRQ>
[ 3815.321405][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 3815.321420][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 3815.321441][ C0] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 3815.321459][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 3815.321473][ C0] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 3815.321483][ C0] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 3815.321492][ C0] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 3815.321505][ C0] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 3815.321512][ C0] ? start_dl_timer (kernel/sched/deadline.c:1193) 
[ 3815.321524][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 3815.321535][ C0] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 3815.321554][ C0] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 3815.321563][ C0] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 3815.321594][ C0] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 3815.321605][ 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) 
[ 3815.321613][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 3815.321637][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 3815.321661][ C0] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 3815.321675][ C0] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 3815.321686][ C0] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 3815.321721][ C0] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 3815.321736][ C0] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 3815.321751][ C0] neigh_invalidate (net/core/neighbour.c:1008) 
[ 3815.321775][ C0] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 3815.321798][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3815.321807][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 3815.321814][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3815.321821][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 3815.321832][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 3815.321854][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3815.321885][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 3815.321894][ C0] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 3815.321921][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 3815.321928][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 3815.321951][ 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) 
[ 3815.321962][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 3815.321972][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 3815.321979][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3815.322004][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 3815.322017][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 3815.322047][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 3815.322056][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 3815.322062][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 3815.322074][    C0]  </IRQ>
[ 3815.322077][    C0]  <TASK>
[ 3815.322083][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 3815.322091][ 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) 
[ 3815.322098][ 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
[ 3815.322104][    C0] RSP: 0018:ffffffff8de07e00 EFLAGS: 00000242
[ 3815.322109][    C0] RAX: 0000000004b00fa7 RBX: 1ffffffff1bc0fc2 RCX: ffffffff8d166b35
[ 3815.322114][    C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8a7733d4
[ 3815.322118][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100da0703a
[ 3815.322122][    C0] R10: ffff88806d0381d3 R11: ffffffff8de30fc0 R12: 0000000000000000
[ 3815.322127][    C0] R13: ffffffff8de30fc0 R14: dffffc0000000000 R15: 0000000000014770
[ 3815.322151][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 3815.322161][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3815.322176][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 3815.322197][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 3815.322200][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 3815.322207][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 3815.322217][ C0] do_idle (kernel/sched/idle.c:325) 
[ 3815.322222][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 3815.322226][ C0] rest_init (./include/linux/rcupdate.h:850 init/main.c:714) 
[ 3815.322232][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 3815.322239][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:503) 
[ 3815.322243][ 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