======================================
| [  287.308521][    C3] 1 lock held by swapper/3/0:
| [ 287.308790][ C3] #0: ffffc90000290ae8 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  287.309306][    C3]
| [  287.309306][    C3] stack backtrace:
[  287.309649][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  287.309655][    C3] Call Trace:
[  287.309658][    C3]  <IRQ>
[ 287.309665][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 287.309677][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 287.309694][ C3] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 287.309707][ C3] ? stack_depot_save_flags (lib/stackdepot.c:618) 
[ 287.309727][ C3] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 287.309739][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 287.309746][ C3] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 287.309755][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 287.309768][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 287.309772][ C3] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 287.309792][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 287.309799][ 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) 
[ 287.309804][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 287.309821][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 287.309837][ C3] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 287.309846][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 287.309855][ C3] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 287.309878][ C3] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 287.309887][ C3] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 287.309898][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 287.309915][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 287.309931][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 287.309937][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 287.309941][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 287.309945][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 287.309952][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 287.309956][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 287.309989][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 287.309995][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 287.310014][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 287.310018][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 287.310031][ 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) 
[ 287.310040][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 287.310048][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 287.310052][ C3] ? timer_expire_remote (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 287.310070][ C3] timer_expire_remote (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 287.310077][ C3] 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) 
[ 287.310088][ C3] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:905) 
[ 287.310094][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 287.310100][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 287.310134][ C3] tmigr_handle_remote_up (kernel/time/timer_migration.c:1038) 
[ 287.310145][ C3] ? __pfx_tmigr_handle_remote_up (kernel/time/timer_migration.c:1005) 
[ 287.310154][ C3] __walk_groups.isra.0 (kernel/time/timer_migration.c:533) 
[ 287.310170][ C3] tmigr_handle_remote (kernel/time/timer_migration.c:1096) 
[ 287.310178][ C3] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 287.310182][ C3] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 287.310189][ C3] ? ktime_get (kernel/time/timekeeping.c:226 (discriminator 4) kernel/time/timekeeping.c:335 (discriminator 4) kernel/time/timekeeping.c:752 (discriminator 4)) 
[ 287.310201][ C3] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[ 287.310225][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 287.310247][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 287.310253][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 287.310257][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  287.310265][    C3]  </IRQ>
[  287.310266][    C3]  <TASK>
[ 287.310271][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 287.310278][ 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) 
[ 287.310283][ 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
[  287.310288][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000242
[  287.310293][    C3] RAX: 000000000036df85 RBX: 1ffff9200002efc1 RCX: ffffffffba514b15
[  287.310297][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb7d69634
[  287.310299][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3703a
[  287.310302][    C3] R10: ffff8880361b81d3 R11: ffff8880361ad670 R12: 0000000000000000
[  287.310305][    C3] R13: ffff888001b3a300 R14: dffffc0000000000 R15: 0000000000000000
[ 287.310323][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 287.310330][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 287.310344][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 287.310348][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 287.310356][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 287.310369][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 287.310384][ C3] do_idle (kernel/sched/idle.c:325) 
[ 287.310396][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 287.310403][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 287.310410][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 287.310429][ C3] common_startup_64 (arch/x86/kernel/head_64.S:421) 
| [  296.779239][    C3] 1 lock held by swapper/3/0:
| [ 296.779401][ C3] #0: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [  296.779707][    C3]
| [  296.779707][    C3] stack backtrace:
[  296.779941][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  296.779945][    C3] Call Trace:
[  296.779948][    C3]  <IRQ>
[ 296.779956][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 296.779971][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 296.779993][ C3] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 296.780003][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 296.780020][ C3] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 296.780028][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 296.780033][ 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) 
[ 296.780036][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 296.780046][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 296.780053][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 296.780059][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 296.780062][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 296.780068][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 296.780071][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 296.780082][ C3] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 296.780091][ C3] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 296.780098][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 296.780107][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 296.780117][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 296.780121][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 296.780124][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 296.780126][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 296.780130][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 296.780133][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 296.780150][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 296.780154][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 296.780164][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 296.780166][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 296.780175][ 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) 
[ 296.780181][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 296.780186][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 296.780188][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 296.780198][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 296.780203][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 296.780215][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 296.780218][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 296.780220][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[  296.780226][    C3]  </IRQ>
[  296.780227][    C3]  <TASK>
[ 296.780229][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 296.780234][ 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) 
[ 296.780239][ 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
[  296.780242][    C3] RSP: 0018:ffffc90000177df8 EFLAGS: 00000242
[  296.780245][    C3] RAX: 0000000000384e75 RBX: 1ffff9200002efc1 RCX: ffffffffba514b15
[  296.780247][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb7d69634
[  296.780249][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3703a
[  296.780250][    C3] R10: ffff8880361b81d3 R11: ffff888001b3a300 R12: 0000000000000000
[  296.780252][    C3] R13: ffff888001b3a300 R14: dffffc0000000000 R15: 0000000000000000
[ 296.780261][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 296.780265][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 296.780274][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 296.780277][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 296.780282][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 296.780289][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 296.780299][ C3] do_idle (kernel/sched/idle.c:325) 
[ 296.780305][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 296.780309][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 296.780314][ 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