======================================
| [ 63.590567][ C3] #0: ffffffffadd4c0e8 (scan_mutex){+.+.}-{4:4}, at: kmemleak_scan_thread (mm/kmemleak.c:1868 (discriminator 2)) 
| [ 63.590883][ C3] #1: ffffc90000290d60 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   63.591185][    C3]
| [   63.591185][    C3] stack backtrace:
[   63.591394][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   63.591396][    C3] Call Trace:
[   63.591398][    C3]  <IRQ>
[ 63.591402][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 63.591409][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 63.591420][ C3] __icmp_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv4/icmp.c:616) 
[ 63.591434][ C3] ? __pfx___icmp_send (net/ipv4/icmp.c:596) 
[ 63.591441][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 63.591444][ C3] ? debug_object_activate (lib/debugobjects.c:837) 
[ 63.591457][ C3] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 63.591461][ C3] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 63.591473][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 63.591477][ 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) 
[ 63.591480][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 63.591490][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 63.591499][ C3] ipv4_send_dest_unreach (net/ipv4/route.c:1241) 
[ 63.591504][ C3] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 63.591510][ C3] ? __pfx_ipv4_send_dest_unreach (net/ipv4/route.c:1215) 
[ 63.591522][ C3] ipv4_link_failure (./include/linux/skbuff.h:1152 ./include/net/route.h:88 net/ipv4/route.c:1250) 
[ 63.591528][ C3] arp_error_report (./include/net/dst.h:429 net/ipv4/arp.c:296) 
[ 63.591535][ C3] neigh_invalidate (net/core/neighbour.c:1008) 
[ 63.591544][ C3] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 63.591554][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 63.591557][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 63.591560][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 63.591563][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 63.591567][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 63.591570][ 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) 
[ 63.591578][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 63.591589][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 63.591592][ C3] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 63.591602][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 63.591605][ C3] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 63.591614][ 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) 
[ 63.591620][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 63.591625][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 63.591627][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 63.591637][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 63.591642][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 63.591654][ C3] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 63.591657][ C3] irq_exit_rcu (kernel/softirq.c:680) 
[ 63.591659][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   63.591664][    C3]  </IRQ>
[   63.591665][    C3]  <TASK>
[ 63.591667][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 63.591671][ C3] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 63.591675][ C3] Code: 10 e8 81 74 88 fd 48 89 ef e8 c9 e4 88 fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 75 7d 50 53 <74> 0e 5b 5d c3 cc cc cc cc e8 8f 03 ae fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	81 74 88 fd 48 89 ef 	xorl   $0xe8ef8948,-0x3(%rax,%rcx,4)
   9:	e8 
   a:	c9                   	leave
   b:	e4 88                	in     $0x88,%al
   d:	fd                   	std
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 75 7d 50 53 	decl   %gs:0x53507d75(%rip)        # 0x53507d9f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 8f 03 ae fd       	call   0xfffffffffdae03c7
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 8f 03 ae fd       	call   0xfffffffffdae039d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   63.591678][    C3] RSP: 0018:ffffc900004a7db8 EFLAGS: 00000286
[   63.591681][    C3] RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff5f8825a
[   63.591682][    C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffacb34761
[   63.591684][    C3] RBP: ffff888001052620 R08: 0000000000000001 R09: fffffbfff5f843e9
[   63.591686][    C3] R10: ffffffffafc21f4f R11: ffff888008e0c5c0 R12: 0000000000000246
[   63.591687][    C3] R13: ffffffffad6f4470 R14: dead000000000100 R15: ffff888001052678
[ 63.591699][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 63.591707][ C3] scan_object (mm/kmemleak.c:1581) 
[ 63.591715][ C3] scan_gray_list (mm/kmemleak.c:1615) 
[ 63.591723][ C3] kmemleak_scan (./include/linux/rcupdate.h:847 mm/kmemleak.c:1771) 
[ 63.591727][ C3] ? __pfx_kmemleak_scan_thread (mm/kmemleak.c:1848) 
[ 63.591734][ C3] kmemleak_scan_thread (mm/kmemleak.c:1869 (discriminator 2)) 
[ 63.591738][ C3] kthread (kernel/kthread.c:464) 
[ 63.591744][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 63.591753][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 63.591760][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 63.591764][ C3] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
lockdep_rcu_suspicious:__icmp_send:ipv4_send_dest_unreach:ipv4_link_failure:arp_error_report