======================================
| [   37.176852][    C2] 1 lock held by mausezahn/473:
| [ 37.177089][ C2] #0: ffffc90000238ae8 ((&n->timer)){+.-.}-{0:0}, at: call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
| [   37.177563][    C2]
| [   37.177563][    C2] stack backtrace:
[   37.177839][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   37.177841][    C2] Call Trace:
[   37.177843][    C2]  <IRQ>
[ 37.177845][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 37.177854][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 37.177864][ C2] icmp6_send (./include/net/net_namespace.h:404 ./include/linux/netdevice.h:2669 net/ipv6/icmp.c:476) 
[ 37.177870][ C2] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 37.177875][ C2] ? validate_chain (kernel/locking/lockdep.c:3799 kernel/locking/lockdep.c:3819 kernel/locking/lockdep.c:3874) 
[ 37.177880][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 37.177891][ C2] ? __pfx_icmp6_send (net/ipv6/icmp.c:452) 
[ 37.177900][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 37.177904][ 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) 
[ 37.177907][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 37.177916][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 37.177922][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 37.177929][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 37.177932][ C2] ? neigh_invalidate (net/core/neighbour.c:1008) 
[ 37.177937][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 37.177940][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 37.177952][ C2] ip6_link_failure (./include/linux/skbuff.h:1152 net/ipv6/route.c:2801) 
[ 37.177959][ C2] ndisc_error_report (./include/net/dst.h:429 net/ipv6/ndisc.c:731) 
[ 37.177966][ C2] neigh_invalidate (net/core/neighbour.c:1008) 
[ 37.177975][ C2] neigh_timer_handler (net/core/neighbour.c:1109 (discriminator 2)) 
[ 37.177984][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 37.177988][ C2] call_timer_fn (kernel/time/timer.c:1789) 
[ 37.177991][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 37.177994][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 37.177998][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 37.178000][ C2] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 37.178018][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 37.178021][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1032) 
[ 37.178031][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 37.178034][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 37.178041][ 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) 
[ 37.178047][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 37.178052][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 37.178054][ C2] ? timer_expire_remote (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 37.178064][ C2] timer_expire_remote (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2177) 
[ 37.178068][ 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) 
[ 37.178075][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:905) 
[ 37.178078][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 37.178082][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 37.178100][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1038) 
[ 37.178106][ C2] ? __pfx_tmigr_handle_remote_up (kernel/time/timer_migration.c:1005) 
[ 37.178111][ C2] __walk_groups.isra.0 (kernel/time/timer_migration.c:533) 
[ 37.178120][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:1096) 
[ 37.178124][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 37.178127][ C2] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 37.178131][ C2] ? ktime_get (kernel/time/timekeeping.c:226 (discriminator 4) kernel/time/timekeeping.c:335 (discriminator 4) kernel/time/timekeeping.c:752 (discriminator 4)) 
[ 37.178138][ C2] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[ 37.178151][ C2] handle_softirqs (kernel/softirq.c:561) 
[ 37.178162][ C2] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 37.178166][ C2] irq_exit_rcu (kernel/softirq.c:680) 
[ 37.178168][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   37.178172][    C2]  </IRQ>
[   37.178173][    C2]  <TASK>
[ 37.178176][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 37.178180][ C2] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 37.178184][ C2] 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 71 <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 71 	decl   %gs:0x71507d75(%rip)        # 0x71507d9f
  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
[   37.178187][    C2] RSP: 0018:ffffc90000a17660 EFLAGS: 00000286
[   37.178190][    C2] RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff20b1991
[   37.178192][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8eb34761
[   37.178194][    C2] RBP: ffffffff8fd4c140 R08: 0000000000000001 R09: 0000000000000001
[   37.178196][    C2] R10: ffffffff90591197 R11: ffff88800eb1c5c0 R12: ffff888002a8c580
[   37.178197][    C2] R13: 00000000000000e0 R14: 0000000000000001 R15: 0000000000000282
[ 37.178209][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 37.178217][ C2] __create_object (mm/kmemleak.c:766) 
[ 37.178227][ C2] kmem_cache_alloc_node_noprof (./include/linux/kmemleak.h:43 mm/slub.c:4119 mm/slub.c:4164 mm/slub.c:4216) 
[ 37.178239][ C2] __alloc_skb (net/core/skbuff.c:668) 
[ 37.178246][ C2] ? __pfx___alloc_skb (net/core/skbuff.c:651) 
[ 37.178249][ C2] ? ipv6_dev_get_saddr (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/ipv6/addrconf.c:1900) 
[ 37.178253][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 37.178266][ C2] alloc_skb_with_frags (./include/linux/skbuff.h:1331 net/core/skbuff.c:6612) 
[ 37.178274][ C2] ? ipv6_dev_get_saddr (net/ipv6/addrconf.c:1809) 
[ 37.178282][ C2] sock_alloc_send_pskb (net/core/sock.c:2899) 
[ 37.178286][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 37.178300][ C2] ? __pfx_sock_alloc_send_pskb (net/core/sock.c:2870) 
[ 37.178310][ C2] ? __pfx_xfrm_lookup_with_ifid (net/xfrm/xfrm_policy.c:3174) 
[ 37.178318][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 37.178325][ C2] rawv6_send_hdrinc (./include/net/sock.h:1804 net/ipv6/raw.c:614) 
[ 37.178337][ C2] ? __pfx_rawv6_send_hdrinc (net/ipv6/raw.c:596) 
[ 37.178343][ C2] ? ip6_dst_hoplimit.part.0.isra.0 (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/ipv6/output_core.c:117) 
[ 37.178355][ C2] rawv6_sendmsg (net/ipv6/raw.c:915) 
[ 37.178363][ C2] ? trace_raw_output_lock (./include/trace/events/lock.h:50 (discriminator 2)) 
[ 37.178371][ C2] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:741) 
[ 37.178377][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 37.178387][ C2] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 37.178395][ C2] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 37.178401][ C2] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 37.178404][ C2] ? __might_fault (mm/memory.c:6840 mm/memory.c:6833) 
[ 37.178418][ C2] ? __might_fault (mm/memory.c:6840 mm/memory.c:6833) 
[ 37.178423][ C2] ? __might_fault (mm/memory.c:6840 mm/memory.c:6833) 
[ 37.178432][ C2] ? __sys_sendto (net/socket.c:713 net/socket.c:728 net/socket.c:2182) 
[ 37.178437][ C2] __sys_sendto (net/socket.c:713 net/socket.c:728 net/socket.c:2182) 
[ 37.178443][ C2] ? __pfx___sys_sendto (net/socket.c:2149) 
[ 37.178446][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 37.178449][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 37.178461][ C2] ? rseq_update_cpu_node_id (kernel/rseq.c:188 (discriminator 10)) 
[ 37.178473][ C2] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:403) 
[ 37.178480][ C2] ? __pfx_task_work_run (kernel/task_work.c:195) 
[ 37.178493][ C2] __x64_sys_sendto (net/socket.c:2185) 
[ 37.178497][ C2] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 37.178502][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 37.178509][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   37.178512][    C2] RIP: 0033:0x7f71babcba4a
[ 37.178518][ C2] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[   37.178520][    C2] RSP: 002b:00007ffd24624048 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   37.178523][    C2] RAX: ffffffffffffffda RBX: 00000000037a59d0 RCX: 00007f71babcba4a
[   37.178525][    C2] RDX: 0000000000000070 RSI: 00000000037a5c70 RDI: 0000000000000005
[   37.178526][    C2] RBP: 00000000037a59d0 R08: 00007ffd24624050 R09: 000000000000001c
[   37.178528][    C2] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000070


Finger prints:
lockdep_rcu_suspicious:icmp6_send:ip6_link_failure:ndisc_error_report:neigh_invalidate