======================================
| xx__-> [  403.891067][ T3670] ==================================================================
| [ 403.891364][ T3670] BUG: KASAN: global-out-of-bounds in snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211) 
| [  403.891665][ T3670] Read of size 8 at addr ffffffff878e84b0 by task nstat/3670
| [  403.891917][ T3670]
[  403.892027][ T3670] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  403.892030][ T3670] Call Trace:
[  403.892032][ T3670]  <TASK>
[ 403.892034][ T3670] dump_stack_lvl (lib/dump_stack.c:123) 
[ 403.892043][ T3670] print_address_description.constprop.0 (mm/kasan/report.c:379) 
[ 403.892051][ T3670] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211) 
[ 403.892055][ T3670] print_report (mm/kasan/report.c:483) 
[ 403.892058][ T3670] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211) 
[ 403.892060][ T3670] ? kasan_addr_to_slab (./include/linux/mm.h:1180 mm/kasan/../slab.h:187 mm/kasan/common.c:38) 
[ 403.892064][ T3670] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211) 
[ 403.892067][ T3670] kasan_report (mm/kasan/report.c:597) 
[ 403.892071][ T3670] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211) 
[ 403.892076][ T3670] snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211) 
[ 403.892081][ T3670] ? sockstat6_seq_show (net/ipv6/proc.c:202) 
[ 403.892091][ T3670] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751) 
[ 403.892099][ T3670] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 21)) 
[ 403.892105][ T3670] ? __kvmalloc_node_noprof (mm/slub.c:5055) 
[ 403.892110][ T3670] snmp6_seq_show (net/ipv6/proc.c:224) 
[ 403.892113][ T3670] seq_read_iter (fs/seq_file.c:231) 
[ 403.892122][ T3670] seq_read (fs/seq_file.c:163) 
[ 403.892125][ T3670] ? seq_read_iter (fs/seq_file.c:152) 
[ 403.892129][ T3670] ? __might_fault (mm/memory.c:6958 mm/memory.c:6952) 
[ 403.892134][ T3670] ? __lock_release (kernel/locking/lockdep.c:5536) 
[ 403.892140][ T3670] ? __might_fault (mm/memory.c:6958 mm/memory.c:6952) 
[ 403.892145][ T3670] ? cp_old_stat (fs/stat.c:471) 
[ 403.892151][ T3670] proc_reg_read (fs/proc/inode.c:308 fs/proc/inode.c:320) 
[ 403.892158][ T3670] vfs_read (fs/read_write.c:570) 
[ 403.892163][ T3670] ? vfs_getattr_nosec (fs/stat.c:218) 
[ 403.892166][ T3670] ? kernel_read (fs/read_write.c:553) 
[ 403.892170][ T3670] ? __do_sys_newfstat (fs/stat.c:551) 
[ 403.892173][ T3670] ? __do_sys_fstat (fs/stat.c:551) 
[ 403.892179][ T3670] ksys_read (fs/read_write.c:715) 
[ 403.892182][ T3670] ? vfs_write (fs/read_write.c:705) 
[ 403.892188][ T3670] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 403.892193][ T3670] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  403.892196][ T3670] RIP: 0033:0x7f565ed1c292
[ 403.892201][ T3670] Code: c0 e9 b2 fe ff ff 50 48 8d 3d 6a 15 0c 00 e8 65 e1 01 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24
All code
========
   0:	c0 e9 b2             	shr    $0xb2,%cl
   3:	fe                   	(bad)
   4:	ff                   	(bad)
   5:	ff 50 48             	call   *0x48(%rax)
   8:	8d 3d 6a 15 0c 00    	lea    0xc156a(%rip),%edi        # 0xc1578
   e:	e8 65 e1 01 00       	call   0x1e178
  13:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  18:	f3 0f 1e fa          	endbr64
  1c:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  23:	00 
  24:	85 c0                	test   %eax,%eax
  26:	75 10                	jne    0x38
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 56                	ja     0x88
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	48 83 ec 28          	sub    $0x28,%rsp
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	54                   	push   %rsp
  3f:	24                   	.byte 0x24

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 56                	ja     0x5e
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	48 83 ec 28          	sub    $0x28,%rsp
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	54                   	push   %rsp
  15:	24                   	.byte 0x24
[  403.892204][ T3670] RSP: 002b:00007fffa3687038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[  403.892211][ T3670] RAX: ffffffffffffffda RBX: 0000000034607920 RCX: 00007f565ed1c292
[  403.892213][ T3670] RDX: 0000000000000400 RSI: 0000000034606500 RDI: 0000000000000006
[  403.892215][ T3670] RBP: 00007f565ee145c0 R08: 0000000000000006 R09: 0000000000000000
[  403.892216][ T3670] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000034607920


Finger prints:
print_report:kasan_report:snmp6_seq_show:seq_read_iter:seq_read