======================================
| [   74.111247][  T639] ==================================================================
| [   74.111583][  T639] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   74.111878][  T639] Read of size 1 at addr ffff888008d316ac by task ip/639
| [   74.112161][  T639]
[   74.112262][  T639] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   74.112265][  T639] Call Trace:
[   74.112267][  T639]  <TASK>
[   74.112270][  T639]  dump_stack_lvl (lib/dump_stack.c:123)
[   74.112277][  T639]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   74.112285][  T639]  ? kobject_put (lib/kobject.c:733)
[   74.112289][  T639]  print_report (mm/kasan/report.c:483)
[   74.112292][  T639]  ? kobject_put (lib/kobject.c:733)
[   74.112296][  T639]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   74.112302][  T639]  ? kobject_put (lib/kobject.c:733)
[   74.112306][  T639]  kasan_report (mm/kasan/report.c:597)
[   74.112311][  T639]  ? kobject_put (lib/kobject.c:733)
[   74.112320][  T639]  kobject_put (lib/kobject.c:733)
[   74.112325][  T639]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   74.112332][  T639]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   74.112337][  T639]  ? generic_xdp_install (net/core/dev.c:11630)
[   74.112340][  T639]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   74.112346][  T639]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   74.112354][  T639]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   74.112360][  T639]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.112379][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.112387][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.112394][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.112398][  T639]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   74.112401][  T639]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.112405][  T639]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.112409][  T639]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   74.112412][  T639]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.112415][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.112423][  T639]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   74.112429][  T639]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.112432][  T639]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   74.112439][  T639]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   74.112442][  T639]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[   74.112445][  T639]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   74.112449][  T639]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   74.112453][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.112459][  T639]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   74.112464][  T639]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.112468][  T639]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   74.112475][  T639]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.112479][  T639]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   74.112486][  T639]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   74.112489][  T639]  ? __copy_msghdr (net/socket.c:2556)
[   74.112497][  T639]  ___sys_sendmsg (net/socket.c:2686)
[   74.112500][  T639]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   74.112503][  T639]  ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3125)
[   74.112513][  T639]  ? copy_msghdr_from_user (net/socket.c:2673)
[   74.112518][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.112523][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.112528][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.112532][  T639]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   74.112540][  T639]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.112546][  T639]  __sys_sendmsg (net/socket.c:2716)
[   74.112550][  T639]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   74.112554][  T639]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   74.112561][  T639]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   74.112565][  T639]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   74.112572][  T639]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   74.112577][  T639] RIP: 0033:0x7f782d20c1d7
[   74.112583][  T639] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   74.112586][  T639] RSP: 002b:00007ffdd57b59b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   74.112591][  T639] RAX: ffffffffffffffda RBX: 00007ffdd57b60e0 RCX: 00007f782d20c1d7
[   74.112593][  T639] RDX: 0000000000000000 RSI: 00007ffdd57b5a20 RDI: 0000000000000005
[   74.112595][  T639] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   74.112596][  T639] R10: 00007f782d108f60 R11: 0000000000000246 R12: 0000000000000002
[   74.112599][  T639] R13: 00000000690ded2d R14: 0000000000499600 R15: 0000000000000000
| [   74.146152][  T639] refcount_t: underflow; use-after-free.
| [   74.146503][  T639] WARNING: CPU: 3 PID: 639 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   74.147165][  T639] Modules linked in: act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q vrf veth
| [   74.148478][  T639] Tainted: [B]=BAD_PAGE
[   74.148715][  T639] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   74.149148][  T639] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   74.149551][  T639] Code: 7d 93 02 80 fb 01 0f 87 bb 99 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 a8 7d 93 02 01 90 48 c7 c7 60 8d 85 93 e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
All code
========
   0:	7d 93                	jge    0xffffffffffffff95
   2:	02 80 fb 01 0f 87    	add    -0x78f0fe05(%rax),%al
   8:	bb 99 d9 fe 83       	mov    $0x83fed999,%ebx
   d:	e3 01                	jrcxz  0x10
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 a8 7d 93 02 01 	movb   $0x1,0x2937da8(%rip)        # 0x2937dc4
  1c:	90                   	nop
  1d:	48 c7 c7 60 8d 85 93 	mov    $0xffffffff93858d60,%rdi
  24:	e8 32 bf 18 ff       	call   0xffffffffff18bf5b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	e9 33 ff ff ff       	jmp    0xffffffffffffff66
  33:	48 89 df             	mov    %rbx,%rdi
  36:	e8 b0 63 a1 ff       	call   0xffffffffffa163eb
  3b:	e9 ba fe ff ff       	jmp    0xfffffffffffffefa

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	e9 33 ff ff ff       	jmp    0xffffffffffffff3c
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 b0 63 a1 ff       	call   0xffffffffffa163c1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   74.150837][  T639] RSP: 0000:ffffc90000f0f1f0 EFLAGS: 00010286
[   74.151282][  T639] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   74.151726][  T639] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   74.152201][  T639] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff283e134
[   74.152659][  T639] R10: 0000000000000003 R11: ffffc90000f0ed80 R12: 0000000000000001
[   74.153306][  T639] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   74.153792][  T639] FS:  00007f782d03e800(0000) GS:ffff8880a0d72000(0000) knlGS:0000000000000000
[   74.154564][  T639] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   74.155176][  T639] CR2: 00007f782d3f1b30 CR3: 000000000a419006 CR4: 0000000000772ef0
[   74.155828][  T639] PKRU: 55555554
[   74.156081][  T639] Call Trace:
[   74.156334][  T639]  <TASK>
[   74.156482][  T639]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   74.156771][  T639]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   74.157087][  T639]  ? generic_xdp_install (net/core/dev.c:11630)
[   74.157380][  T639]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   74.157676][  T639]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   74.158269][  T639]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   74.158590][  T639]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.159007][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.159294][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.159578][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.160062][  T639]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   74.160633][  T639]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.161180][  T639]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.161596][  T639]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   74.161923][  T639]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.162264][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.162810][  T639]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   74.163163][  T639]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.163474][  T639]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   74.163772][  T639]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   74.164268][  T639]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[   74.164562][  T639]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   74.164868][  T639]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   74.165179][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.165674][  T639]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   74.165994][  T639]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.166297][  T639]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   74.166654][  T639]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.167174][  T639]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   74.167484][  T639]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   74.167863][  T639]  ? __copy_msghdr (net/socket.c:2556)
[   74.168397][  T639]  ___sys_sendmsg (net/socket.c:2686)
[   74.168722][  T639]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   74.169044][  T639]  ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3125)
[   74.169434][  T639]  ? copy_msghdr_from_user (net/socket.c:2673)
[   74.169912][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.170233][  T639]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.170541][  T639]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.170842][  T639]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   74.171355][  T639]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.171665][  T639]  __sys_sendmsg (net/socket.c:2716)
[   74.172025][  T639]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   74.172406][  T639]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   74.172953][  T639]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   74.173301][  T639]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   74.173603][  T639]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   74.173998][  T639] RIP: 0033:0x7f782d20c1d7
[   74.174503][  T639] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   74.175843][  T639] RSP: 002b:00007ffdd57b59b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   74.176381][  T639] RAX: ffffffffffffffda RBX: 00007ffdd57b60e0 RCX: 00007f782d20c1d7
[   74.176853][  T639] RDX: 0000000000000000 RSI: 00007ffdd57b5a20 RDI: 0000000000000005
[   74.177538][  T639] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   74.178001][  T639] R10: 00007f782d108f60 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
print_report:kasan_report:kobject_put:netdev_run_todo:rtnl_dellink
refcount_warn_saturate:netdev_run_todo:rtnl_dellink:rtnetlink_rcv_msg:netlink_rcv_skb