======================================
| [  118.307322][  T796] ==================================================================
| [  118.307899][  T796] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  118.308352][  T796] Read of size 1 at addr ffff88800e2946ac by task ip/796
| [  118.308717][  T796]
[  118.308877][  T796] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  118.308882][  T796] Call Trace:
[  118.308887][  T796]  <TASK>
[  118.308890][  T796]  dump_stack_lvl (lib/dump_stack.c:123)
[  118.308902][  T796]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  118.308924][  T796]  ? kobject_put (lib/kobject.c:733)
[  118.308930][  T796]  print_report (mm/kasan/report.c:483)
[  118.308936][  T796]  ? kobject_put (lib/kobject.c:733)
[  118.308940][  T796]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  118.308948][  T796]  ? kobject_put (lib/kobject.c:733)
[  118.308953][  T796]  kasan_report (mm/kasan/report.c:597)
[  118.308960][  T796]  ? kobject_put (lib/kobject.c:733)
[  118.308969][  T796]  kobject_put (lib/kobject.c:733)
[  118.308975][  T796]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  118.308990][  T796]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  118.308995][  T796]  ? generic_xdp_install (net/core/dev.c:11630)
[  118.309000][  T796]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  118.309006][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.309024][  T796]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  118.309034][  T796]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  118.309070][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.309078][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.309089][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.309095][  T796]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  118.309099][  T796]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  118.309106][  T796]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  118.309112][  T796]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  118.309118][  T796]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  118.309123][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.309136][  T796]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  118.309144][  T796]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  118.309150][  T796]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  118.309162][  T796]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  118.309167][  T796]  ? 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)
[  118.309174][  T796]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  118.309182][  T796]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  118.309189][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.309198][  T796]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  118.309207][  T796]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  118.309212][  T796]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  118.309235][  T796]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  118.309240][  T796]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  118.309256][  T796]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  118.309261][  T796]  ? __copy_msghdr (net/socket.c:2556)
[  118.309278][  T796]  ___sys_sendmsg (net/socket.c:2686)
[  118.309283][  T796]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  118.309288][  T796]  ? __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)
[  118.309305][  T796]  ? copy_msghdr_from_user (net/socket.c:2673)
[  118.309313][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.309320][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.309330][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.309337][  T796]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  118.309356][  T796]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  118.309368][  T796]  __sys_sendmsg (net/socket.c:2716)
[  118.309373][  T796]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  118.309381][  T796]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  118.309396][  T796]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  118.309402][  T796]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  118.309414][  T796]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  118.309427][  T796] RIP: 0033:0x7ffbb279f1d7
[  118.309437][  T796] 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)
[  118.309444][  T796] RSP: 002b:00007ffef9812888 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  118.309451][  T796] RAX: ffffffffffffffda RBX: 00007ffef9812fb0 RCX: 00007ffbb279f1d7
[  118.309454][  T796] RDX: 0000000000000000 RSI: 00007ffef98128f0 RDI: 0000000000000005
[  118.309459][  T796] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  118.309462][  T796] R10: 00007ffbb269bf60 R11: 0000000000000246 R12: 0000000000000002
[  118.309465][  T796] R13: 00000000690df580 R14: 0000000000499600 R15: 0000000000000000
| [  118.358433][  T796] refcount_t: underflow; use-after-free.
| [  118.358842][  T796] WARNING: CPU: 3 PID: 796 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  118.359551][  T796] Modules linked in: cls_flower act_mirred bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth
| [  118.360561][  T796] Tainted: [B]=BAD_PAGE
[  118.360718][  T796] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  118.360936][  T796] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  118.361272][  T796] 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 65 92 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 65 92 	mov    $0xffffffff92658d60,%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
[  118.362311][  T796] RSP: 0018:ffffc9000155f1f0 EFLAGS: 00010286
[  118.362688][  T796] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  118.363122][  T796] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  118.363644][  T796] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff25fe134
[  118.363997][  T796] R10: 0000000000000003 R11: ffffc9000155ed80 R12: 0000000000000001
[  118.364258][  T796] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  118.364513][  T796] FS:  00007ffbb25d1800(0000) GS:ffff8880a1f72000(0000) knlGS:0000000000000000
[  118.364859][  T796] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  118.365091][  T796] CR2: 00000000004e5530 CR3: 000000000bfc1002 CR4: 0000000000772ef0
[  118.365471][  T796] PKRU: 55555554
[  118.365613][  T796] Call Trace:
[  118.365749][  T796]  <TASK>
[  118.365841][  T796]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  118.366104][  T796]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  118.366281][  T796]  ? generic_xdp_install (net/core/dev.c:11630)
[  118.366461][  T796]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  118.366639][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.366939][  T796]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  118.367119][  T796]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  118.367343][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.367517][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.367782][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.368065][  T796]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  118.368351][  T796]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  118.368671][  T796]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  118.369068][  T796]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  118.369357][  T796]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  118.369642][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.369933][  T796]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  118.370411][  T796]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  118.370686][  T796]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  118.370965][  T796]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  118.371241][  T796]  ? 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)
[  118.371725][  T796]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  118.371969][  T796]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  118.372131][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.372292][  T796]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  118.372579][  T796]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  118.372764][  T796]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  118.372948][  T796]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  118.373117][  T796]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  118.373388][  T796]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  118.373595][  T796]  ? __copy_msghdr (net/socket.c:2556)
[  118.373881][  T796]  ___sys_sendmsg (net/socket.c:2686)
[  118.374160][  T796]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  118.374632][  T796]  ? __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)
[  118.374943][  T796]  ? copy_msghdr_from_user (net/socket.c:2673)
[  118.375118][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.375371][  T796]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  118.375549][  T796]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  118.375718][  T796]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  118.375878][  T796]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  118.376140][  T796]  __sys_sendmsg (net/socket.c:2716)
[  118.376300][  T796]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  118.376533][  T796]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  118.376710][  T796]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  118.376964][  T796]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  118.377127][  T796]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  118.377323][  T796] RIP: 0033:0x7ffbb279f1d7
[  118.377504][  T796] 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)
[  118.378202][  T796] RSP: 002b:00007ffef9812888 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  118.378552][  T796] RAX: ffffffffffffffda RBX: 00007ffef9812fb0 RCX: 00007ffbb279f1d7
[  118.378879][  T796] RDX: 0000000000000000 RSI: 00007ffef98128f0 RDI: 0000000000000005
[  118.379126][  T796] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  118.379481][  T796] R10: 00007ffbb269bf60 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