======================================
| [   74.284129][  T576] ==================================================================
| [   74.284463][  T576] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   74.284734][  T576] Read of size 1 at addr ffff8880087616ac by task ip/576
| [   74.284947][  T576]
[   74.285044][  T576] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   74.285047][  T576] Call Trace:
[   74.285050][  T576]  <TASK>
[   74.285051][  T576]  dump_stack_lvl (lib/dump_stack.c:123)
[   74.285058][  T576]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   74.285065][  T576]  ? kobject_put (lib/kobject.c:733)
[   74.285069][  T576]  print_report (mm/kasan/report.c:483)
[   74.285073][  T576]  ? kobject_put (lib/kobject.c:733)
[   74.285076][  T576]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   74.285079][  T576]  ? kobject_put (lib/kobject.c:733)
[   74.285082][  T576]  kasan_report (mm/kasan/report.c:597)
[   74.285086][  T576]  ? kobject_put (lib/kobject.c:733)
[   74.285092][  T576]  kobject_put (lib/kobject.c:733)
[   74.285095][  T576]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   74.285101][  T576]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   74.285104][  T576]  ? generic_xdp_install (net/core/dev.c:11630)
[   74.285107][  T576]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   74.285111][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.285120][  T576]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   74.285125][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.285143][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.285148][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.285154][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.285157][  T576]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   74.285160][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.285165][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.285168][  T576]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   74.285171][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.285174][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.285181][  T576]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   74.285186][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.285190][  T576]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   74.285196][  T576]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   74.285199][  T576]  ? 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)
[   74.285203][  T576]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   74.285207][  T576]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   74.285211][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.285216][  T576]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   74.285221][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.285224][  T576]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   74.285231][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.285235][  T576]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   74.285240][  T576]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   74.285243][  T576]  ? __copy_msghdr (net/socket.c:2556)
[   74.285251][  T576]  ___sys_sendmsg (net/socket.c:2686)
[   74.285254][  T576]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   74.285257][  T576]  ? __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)
[   74.285263][  T576]  ? copy_msghdr_from_user (net/socket.c:2673)
[   74.285267][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.285272][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.285277][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.285281][  T576]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   74.285285][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.285292][  T576]  __sys_sendmsg (net/socket.c:2716)
[   74.285295][  T576]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   74.285298][  T576]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   74.285306][  T576]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   74.285310][  T576]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   74.285315][  T576]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   74.285319][  T576] RIP: 0033:0x7f55be3321d7
[   74.285324][  T576] 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)
[   74.285327][  T576] RSP: 002b:00007ffd92e700f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   74.285332][  T576] RAX: ffffffffffffffda RBX: 00007ffd92e70820 RCX: 00007f55be3321d7
[   74.285334][  T576] RDX: 0000000000000000 RSI: 00007ffd92e70160 RDI: 0000000000000005
[   74.285336][  T576] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   74.285337][  T576] R10: 00007f55be22ef60 R11: 0000000000000246 R12: 0000000000000002
[   74.285339][  T576] R13: 00000000690df75b R14: 0000000000499600 R15: 0000000000000000
| [   74.311567][  T576] refcount_t: underflow; use-after-free.
| [   74.311766][  T576] WARNING: CPU: 0 PID: 576 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   74.312055][  T576] 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
| [   74.313529][  T576] Tainted: [B]=BAD_PAGE
[   74.313654][  T576] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   74.313858][  T576] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   74.314176][  T576] 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 c5 a3 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 c5 a3 	mov    $0xffffffffa3c58d60,%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
[   74.314786][  T576] RSP: 0018:ffffc90000fff1f0 EFLAGS: 00010286
[   74.315094][  T576] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   74.315451][  T576] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   74.315796][  T576] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff48be134
[   74.316041][  T576] R10: 0000000000000003 R11: ffffc90000ffed80 R12: 0000000000000001
[   74.316306][  T576] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   74.316553][  T576] FS:  00007f55be164800(0000) GS:ffff8880907f2000(0000) knlGS:0000000000000000
[   74.316835][  T576] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   74.317041][  T576] CR2: 00000000004e5530 CR3: 000000000c5b8006 CR4: 0000000000772ef0
[   74.317308][  T576] PKRU: 55555554
[   74.317436][  T576] Call Trace:
[   74.317559][  T576]  <TASK>
[   74.317645][  T576]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   74.317812][  T576]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   74.317987][  T576]  ? generic_xdp_install (net/core/dev.c:11630)
[   74.318162][  T576]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   74.318436][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.318604][  T576]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   74.318767][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.318984][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.319252][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.319424][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.319585][  T576]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   74.319757][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.320018][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.320232][  T576]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   74.320399][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.320651][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.320816][  T576]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   74.320989][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.321164][  T576]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   74.321437][  T576]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   74.321601][  T576]  ? 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)
[   74.321763][  T576]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   74.321932][  T576]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   74.322200][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.322377][  T576]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   74.322542][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.322713][  T576]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   74.322972][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.323136][  T576]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   74.323314][  T576]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   74.323514][  T576]  ? __copy_msghdr (net/socket.c:2556)
[   74.323768][  T576]  ___sys_sendmsg (net/socket.c:2686)
[   74.323929][  T576]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   74.324094][  T576]  ? __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)
[   74.324316][  T576]  ? copy_msghdr_from_user (net/socket.c:2673)
[   74.324477][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.324647][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.324809][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.324978][  T576]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   74.325246][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.325416][  T576]  __sys_sendmsg (net/socket.c:2716)
[   74.325604][  T576]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   74.325807][  T576]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   74.326069][  T576]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   74.326246][  T576]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   74.326449][  T576]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   74.326744][  T576] RIP: 0033:0x7f55be3321d7
[   74.326918][  T576] 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)
[   74.327612][  T576] RSP: 002b:00007ffd92e700f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   74.327859][  T576] RAX: ffffffffffffffda RBX: 00007ffd92e70820 RCX: 00007f55be3321d7
[   74.328118][  T576] RDX: 0000000000000000 RSI: 00007ffd92e70160 RDI: 0000000000000005
[   74.328380][  T576] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   74.328623][  T576] R10: 00007f55be22ef60 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