======================================
| [   77.061500][  T554] ==================================================================
| [   77.061973][  T554] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   77.062462][  T554] Read of size 1 at addr ffff88800c15c6ac by task ip/554
| [   77.062887][  T554]
[   77.063064][  T554] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   77.063068][  T554] Call Trace:
[   77.063074][  T554]  <TASK>
[   77.063077][  T554]  dump_stack_lvl (lib/dump_stack.c:123)
[   77.063091][  T554]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   77.063109][  T554]  ? kobject_put (lib/kobject.c:733)
[   77.063119][  T554]  print_report (mm/kasan/report.c:483)
[   77.063125][  T554]  ? kobject_put (lib/kobject.c:733)
[   77.063130][  T554]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   77.063136][  T554]  ? kobject_put (lib/kobject.c:733)
[   77.063141][  T554]  kasan_report (mm/kasan/report.c:597)
[   77.063147][  T554]  ? kobject_put (lib/kobject.c:733)
[   77.063157][  T554]  kobject_put (lib/kobject.c:733)
[   77.063164][  T554]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   77.063176][  T554]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   77.063182][  T554]  ? generic_xdp_install (net/core/dev.c:11630)
[   77.063189][  T554]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   77.063201][  T554]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   77.063209][  T554]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   77.063249][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.063262][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.063274][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.063281][  T554]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   77.063285][  T554]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   77.063293][  T554]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   77.063300][  T554]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   77.063307][  T554]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   77.063312][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.063326][  T554]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   77.063336][  T554]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   77.063343][  T554]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   77.063356][  T554]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   77.063361][  T554]  ? 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)
[   77.063368][  T554]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   77.063376][  T554]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   77.063383][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.063393][  T554]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   77.063401][  T554]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   77.063407][  T554]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   77.063427][  T554]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   77.063434][  T554]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   77.063450][  T554]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   77.063455][  T554]  ? __copy_msghdr (net/socket.c:2556)
[   77.063470][  T554]  ___sys_sendmsg (net/socket.c:2686)
[   77.063475][  T554]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   77.063480][  T554]  ? __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)
[   77.063492][  T554]  ? copy_msghdr_from_user (net/socket.c:2673)
[   77.063501][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.063509][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.063519][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.063526][  T554]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   77.063542][  T554]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   77.063554][  T554]  __sys_sendmsg (net/socket.c:2716)
[   77.063559][  T554]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   77.063566][  T554]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   77.063580][  T554]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   77.063588][  T554]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   77.063597][  T554]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   77.063604][  T554] RIP: 0033:0x7f820cf161d7
[   77.063612][  T554] 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)
[   77.063617][  T554] RSP: 002b:00007ffc7979d988 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   77.063624][  T554] RAX: ffffffffffffffda RBX: 00007ffc7979e0b0 RCX: 00007f820cf161d7
[   77.063628][  T554] RDX: 0000000000000000 RSI: 00007ffc7979d9f0 RDI: 0000000000000005
[   77.063631][  T554] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   77.063634][  T554] R10: 00007f820ce12f60 R11: 0000000000000246 R12: 0000000000000002
[   77.063637][  T554] R13: 00000000690dec22 R14: 0000000000499600 R15: 0000000000000000
| [   77.114985][  T554] refcount_t: underflow; use-after-free.
| [   77.115382][  T554] WARNING: CPU: 2 PID: 554 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   77.115937][  T554] Modules linked in: act_mirred cls_flower act_gact cls_matchall 8021q bridge stp llc sch_ingress vrf veth
| [   77.117335][  T554] Tainted: [B]=BAD_PAGE
[   77.117604][  T554] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   77.117987][  T554] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   77.118424][  T554] 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 25 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 25 93 	mov    $0xffffffff93258d60,%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
[   77.119448][  T554] RSP: 0018:ffffc90000e5f1f0 EFLAGS: 00010286
[   77.119847][  T554] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   77.120318][  T554] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   77.120787][  T554] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff277e134
[   77.121241][  T554] R10: 0000000000000003 R11: ffffc90000e5ed80 R12: 0000000000000001
[   77.121723][  T554] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   77.122202][  T554] FS:  00007f820cd48800(0000) GS:ffff88809b6f2000(0000) knlGS:0000000000000000
[   77.122784][  T554] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   77.123170][  T554] CR2: 00007f47d5b83050 CR3: 000000000c985005 CR4: 0000000000772ef0
[   77.123621][  T554] PKRU: 55555554
[   77.123875][  T554] Call Trace:
[   77.124132][  T554]  <TASK>
[   77.124305][  T554]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   77.124711][  T554]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   77.125032][  T554]  ? generic_xdp_install (net/core/dev.c:11630)
[   77.125345][  T554]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   77.125659][  T554]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   77.125978][  T554]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   77.126388][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.126717][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.127048][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.127372][  T554]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   77.127673][  T554]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   77.127983][  T554]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   77.128356][  T554]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   77.128703][  T554]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   77.129017][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.129340][  T554]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   77.129678][  T554]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   77.130007][  T554]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   77.130365][  T554]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   77.130686][  T554]  ? 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)
[   77.131007][  T554]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   77.131349][  T554]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   77.131665][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.131987][  T554]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   77.132319][  T554]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   77.132674][  T554]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   77.133005][  T554]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   77.133344][  T554]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   77.133677][  T554]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   77.134071][  T554]  ? __copy_msghdr (net/socket.c:2556)
[   77.134420][  T554]  ___sys_sendmsg (net/socket.c:2686)
[   77.134735][  T554]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   77.135047][  T554]  ? __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)
[   77.135461][  T554]  ? copy_msghdr_from_user (net/socket.c:2673)
[   77.135781][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.136092][  T554]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   77.136431][  T554]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   77.136759][  T554]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   77.137082][  T554]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   77.137426][  T554]  __sys_sendmsg (net/socket.c:2716)
[   77.137767][  T554]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   77.138175][  T554]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   77.138499][  T554]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   77.138802][  T554]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   77.139102][  T554]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   77.139490][  T554] RIP: 0033:0x7f820cf161d7
[   77.139848][  T554] 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)
[   77.140976][  T554] RSP: 002b:00007ffc7979d988 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   77.141489][  T554] RAX: ffffffffffffffda RBX: 00007ffc7979e0b0 RCX: 00007f820cf161d7
[   77.141975][  T554] RDX: 0000000000000000 RSI: 00007ffc7979d9f0 RDI: 0000000000000005
[   77.142483][  T554] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   77.142978][  T554] R10: 00007f820ce12f60 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