======================================
| [ 1730.433232][T17286] ==================================================================
| [ 1730.433607][T17286] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [ 1730.433886][T17286] Read of size 1 at addr ffff888007f246ac by task ip/17286
| [ 1730.434146][T17286]
[ 1730.434246][T17286] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1730.434248][T17286] Call Trace:
[ 1730.434254][T17286]  <TASK>
[ 1730.434256][T17286]  dump_stack_lvl (lib/dump_stack.c:123)
[ 1730.434264][T17286]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 1730.434276][T17286]  ? kobject_put (lib/kobject.c:733)
[ 1730.434280][T17286]  print_report (mm/kasan/report.c:483)
[ 1730.434283][T17286]  ? kobject_put (lib/kobject.c:733)
[ 1730.434286][T17286]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[ 1730.434289][T17286]  ? kobject_put (lib/kobject.c:733)
[ 1730.434292][T17286]  kasan_report (mm/kasan/report.c:597)
[ 1730.434295][T17286]  ? kobject_put (lib/kobject.c:733)
[ 1730.434301][T17286]  kobject_put (lib/kobject.c:733)
[ 1730.434304][T17286]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[ 1730.434309][T17286]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[ 1730.434312][T17286]  ? generic_xdp_install (net/core/dev.c:11630)
[ 1730.434317][T17286]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[ 1730.434329][T17286]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[ 1730.434339][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.434357][T17286]  rtnl_dellink (net/core/rtnetlink.c:3580)
[ 1730.434364][T17286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1730.434383][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.434388][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.434394][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.434397][T17286]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[ 1730.434400][T17286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1730.434405][T17286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1730.434408][T17286]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[ 1730.434412][T17286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1730.434414][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.434421][T17286]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1730.434425][T17286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1730.434429][T17286]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[ 1730.434435][T17286]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[ 1730.434438][T17286]  ? 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)
[ 1730.434442][T17286]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1730.434446][T17286]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[ 1730.434450][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.434455][T17286]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1730.434460][T17286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1730.434463][T17286]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[ 1730.434476][T17286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1730.434479][T17286]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[ 1730.434487][T17286]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[ 1730.434490][T17286]  ? __copy_msghdr (net/socket.c:2556)
[ 1730.434499][T17286]  ___sys_sendmsg (net/socket.c:2686)
[ 1730.434502][T17286]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[ 1730.434505][T17286]  ? __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)
[ 1730.434517][T17286]  ? copy_msghdr_from_user (net/socket.c:2673)
[ 1730.434522][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.434526][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.434532][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.434535][T17286]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[ 1730.434551][T17286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1730.434562][T17286]  __sys_sendmsg (net/socket.c:2716)
[ 1730.434565][T17286]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[ 1730.434569][T17286]  ? __sys_sendmsg_sock (net/socket.c:2701)
[ 1730.434577][T17286]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 1730.434581][T17286]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1730.434586][T17286]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1730.434592][T17286] RIP: 0033:0x7f37e68d31d7
[ 1730.434598][T17286] 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)
[ 1730.434601][T17286] RSP: 002b:00007ffd20f9e068 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1730.434606][T17286] RAX: ffffffffffffffda RBX: 00007ffd20f9e790 RCX: 00007f37e68d31d7
[ 1730.434608][T17286] RDX: 0000000000000000 RSI: 00007ffd20f9e0d0 RDI: 0000000000000005
[ 1730.434610][T17286] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1730.434612][T17286] R10: 00007f37e67cff60 R11: 0000000000000246 R12: 0000000000000002
[ 1730.434614][T17286] R13: 00000000690dfa98 R14: 0000000000499600 R15: 0000000000000000
| [ 1730.463416][T17286] refcount_t: underflow; use-after-free.
| [ 1730.463801][T17286] WARNING: CPU: 2 PID: 17286 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [ 1730.464360][T17286] Modules linked in: act_gact cls_flower sch_ingress 8021q ip6_gre ip6_tunnel tunnel6 gre vrf veth
| [ 1730.465643][T17286] Tainted: [B]=BAD_PAGE
[ 1730.465895][T17286] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1730.466296][T17286] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[ 1730.466702][T17286] 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 e5 b5 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 e5 b5 	mov    $0xffffffffb5e58d60,%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
[ 1730.468005][T17286] RSP: 0018:ffffc9000ce2f1f0 EFLAGS: 00010286
[ 1730.468420][T17286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 1730.468879][T17286] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 1730.469358][T17286] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6cfe134
[ 1730.469815][T17286] R10: 0000000000000003 R11: ffffc9000ce2ed80 R12: 0000000000000001
[ 1730.470290][T17286] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 1730.470764][T17286] FS:  00007f37e6705800(0000) GS:ffff88807e6f2000(0000) knlGS:0000000000000000
[ 1730.471526][T17286] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1730.471926][T17286] CR2: 000055f359367dec CR3: 000000000dfa1002 CR4: 0000000000772ef0
[ 1730.472601][T17286] PKRU: 55555554
[ 1730.472857][T17286] Call Trace:
[ 1730.473109][T17286]  <TASK>
[ 1730.473305][T17286]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[ 1730.473633][T17286]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[ 1730.473967][T17286]  ? generic_xdp_install (net/core/dev.c:11630)
[ 1730.474481][T17286]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[ 1730.474817][T17286]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[ 1730.475218][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.475745][T17286]  rtnl_dellink (net/core/rtnetlink.c:3580)
[ 1730.476076][T17286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1730.476681][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.477016][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.477357][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.477672][T17286]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[ 1730.477992][T17286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1730.478331][T17286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1730.478902][T17286]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[ 1730.479235][T17286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1730.479564][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.479890][T17286]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1730.480407][T17286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1730.480725][T17286]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[ 1730.481050][T17286]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[ 1730.481381][T17286]  ? 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)
[ 1730.481888][T17286]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1730.482219][T17286]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[ 1730.482549][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.482867][T17286]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1730.483195][T17286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1730.483510][T17286]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[ 1730.483827][T17286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1730.484139][T17286]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[ 1730.484472][T17286]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[ 1730.484884][T17286]  ? __copy_msghdr (net/socket.c:2556)
[ 1730.485220][T17286]  ___sys_sendmsg (net/socket.c:2686)
[ 1730.485534][T17286]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[ 1730.485855][T17286]  ? __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)
[ 1730.486247][T17286]  ? copy_msghdr_from_user (net/socket.c:2673)
[ 1730.486562][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.487062][T17286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1730.487393][T17286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1730.487715][T17286]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[ 1730.488020][T17286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1730.488530][T17286]  __sys_sendmsg (net/socket.c:2716)
[ 1730.488840][T17286]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[ 1730.489240][T17286]  ? __sys_sendmsg_sock (net/socket.c:2701)
[ 1730.489555][T17286]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 1730.490058][T17286]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1730.490394][T17286]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1730.490768][T17286] RIP: 0033:0x7f37e68d31d7
[ 1730.491102][T17286] 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)
[ 1730.492162][T17286] RSP: 002b:00007ffd20f9e068 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1730.492837][T17286] RAX: ffffffffffffffda RBX: 00007ffd20f9e790 RCX: 00007f37e68d31d7
[ 1730.493303][T17286] RDX: 0000000000000000 RSI: 00007ffd20f9e0d0 RDI: 0000000000000005
[ 1730.493750][T17286] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1730.494402][T17286] R10: 00007f37e67cff60 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