======================================
| [ 1621.036225][T17219] ==================================================================
| [ 1621.036557][T17219] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [ 1621.036863][T17219] Read of size 1 at addr ffff8880076996ac by task ip/17219
| [ 1621.037109][T17219]
[ 1621.037217][T17219] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1621.037222][T17219] Call Trace:
[ 1621.037227][T17219]  <TASK>
[ 1621.037229][T17219]  dump_stack_lvl (lib/dump_stack.c:123)
[ 1621.037240][T17219]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 1621.037260][T17219]  ? kobject_put (lib/kobject.c:733)
[ 1621.037264][T17219]  print_report (mm/kasan/report.c:483)
[ 1621.037267][T17219]  ? kobject_put (lib/kobject.c:733)
[ 1621.037271][T17219]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[ 1621.037274][T17219]  ? kobject_put (lib/kobject.c:733)
[ 1621.037277][T17219]  kasan_report (mm/kasan/report.c:597)
[ 1621.037281][T17219]  ? kobject_put (lib/kobject.c:733)
[ 1621.037286][T17219]  kobject_put (lib/kobject.c:733)
[ 1621.037290][T17219]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[ 1621.037301][T17219]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[ 1621.037304][T17219]  ? generic_xdp_install (net/core/dev.c:11630)
[ 1621.037308][T17219]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[ 1621.037315][T17219]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[ 1621.037320][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.037338][T17219]  rtnl_dellink (net/core/rtnetlink.c:3580)
[ 1621.037345][T17219]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1621.037364][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.037368][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.037374][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.037378][T17219]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[ 1621.037381][T17219]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1621.037386][T17219]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1621.037390][T17219]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[ 1621.037393][T17219]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1621.037396][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.037403][T17219]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1621.037412][T17219]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1621.037416][T17219]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[ 1621.037422][T17219]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[ 1621.037425][T17219]  ? 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)
[ 1621.037429][T17219]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1621.037433][T17219]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[ 1621.037437][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.037442][T17219]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1621.037447][T17219]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1621.037450][T17219]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[ 1621.037466][T17219]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1621.037469][T17219]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[ 1621.037481][T17219]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[ 1621.037484][T17219]  ? __copy_msghdr (net/socket.c:2556)
[ 1621.037493][T17219]  ___sys_sendmsg (net/socket.c:2686)
[ 1621.037496][T17219]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[ 1621.037499][T17219]  ? __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)
[ 1621.037514][T17219]  ? copy_msghdr_from_user (net/socket.c:2673)
[ 1621.037519][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.037523][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.037529][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.037532][T17219]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[ 1621.037550][T17219]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1621.037557][T17219]  __sys_sendmsg (net/socket.c:2716)
[ 1621.037560][T17219]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[ 1621.037564][T17219]  ? __sys_sendmsg_sock (net/socket.c:2701)
[ 1621.037571][T17219]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 1621.037576][T17219]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1621.037585][T17219]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1621.037594][T17219] RIP: 0033:0x7fc98b5471d7
[ 1621.037600][T17219] 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)
[ 1621.037603][T17219] RSP: 002b:00007ffd0c5b6328 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1621.037612][T17219] RAX: ffffffffffffffda RBX: 00007ffd0c5b6a50 RCX: 00007fc98b5471d7
[ 1621.037615][T17219] RDX: 0000000000000000 RSI: 00007ffd0c5b6390 RDI: 0000000000000005
[ 1621.037617][T17219] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1621.037618][T17219] R10: 00007fc98b443f60 R11: 0000000000000246 R12: 0000000000000002
[ 1621.037620][T17219] R13: 00000000690dfa41 R14: 0000000000499600 R15: 0000000000000000
| [ 1621.064637][T17219] refcount_t: underflow; use-after-free.
| [ 1621.064872][T17219] WARNING: CPU: 2 PID: 17219 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [ 1621.065214][T17219] Modules linked in: vrf veth
| [ 1621.065863][T17219] Tainted: [B]=BAD_PAGE
[ 1621.066033][T17219] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1621.066293][T17219] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[ 1621.066576][T17219] 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 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 65 a3 	mov    $0xffffffffa3658d60,%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
[ 1621.067263][T17219] RSP: 0018:ffffc900088571f0 EFLAGS: 00010286
[ 1621.067531][T17219] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 1621.067842][T17219] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 1621.068143][T17219] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff47fe134
[ 1621.068455][T17219] R10: 0000000000000003 R11: ffffc90008856d80 R12: 0000000000000001
[ 1621.068767][T17219] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 1621.069068][T17219] FS:  00007fc98b379800(0000) GS:ffff888090ef2000(0000) knlGS:0000000000000000
[ 1621.069416][T17219] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1621.069685][T17219] CR2: 000055b76b181e58 CR3: 0000000008bc4004 CR4: 0000000000772ef0
[ 1621.070010][T17219] PKRU: 55555554
[ 1621.070188][T17219] Call Trace:
[ 1621.070372][T17219]  <TASK>
[ 1621.070503][T17219]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[ 1621.070730][T17219]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[ 1621.070939][T17219]  ? generic_xdp_install (net/core/dev.c:11630)
[ 1621.071161][T17219]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[ 1621.071389][T17219]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[ 1621.071758][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.071974][T17219]  rtnl_dellink (net/core/rtnetlink.c:3580)
[ 1621.072185][T17219]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1621.072558][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.072770][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.072989][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.073202][T17219]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[ 1621.073534][T17219]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1621.073754][T17219]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1621.074014][T17219]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[ 1621.074238][T17219]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1621.074571][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.074823][T17219]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1621.075036][T17219]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1621.075250][T17219]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[ 1621.075573][T17219]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[ 1621.075783][T17219]  ? 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)
[ 1621.075994][T17219]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1621.076195][T17219]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[ 1621.076507][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.076719][T17219]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1621.076940][T17219]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1621.077146][T17219]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[ 1621.077452][T17219]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1621.077664][T17219]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[ 1621.077884][T17219]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[ 1621.078145][T17219]  ? __copy_msghdr (net/socket.c:2556)
[ 1621.078472][T17219]  ___sys_sendmsg (net/socket.c:2686)
[ 1621.078697][T17219]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[ 1621.078933][T17219]  ? __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)
[ 1621.079206][T17219]  ? copy_msghdr_from_user (net/socket.c:2673)
[ 1621.079434][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.079661][T17219]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1621.079889][T17219]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1621.080201][T17219]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[ 1621.080446][T17219]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1621.080686][T17219]  __sys_sendmsg (net/socket.c:2716)
[ 1621.080915][T17219]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[ 1621.081269][T17219]  ? __sys_sendmsg_sock (net/socket.c:2701)
[ 1621.081488][T17219]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 1621.081696][T17219]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1621.081906][T17219]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1621.082241][T17219] RIP: 0033:0x7fc98b5471d7
[ 1621.082452][T17219] 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)
[ 1621.083252][T17219] RSP: 002b:00007ffd0c5b6328 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1621.083563][T17219] RAX: ffffffffffffffda RBX: 00007ffd0c5b6a50 RCX: 00007fc98b5471d7
[ 1621.083962][T17219] RDX: 0000000000000000 RSI: 00007ffd0c5b6390 RDI: 0000000000000005
[ 1621.084289][T17219] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1621.084608][T17219] R10: 00007fc98b443f60 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