======================================
| xx__-> [   89.266877][  T627] ==================================================================
| [   89.267252][  T627] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   89.267584][  T627] Read of size 1 at addr ffff88800a5ac6ac by task ip/627
| [   89.267851][  T627]
[   89.267969][  T627] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   89.267972][  T627] Call Trace:
[   89.267974][  T627]  <TASK>
[   89.267976][  T627]  dump_stack_lvl (lib/dump_stack.c:123)
[   89.267985][  T627]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   89.267993][  T627]  ? kobject_put (lib/kobject.c:733)
[   89.267997][  T627]  print_report (mm/kasan/report.c:483)
[   89.268000][  T627]  ? kobject_put (lib/kobject.c:733)
[   89.268003][  T627]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   89.268007][  T627]  ? kobject_put (lib/kobject.c:733)
[   89.268010][  T627]  kasan_report (mm/kasan/report.c:597)
[   89.268014][  T627]  ? kobject_put (lib/kobject.c:733)
[   89.268019][  T627]  kobject_put (lib/kobject.c:733)
[   89.268022][  T627]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   89.268028][  T627]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   89.268031][  T627]  ? generic_xdp_install (net/core/dev.c:11630)
[   89.268036][  T627]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   89.268043][  T627]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   89.268048][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.268058][  T627]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   89.268064][  T627]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   89.268083][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.268088][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.268094][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.268097][  T627]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   89.268100][  T627]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   89.268105][  T627]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   89.268109][  T627]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   89.268113][  T627]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   89.268115][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.268122][  T627]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   89.268127][  T627]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   89.268131][  T627]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   89.268137][  T627]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   89.268140][  T627]  ? 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)
[   89.268144][  T627]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   89.268148][  T627]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   89.268152][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.268157][  T627]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   89.268162][  T627]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   89.268165][  T627]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   89.268173][  T627]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   89.268176][  T627]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   89.268183][  T627]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   89.268186][  T627]  ? __copy_msghdr (net/socket.c:2556)
[   89.268201][  T627]  ___sys_sendmsg (net/socket.c:2686)
[   89.268204][  T627]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   89.268207][  T627]  ? __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)
[   89.268215][  T627]  ? copy_msghdr_from_user (net/socket.c:2673)
[   89.268220][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.268225][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.268230][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.268234][  T627]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   89.268240][  T627]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   89.268246][  T627]  __sys_sendmsg (net/socket.c:2716)
[   89.268249][  T627]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   89.268253][  T627]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   89.268260][  T627]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   89.268264][  T627]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   89.268271][  T627]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   89.268275][  T627] RIP: 0033:0x7f36192651d7
[   89.268280][  T627] 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)
[   89.268284][  T627] RSP: 002b:00007ffd00fa8fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   89.268288][  T627] RAX: ffffffffffffffda RBX: 00007ffd00fa9710 RCX: 00007f36192651d7
[   89.268290][  T627] RDX: 0000000000000000 RSI: 00007ffd00fa9050 RDI: 0000000000000005
[   89.268292][  T627] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   89.268294][  T627] R10: 00007f3619161f60 R11: 0000000000000246 R12: 0000000000000002
[   89.268295][  T627] R13: 00000000690df69f R14: 0000000000499600 R15: 0000000000000000
| [   89.298938][  T627] refcount_t: underflow; use-after-free.
| [   89.299163][  T627] WARNING: CPU: 0 PID: 627 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   89.299656][  T627] Modules linked in: vrf veth
| [   89.300539][  T627] Tainted: [B]=BAD_PAGE
[   89.300738][  T627] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   89.301070][  T627] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   89.301439][  T627] 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 a5 b1 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 a5 b1 	mov    $0xffffffffb1a58d60,%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
[   89.302263][  T627] RSP: 0018:ffffc900010a71f0 EFLAGS: 00010286
[   89.302496][  T627] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   89.302778][  T627] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   89.303157][  T627] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff647e134
[   89.303462][  T627] R10: 0000000000000003 R11: ffffc900010a6d80 R12: 0000000000000001
[   89.303767][  T627] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   89.304228][  T627] FS:  00007f3619097800(0000) GS:ffff8880829f2000(0000) knlGS:0000000000000000
[   89.304537][  T627] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   89.304796][  T627] CR2: 00007f5dffa920f0 CR3: 0000000005422005 CR4: 0000000000772ef0
[   89.305173][  T627] PKRU: 55555554
[   89.305308][  T627] Call Trace:
[   89.305444][  T627]  <TASK>
[   89.305539][  T627]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   89.305750][  T627]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   89.305967][  T627]  ? generic_xdp_install (net/core/dev.c:11630)
[   89.306177][  T627]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   89.306391][  T627]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   89.306787][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.306992][  T627]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   89.307331][  T627]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   89.307573][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.307875][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.308083][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.308270][  T627]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   89.308462][  T627]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   89.308763][  T627]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   89.308987][  T627]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   89.309168][  T627]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   89.309361][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.309656][  T627]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   89.309855][  T627]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   89.310035][  T627]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   89.310226][  T627]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   89.310519][  T627]  ? 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)
[   89.310728][  T627]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   89.310939][  T627]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   89.311125][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.311425][  T627]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   89.311617][  T627]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   89.311815][  T627]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   89.312018][  T627]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   89.312295][  T627]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   89.312493][  T627]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   89.312748][  T627]  ? __copy_msghdr (net/socket.c:2556)
[   89.313048][  T627]  ___sys_sendmsg (net/socket.c:2686)
[   89.313242][  T627]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   89.313446][  T627]  ? __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)
[   89.313684][  T627]  ? copy_msghdr_from_user (net/socket.c:2673)
[   89.313982][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.314167][  T627]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   89.314364][  T627]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   89.314560][  T627]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   89.314769][  T627]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   89.314963][  T627]  __sys_sendmsg (net/socket.c:2716)
[   89.315158][  T627]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   89.315396][  T627]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   89.315585][  T627]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   89.315777][  T627]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   89.315973][  T627]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   89.316215][  T627] RIP: 0033:0x7f36192651d7
[   89.316518][  T627] 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)
[   89.317305][  T627] RSP: 002b:00007ffd00fa8fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   89.317592][  T627] RAX: ffffffffffffffda RBX: 00007ffd00fa9710 RCX: 00007f36192651d7
[   89.317890][  T627] RDX: 0000000000000000 RSI: 00007ffd00fa9050 RDI: 0000000000000005
[   89.318273][  T627] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   89.318550][  T627] R10: 00007f3619161f60 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