======================================
| [   72.863513][  T396] ==================================================================
| [   72.863872][  T396] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   72.864159][  T396] Read of size 1 at addr ffff8880119c96ac by task ip/396
| [   72.864385][  T396]
[   72.864490][  T396] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   72.864492][  T396] Call Trace:
[   72.864495][  T396]  <TASK>
[   72.864496][  T396]  dump_stack_lvl (lib/dump_stack.c:123)
[   72.864503][  T396]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   72.864515][  T396]  ? kobject_put (lib/kobject.c:733)
[   72.864519][  T396]  print_report (mm/kasan/report.c:483)
[   72.864522][  T396]  ? kobject_put (lib/kobject.c:733)
[   72.864525][  T396]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   72.864528][  T396]  ? kobject_put (lib/kobject.c:733)
[   72.864532][  T396]  kasan_report (mm/kasan/report.c:597)
[   72.864535][  T396]  ? kobject_put (lib/kobject.c:733)
[   72.864540][  T396]  kobject_put (lib/kobject.c:733)
[   72.864544][  T396]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   72.864550][  T396]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   72.864554][  T396]  ? generic_xdp_install (net/core/dev.c:11630)
[   72.864558][  T396]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   72.864564][  T396]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   72.864569][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.864581][  T396]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   72.864587][  T396]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   72.864606][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.864610][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.864616][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.864620][  T396]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   72.864623][  T396]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   72.864628][  T396]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   72.864631][  T396]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   72.864635][  T396]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   72.864638][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.864645][  T396]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   72.864650][  T396]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   72.864654][  T396]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   72.864664][  T396]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   72.864668][  T396]  ? 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)
[   72.864675][  T396]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   72.864682][  T396]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   72.864688][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.864693][  T396]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   72.864698][  T396]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   72.864701][  T396]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   72.864709][  T396]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   72.864712][  T396]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   72.864719][  T396]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   72.864723][  T396]  ? __copy_msghdr (net/socket.c:2556)
[   72.864731][  T396]  ___sys_sendmsg (net/socket.c:2686)
[   72.864734][  T396]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   72.864738][  T396]  ? __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)
[   72.864746][  T396]  ? copy_msghdr_from_user (net/socket.c:2673)
[   72.864751][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.864756][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.864761][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.864765][  T396]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   72.864774][  T396]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   72.864781][  T396]  __sys_sendmsg (net/socket.c:2716)
[   72.864784][  T396]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   72.864788][  T396]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   72.864796][  T396]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   72.864800][  T396]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   72.864807][  T396]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   72.864811][  T396] RIP: 0033:0x7f4a745241d7
[   72.864818][  T396] 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)
[   72.864821][  T396] RSP: 002b:00007ffd09fae9c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   72.864826][  T396] RAX: ffffffffffffffda RBX: 00007ffd09faf0f0 RCX: 00007f4a745241d7
[   72.864828][  T396] RDX: 0000000000000000 RSI: 00007ffd09faea30 RDI: 0000000000000005
[   72.864830][  T396] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   72.864832][  T396] R10: 00007f4a74420f60 R11: 0000000000000246 R12: 0000000000000002
[   72.864834][  T396] R13: 00000000690df04b R14: 0000000000499600 R15: 0000000000000000
| [   72.896831][  T396] refcount_t: underflow; use-after-free.
| [   72.897064][  T396] WARNING: CPU: 2 PID: 396 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   72.897436][  T396] Modules linked in: 8021q vrf veth
| [   72.898936][  T396] Tainted: [B]=BAD_PAGE
[   72.899108][  T396] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   72.899369][  T396] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   72.899636][  T396] 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 8d 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 8d 	mov    $0xffffffff8d258d60,%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
[   72.900338][  T396] RSP: 0018:ffffc900005e71f0 EFLAGS: 00010286
[   72.900597][  T396] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   72.900913][  T396] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   72.901209][  T396] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1b7e134
[   72.901528][  T396] R10: 0000000000000003 R11: ffffc900005e6d80 R12: 0000000000000001
[   72.901842][  T396] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   72.902142][  T396] FS:  00007f4a74356800(0000) GS:ffff8880a72f2000(0000) knlGS:0000000000000000
[   72.902499][  T396] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   72.902763][  T396] CR2: 00000000004e6680 CR3: 0000000004b64003 CR4: 0000000000772ef0
[   72.903069][  T396] PKRU: 55555554
[   72.903232][  T396] Call Trace:
[   72.903402][  T396]  <TASK>
[   72.903520][  T396]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   72.903765][  T396]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   72.903979][  T396]  ? generic_xdp_install (net/core/dev.c:11630)
[   72.904295][  T396]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   72.904515][  T396]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   72.904805][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.905021][  T396]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   72.905333][  T396]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   72.905594][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.905803][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.906008][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.906229][  T396]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   72.906446][  T396]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   72.906653][  T396]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   72.907033][  T396]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   72.907248][  T396]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   72.907465][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.907683][  T396]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   72.907997][  T396]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   72.908210][  T396]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   72.908429][  T396]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   72.908636][  T396]  ? 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)
[   72.908960][  T396]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   72.909169][  T396]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   72.909384][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.909591][  T396]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   72.909909][  T396]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   72.910117][  T396]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   72.910335][  T396]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   72.910544][  T396]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   72.910857][  T396]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   72.911110][  T396]  ? __copy_msghdr (net/socket.c:2556)
[   72.911326][  T396]  ___sys_sendmsg (net/socket.c:2686)
[   72.911531][  T396]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   72.911847][  T396]  ? __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)
[   72.912102][  T396]  ? copy_msghdr_from_user (net/socket.c:2673)
[   72.912315][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.912518][  T396]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   72.912849][  T396]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   72.913049][  T396]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   72.913253][  T396]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   72.913473][  T396]  __sys_sendmsg (net/socket.c:2716)
[   72.913783][  T396]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   72.914027][  T396]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   72.914229][  T396]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   72.914538][  T396]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   72.914748][  T396]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   72.914987][  T396] RIP: 0033:0x7f4a745241d7
[   72.915201][  T396] 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)
[   72.915881][  T396] RSP: 002b:00007ffd09fae9c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   72.916281][  T396] RAX: ffffffffffffffda RBX: 00007ffd09faf0f0 RCX: 00007f4a745241d7
[   72.916579][  T396] RDX: 0000000000000000 RSI: 00007ffd09faea30 RDI: 0000000000000005
[   72.916908][  T396] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   72.917203][  T396] R10: 00007f4a74420f60 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