======================================
| [   48.536092][  T519] ==================================================================
| [   48.536406][  T519] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   48.536688][  T519] Read of size 1 at addr ffff8880074796ac by task ip/519
| [   48.536930][  T519]
[   48.537066][  T519] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   48.537068][  T519] Call Trace:
[   48.537071][  T519]  <TASK>
[   48.537073][  T519]  dump_stack_lvl (lib/dump_stack.c:123)
[   48.537080][  T519]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   48.537094][  T519]  ? kobject_put (lib/kobject.c:733)
[   48.537098][  T519]  print_report (mm/kasan/report.c:483)
[   48.537101][  T519]  ? kobject_put (lib/kobject.c:733)
[   48.537104][  T519]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   48.537107][  T519]  ? kobject_put (lib/kobject.c:733)
[   48.537111][  T519]  kasan_report (mm/kasan/report.c:597)
[   48.537114][  T519]  ? kobject_put (lib/kobject.c:733)
[   48.537120][  T519]  kobject_put (lib/kobject.c:733)
[   48.537123][  T519]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   48.537132][  T519]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   48.537135][  T519]  ? generic_xdp_install (net/core/dev.c:11630)
[   48.537140][  T519]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   48.537150][  T519]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   48.537156][  T519]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   48.537175][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.537184][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.537191][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.537194][  T519]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   48.537197][  T519]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   48.537202][  T519]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   48.537205][  T519]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   48.537209][  T519]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   48.537211][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.537218][  T519]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   48.537225][  T519]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   48.537228][  T519]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   48.537235][  T519]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   48.537238][  T519]  ? 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)
[   48.537242][  T519]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   48.537246][  T519]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   48.537249][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.537255][  T519]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   48.537259][  T519]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   48.537264][  T519]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   48.537273][  T519]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   48.537277][  T519]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   48.537288][  T519]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   48.537291][  T519]  ? __copy_msghdr (net/socket.c:2556)
[   48.537300][  T519]  ___sys_sendmsg (net/socket.c:2686)
[   48.537303][  T519]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   48.537306][  T519]  ? __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)
[   48.537313][  T519]  ? copy_msghdr_from_user (net/socket.c:2673)
[   48.537318][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.537323][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.537328][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.537332][  T519]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   48.537339][  T519]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   48.537345][  T519]  __sys_sendmsg (net/socket.c:2716)
[   48.537348][  T519]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   48.537352][  T519]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   48.537360][  T519]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   48.537364][  T519]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   48.537370][  T519]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   48.537374][  T519] RIP: 0033:0x7f57bba561d7
[   48.537383][  T519] 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)
[   48.537386][  T519] RSP: 002b:00007ffecc17c5c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   48.537391][  T519] RAX: ffffffffffffffda RBX: 00007ffecc17ccf0 RCX: 00007f57bba561d7
[   48.537393][  T519] RDX: 0000000000000000 RSI: 00007ffecc17c630 RDI: 0000000000000005
[   48.537395][  T519] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   48.537396][  T519] R10: 00007f57bb952f60 R11: 0000000000000246 R12: 0000000000000002
[   48.537398][  T519] R13: 00000000690def03 R14: 0000000000499600 R15: 0000000000000000
| [   48.565096][  T519] refcount_t: underflow; use-after-free.
| [   48.565378][  T519] WARNING: CPU: 1 PID: 519 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   48.565819][  T519] Modules linked in: 8021q vrf veth
| [   48.566570][  T519] Tainted: [B]=BAD_PAGE
[   48.566750][  T519] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   48.567054][  T519] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   48.567365][  T519] 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 b0 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 b0 	mov    $0xffffffffb0658d60,%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
[   48.568209][  T519] RSP: 0000:ffffc90000d571f0 EFLAGS: 00010286
[   48.568534][  T519] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   48.568901][  T519] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   48.569259][  T519] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff61fe134
[   48.569820][  T519] R10: 0000000000000003 R11: ffffc90000d56d80 R12: 0000000000000001
[   48.570198][  T519] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   48.570591][  T519] FS:  00007f57bb888800(0000) GS:ffff888083e72000(0000) knlGS:0000000000000000
[   48.571174][  T519] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   48.571511][  T519] CR2: 00000000004061e9 CR3: 0000000005320003 CR4: 0000000000772ef0
[   48.571871][  T519] PKRU: 55555554
[   48.572219][  T519] Call Trace:
[   48.572405][  T519]  <TASK>
[   48.572529][  T519]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   48.572766][  T519]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   48.573003][  T519]  ? generic_xdp_install (net/core/dev.c:11630)
[   48.573420][  T519]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   48.573718][  T519]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   48.573963][  T519]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   48.574285][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.574692][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.574931][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.575162][  T519]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   48.575506][  T519]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   48.575762][  T519]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   48.576057][  T519]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   48.576403][  T519]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   48.576634][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.576868][  T519]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   48.577107][  T519]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   48.577439][  T519]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   48.577676][  T519]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   48.577905][  T519]  ? 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)
[   48.578141][  T519]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   48.578395][  T519]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   48.578627][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.578866][  T519]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   48.579104][  T519]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   48.579340][  T519]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   48.579584][  T519]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   48.579825][  T519]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   48.580070][  T519]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   48.580370][  T519]  ? __copy_msghdr (net/socket.c:2556)
[   48.580624][  T519]  ___sys_sendmsg (net/socket.c:2686)
[   48.580851][  T519]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   48.581113][  T519]  ? __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)
[   48.581423][  T519]  ? copy_msghdr_from_user (net/socket.c:2673)
[   48.581677][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.581925][  T519]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   48.582162][  T519]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   48.582398][  T519]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   48.582625][  T519]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   48.582862][  T519]  __sys_sendmsg (net/socket.c:2716)
[   48.583093][  T519]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   48.583385][  T519]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   48.583620][  T519]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   48.583858][  T519]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   48.584090][  T519]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   48.584379][  T519] RIP: 0033:0x7f57bba561d7
[   48.584658][  T519] 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)
[   48.585515][  T519] RSP: 002b:00007ffecc17c5c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   48.585875][  T519] RAX: ffffffffffffffda RBX: 00007ffecc17ccf0 RCX: 00007f57bba561d7
[   48.586230][  T519] RDX: 0000000000000000 RSI: 00007ffecc17c630 RDI: 0000000000000005
[   48.586582][  T519] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   48.586933][  T519] R10: 00007f57bb952f60 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