======================================
| [   52.064875][  T464] ==================================================================
| [   52.065251][  T464] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   52.065585][  T464] Read of size 1 at addr ffff88800230a6ac by task ip/464
| [   52.065821][  T464]
[   52.065948][  T464] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   52.065951][  T464] Call Trace:
[   52.065956][  T464]  <TASK>
[   52.065958][  T464]  dump_stack_lvl (lib/dump_stack.c:123)
[   52.065968][  T464]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   52.065978][  T464]  ? kobject_put (lib/kobject.c:733)
[   52.065982][  T464]  print_report (mm/kasan/report.c:483)
[   52.065985][  T464]  ? kobject_put (lib/kobject.c:733)
[   52.065989][  T464]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   52.065992][  T464]  ? kobject_put (lib/kobject.c:733)
[   52.065995][  T464]  kasan_report (mm/kasan/report.c:597)
[   52.065999][  T464]  ? kobject_put (lib/kobject.c:733)
[   52.066004][  T464]  kobject_put (lib/kobject.c:733)
[   52.066008][  T464]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   52.066016][  T464]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   52.066019][  T464]  ? generic_xdp_install (net/core/dev.c:11630)
[   52.066021][  T464]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   52.066030][  T464]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   52.066036][  T464]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   52.066077][  T464]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   52.066082][  T464]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   52.066100][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.066109][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.066115][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.066118][  T464]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   52.066121][  T464]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   52.066126][  T464]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   52.066129][  T464]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   52.066132][  T464]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   52.066135][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.066142][  T464]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   52.066148][  T464]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   52.066151][  T464]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   52.066157][  T464]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   52.066160][  T464]  ? 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)
[   52.066164][  T464]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   52.066168][  T464]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   52.066172][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.066177][  T464]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   52.066182][  T464]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   52.066185][  T464]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   52.066194][  T464]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   52.066197][  T464]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   52.066204][  T464]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   52.066207][  T464]  ? __copy_msghdr (net/socket.c:2556)
[   52.066215][  T464]  ___sys_sendmsg (net/socket.c:2686)
[   52.066219][  T464]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   52.066222][  T464]  ? __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)
[   52.066229][  T464]  ? copy_msghdr_from_user (net/socket.c:2673)
[   52.066234][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.066238][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.066244][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.066247][  T464]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   52.066255][  T464]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   52.066261][  T464]  __sys_sendmsg (net/socket.c:2716)
[   52.066265][  T464]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   52.066268][  T464]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   52.066276][  T464]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   52.066280][  T464]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   52.066286][  T464]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   52.066291][  T464] RIP: 0033:0x7fc7ec9971d7
[   52.066297][  T464] 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)
[   52.066300][  T464] RSP: 002b:00007ffe53660598 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   52.066309][  T464] RAX: ffffffffffffffda RBX: 00007ffe53660cc0 RCX: 00007fc7ec9971d7
[   52.066312][  T464] RDX: 0000000000000000 RSI: 00007ffe53660600 RDI: 0000000000000005
[   52.066315][  T464] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   52.066317][  T464] R10: 00007fc7ec893f60 R11: 0000000000000246 R12: 0000000000000002
[   52.066319][  T464] R13: 00000000690dee48 R14: 0000000000499600 R15: 0000000000000000
| [   52.109451][  T464] refcount_t: underflow; use-after-free.
| [   52.109719][  T464] WARNING: CPU: 2 PID: 464 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   52.110100][  T464] Modules linked in: bridge stp llc 8021q vrf veth
| [   52.110806][  T464] Tainted: [B]=BAD_PAGE
[   52.110979][  T464] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   52.111397][  T464] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   52.111798][  T464] 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 05 aa 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 05 aa 	mov    $0xffffffffaa058d60,%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
[   52.112638][  T464] RSP: 0018:ffffc90000cc71f0 EFLAGS: 00010286
[   52.112913][  T464] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   52.113207][  T464] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   52.113645][  T464] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff553e134
[   52.113971][  T464] R10: 0000000000000003 R11: ffffc90000cc6d80 R12: 0000000000000001
[   52.114267][  T464] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   52.114711][  T464] FS:  00007fc7ec7c9800(0000) GS:ffff8880848f2000(0000) knlGS:0000000000000000
[   52.115056][  T464] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   52.115315][  T464] CR2: 00007fa55badbf50 CR3: 000000000a279005 CR4: 0000000000772ef0
[   52.115767][  T464] PKRU: 55555554
[   52.115945][  T464] Call Trace:
[   52.116110][  T464]  <TASK>
[   52.116229][  T464]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   52.116469][  T464]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   52.116713][  T464]  ? generic_xdp_install (net/core/dev.c:11630)
[   52.116918][  T464]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   52.117135][  T464]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   52.117469][  T464]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   52.117723][  T464]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   52.117934][  T464]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   52.118200][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.118429][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.118699][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.118898][  T464]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   52.119088][  T464]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   52.119316][  T464]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   52.119602][  T464]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   52.119824][  T464]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   52.120132][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.120347][  T464]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   52.120584][  T464]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   52.120800][  T464]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   52.121005][  T464]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   52.121304][  T464]  ? 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)
[   52.121532][  T464]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   52.121778][  T464]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   52.121987][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.122291][  T464]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   52.122534][  T464]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   52.122754][  T464]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   52.122958][  T464]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   52.123254][  T464]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   52.123485][  T464]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   52.123755][  T464]  ? __copy_msghdr (net/socket.c:2556)
[   52.123965][  T464]  ___sys_sendmsg (net/socket.c:2686)
[   52.124269][  T464]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   52.124503][  T464]  ? __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)
[   52.124778][  T464]  ? copy_msghdr_from_user (net/socket.c:2673)
[   52.125078][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.125283][  T464]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   52.125515][  T464]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   52.125754][  T464]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   52.126064][  T464]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   52.126281][  T464]  __sys_sendmsg (net/socket.c:2716)
[   52.126520][  T464]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   52.126794][  T464]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   52.127102][  T464]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   52.127310][  T464]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   52.127544][  T464]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   52.127807][  T464] RIP: 0033:0x7fc7ec9971d7
[   52.128024][  T464] 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)
[   52.128716][  T464] RSP: 002b:00007ffe53660598 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   52.129008][  T464] RAX: ffffffffffffffda RBX: 00007ffe53660cc0 RCX: 00007fc7ec9971d7
[   52.129305][  T464] RDX: 0000000000000000 RSI: 00007ffe53660600 RDI: 0000000000000005
[   52.129628][  T464] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   52.129942][  T464] R10: 00007fc7ec893f60 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