======================================
| [   15.114665][  T274] ==================================================================
| [   15.114948][  T274] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   15.115214][  T274] Read of size 1 at addr ffff888008e2a69c by task ip/274
| [   15.115444][  T274]
[   15.115550][  T274] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.115554][  T274] Call Trace:
[   15.115557][  T274]  <TASK>
[   15.115558][  T274]  dump_stack_lvl (lib/dump_stack.c:123)
[   15.115565][  T274]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   15.115581][  T274]  ? kobject_put (lib/kobject.c:733)
[   15.115584][  T274]  print_report (mm/kasan/report.c:483)
[   15.115587][  T274]  ? kobject_put (lib/kobject.c:733)
[   15.115589][  T274]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   15.115592][  T274]  ? kobject_put (lib/kobject.c:733)
[   15.115594][  T274]  kasan_report (mm/kasan/report.c:597)
[   15.115598][  T274]  ? kobject_put (lib/kobject.c:733)
[   15.115604][  T274]  kobject_put (lib/kobject.c:733)
[   15.115608][  T274]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   15.115620][  T274]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   15.115623][  T274]  ? generic_xdp_install (net/core/dev.c:11630)
[   15.115626][  T274]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   15.115629][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.115641][  T274]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   15.115650][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.115669][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.115674][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.115679][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.115683][  T274]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   15.115685][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.115690][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.115693][  T274]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   15.115697][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.115700][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.115707][  T274]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   15.115713][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.115716][  T274]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   15.115722][  T274]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   15.115729][  T274]  ? 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)
[   15.115734][  T274]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   15.115739][  T274]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   15.115742][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.115748][  T274]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   15.115752][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.115755][  T274]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   15.115769][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.115772][  T274]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   15.115780][  T274]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   15.115784][  T274]  ? __copy_msghdr (net/socket.c:2556)
[   15.115790][  T274]  ___sys_sendmsg (net/socket.c:2686)
[   15.115792][  T274]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   15.115795][  T274]  ? __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)
[   15.115804][  T274]  ? copy_msghdr_from_user (net/socket.c:2673)
[   15.115808][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.115812][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.115817][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.115821][  T274]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   15.115831][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.115837][  T274]  __sys_sendmsg (net/socket.c:2716)
[   15.115840][  T274]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   15.115844][  T274]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   15.115850][  T274]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.115854][  T274]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   15.115861][  T274]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   15.115869][  T274] RIP: 0033:0x7f91a54231d7
[   15.115878][  T274] 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)
[   15.115880][  T274] RSP: 002b:00007ffc8b719e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   15.115887][  T274] RAX: ffffffffffffffda RBX: 00007ffc8b71a590 RCX: 00007f91a54231d7
[   15.115889][  T274] RDX: 0000000000000000 RSI: 00007ffc8b719ed0 RDI: 0000000000000005
[   15.115891][  T274] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   15.115893][  T274] R10: 00007f91a531ff60 R11: 0000000000000246 R12: 0000000000000002
[   15.115894][  T274] R13: 00000000690dff25 R14: 0000000000499600 R15: 0000000000000000
| [   15.140438][  T274] refcount_t: underflow; use-after-free.
| [   15.140660][  T274] WARNING: CPU: 0 PID: 274 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   15.141010][  T274] Modules linked in:
| [   15.141466][  T274] Tainted: [B]=BAD_PAGE
[   15.141592][  T274] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.141790][  T274] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   15.142069][  T274] Code: a2 b5 02 80 fb 01 0f 87 db 6e d8 fe 83 e3 01 0f 85 51 ff ff ff c6 05 c2 a2 b5 02 01 90 48 c7 c7 60 a8 85 99 e8 72 c3 17 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 20 69 a0 ff e9 ba fe ff ff
All code
========
   0:	a2 b5 02 80 fb 01 0f 	movabs %al,0xdb870f01fb8002b5
   7:	87 db 
   9:	6e                   	outsb  %ds:(%rsi),(%dx)
   a:	d8 fe                	fdivr  %st(6),%st
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 c2 a2 b5 02 01 	movb   $0x1,0x2b5a2c2(%rip)        # 0x2b5a2de
  1c:	90                   	nop
  1d:	48 c7 c7 60 a8 85 99 	mov    $0xffffffff9985a860,%rdi
  24:	e8 72 c3 17 ff       	call   0xffffffffff17c39b
  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 20 69 a0 ff       	call   0xffffffffffa0695b
  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 20 69 a0 ff       	call   0xffffffffffa06931
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   15.142630][  T274] RSP: 0018:ffffc90000d171f0 EFLAGS: 00010286
[   15.142833][  T274] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   15.143077][  T274] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   15.143317][  T274] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff343e134
[   15.143557][  T274] R10: 0000000000000003 R11: ffffc90000d16d80 R12: 0000000000000001
[   15.143795][  T274] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   15.144039][  T274] FS:  00007f91a5255800(0000) GS:ffff88809ab81000(0000) knlGS:0000000000000000
[   15.144320][  T274] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.144524][  T274] CR2: 00007faa575705f0 CR3: 000000000be15004 CR4: 0000000000772ef0
[   15.144761][  T274] PKRU: 55555554
[   15.144889][  T274] Call Trace:
[   15.145011][  T274]  <TASK>
[   15.145098][  T274]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   15.145258][  T274]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   15.145420][  T274]  ? generic_xdp_install (net/core/dev.c:11630)
[   15.145577][  T274]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   15.145732][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.145908][  T274]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   15.146069][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.146278][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.146437][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.146597][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.146755][  T274]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   15.146920][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.147081][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.147274][  T274]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   15.147430][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.147589][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.147747][  T274]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   15.147914][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.148074][  T274]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   15.148233][  T274]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   15.148405][  T274]  ? 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)
[   15.148587][  T274]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   15.148745][  T274]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   15.148907][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.149070][  T274]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   15.149228][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.149384][  T274]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   15.149542][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.149697][  T274]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   15.149860][  T274]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   15.150065][  T274]  ? __copy_msghdr (net/socket.c:2556)
[   15.150224][  T274]  ___sys_sendmsg (net/socket.c:2686)
[   15.150384][  T274]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   15.150541][  T274]  ? __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)
[   15.150738][  T274]  ? copy_msghdr_from_user (net/socket.c:2673)
[   15.150902][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.151064][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.151223][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.151377][  T274]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   15.151537][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.151694][  T274]  __sys_sendmsg (net/socket.c:2716)
[   15.151850][  T274]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   15.152052][  T274]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   15.152213][  T274]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.152368][  T274]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   15.152525][  T274]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   15.152718][  T274] RIP: 0033:0x7f91a54231d7
[   15.152888][  T274] 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)
[   15.153446][  T274] RSP: 002b:00007ffc8b719e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   15.153688][  T274] RAX: ffffffffffffffda RBX: 00007ffc8b71a590 RCX: 00007f91a54231d7
[   15.153937][  T274] RDX: 0000000000000000 RSI: 00007ffc8b719ed0 RDI: 0000000000000005
[   15.154175][  T274] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   15.154414][  T274] R10: 00007f91a531ff60 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
refcount_warn_saturate:netdev_run_todo:rtnl_dellink:rtnetlink_rcv_msg:netlink_rcv_skb
print_report:kasan_report:kobject_put:netdev_run_todo:rtnl_dellink