======================================
| [   51.278201][  T436] ==================================================================
| [   51.278677][  T436] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   51.279049][  T436] Read of size 1 at addr ffff8880085d16c4 by task ip/436
| [   51.279335][  T436]
[   51.279452][  T436] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   51.279455][  T436] Call Trace:
[   51.279457][  T436]  <TASK>
[   51.279459][  T436]  dump_stack_lvl (lib/dump_stack.c:123)
[   51.279469][  T436]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   51.279477][  T436]  ? kobject_put (lib/kobject.c:733)
[   51.279482][  T436]  print_report (mm/kasan/report.c:483)
[   51.279485][  T436]  ? kobject_put (lib/kobject.c:733)
[   51.279488][  T436]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   51.279492][  T436]  ? kobject_put (lib/kobject.c:733)
[   51.279495][  T436]  kasan_report (mm/kasan/report.c:597)
[   51.279499][  T436]  ? kobject_put (lib/kobject.c:733)
[   51.279505][  T436]  kobject_put (lib/kobject.c:733)
[   51.279508][  T436]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   51.279516][  T436]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   51.279520][  T436]  ? generic_xdp_install (net/core/dev.c:11630)
[   51.279523][  T436]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   51.279530][  T436]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   51.279535][  T436]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.279555][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.279564][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.279570][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.279574][  T436]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   51.279577][  T436]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.279580][  T436]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.279584][  T436]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   51.279589][  T436]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.279592][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.279598][  T436]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   51.279604][  T436]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.279608][  T436]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   51.279614][  T436]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   51.279617][  T436]  ? 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)
[   51.279621][  T436]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   51.279628][  T436]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   51.279633][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.279640][  T436]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   51.279646][  T436]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.279649][  T436]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   51.279655][  T436]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.279658][  T436]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   51.279662][  T436]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   51.279665][  T436]  ? __copy_msghdr (net/socket.c:2556)
[   51.279672][  T436]  ___sys_sendmsg (net/socket.c:2686)
[   51.279674][  T436]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   51.279678][  T436]  ? __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)
[   51.279682][  T436]  ? copy_msghdr_from_user (net/socket.c:2673)
[   51.279686][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.279691][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.279699][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.279704][  T436]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   51.279712][  T436]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.279717][  T436]  __sys_sendmsg (net/socket.c:2716)
[   51.279720][  T436]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   51.279723][  T436]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   51.279730][  T436]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   51.279737][  T436]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   51.279743][  T436]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   51.279747][  T436] RIP: 0033:0x7f8512d351d7
[   51.279755][  T436] 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)
[   51.279759][  T436] RSP: 002b:00007ffe76860058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   51.279764][  T436] RAX: ffffffffffffffda RBX: 00007ffe76860780 RCX: 00007f8512d351d7
[   51.279766][  T436] RDX: 0000000000000000 RSI: 00007ffe768600c0 RDI: 0000000000000005
[   51.279768][  T436] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   51.279771][  T436] R10: 00007f8512c31f60 R11: 0000000000000246 R12: 0000000000000001
[   51.279772][  T436] R13: 00000000690deab0 R14: 0000000000499600 R15: 0000000000000000
| [   51.310231][  T436] refcount_t: underflow; use-after-free.
| [   51.310536][  T436] WARNING: CPU: 2 PID: 436 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   51.310970][  T436] Modules linked in: openvswitch psample nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nsh
| [   51.311768][  T436] Tainted: [B]=BAD_PAGE
[   51.311949][  T436] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   51.312212][  T436] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   51.312512][  T436] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 65 9e e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
All code
========
   0:	cc                   	int3
   1:	38 03                	cmp    %al,(%rbx)
   3:	80 fb 01             	cmp    $0x1,%bl
   6:	0f 87 29 33 d7 fe    	ja     0xfffffffffed73335
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 17 cc 38 03 01 	movb   $0x1,0x338cc17(%rip)        # 0x338cc33
  1c:	90                   	nop
  1d:	48 c7 c7 40 ba 65 9e 	mov    $0xffffffff9e65ba40,%rdi
  24:	e8 62 d6 16 ff       	call   0xffffffffff16d68b
  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 c0 9d a0 ff       	call   0xffffffffffa09dfb
  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 c0 9d a0 ff       	call   0xffffffffffa09dd1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   51.313263][  T436] RSP: 0018:ffffc90000c3f1f0 EFLAGS: 00010286
[   51.313527][  T436] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   51.313867][  T436] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   51.314210][  T436] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3ec0934
[   51.314646][  T436] R10: 0000000000000003 R11: ffffc90000c3ed80 R12: 0000000000000001
[   51.315065][  T436] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   51.315350][  T436] FS:  00007f8512b67800(0000) GS:ffff8880c6208000(0000) knlGS:0000000000000000
[   51.315717][  T436] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   51.315976][  T436] CR2: 00007f8512f35050 CR3: 000000000ddfa004 CR4: 0000000000772ef0
[   51.316273][  T436] PKRU: 55555554
[   51.316451][  T436] Call Trace:
[   51.316636][  T436]  <TASK>
[   51.316749][  T436]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   51.317060][  T436]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   51.317280][  T436]  ? generic_xdp_install (net/core/dev.c:11630)
[   51.317500][  T436]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   51.317704][  T436]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   51.318016][  T436]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.318281][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.318586][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.318916][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.319394][  T436]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   51.319604][  T436]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.319807][  T436]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.320161][  T436]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   51.320376][  T436]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.320584][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.320791][  T436]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   51.321115][  T436]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.321330][  T436]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   51.321544][  T436]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   51.321755][  T436]  ? 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)
[   51.322143][  T436]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   51.322413][  T436]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   51.322772][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.323118][  T436]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   51.323364][  T436]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.323683][  T436]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   51.323895][  T436]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.324105][  T436]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   51.324315][  T436]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   51.324682][  T436]  ? __copy_msghdr (net/socket.c:2556)
[   51.324897][  T436]  ___sys_sendmsg (net/socket.c:2686)
[   51.325122][  T436]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   51.325346][  T436]  ? __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)
[   51.325610][  T436]  ? copy_msghdr_from_user (net/socket.c:2673)
[   51.325821][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.326052][  T436]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.326372][  T436]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.326593][  T436]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   51.326811][  T436]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.327035][  T436]  __sys_sendmsg (net/socket.c:2716)
[   51.327342][  T436]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   51.327592][  T436]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   51.327786][  T436]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   51.327986][  T436]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   51.328265][  T436]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   51.328498][  T436] RIP: 0033:0x7f8512d351d7
[   51.328700][  T436] 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)
[   51.329453][  T436] RSP: 002b:00007ffe76860058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   51.329760][  T436] RAX: ffffffffffffffda RBX: 00007ffe76860780 RCX: 00007f8512d351d7
[   51.330166][  T436] RDX: 0000000000000000 RSI: 00007ffe768600c0 RDI: 0000000000000005
[   51.330457][  T436] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   51.330845][  T436] R10: 00007f8512c31f60 R11: 0000000000000246 R12: 0000000000000001


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