======================================
| [   41.327432][  T418] ==================================================================
| [   41.327723][  T418] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   41.327973][  T418] Read of size 1 at addr ffff88800f1fc6ac by task ip/418
| [   41.328195][  T418]
[   41.328304][  T418] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   41.328307][  T418] Call Trace:
[   41.328309][  T418]  <TASK>
[   41.328311][  T418]  dump_stack_lvl (lib/dump_stack.c:123)
[   41.328318][  T418]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   41.328325][  T418]  ? kobject_put (lib/kobject.c:733)
[   41.328330][  T418]  print_report (mm/kasan/report.c:483)
[   41.328333][  T418]  ? kobject_put (lib/kobject.c:733)
[   41.328336][  T418]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   41.328339][  T418]  ? kobject_put (lib/kobject.c:733)
[   41.328342][  T418]  kasan_report (mm/kasan/report.c:597)
[   41.328346][  T418]  ? kobject_put (lib/kobject.c:733)
[   41.328352][  T418]  kobject_put (lib/kobject.c:733)
[   41.328355][  T418]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   41.328361][  T418]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   41.328364][  T418]  ? generic_xdp_install (net/core/dev.c:11630)
[   41.328367][  T418]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   41.328369][  T418]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   41.328376][  T418]  ? net_generic (./include/net/netns/generic.h:51)
[   41.328381][  T418]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   41.328387][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   41.328409][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.328417][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.328424][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.328427][  T418]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   41.328430][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   41.328435][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   41.328438][  T418]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   41.328442][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   41.328444][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.328451][  T418]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   41.328457][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   41.328461][  T418]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   41.328467][  T418]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   41.328470][  T418]  ? 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)
[   41.328474][  T418]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   41.328478][  T418]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   41.328482][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.328487][  T418]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   41.328492][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   41.328496][  T418]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   41.328503][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   41.328507][  T418]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   41.328513][  T418]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   41.328516][  T418]  ? __copy_msghdr (net/socket.c:2556)
[   41.328523][  T418]  ___sys_sendmsg (net/socket.c:2686)
[   41.328526][  T418]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   41.328529][  T418]  ? __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)
[   41.328537][  T418]  ? copy_msghdr_from_user (net/socket.c:2673)
[   41.328542][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.328546][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.328552][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.328555][  T418]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   41.328561][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   41.328567][  T418]  __sys_sendmsg (net/socket.c:2716)
[   41.328570][  T418]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   41.328574][  T418]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   41.328582][  T418]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   41.328586][  T418]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   41.328592][  T418]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   41.328597][  T418] RIP: 0033:0x7f548f0d91d7
[   41.328602][  T418] 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)
[   41.328606][  T418] RSP: 002b:00007ffc038dc418 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   41.328610][  T418] RAX: ffffffffffffffda RBX: 00007ffc038dcb40 RCX: 00007f548f0d91d7
[   41.328612][  T418] RDX: 0000000000000000 RSI: 00007ffc038dc480 RDI: 0000000000000005
[   41.328614][  T418] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   41.328616][  T418] R10: 00007f548efd5f60 R11: 0000000000000246 R12: 0000000000000002
[   41.328618][  T418] R13: 00000000690dfaa3 R14: 0000000000499600 R15: 0000000000000000
| [   41.355589][  T418] refcount_t: underflow; use-after-free.
| [   41.355799][  T418] WARNING: CPU: 2 PID: 418 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   41.356137][  T418] Modules linked in: ip_gre gre 8021q vrf veth
| [   41.357524][  T418] Tainted: [B]=BAD_PAGE
[   41.357672][  T418] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   41.357894][  T418] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   41.358157][  T418] 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 45 87 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 45 87 	mov    $0xffffffff87458d60,%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
[   41.358817][  T418] RSP: 0018:ffffc90000b971f0 EFLAGS: 00010286
[   41.359070][  T418] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   41.359358][  T418] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   41.359629][  T418] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0fbe134
[   41.359901][  T418] R10: 0000000000000003 R11: ffffc90000b96d80 R12: 0000000000000001
[   41.360179][  T418] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   41.360473][  T418] FS:  00007f548ef0b800(0000) GS:ffff8880a74f2000(0000) knlGS:0000000000000000
[   41.360786][  T418] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   41.361028][  T418] CR2: 00007f02a0253000 CR3: 000000000bd78004 CR4: 0000000000772ef0
[   41.361313][  T418] PKRU: 55555554
[   41.361470][  T418] Call Trace:
[   41.361617][  T418]  <TASK>
[   41.361725][  T418]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   41.361925][  T418]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   41.362126][  T418]  ? generic_xdp_install (net/core/dev.c:11630)
[   41.362330][  T418]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   41.362618][  T418]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   41.362807][  T418]  ? net_generic (./include/net/netns/generic.h:51)
[   41.363006][  T418]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   41.363195][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   41.363556][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.363744][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.363931][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.364228][  T418]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   41.364427][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   41.364612][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   41.364836][  T418]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   41.365137][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   41.365334][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.365528][  T418]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   41.365715][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   41.365904][  T418]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   41.366102][  T418]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   41.366300][  T418]  ? 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)
[   41.366497][  T418]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   41.366802][  T418]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   41.366988][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.367181][  T418]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   41.367378][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   41.367660][  T418]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   41.367847][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   41.368076][  T418]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   41.368275][  T418]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   41.368601][  T418]  ? __copy_msghdr (net/socket.c:2556)
[   41.368789][  T418]  ___sys_sendmsg (net/socket.c:2686)
[   41.368977][  T418]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   41.369171][  T418]  ? __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)
[   41.369510][  T418]  ? copy_msghdr_from_user (net/socket.c:2673)
[   41.369698][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.369879][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   41.370072][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   41.370365][  T418]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   41.370567][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   41.370760][  T418]  __sys_sendmsg (net/socket.c:2716)
[   41.370945][  T418]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   41.371293][  T418]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   41.371491][  T418]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   41.371674][  T418]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   41.371960][  T418]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   41.372196][  T418] RIP: 0033:0x7f548f0d91d7
[   41.372416][  T418] 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)
[   41.373129][  T418] RSP: 002b:00007ffc038dc418 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   41.373426][  T418] RAX: ffffffffffffffda RBX: 00007ffc038dcb40 RCX: 00007f548f0d91d7
[   41.373796][  T418] RDX: 0000000000000000 RSI: 00007ffc038dc480 RDI: 0000000000000005
[   41.374070][  T418] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   41.374352][  T418] R10: 00007f548efd5f60 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