======================================
| [  101.085964][ T2368] ==================================================================
| [  101.086506][ T2368] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  101.086980][ T2368] Read of size 1 at addr ffff888008c926ac by task ip/2368
| [  101.087241][ T2368]
[  101.087346][ T2368] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  101.087353][ T2368] Call Trace:
[  101.087356][ T2368]  <TASK>
[  101.087358][ T2368]  dump_stack_lvl (lib/dump_stack.c:123)
[  101.087367][ T2368]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  101.087379][ T2368]  ? kobject_put (lib/kobject.c:733)
[  101.087386][ T2368]  print_report (mm/kasan/report.c:483)
[  101.087391][ T2368]  ? kobject_put (lib/kobject.c:733)
[  101.087395][ T2368]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  101.087401][ T2368]  ? kobject_put (lib/kobject.c:733)
[  101.087406][ T2368]  kasan_report (mm/kasan/report.c:597)
[  101.087411][ T2368]  ? kobject_put (lib/kobject.c:733)
[  101.087421][ T2368]  kobject_put (lib/kobject.c:733)
[  101.087427][ T2368]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  101.087435][ T2368]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  101.087439][ T2368]  ? generic_xdp_install (net/core/dev.c:11630)
[  101.087445][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.087466][ T2368]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  101.087474][ T2368]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  101.087508][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.087516][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.087524][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.087528][ T2368]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  101.087531][ T2368]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  101.087538][ T2368]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  101.087542][ T2368]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  101.087546][ T2368]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  101.087549][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.087555][ T2368]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  101.087562][ T2368]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  101.087565][ T2368]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  101.087572][ T2368]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  101.087575][ T2368]  ? 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)
[  101.087579][ T2368]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  101.087583][ T2368]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  101.087587][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.087592][ T2368]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  101.087597][ T2368]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  101.087600][ T2368]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  101.087607][ T2368]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  101.087611][ T2368]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  101.087618][ T2368]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  101.087621][ T2368]  ? __copy_msghdr (net/socket.c:2556)
[  101.087629][ T2368]  ___sys_sendmsg (net/socket.c:2686)
[  101.087632][ T2368]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  101.087635][ T2368]  ? __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)
[  101.087645][ T2368]  ? copy_msghdr_from_user (net/socket.c:2673)
[  101.087653][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.087660][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.087669][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.087675][ T2368]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  101.087689][ T2368]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  101.087700][ T2368]  __sys_sendmsg (net/socket.c:2716)
[  101.087705][ T2368]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  101.087711][ T2368]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  101.087725][ T2368]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  101.087731][ T2368]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  101.087740][ T2368]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  101.087746][ T2368] RIP: 0033:0x7f36ba0e91d7
[  101.087757][ T2368] 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)
[  101.087762][ T2368] RSP: 002b:00007ffde2cc33b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  101.087770][ T2368] RAX: ffffffffffffffda RBX: 00007ffde2cc3ae0 RCX: 00007f36ba0e91d7
[  101.087774][ T2368] RDX: 0000000000000000 RSI: 00007ffde2cc3420 RDI: 0000000000000005
[  101.087776][ T2368] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  101.087779][ T2368] R10: 00007f36b9fe5f60 R11: 0000000000000246 R12: 0000000000000002
[  101.087781][ T2368] R13: 00000000690de5fd R14: 0000000000499600 R15: 0000000000000000
| [  101.130093][ T2368] refcount_t: underflow; use-after-free.
| [  101.130328][ T2368] WARNING: CPU: 0 PID: 2368 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  101.130643][ T2368] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress vrf veth
| [  101.131555][ T2368] Tainted: [B]=BAD_PAGE
[  101.131697][ T2368] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  101.132022][ T2368] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  101.132264][ T2368] 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 8f 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 8f 	mov    $0xffffffff8f458d60,%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
[  101.133016][ T2368] RSP: 0018:ffffc90004f2f1f0 EFLAGS: 00010286
[  101.133249][ T2368] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  101.133521][ T2368] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  101.134122][ T2368] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1fbe134
[  101.134567][ T2368] R10: 0000000000000003 R11: ffffc90004f2ed80 R12: 0000000000000001
[  101.135174][ T2368] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  101.135628][ T2368] FS:  00007f36b9f1b800(0000) GS:ffff88809f3f2000(0000) knlGS:0000000000000000
[  101.136136][ T2368] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  101.136709][ T2368] CR2: 00000000004e57a0 CR3: 0000000009dd6003 CR4: 0000000000772ef0
[  101.137166][ T2368] PKRU: 55555554
[  101.137401][ T2368] Call Trace:
[  101.137622][ T2368]  <TASK>
[  101.137951][ T2368]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  101.138262][ T2368]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  101.138550][ T2368]  ? generic_xdp_install (net/core/dev.c:11630)
[  101.138843][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.139317][ T2368]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  101.139607][ T2368]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  101.139987][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.140292][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.140761][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.141048][ T2368]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  101.141532][ T2368]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  101.141823][ T2368]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  101.142359][ T2368]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  101.142640][ T2368]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  101.142926][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.143259][ T2368]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  101.143563][ T2368]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  101.143850][ T2368]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  101.144136][ T2368]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  101.144614][ T2368]  ? 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)
[  101.144903][ T2368]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  101.145207][ T2368]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  101.145499][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.145787][ T2368]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  101.146258][ T2368]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  101.146548][ T2368]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  101.146850][ T2368]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  101.147131][ T2368]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  101.147483][ T2368]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  101.147768][ T2368]  ? __copy_msghdr (net/socket.c:2556)
[  101.148023][ T2368]  ___sys_sendmsg (net/socket.c:2686)
[  101.148281][ T2368]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  101.148537][ T2368]  ? __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)
[  101.148876][ T2368]  ? copy_msghdr_from_user (net/socket.c:2673)
[  101.149160][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.149467][ T2368]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  101.149760][ T2368]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  101.150043][ T2368]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  101.150337][ T2368]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  101.150632][ T2368]  __sys_sendmsg (net/socket.c:2716)
[  101.150910][ T2368]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  101.151279][ T2368]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  101.151574][ T2368]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  101.152032][ T2368]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  101.152322][ T2368]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  101.152675][ T2368] RIP: 0033:0x7f36ba0e91d7
[  101.152982][ T2368] 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)
[  101.154192][ T2368] RSP: 002b:00007ffde2cc33b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  101.154844][ T2368] RAX: ffffffffffffffda RBX: 00007ffde2cc3ae0 RCX: 00007f36ba0e91d7
[  101.155280][ T2368] RDX: 0000000000000000 RSI: 00007ffde2cc3420 RDI: 0000000000000005
[  101.155723][ T2368] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  101.156372][ T2368] R10: 00007f36b9fe5f60 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