======================================
| xx__-> [   15.301558][  T276] ==================================================================
| [   15.301871][  T276] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   15.302177][  T276] Read of size 1 at addr ffff8880052aa6c4 by task ip/276
| [   15.302405][  T276]
[   15.302505][  T276] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.302507][  T276] Call Trace:
[   15.302509][  T276]  <TASK>
[   15.302511][  T276]  dump_stack_lvl (lib/dump_stack.c:123)
[   15.302518][  T276]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   15.302527][  T276]  ? kobject_put (lib/kobject.c:733)
[   15.302531][  T276]  print_report (mm/kasan/report.c:483)
[   15.302534][  T276]  ? kobject_put (lib/kobject.c:733)
[   15.302537][  T276]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   15.302541][  T276]  ? kobject_put (lib/kobject.c:733)
[   15.302544][  T276]  kasan_report (mm/kasan/report.c:597)
[   15.302548][  T276]  ? kobject_put (lib/kobject.c:733)
[   15.302553][  T276]  kobject_put (lib/kobject.c:733)
[   15.302556][  T276]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   15.302565][  T276]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   15.302568][  T276]  ? generic_xdp_install (net/core/dev.c:11630)
[   15.302572][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.302579][  T276]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   15.302585][  T276]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.302613][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.302624][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.302629][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.302633][  T276]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   15.302636][  T276]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.302639][  T276]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.302643][  T276]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   15.302647][  T276]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.302651][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.302657][  T276]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   15.302661][  T276]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.302665][  T276]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   15.302671][  T276]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   15.302674][  T276]  ? 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)
[   15.302678][  T276]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   15.302682][  T276]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   15.302685][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.302690][  T276]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   15.302694][  T276]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.302697][  T276]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   15.302704][  T276]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.302707][  T276]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   15.302712][  T276]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   15.302714][  T276]  ? __copy_msghdr (net/socket.c:2556)
[   15.302722][  T276]  ___sys_sendmsg (net/socket.c:2686)
[   15.302725][  T276]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   15.302729][  T276]  ? __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)
[   15.302734][  T276]  ? copy_msghdr_from_user (net/socket.c:2673)
[   15.302739][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.302743][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.302748][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.302752][  T276]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   15.302760][  T276]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.302765][  T276]  __sys_sendmsg (net/socket.c:2716)
[   15.302767][  T276]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   15.302770][  T276]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   15.302777][  T276]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.302784][  T276]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   15.302791][  T276]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   15.302795][  T276] RIP: 0033:0x7f75e32131d7
[   15.302799][  T276] 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)
[   15.302802][  T276] RSP: 002b:00007fff82c27408 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   15.302806][  T276] RAX: ffffffffffffffda RBX: 00007fff82c27b30 RCX: 00007f75e32131d7
[   15.302808][  T276] RDX: 0000000000000000 RSI: 00007fff82c27470 RDI: 0000000000000005
[   15.302810][  T276] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   15.302812][  T276] R10: 00007f75e310ff60 R11: 0000000000000246 R12: 0000000000000002
[   15.302814][  T276] R13: 00000000690e05ad R14: 0000000000499600 R15: 0000000000000000
| [   15.330704][  T276] refcount_t: underflow; use-after-free.
| [   15.331245][  T276] WARNING: CPU: 0 PID: 276 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   15.331558][  T276] Modules linked in: vxlan
| [   15.332120][  T276] Tainted: [B]=BAD_PAGE
[   15.332264][  T276] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.332480][  T276] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   15.332713][  T276] 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 e5 aa 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 e5 aa 	mov    $0xffffffffaae5ba40,%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
[   15.333363][  T276] RSP: 0018:ffffc90000ae71f0 EFLAGS: 00010286
[   15.333581][  T276] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   15.333867][  T276] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   15.334144][  T276] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff57c0934
[   15.334500][  T276] R10: 0000000000000003 R11: ffffc90000ae6d80 R12: 0000000000000001
[   15.334770][  T276] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   15.335045][  T276] FS:  00007f75e3045800(0000) GS:ffff8880bfd08000(0000) knlGS:0000000000000000
[   15.335459][  T276] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.335687][  T276] CR2: 00000000004e5d20 CR3: 000000001186e001 CR4: 0000000000772ef0
[   15.336061][  T276] PKRU: 55555554
[   15.336206][  T276] Call Trace:
[   15.336334][  T276]  <TASK>
[   15.336422][  T276]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   15.336601][  T276]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   15.336789][  T276]  ? generic_xdp_install (net/core/dev.c:11630)
[   15.337074][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.337263][  T276]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   15.337434][  T276]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.337756][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.337939][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.338122][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.338302][  T276]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   15.338570][  T276]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.338753][  T276]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   15.338977][  T276]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   15.339172][  T276]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.339524][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.339704][  T276]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   15.339892][  T276]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   15.340072][  T276]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   15.340354][  T276]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   15.340522][  T276]  ? 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)
[   15.340702][  T276]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   15.340890][  T276]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   15.341174][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.341352][  T276]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   15.341525][  T276]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.341703][  T276]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   15.341982][  T276]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   15.342174][  T276]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   15.342347][  T276]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   15.342557][  T276]  ? __copy_msghdr (net/socket.c:2556)
[   15.342836][  T276]  ___sys_sendmsg (net/socket.c:2686)
[   15.343091][  T276]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   15.343279][  T276]  ? __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)
[   15.343493][  T276]  ? copy_msghdr_from_user (net/socket.c:2673)
[   15.343674][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.343966][  T276]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   15.344154][  T276]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   15.344418][  T276]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   15.344589][  T276]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   15.344780][  T276]  __sys_sendmsg (net/socket.c:2716)
[   15.345047][  T276]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   15.345367][  T276]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   15.345540][  T276]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   15.345724][  T276]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   15.345970][  T276]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   15.346203][  T276] RIP: 0033:0x7f75e32131d7
[   15.346379][  T276] 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)
[   15.347111][  T276] RSP: 002b:00007fff82c27408 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   15.347382][  T276] RAX: ffffffffffffffda RBX: 00007fff82c27b30 RCX: 00007f75e32131d7
[   15.347653][  T276] RDX: 0000000000000000 RSI: 00007fff82c27470 RDI: 0000000000000005
[   15.347984][  T276] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   15.348267][  T276] R10: 00007f75e310ff60 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