======================================
| [   40.420857][  T418] ==================================================================
| [   40.421178][  T418] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   40.421447][  T418] Read of size 1 at addr ffff888008d3c6ac by task ip/418
| [   40.421678][  T418]
[   40.421777][  T418] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   40.421780][  T418] Call Trace:
[   40.421782][  T418]  <TASK>
[   40.421784][  T418]  dump_stack_lvl (lib/dump_stack.c:123)
[   40.421790][  T418]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   40.421797][  T418]  ? kobject_put (lib/kobject.c:733)
[   40.421801][  T418]  print_report (mm/kasan/report.c:483)
[   40.421804][  T418]  ? kobject_put (lib/kobject.c:733)
[   40.421807][  T418]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   40.421811][  T418]  ? kobject_put (lib/kobject.c:733)
[   40.421814][  T418]  kasan_report (mm/kasan/report.c:597)
[   40.421817][  T418]  ? kobject_put (lib/kobject.c:733)
[   40.421823][  T418]  kobject_put (lib/kobject.c:733)
[   40.421826][  T418]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   40.421832][  T418]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   40.421835][  T418]  ? generic_xdp_install (net/core/dev.c:11630)
[   40.421838][  T418]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   40.421840][  T418]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   40.421847][  T418]  ? net_generic (./include/net/netns/generic.h:51)
[   40.421852][  T418]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   40.421860][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   40.421878][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.421886][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.421893][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.421897][  T418]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   40.421900][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   40.421905][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   40.421908][  T418]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   40.421912][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   40.421914][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.421921][  T418]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   40.421926][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   40.421930][  T418]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   40.421937][  T418]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   40.421939][  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)
[   40.421943][  T418]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   40.421947][  T418]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   40.421951][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.421957][  T418]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   40.421962][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   40.421965][  T418]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   40.421973][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   40.421977][  T418]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   40.421984][  T418]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   40.421987][  T418]  ? __copy_msghdr (net/socket.c:2556)
[   40.421996][  T418]  ___sys_sendmsg (net/socket.c:2686)
[   40.421999][  T418]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   40.422002][  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)
[   40.422011][  T418]  ? copy_msghdr_from_user (net/socket.c:2673)
[   40.422015][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.422020][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.422025][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.422029][  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)
[   40.422034][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   40.422040][  T418]  __sys_sendmsg (net/socket.c:2716)
[   40.422043][  T418]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   40.422047][  T418]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   40.422055][  T418]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   40.422058][  T418]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   40.422064][  T418]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   40.422068][  T418] RIP: 0033:0x7fabcddb51d7
[   40.422074][  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)
[   40.422077][  T418] RSP: 002b:00007ffc8165d238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   40.422083][  T418] RAX: ffffffffffffffda RBX: 00007ffc8165d960 RCX: 00007fabcddb51d7
[   40.422086][  T418] RDX: 0000000000000000 RSI: 00007ffc8165d2a0 RDI: 0000000000000005
[   40.422088][  T418] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   40.422089][  T418] R10: 00007fabcdcb1f60 R11: 0000000000000246 R12: 0000000000000002
[   40.422091][  T418] R13: 00000000690dfa3f R14: 0000000000499600 R15: 0000000000000000
| [   40.451195][  T418] refcount_t: underflow; use-after-free.
| [   40.451419][  T418] WARNING: CPU: 2 PID: 418 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   40.451761][  T418] Modules linked in: ip_gre gre 8021q vrf veth
| [   40.452407][  T418] Tainted: [B]=BAD_PAGE
[   40.452566][  T418] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   40.452819][  T418] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   40.453069][  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 c5 ae 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 c5 ae 	mov    $0xffffffffaec58d60,%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
[   40.453731][  T418] RSP: 0018:ffffc90000a271f0 EFLAGS: 00010286
[   40.453995][  T418] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   40.454281][  T418] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   40.454573][  T418] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5ebe134
[   40.454869][  T418] R10: 0000000000000003 R11: ffffc90000a26d80 R12: 0000000000000001
[   40.455154][  T418] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   40.455440][  T418] FS:  00007fabcdbe7800(0000) GS:ffff8880858f2000(0000) knlGS:0000000000000000
[   40.455776][  T418] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   40.456025][  T418] CR2: 00000000004061e9 CR3: 000000000bba1004 CR4: 0000000000772ef0
[   40.456313][  T418] PKRU: 55555554
[   40.456469][  T418] Call Trace:
[   40.456623][  T418]  <TASK>
[   40.456738][  T418]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   40.456953][  T418]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   40.457155][  T418]  ? generic_xdp_install (net/core/dev.c:11630)
[   40.457362][  T418]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   40.457568][  T418]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   40.457777][  T418]  ? net_generic (./include/net/netns/generic.h:51)
[   40.457979][  T418]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   40.458178][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   40.458436][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.458638][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.458855][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.459052][  T418]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   40.459247][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   40.459441][  T418]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   40.459678][  T418]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   40.459883][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   40.460089][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.460295][  T418]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   40.460498][  T418]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   40.460693][  T418]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   40.460903][  T418]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   40.461098][  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)
[   40.461293][  T418]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   40.461490][  T418]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   40.461686][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.461906][  T418]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   40.462102][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   40.462296][  T418]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   40.462493][  T418]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   40.462687][  T418]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   40.462895][  T418]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   40.463131][  T418]  ? __copy_msghdr (net/socket.c:2556)
[   40.463349][  T418]  ___sys_sendmsg (net/socket.c:2686)
[   40.463555][  T418]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   40.463750][  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)
[   40.463998][  T418]  ? copy_msghdr_from_user (net/socket.c:2673)
[   40.464197][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.464392][  T418]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   40.464584][  T418]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   40.464786][  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)
[   40.464986][  T418]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   40.465195][  T418]  __sys_sendmsg (net/socket.c:2716)
[   40.465390][  T418]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   40.465625][  T418]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   40.465838][  T418]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   40.466033][  T418]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   40.466229][  T418]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   40.466469][  T418] RIP: 0033:0x7fabcddb51d7
[   40.466675][  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)
[   40.467340][  T418] RSP: 002b:00007ffc8165d238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   40.467628][  T418] RAX: ffffffffffffffda RBX: 00007ffc8165d960 RCX: 00007fabcddb51d7
[   40.467918][  T418] RDX: 0000000000000000 RSI: 00007ffc8165d2a0 RDI: 0000000000000005
[   40.468200][  T418] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   40.468470][  T418] R10: 00007fabcdcb1f60 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