======================================
| xx__-> [ 1952.564661][T17218] ==================================================================
| [ 1952.565127][T17218] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [ 1952.565538][T17218] Read of size 1 at addr ffff888007df16ac by task ip/17218
| [ 1952.565922][T17218]
[ 1952.566075][T17218] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1952.566078][T17218] Call Trace:
[ 1952.566082][T17218]  <TASK>
[ 1952.566085][T17218]  dump_stack_lvl (lib/dump_stack.c:123)
[ 1952.566093][T17218]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 1952.566102][T17218]  ? kobject_put (lib/kobject.c:733)
[ 1952.566108][T17218]  print_report (mm/kasan/report.c:483)
[ 1952.566113][T17218]  ? kobject_put (lib/kobject.c:733)
[ 1952.566117][T17218]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[ 1952.566122][T17218]  ? kobject_put (lib/kobject.c:733)
[ 1952.566126][T17218]  kasan_report (mm/kasan/report.c:597)
[ 1952.566132][T17218]  ? kobject_put (lib/kobject.c:733)
[ 1952.566141][T17218]  kobject_put (lib/kobject.c:733)
[ 1952.566146][T17218]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[ 1952.566153][T17218]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[ 1952.566158][T17218]  ? generic_xdp_install (net/core/dev.c:11630)
[ 1952.566163][T17218]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[ 1952.566177][T17218]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[ 1952.566184][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.566197][T17218]  rtnl_dellink (net/core/rtnetlink.c:3580)
[ 1952.566205][T17218]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1952.566237][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.566245][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.566253][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.566258][T17218]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[ 1952.566263][T17218]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1952.566270][T17218]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1952.566275][T17218]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[ 1952.566281][T17218]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1952.566285][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.566296][T17218]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1952.566302][T17218]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1952.566308][T17218]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[ 1952.566318][T17218]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[ 1952.566323][T17218]  ? 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)
[ 1952.566329][T17218]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1952.566335][T17218]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[ 1952.566340][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.566347][T17218]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1952.566353][T17218]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1952.566358][T17218]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[ 1952.566367][T17218]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1952.566372][T17218]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[ 1952.566379][T17218]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[ 1952.566383][T17218]  ? __copy_msghdr (net/socket.c:2556)
[ 1952.566394][T17218]  ___sys_sendmsg (net/socket.c:2686)
[ 1952.566399][T17218]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[ 1952.566403][T17218]  ? __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)
[ 1952.566414][T17218]  ? copy_msghdr_from_user (net/socket.c:2673)
[ 1952.566422][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.566429][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.566439][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.566444][T17218]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[ 1952.566453][T17218]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1952.566464][T17218]  __sys_sendmsg (net/socket.c:2716)
[ 1952.566468][T17218]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[ 1952.566474][T17218]  ? __sys_sendmsg_sock (net/socket.c:2701)
[ 1952.566487][T17218]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 1952.566493][T17218]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1952.566502][T17218]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1952.566508][T17218] RIP: 0033:0x7f8f58e1f1d7
[ 1952.566516][T17218] 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)
[ 1952.566520][T17218] RSP: 002b:00007ffc0df1ae38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1952.566526][T17218] RAX: ffffffffffffffda RBX: 00007ffc0df1b560 RCX: 00007f8f58e1f1d7
[ 1952.566530][T17218] RDX: 0000000000000000 RSI: 00007ffc0df1aea0 RDI: 0000000000000005
[ 1952.566533][T17218] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1952.566535][T17218] R10: 00007f8f58d1bf60 R11: 0000000000000246 R12: 0000000000000002
[ 1952.566538][T17218] R13: 00000000690de9fc R14: 0000000000499600 R15: 0000000000000000
| [ 1952.604061][T17218] refcount_t: underflow; use-after-free.
| [ 1952.604266][T17218] WARNING: CPU: 1 PID: 17218 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [ 1952.604706][T17218] Modules linked in: vrf veth
| [ 1952.605302][T17218] Tainted: [B]=BAD_PAGE
[ 1952.605443][T17218] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1952.605684][T17218] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[ 1952.605952][T17218] 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 65 a8 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 65 a8 	mov    $0xffffffffa8658d60,%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
[ 1952.606727][T17218] RSP: 0018:ffffc90005ea71f0 EFLAGS: 00010286
[ 1952.607069][T17218] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 1952.607347][T17218] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 1952.607639][T17218] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff51fe134
[ 1952.608032][T17218] R10: 0000000000000003 R11: ffffc90005ea6d80 R12: 0000000000000001
[ 1952.608312][T17218] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 1952.608601][T17218] FS:  00007f8f58c51800(0000) GS:ffff88808be72000(0000) knlGS:0000000000000000
[ 1952.608936][T17218] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1952.609175][T17218] CR2: 00007fa7196d4000 CR3: 000000000a505006 CR4: 0000000000772ef0
[ 1952.609583][T17218] PKRU: 55555554
[ 1952.609737][T17218] Call Trace:
[ 1952.609874][T17218]  <TASK>
[ 1952.609983][T17218]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[ 1952.610172][T17218]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[ 1952.610465][T17218]  ? generic_xdp_install (net/core/dev.c:11630)
[ 1952.610683][T17218]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[ 1952.610877][T17218]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[ 1952.611113][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.611401][T17218]  rtnl_dellink (net/core/rtnetlink.c:3580)
[ 1952.611598][T17218]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1952.611838][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.612035][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.612215][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.612425][T17218]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[ 1952.612624][T17218]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1952.612824][T17218]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[ 1952.613058][T17218]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[ 1952.613245][T17218]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1952.613534][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.613737][T17218]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[ 1952.613945][T17218]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[ 1952.614221][T17218]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[ 1952.614415][T17218]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[ 1952.614629][T17218]  ? 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)
[ 1952.614925][T17218]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[ 1952.615112][T17218]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[ 1952.615298][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.615482][T17218]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[ 1952.615689][T17218]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1952.615882][T17218]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[ 1952.616080][T17218]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[ 1952.616278][T17218]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[ 1952.616582][T17218]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[ 1952.616816][T17218]  ? __copy_msghdr (net/socket.c:2556)
[ 1952.617011][T17218]  ___sys_sendmsg (net/socket.c:2686)
[ 1952.617391][T17218]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[ 1952.617595][T17218]  ? __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)
[ 1952.617833][T17218]  ? copy_msghdr_from_user (net/socket.c:2673)
[ 1952.618025][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.618298][T17218]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1952.618474][T17218]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1952.618665][T17218]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[ 1952.618856][T17218]  ? __lock_release (kernel/locking/lockdep.c:5536)
[ 1952.619136][T17218]  __sys_sendmsg (net/socket.c:2716)
[ 1952.619313][T17218]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[ 1952.619552][T17218]  ? __sys_sendmsg_sock (net/socket.c:2701)
[ 1952.619839][T17218]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 1952.620031][T17218]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1952.620210][T17218]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1952.620428][T17218] RIP: 0033:0x7f8f58e1f1d7
[ 1952.620640][T17218] 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)
[ 1952.621281][T17218] RSP: 002b:00007ffc0df1ae38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1952.621665][T17218] RAX: ffffffffffffffda RBX: 00007ffc0df1b560 RCX: 00007f8f58e1f1d7
[ 1952.621952][T17218] RDX: 0000000000000000 RSI: 00007ffc0df1aea0 RDI: 0000000000000005
[ 1952.622310][T17218] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 1952.622588][T17218] R10: 00007f8f58d1bf60 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