======================================
| [  218.791849][  T576] ==================================================================
| [  218.792167][  T576] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  218.792505][  T576] Read of size 1 at addr ffff88800bc516ac by task ip/576
| [  218.792764][  T576]
[  218.792897][  T576] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  218.792901][  T576] Call Trace:
[  218.792903][  T576]  <TASK>
[  218.792904][  T576]  dump_stack_lvl (lib/dump_stack.c:123)
[  218.792913][  T576]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  218.792929][  T576]  ? kobject_put (lib/kobject.c:733)
[  218.792933][  T576]  print_report (mm/kasan/report.c:483)
[  218.792936][  T576]  ? kobject_put (lib/kobject.c:733)
[  218.792940][  T576]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  218.792943][  T576]  ? kobject_put (lib/kobject.c:733)
[  218.792946][  T576]  kasan_report (mm/kasan/report.c:597)
[  218.792949][  T576]  ? kobject_put (lib/kobject.c:733)
[  218.792955][  T576]  kobject_put (lib/kobject.c:733)
[  218.792958][  T576]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  218.792966][  T576]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  218.792970][  T576]  ? generic_xdp_install (net/core/dev.c:11630)
[  218.792973][  T576]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  218.792979][  T576]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  218.792984][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.792998][  T576]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  218.793003][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  218.793022][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.793027][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.793033][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.793036][  T576]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  218.793039][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  218.793044][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  218.793047][  T576]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  218.793051][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  218.793053][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.793060][  T576]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  218.793067][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  218.793070][  T576]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  218.793076][  T576]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  218.793079][  T576]  ? 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)
[  218.793083][  T576]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  218.793087][  T576]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  218.793091][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.793097][  T576]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  218.793101][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  218.793105][  T576]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  218.793117][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  218.793121][  T576]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  218.793131][  T576]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  218.793134][  T576]  ? __copy_msghdr (net/socket.c:2556)
[  218.793141][  T576]  ___sys_sendmsg (net/socket.c:2686)
[  218.793144][  T576]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  218.793147][  T576]  ? __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)
[  218.793158][  T576]  ? copy_msghdr_from_user (net/socket.c:2673)
[  218.793163][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.793167][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.793173][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.793176][  T576]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  218.793189][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  218.793195][  T576]  __sys_sendmsg (net/socket.c:2716)
[  218.793198][  T576]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  218.793202][  T576]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  218.793210][  T576]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  218.793214][  T576]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  218.793222][  T576]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  218.793230][  T576] RIP: 0033:0x7f7ec0e321d7
[  218.793237][  T576] 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)
[  218.793240][  T576] RSP: 002b:00007fff7be3a978 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  218.793245][  T576] RAX: ffffffffffffffda RBX: 00007fff7be3b0a0 RCX: 00007f7ec0e321d7
[  218.793248][  T576] RDX: 0000000000000000 RSI: 00007fff7be3a9e0 RDI: 0000000000000005
[  218.793250][  T576] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  218.793252][  T576] R10: 00007f7ec0d2ef60 R11: 0000000000000246 R12: 0000000000000002
[  218.793253][  T576] R13: 00000000690df32f R14: 0000000000499600 R15: 0000000000000000
| [  218.823428][  T576] refcount_t: underflow; use-after-free.
| [  218.823641][  T576] WARNING: CPU: 1 PID: 576 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  218.823975][  T576] Modules linked in: act_gact cls_flower sch_ingress 8021q ip_gre gre vrf veth
| [  218.824862][  T576] Tainted: [B]=BAD_PAGE
[  218.824999][  T576] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  218.825343][  T576] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  218.825582][  T576] 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 98 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 98 	mov    $0xffffffff98658d60,%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
[  218.826385][  T576] RSP: 0018:ffffc90000e671f0 EFLAGS: 00010286
[  218.826614][  T576] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  218.826883][  T576] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  218.827262][  T576] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff31fe134
[  218.827540][  T576] R10: 0000000000000003 R11: ffffc90000e66d80 R12: 0000000000000001
[  218.827903][  T576] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  218.828178][  T576] FS:  00007f7ec0c64800(0000) GS:ffff88809be72000(0000) knlGS:0000000000000000
[  218.828502][  T576] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  218.828829][  T576] CR2: 00007f6cad8e4000 CR3: 000000000bfd7002 CR4: 0000000000772ef0
[  218.829111][  T576] PKRU: 55555554
[  218.829253][  T576] Call Trace:
[  218.829391][  T576]  <TASK>
[  218.829578][  T576]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  218.829764][  T576]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  218.829960][  T576]  ? generic_xdp_install (net/core/dev.c:11630)
[  218.830131][  T576]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  218.830397][  T576]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  218.830594][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.830753][  T576]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  218.830912][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  218.831227][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.831387][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.831556][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.831712][  T576]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  218.831962][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  218.832128][  T576]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  218.832330][  T576]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  218.832584][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  218.832741][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.832902][  T576]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  218.833076][  T576]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  218.833243][  T576]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  218.833403][  T576]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  218.833559][  T576]  ? 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)
[  218.833718][  T576]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  218.833970][  T576]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  218.834137][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.834312][  T576]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  218.834473][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  218.834722][  T576]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  218.834887][  T576]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  218.835056][  T576]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  218.835225][  T576]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  218.835515][  T576]  ? __copy_msghdr (net/socket.c:2556)
[  218.835676][  T576]  ___sys_sendmsg (net/socket.c:2686)
[  218.835843][  T576]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  218.836001][  T576]  ? __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)
[  218.836335][  T576]  ? copy_msghdr_from_user (net/socket.c:2673)
[  218.836496][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.836655][  T576]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  218.836819][  T576]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  218.837080][  T576]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  218.837252][  T576]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  218.837411][  T576]  __sys_sendmsg (net/socket.c:2716)
[  218.837569][  T576]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  218.837860][  T576]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  218.838023][  T576]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  218.838188][  T576]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  218.838359][  T576]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  218.838646][  T576] RIP: 0033:0x7f7ec0e321d7
[  218.838821][  T576] 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)
[  218.839497][  T576] RSP: 002b:00007fff7be3a978 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  218.839740][  T576] RAX: ffffffffffffffda RBX: 00007fff7be3b0a0 RCX: 00007f7ec0e321d7
[  218.840087][  T576] RDX: 0000000000000000 RSI: 00007fff7be3a9e0 RDI: 0000000000000005
[  218.840332][  T576] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  218.840566][  T576] R10: 00007f7ec0d2ef60 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