======================================
| [  246.752181][  T575] ==================================================================
| [  246.752558][  T575] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  246.752864][  T575] Read of size 1 at addr ffff88800cb916ac by task ip/575
| [  246.753124][  T575]
[  246.753255][  T575] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  246.753257][  T575] Call Trace:
[  246.753261][  T575]  <TASK>
[  246.753263][  T575]  dump_stack_lvl (lib/dump_stack.c:123)
[  246.753271][  T575]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  246.753285][  T575]  ? kobject_put (lib/kobject.c:733)
[  246.753290][  T575]  print_report (mm/kasan/report.c:483)
[  246.753294][  T575]  ? kobject_put (lib/kobject.c:733)
[  246.753299][  T575]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  246.753303][  T575]  ? kobject_put (lib/kobject.c:733)
[  246.753307][  T575]  kasan_report (mm/kasan/report.c:597)
[  246.753316][  T575]  ? kobject_put (lib/kobject.c:733)
[  246.753324][  T575]  kobject_put (lib/kobject.c:733)
[  246.753328][  T575]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  246.753337][  T575]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  246.753340][  T575]  ? generic_xdp_install (net/core/dev.c:11630)
[  246.753346][  T575]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  246.753353][  T575]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  246.753357][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.753371][  T575]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  246.753381][  T575]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  246.753408][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.753413][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.753419][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.753423][  T575]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  246.753425][  T575]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  246.753430][  T575]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  246.753433][  T575]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  246.753437][  T575]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  246.753440][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.753447][  T575]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  246.753452][  T575]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  246.753455][  T575]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  246.753462][  T575]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  246.753465][  T575]  ? 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)
[  246.753469][  T575]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  246.753473][  T575]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  246.753477][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.753482][  T575]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  246.753487][  T575]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  246.753490][  T575]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  246.753498][  T575]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  246.753501][  T575]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  246.753511][  T575]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  246.753514][  T575]  ? __copy_msghdr (net/socket.c:2556)
[  246.753522][  T575]  ___sys_sendmsg (net/socket.c:2686)
[  246.753525][  T575]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  246.753529][  T575]  ? __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)
[  246.753539][  T575]  ? copy_msghdr_from_user (net/socket.c:2673)
[  246.753545][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.753549][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.753555][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.753558][  T575]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  246.753568][  T575]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  246.753574][  T575]  __sys_sendmsg (net/socket.c:2716)
[  246.753577][  T575]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  246.753581][  T575]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  246.753589][  T575]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  246.753593][  T575]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  246.753600][  T575]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  246.753607][  T575] RIP: 0033:0x7fabc95631d7
[  246.753612][  T575] 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)
[  246.753615][  T575] RSP: 002b:00007ffd886f1b48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  246.753619][  T575] RAX: ffffffffffffffda RBX: 00007ffd886f2270 RCX: 00007fabc95631d7
[  246.753621][  T575] RDX: 0000000000000000 RSI: 00007ffd886f1bb0 RDI: 0000000000000005
[  246.753623][  T575] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  246.753625][  T575] R10: 00007fabc945ff60 R11: 0000000000000246 R12: 0000000000000002
[  246.753626][  T575] R13: 00000000690de922 R14: 0000000000499600 R15: 0000000000000000
| [  246.783733][  T575] refcount_t: underflow; use-after-free.
| [  246.784119][  T575] WARNING: CPU: 0 PID: 575 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  246.784625][  T575] Modules linked in: act_gact cls_flower sch_ingress 8021q ip6_gre ip6_tunnel tunnel6 gre vrf veth
| [  246.785966][  T575] Tainted: [B]=BAD_PAGE
[  246.786275][  T575] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  246.786671][  T575] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  246.787056][  T575] 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 e5 95 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 e5 95 	mov    $0xffffffff95e58d60,%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
[  246.788201][  T575] RSP: 0000:ffffc90000eef1f0 EFLAGS: 00010286
[  246.788600][  T575] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  246.789051][  T575] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  246.789521][  T575] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2cfe134
[  246.789969][  T575] R10: 0000000000000003 R11: ffffc90000eeed80 R12: 0000000000000001
[  246.790550][  T575] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  246.791008][  T575] FS:  00007fabc9395800(0000) GS:ffff88809e5f2000(0000) knlGS:0000000000000000
[  246.791548][  T575] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  246.791910][  T575] CR2: 00007f24d3972b30 CR3: 000000000c25e002 CR4: 0000000000772ef0
[  246.792338][  T575] PKRU: 55555554
[  246.792558][  T575] Call Trace:
[  246.792771][  T575]  <TASK>
[  246.792916][  T575]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  246.793222][  T575]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  246.793509][  T575]  ? generic_xdp_install (net/core/dev.c:11630)
[  246.793794][  T575]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  246.794116][  T575]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  246.794474][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.794762][  T575]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  246.795056][  T575]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  246.795431][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.795702][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.795991][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.796291][  T575]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  246.796573][  T575]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  246.796852][  T575]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  246.797283][  T575]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  246.797560][  T575]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  246.797822][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.798123][  T575]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  246.798442][  T575]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  246.798724][  T575]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  246.798996][  T575]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  246.799276][  T575]  ? 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)
[  246.799565][  T575]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  246.799885][  T575]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  246.800218][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.800538][  T575]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  246.800838][  T575]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  246.801150][  T575]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  246.801449][  T575]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  246.801714][  T575]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  246.801977][  T575]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  246.802351][  T575]  ? __copy_msghdr (net/socket.c:2556)
[  246.802668][  T575]  ___sys_sendmsg (net/socket.c:2686)
[  246.802976][  T575]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  246.803262][  T575]  ? __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)
[  246.803642][  T575]  ? copy_msghdr_from_user (net/socket.c:2673)
[  246.803930][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.804243][  T575]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  246.804541][  T575]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  246.804786][  T575]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  246.805081][  T575]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  246.805355][  T575]  __sys_sendmsg (net/socket.c:2716)
[  246.805619][  T575]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  246.805964][  T575]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  246.806262][  T575]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  246.806542][  T575]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  246.806811][  T575]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  246.807168][  T575] RIP: 0033:0x7fabc95631d7
[  246.807480][  T575] 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)
[  246.808487][  T575] RSP: 002b:00007ffd886f1b48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  246.808908][  T575] RAX: ffffffffffffffda RBX: 00007ffd886f2270 RCX: 00007fabc95631d7
[  246.809339][  T575] RDX: 0000000000000000 RSI: 00007ffd886f1bb0 RDI: 0000000000000005
[  246.809781][  T575] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  246.810251][  T575] R10: 00007fabc945ff60 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