======================================
| [  247.293092][  T574] ==================================================================
| [  247.293508][  T574] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  247.293795][  T574] Read of size 1 at addr ffff88800c4b46ac by task ip/574
| [  247.294017][  T574]
[  247.294127][  T574] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  247.294129][  T574] Call Trace:
[  247.294133][  T574]  <TASK>
[  247.294135][  T574]  dump_stack_lvl (lib/dump_stack.c:123)
[  247.294140][  T574]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  247.294150][  T574]  ? kobject_put (lib/kobject.c:733)
[  247.294154][  T574]  print_report (mm/kasan/report.c:483)
[  247.294157][  T574]  ? kobject_put (lib/kobject.c:733)
[  247.294160][  T574]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  247.294163][  T574]  ? kobject_put (lib/kobject.c:733)
[  247.294166][  T574]  kasan_report (mm/kasan/report.c:597)
[  247.294170][  T574]  ? kobject_put (lib/kobject.c:733)
[  247.294175][  T574]  kobject_put (lib/kobject.c:733)
[  247.294179][  T574]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  247.294187][  T574]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  247.294190][  T574]  ? generic_xdp_install (net/core/dev.c:11630)
[  247.294195][  T574]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  247.294202][  T574]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  247.294206][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.294218][  T574]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  247.294223][  T574]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  247.294242][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.294247][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.294253][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.294256][  T574]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  247.294259][  T574]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  247.294263][  T574]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  247.294267][  T574]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  247.294270][  T574]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  247.294273][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.294280][  T574]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  247.294287][  T574]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  247.294291][  T574]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  247.294300][  T574]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  247.294303][  T574]  ? 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)
[  247.294307][  T574]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  247.294311][  T574]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  247.294315][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.294320][  T574]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  247.294325][  T574]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  247.294328][  T574]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  247.294338][  T574]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  247.294342][  T574]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  247.294350][  T574]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  247.294353][  T574]  ? __copy_msghdr (net/socket.c:2556)
[  247.294360][  T574]  ___sys_sendmsg (net/socket.c:2686)
[  247.294363][  T574]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  247.294366][  T574]  ? __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)
[  247.294375][  T574]  ? copy_msghdr_from_user (net/socket.c:2673)
[  247.294380][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.294385][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.294390][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.294394][  T574]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  247.294401][  T574]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  247.294407][  T574]  __sys_sendmsg (net/socket.c:2716)
[  247.294410][  T574]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  247.294414][  T574]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  247.294422][  T574]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  247.294426][  T574]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  247.294433][  T574]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  247.294438][  T574] RIP: 0033:0x7f172a8ee1d7
[  247.294443][  T574] 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)
[  247.294446][  T574] RSP: 002b:00007fff6431b958 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  247.294452][  T574] RAX: ffffffffffffffda RBX: 00007fff6431c080 RCX: 00007f172a8ee1d7
[  247.294455][  T574] RDX: 0000000000000000 RSI: 00007fff6431b9c0 RDI: 0000000000000005
[  247.294456][  T574] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  247.294458][  T574] R10: 00007f172a7eaf60 R11: 0000000000000246 R12: 0000000000000002
[  247.294460][  T574] R13: 00000000690de963 R14: 0000000000499600 R15: 0000000000000000
| [  247.325390][  T574] refcount_t: underflow; use-after-free.
| [  247.325636][  T574] WARNING: CPU: 0 PID: 574 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  247.325954][  T574] Modules linked in: act_gact cls_flower sch_ingress 8021q ip_gre gre vrf veth
| [  247.326774][  T574] Tainted: [B]=BAD_PAGE
[  247.326923][  T574] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  247.327132][  T574] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  247.327368][  T574] 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 8c 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 8c 	mov    $0xffffffff8c658d60,%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
[  247.328078][  T574] RSP: 0018:ffffc900006e71f0 EFLAGS: 00010286
[  247.328309][  T574] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  247.328652][  T574] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  247.328933][  T574] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff19fe134
[  247.329197][  T574] R10: 0000000000000003 R11: ffffc900006e6d80 R12: 0000000000000001
[  247.329564][  T574] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  247.329844][  T574] FS:  00007f172a720800(0000) GS:ffff8880a7df2000(0000) knlGS:0000000000000000
[  247.330143][  T574] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  247.330371][  T574] CR2: 00000000004e7458 CR3: 0000000008b1a001 CR4: 0000000000772ef0
[  247.330661][  T574] PKRU: 55555554
[  247.330900][  T574] Call Trace:
[  247.331122][  T574]  <TASK>
[  247.331213][  T574]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  247.331393][  T574]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  247.331573][  T574]  ? generic_xdp_install (net/core/dev.c:11630)
[  247.331859][  T574]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  247.332025][  T574]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  247.332249][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.332431][  T574]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  247.332596][  T574]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  247.332821][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.332992][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.333185][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.333360][  T574]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  247.333628][  T574]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  247.333837][  T574]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  247.334048][  T574]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  247.334321][  T574]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  247.334501][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.334677][  T574]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  247.334847][  T574]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  247.335022][  T574]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  247.335194][  T574]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  247.335370][  T574]  ? 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)
[  247.335545][  T574]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  247.335738][  T574]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  247.335905][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.336077][  T574]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  247.336243][  T574]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  247.336418][  T574]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  247.336681][  T574]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  247.336850][  T574]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  247.337033][  T574]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  247.337237][  T574]  ? __copy_msghdr (net/socket.c:2556)
[  247.337414][  T574]  ___sys_sendmsg (net/socket.c:2686)
[  247.337582][  T574]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  247.337748][  T574]  ? __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)
[  247.338058][  T574]  ? copy_msghdr_from_user (net/socket.c:2673)
[  247.338225][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.338402][  T574]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  247.338762][  T574]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  247.338928][  T574]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  247.339115][  T574]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  247.339300][  T574]  __sys_sendmsg (net/socket.c:2716)
[  247.339570][  T574]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  247.339787][  T574]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  247.339953][  T574]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  247.340122][  T574]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  247.340391][  T574]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  247.340599][  T574] RIP: 0033:0x7f172a8ee1d7
[  247.340794][  T574] 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)
[  247.341500][  T574] RSP: 002b:00007fff6431b958 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  247.341771][  T574] RAX: ffffffffffffffda RBX: 00007fff6431c080 RCX: 00007f172a8ee1d7
[  247.342153][  T574] RDX: 0000000000000000 RSI: 00007fff6431b9c0 RDI: 0000000000000005
[  247.342418][  T574] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  247.342768][  T574] R10: 00007f172a7eaf60 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