======================================
| [   46.987452][  T439] ==================================================================
| [   46.987889][  T439] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   46.988266][  T439] Read of size 1 at addr ffff88800be116ac by task ip/439
| [   46.988544][  T439]
[   46.988649][  T439] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   46.988653][  T439] Call Trace:
[   46.988655][  T439]  <TASK>
[   46.988657][  T439]  dump_stack_lvl (lib/dump_stack.c:123)
[   46.988665][  T439]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   46.988679][  T439]  ? kobject_put (lib/kobject.c:733)
[   46.988684][  T439]  print_report (mm/kasan/report.c:483)
[   46.988686][  T439]  ? kobject_put (lib/kobject.c:733)
[   46.988690][  T439]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   46.988693][  T439]  ? kobject_put (lib/kobject.c:733)
[   46.988696][  T439]  kasan_report (mm/kasan/report.c:597)
[   46.988699][  T439]  ? kobject_put (lib/kobject.c:733)
[   46.988705][  T439]  kobject_put (lib/kobject.c:733)
[   46.988708][  T439]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   46.988717][  T439]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   46.988720][  T439]  ? generic_xdp_install (net/core/dev.c:11630)
[   46.988723][  T439]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   46.988726][  T439]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   46.988734][  T439]  ? net_generic (./include/net/netns/generic.h:51)
[   46.988739][  T439]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   46.988746][  T439]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   46.988778][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   46.988798][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   46.988810][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   46.988815][  T439]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   46.988819][  T439]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   46.988827][  T439]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   46.988833][  T439]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   46.988839][  T439]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   46.988844][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   46.988857][  T439]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   46.988866][  T439]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   46.988872][  T439]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   46.988885][  T439]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   46.988889][  T439]  ? 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)
[   46.988894][  T439]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   46.988900][  T439]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   46.988906][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   46.988915][  T439]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   46.988922][  T439]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   46.988927][  T439]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   46.988946][  T439]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   46.988952][  T439]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   46.988970][  T439]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   46.988975][  T439]  ? __copy_msghdr (net/socket.c:2556)
[   46.988991][  T439]  ___sys_sendmsg (net/socket.c:2686)
[   46.988996][  T439]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   46.989000][  T439]  ? __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)
[   46.989016][  T439]  ? copy_msghdr_from_user (net/socket.c:2673)
[   46.989021][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   46.989025][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   46.989031][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   46.989035][  T439]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   46.989048][  T439]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   46.989055][  T439]  __sys_sendmsg (net/socket.c:2716)
[   46.989058][  T439]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   46.989062][  T439]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   46.989070][  T439]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   46.989074][  T439]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   46.989081][  T439]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   46.989089][  T439] RIP: 0033:0x7fa2c0eed1d7
[   46.989101][  T439] 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)
[   46.989104][  T439] RSP: 002b:00007ffc1f2a5868 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   46.989110][  T439] RAX: ffffffffffffffda RBX: 00007ffc1f2a5f90 RCX: 00007fa2c0eed1d7
[   46.989112][  T439] RDX: 0000000000000000 RSI: 00007ffc1f2a58d0 RDI: 0000000000000005
[   46.989114][  T439] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   46.989116][  T439] R10: 00007fa2c0de9f60 R11: 0000000000000246 R12: 0000000000000002
[   46.989117][  T439] R13: 00000000690dee9b R14: 0000000000499600 R15: 0000000000000000
| [   47.020637][  T439] refcount_t: underflow; use-after-free.
| [   47.020902][  T439] WARNING: CPU: 2 PID: 439 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   47.021269][  T439] Modules linked in: ip_gre gre 8021q dummy vrf veth
| [   47.022035][  T439] Tainted: [B]=BAD_PAGE
[   47.022238][  T439] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   47.022499][  T439] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   47.022839][  T439] 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 85 bc 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 85 bc 	mov    $0xffffffffbc858d60,%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
[   47.023565][  T439] RSP: 0018:ffffc90000b771f0 EFLAGS: 00010286
[   47.023841][  T439] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   47.024176][  T439] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   47.024468][  T439] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7a3e134
[   47.024822][  T439] R10: 0000000000000003 R11: ffffc90000b76d80 R12: 0000000000000001
[   47.025173][  T439] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   47.025455][  T439] FS:  00007fa2c0d1f800(0000) GS:ffff888077cf2000(0000) knlGS:0000000000000000
[   47.025813][  T439] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.026080][  T439] CR2: 00000000004061e9 CR3: 000000000bdd2003 CR4: 0000000000772ef0
[   47.026388][  T439] PKRU: 55555554
[   47.026554][  T439] Call Trace:
[   47.026766][  T439]  <TASK>
[   47.026896][  T439]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   47.027127][  T439]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   47.027454][  T439]  ? generic_xdp_install (net/core/dev.c:11630)
[   47.027707][  T439]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   47.027909][  T439]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   47.028124][  T439]  ? net_generic (./include/net/netns/generic.h:51)
[   47.028424][  T439]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   47.028646][  T439]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   47.028916][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   47.029132][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   47.029442][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   47.029746][  T439]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   47.029946][  T439]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   47.030153][  T439]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   47.030480][  T439]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   47.030737][  T439]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   47.030963][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   47.031231][  T439]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   47.031446][  T439]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   47.031673][  T439]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   47.031883][  T439]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   47.032126][  T439]  ? 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)
[   47.032373][  T439]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   47.032585][  T439]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   47.032813][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   47.033054][  T439]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   47.033254][  T439]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   47.033463][  T439]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   47.033700][  T439]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   47.033899][  T439]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   47.034165][  T439]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   47.034404][  T439]  ? __copy_msghdr (net/socket.c:2556)
[   47.034640][  T439]  ___sys_sendmsg (net/socket.c:2686)
[   47.034842][  T439]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   47.035059][  T439]  ? __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)
[   47.035321][  T439]  ? copy_msghdr_from_user (net/socket.c:2673)
[   47.035510][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   47.035764][  T439]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   47.035990][  T439]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   47.036218][  T439]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   47.036428][  T439]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   47.036635][  T439]  __sys_sendmsg (net/socket.c:2716)
[   47.036837][  T439]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   47.037107][  T439]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   47.037313][  T439]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   47.037525][  T439]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   47.037769][  T439]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   47.038031][  T439] RIP: 0033:0x7fa2c0eed1d7
[   47.038268][  T439] 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)
[   47.038976][  T439] RSP: 002b:00007ffc1f2a5868 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   47.039283][  T439] RAX: ffffffffffffffda RBX: 00007ffc1f2a5f90 RCX: 00007fa2c0eed1d7
[   47.039609][  T439] RDX: 0000000000000000 RSI: 00007ffc1f2a58d0 RDI: 0000000000000005
[   47.039918][  T439] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   47.040206][  T439] R10: 00007fa2c0de9f60 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