======================================
| [   73.041215][  T534] ==================================================================
| [   73.041531][  T534] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   73.041825][  T534] Read of size 1 at addr ffff8880025a46ac by task ip/534
| [   73.042045][  T534]
[   73.042162][  T534] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   73.042170][  T534] Call Trace:
[   73.042174][  T534]  <TASK>
[   73.042176][  T534]  dump_stack_lvl (lib/dump_stack.c:123)
[   73.042184][  T534]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   73.042203][  T534]  ? kobject_put (lib/kobject.c:733)
[   73.042207][  T534]  print_report (mm/kasan/report.c:483)
[   73.042210][  T534]  ? kobject_put (lib/kobject.c:733)
[   73.042213][  T534]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   73.042217][  T534]  ? kobject_put (lib/kobject.c:733)
[   73.042220][  T534]  kasan_report (mm/kasan/report.c:597)
[   73.042224][  T534]  ? kobject_put (lib/kobject.c:733)
[   73.042229][  T534]  kobject_put (lib/kobject.c:733)
[   73.042233][  T534]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   73.042240][  T534]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   73.042243][  T534]  ? generic_xdp_install (net/core/dev.c:11630)
[   73.042247][  T534]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   73.042255][  T534]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   73.042262][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.042274][  T534]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   73.042280][  T534]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.042299][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.042303][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.042309][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.042313][  T534]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   73.042316][  T534]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.042320][  T534]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.042324][  T534]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   73.042327][  T534]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.042330][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.042337][  T534]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   73.042344][  T534]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.042347][  T534]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   73.042354][  T534]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   73.042356][  T534]  ? 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)
[   73.042360][  T534]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   73.042364][  T534]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   73.042369][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.042375][  T534]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   73.042379][  T534]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.042383][  T534]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   73.042398][  T534]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.042402][  T534]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   73.042407][  T534]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   73.042410][  T534]  ? __copy_msghdr (net/socket.c:2556)
[   73.042417][  T534]  ___sys_sendmsg (net/socket.c:2686)
[   73.042420][  T534]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   73.042423][  T534]  ? __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)
[   73.042436][  T534]  ? copy_msghdr_from_user (net/socket.c:2673)
[   73.042441][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.042445][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.042451][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.042454][  T534]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   73.042465][  T534]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.042472][  T534]  __sys_sendmsg (net/socket.c:2716)
[   73.042475][  T534]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   73.042479][  T534]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   73.042486][  T534]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   73.042490][  T534]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   73.042497][  T534]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   73.042503][  T534] RIP: 0033:0x7f142876f1d7
[   73.042508][  T534] 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)
[   73.042511][  T534] RSP: 002b:00007ffff5553ab8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   73.042517][  T534] RAX: ffffffffffffffda RBX: 00007ffff55541e0 RCX: 00007f142876f1d7
[   73.042519][  T534] RDX: 0000000000000000 RSI: 00007ffff5553b20 RDI: 0000000000000005
[   73.042521][  T534] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   73.042523][  T534] R10: 00007f142866bf60 R11: 0000000000000246 R12: 0000000000000002
[   73.042525][  T534] R13: 00000000690df70e R14: 0000000000499600 R15: 0000000000000000
| [   73.074447][  T534] refcount_t: underflow; use-after-free.
| [   73.074653][  T534] WARNING: CPU: 1 PID: 534 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   73.074957][  T534] Modules linked in: act_gact cls_flower sch_ingress ip_gre gre 8021q vrf veth
| [   73.075684][  T534] Tainted: [B]=BAD_PAGE
[   73.075818][  T534] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   73.076037][  T534] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   73.076387][  T534] 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 45 a9 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 45 a9 	mov    $0xffffffffa9458d60,%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
[   73.077142][  T534] RSP: 0018:ffffc90000dcf1f0 EFLAGS: 00010286
[   73.078014][  T534] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   73.078300][  T534] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   73.078641][  T534] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff53be134
[   73.078907][  T534] R10: 0000000000000003 R11: ffffc90000dced80 R12: 0000000000000001
[   73.079182][  T534] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   73.079517][  T534] FS:  00007f14285a1800(0000) GS:ffff88808b072000(0000) knlGS:0000000000000000
[   73.079824][  T534] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   73.080054][  T534] CR2: 00000000004e7438 CR3: 000000000a6e5001 CR4: 0000000000772ef0
[   73.080334][  T534] PKRU: 55555554
[   73.080537][  T534] Call Trace:
[   73.080672][  T534]  <TASK>
[   73.080761][  T534]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   73.080938][  T534]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   73.081131][  T534]  ? generic_xdp_install (net/core/dev.c:11630)
[   73.081312][  T534]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   73.081564][  T534]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   73.081782][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.081960][  T534]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   73.082146][  T534]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.082446][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.082774][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.082951][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.083148][  T534]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   73.083321][  T534]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.083568][  T534]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   73.083785][  T534]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   73.083956][  T534]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.084145][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.084320][  T534]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   73.084566][  T534]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   73.084750][  T534]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   73.084926][  T534]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   73.085106][  T534]  ? 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)
[   73.085290][  T534]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   73.085537][  T534]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   73.085714][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.085888][  T534]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   73.086071][  T534]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.086265][  T534]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   73.086512][  T534]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   73.086690][  T534]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   73.086861][  T534]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   73.087075][  T534]  ? __copy_msghdr (net/socket.c:2556)
[   73.087276][  T534]  ___sys_sendmsg (net/socket.c:2686)
[   73.087521][  T534]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   73.087712][  T534]  ? __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)
[   73.087927][  T534]  ? copy_msghdr_from_user (net/socket.c:2673)
[   73.088111][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.088296][  T534]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   73.088541][  T534]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   73.088717][  T534]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   73.088889][  T534]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   73.089074][  T534]  __sys_sendmsg (net/socket.c:2716)
[   73.089266][  T534]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   73.089647][  T534]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   73.089822][  T534]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   73.089993][  T534]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   73.090182][  T534]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   73.090465][  T534] RIP: 0033:0x7f142876f1d7
[   73.090651][  T534] 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)
[   73.091461][  T534] RSP: 002b:00007ffff5553ab8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   73.091733][  T534] RAX: ffffffffffffffda RBX: 00007ffff55541e0 RCX: 00007f142876f1d7
[   73.092001][  T534] RDX: 0000000000000000 RSI: 00007ffff5553b20 RDI: 0000000000000005
[   73.092271][  T534] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   73.092703][  T534] R10: 00007f142866bf60 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