======================================
| xx__-> [   60.278089][  T486] ==================================================================
| [   60.278526][  T486] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   60.278863][  T486] Read of size 1 at addr ffff8880074e46ac by task ip/486
| [   60.279107][  T486]
[   60.279213][  T486] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   60.279217][  T486] Call Trace:
[   60.279222][  T486]  <TASK>
[   60.279225][  T486]  dump_stack_lvl (lib/dump_stack.c:123)
[   60.279233][  T486]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   60.279244][  T486]  ? kobject_put (lib/kobject.c:733)
[   60.279250][  T486]  print_report (mm/kasan/report.c:483)
[   60.279254][  T486]  ? kobject_put (lib/kobject.c:733)
[   60.279260][  T486]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   60.279264][  T486]  ? kobject_put (lib/kobject.c:733)
[   60.279268][  T486]  kasan_report (mm/kasan/report.c:597)
[   60.279274][  T486]  ? kobject_put (lib/kobject.c:733)
[   60.279279][  T486]  kobject_put (lib/kobject.c:733)
[   60.279283][  T486]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   60.279292][  T486]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   60.279295][  T486]  ? generic_xdp_install (net/core/dev.c:11630)
[   60.279299][  T486]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   60.279307][  T486]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   60.279311][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.279322][  T486]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   60.279327][  T486]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.279347][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.279351][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.279357][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.279361][  T486]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   60.279364][  T486]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.279368][  T486]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.279372][  T486]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   60.279375][  T486]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.279378][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.279385][  T486]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   60.279391][  T486]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.279394][  T486]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   60.279401][  T486]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   60.279404][  T486]  ? 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)
[   60.279407][  T486]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   60.279411][  T486]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   60.279415][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.279421][  T486]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   60.279425][  T486]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.279429][  T486]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   60.279438][  T486]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.279442][  T486]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   60.279453][  T486]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   60.279457][  T486]  ? __copy_msghdr (net/socket.c:2556)
[   60.279471][  T486]  ___sys_sendmsg (net/socket.c:2686)
[   60.279476][  T486]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   60.279480][  T486]  ? __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)
[   60.279494][  T486]  ? copy_msghdr_from_user (net/socket.c:2673)
[   60.279502][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.279508][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.279518][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.279523][  T486]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   60.279530][  T486]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.279539][  T486]  __sys_sendmsg (net/socket.c:2716)
[   60.279542][  T486]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   60.279546][  T486]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   60.279554][  T486]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.279558][  T486]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   60.279564][  T486]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   60.279573][  T486] RIP: 0033:0x7fd1d0fdd1d7
[   60.279577][  T486] 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)
[   60.279581][  T486] RSP: 002b:00007ffdee48d428 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   60.279590][  T486] RAX: ffffffffffffffda RBX: 00007ffdee48db50 RCX: 00007fd1d0fdd1d7
[   60.279593][  T486] RDX: 0000000000000000 RSI: 00007ffdee48d490 RDI: 0000000000000005
[   60.279596][  T486] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   60.279598][  T486] R10: 00007fd1d0ed9f60 R11: 0000000000000246 R12: 0000000000000002
[   60.279601][  T486] R13: 00000000690dee0f R14: 0000000000499600 R15: 0000000000000000
| [   60.321924][  T486] refcount_t: underflow; use-after-free.
| [   60.322241][  T486] WARNING: CPU: 3 PID: 486 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   60.322750][  T486] Modules linked in: vrf veth
| [   60.323631][  T486] Tainted: [B]=BAD_PAGE
[   60.323856][  T486] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   60.324198][  T486] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   60.324579][  T486] 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 c5 85 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 c5 85 	mov    $0xffffffff85c58d60,%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
[   60.325810][  T486] RSP: 0018:ffffc90000cc71f0 EFLAGS: 00010286
[   60.326164][  T486] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   60.326816][  T486] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   60.327451][  T486] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0cbe134
[   60.327894][  T486] R10: 0000000000000003 R11: ffffc90000cc6d80 R12: 0000000000000001
[   60.328352][  T486] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   60.328828][  T486] FS:  00007fd1d0e0f800(0000) GS:ffff8880ae972000(0000) knlGS:0000000000000000
[   60.329437][  T486] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.329811][  T486] CR2: 000055c7277addec CR3: 0000000008c52006 CR4: 0000000000772ef0
[   60.330362][  T486] PKRU: 55555554
[   60.330617][  T486] Call Trace:
[   60.330829][  T486]  <TASK>
[   60.330988][  T486]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   60.331304][  T486]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   60.331633][  T486]  ? generic_xdp_install (net/core/dev.c:11630)
[   60.331934][  T486]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   60.332222][  T486]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   60.332574][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.332857][  T486]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   60.333192][  T486]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.333579][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.333874][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.334337][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.334631][  T486]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   60.334909][  T486]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.335183][  T486]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.335748][  T486]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   60.336040][  T486]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.336356][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.336664][  T486]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   60.336951][  T486]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.337238][  T486]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   60.337537][  T486]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   60.337981][  T486]  ? 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)
[   60.338280][  T486]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   60.338577][  T486]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   60.338864][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.339306][  T486]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   60.339612][  T486]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.339891][  T486]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   60.340178][  T486]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.340671][  T486]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   60.340993][  T486]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   60.341351][  T486]  ? __copy_msghdr (net/socket.c:2556)
[   60.341661][  T486]  ___sys_sendmsg (net/socket.c:2686)
[   60.342127][  T486]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   60.342420][  T486]  ? __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)
[   60.342796][  T486]  ? copy_msghdr_from_user (net/socket.c:2673)
[   60.343100][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.343586][  T486]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.343880][  T486]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.344175][  T486]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   60.344464][  T486]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.344765][  T486]  __sys_sendmsg (net/socket.c:2716)
[   60.345057][  T486]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   60.345630][  T486]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   60.345943][  T486]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.346229][  T486]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   60.346516][  T486]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   60.346886][  T486] RIP: 0033:0x7fd1d0fdd1d7
[   60.347206][  T486] 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)
[   60.348260][  T486] RSP: 002b:00007ffdee48d428 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   60.348915][  T486] RAX: ffffffffffffffda RBX: 00007ffdee48db50 RCX: 00007fd1d0fdd1d7
[   60.349401][  T486] RDX: 0000000000000000 RSI: 00007ffdee48d490 RDI: 0000000000000005
[   60.350054][  T486] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   60.350512][  T486] R10: 00007fd1d0ed9f60 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