======================================
| [  130.554917][  T661] ==================================================================
| [  130.555485][  T661] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  130.555979][  T661] Read of size 1 at addr ffff8880074a96ac by task ip/661
| [  130.556306][  T661]
[  130.556431][  T661] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  130.556436][  T661] Call Trace:
[  130.556443][  T661]  <TASK>
[  130.556445][  T661]  dump_stack_lvl (lib/dump_stack.c:123)
[  130.556458][  T661]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  130.556475][  T661]  ? kobject_put (lib/kobject.c:733)
[  130.556480][  T661]  print_report (mm/kasan/report.c:483)
[  130.556483][  T661]  ? kobject_put (lib/kobject.c:733)
[  130.556486][  T661]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  130.556490][  T661]  ? kobject_put (lib/kobject.c:733)
[  130.556493][  T661]  kasan_report (mm/kasan/report.c:597)
[  130.556497][  T661]  ? kobject_put (lib/kobject.c:733)
[  130.556502][  T661]  kobject_put (lib/kobject.c:733)
[  130.556506][  T661]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  130.556514][  T661]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  130.556520][  T661]  ? generic_xdp_install (net/core/dev.c:11630)
[  130.556525][  T661]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  130.556532][  T661]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  130.556537][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.556551][  T661]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  130.556559][  T661]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  130.556578][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.556582][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.556588][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.556592][  T661]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  130.556595][  T661]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  130.556600][  T661]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  130.556603][  T661]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  130.556607][  T661]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  130.556610][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.556616][  T661]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  130.556624][  T661]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  130.556627][  T661]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  130.556634][  T661]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  130.556636][  T661]  ? 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)
[  130.556640][  T661]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  130.556644][  T661]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  130.556648][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.556654][  T661]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  130.556659][  T661]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  130.556662][  T661]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  130.556673][  T661]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  130.556676][  T661]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  130.556689][  T661]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  130.556692][  T661]  ? __copy_msghdr (net/socket.c:2556)
[  130.556701][  T661]  ___sys_sendmsg (net/socket.c:2686)
[  130.556705][  T661]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  130.556708][  T661]  ? __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)
[  130.556721][  T661]  ? copy_msghdr_from_user (net/socket.c:2673)
[  130.556726][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.556731][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.556736][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.556740][  T661]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  130.556752][  T661]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  130.556758][  T661]  __sys_sendmsg (net/socket.c:2716)
[  130.556761][  T661]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  130.556765][  T661]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  130.556773][  T661]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  130.556779][  T661]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  130.556789][  T661]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  130.556795][  T661] RIP: 0033:0x7f0bd2b1d1d7
[  130.556802][  T661] 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)
[  130.556805][  T661] RSP: 002b:00007ffdce414498 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  130.556812][  T661] RAX: ffffffffffffffda RBX: 00007ffdce414bc0 RCX: 00007f0bd2b1d1d7
[  130.556814][  T661] RDX: 0000000000000000 RSI: 00007ffdce414500 RDI: 0000000000000005
[  130.556816][  T661] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  130.556818][  T661] R10: 00007f0bd2a19f60 R11: 0000000000000246 R12: 0000000000000002
[  130.556820][  T661] R13: 00000000690deb0c R14: 0000000000499600 R15: 0000000000000000
| [  130.588613][  T661] refcount_t: underflow; use-after-free.
| [  130.588997][  T661] WARNING: CPU: 1 PID: 661 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  130.589385][  T661] Modules linked in: act_gact cls_flower sch_ingress ip_gre gre 8021q vrf veth
| [  130.590181][  T661] Tainted: [B]=BAD_PAGE
[  130.590346][  T661] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  130.590598][  T661] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  130.590885][  T661] 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 a5 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 a5 	mov    $0xffffffffa5e58d60,%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
[  130.591716][  T661] RSP: 0018:ffffc900010bf1f0 EFLAGS: 00010286
[  130.591979][  T661] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  130.592398][  T661] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  130.592708][  T661] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4cfe134
[  130.593002][  T661] R10: 0000000000000003 R11: ffffc900010bed80 R12: 0000000000000001
[  130.593403][  T661] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  130.593704][  T661] FS:  00007f0bd294f800(0000) GS:ffff88808e672000(0000) knlGS:0000000000000000
[  130.594184][  T661] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  130.594465][  T661] CR2: 00007fa1742a0000 CR3: 000000000ed5c006 CR4: 0000000000772ef0
[  130.594792][  T661] PKRU: 55555554
[  130.594941][  T661] Call Trace:
[  130.595218][  T661]  <TASK>
[  130.595333][  T661]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  130.595563][  T661]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  130.595766][  T661]  ? generic_xdp_install (net/core/dev.c:11630)
[  130.596073][  T661]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  130.596294][  T661]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  130.596552][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.596763][  T661]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  130.597066][  T661]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  130.597335][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.597544][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.597744][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.598055][  T661]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  130.598256][  T661]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  130.598461][  T661]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  130.598705][  T661]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  130.598929][  T661]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  130.599123][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.599335][  T661]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  130.599531][  T661]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  130.599852][  T661]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  130.600037][  T661]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  130.600257][  T661]  ? 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)
[  130.600452][  T661]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  130.600769][  T661]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  130.600962][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.601151][  T661]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  130.601353][  T661]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  130.601651][  T661]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  130.601854][  T661]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  130.602030][  T661]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  130.602227][  T661]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  130.602598][  T661]  ? __copy_msghdr (net/socket.c:2556)
[  130.602796][  T661]  ___sys_sendmsg (net/socket.c:2686)
[  130.602975][  T661]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  130.603266][  T661]  ? __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)
[  130.603526][  T661]  ? copy_msghdr_from_user (net/socket.c:2673)
[  130.603726][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.603936][  T661]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  130.604228][  T661]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  130.604435][  T661]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  130.604647][  T661]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  130.604854][  T661]  __sys_sendmsg (net/socket.c:2716)
[  130.605154][  T661]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  130.605413][  T661]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  130.605619][  T661]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  130.605818][  T661]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  130.606100][  T661]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  130.606350][  T661] RIP: 0033:0x7f0bd2b1d1d7
[  130.606560][  T661] 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)
[  130.607275][  T661] RSP: 002b:00007ffdce414498 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  130.607584][  T661] RAX: ffffffffffffffda RBX: 00007ffdce414bc0 RCX: 00007f0bd2b1d1d7
[  130.607988][  T661] RDX: 0000000000000000 RSI: 00007ffdce414500 RDI: 0000000000000005
[  130.608312][  T661] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  130.608761][  T661] R10: 00007f0bd2a19f60 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