======================================
| [  127.969134][  T762] ==================================================================
| [  127.969430][  T762] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  127.969703][  T762] Read of size 1 at addr ffff8880077b96ac by task ip/762
| [  127.969906][  T762]
[  127.970004][  T762] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  127.970006][  T762] Call Trace:
[  127.970009][  T762]  <TASK>
[  127.970011][  T762]  dump_stack_lvl (lib/dump_stack.c:123)
[  127.970018][  T762]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  127.970026][  T762]  ? kobject_put (lib/kobject.c:733)
[  127.970030][  T762]  print_report (mm/kasan/report.c:483)
[  127.970033][  T762]  ? kobject_put (lib/kobject.c:733)
[  127.970036][  T762]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  127.970039][  T762]  ? kobject_put (lib/kobject.c:733)
[  127.970043][  T762]  kasan_report (mm/kasan/report.c:597)
[  127.970046][  T762]  ? kobject_put (lib/kobject.c:733)
[  127.970051][  T762]  kobject_put (lib/kobject.c:733)
[  127.970055][  T762]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  127.970060][  T762]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  127.970063][  T762]  ? generic_xdp_install (net/core/dev.c:11630)
[  127.970066][  T762]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  127.970068][  T762]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[  127.970075][  T762]  ? net_generic (./include/net/netns/generic.h:51)
[  127.970080][  T762]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  127.970085][  T762]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  127.970103][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  127.970109][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  127.970116][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  127.970119][  T762]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  127.970122][  T762]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  127.970128][  T762]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  127.970131][  T762]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  127.970135][  T762]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  127.970138][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  127.970144][  T762]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  127.970149][  T762]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  127.970152][  T762]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  127.970159][  T762]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  127.970161][  T762]  ? 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)
[  127.970165][  T762]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  127.970169][  T762]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  127.970173][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  127.970179][  T762]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  127.970183][  T762]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  127.970187][  T762]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  127.970192][  T762]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  127.970196][  T762]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  127.970201][  T762]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  127.970204][  T762]  ? __copy_msghdr (net/socket.c:2556)
[  127.970212][  T762]  ___sys_sendmsg (net/socket.c:2686)
[  127.970215][  T762]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  127.970218][  T762]  ? __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)
[  127.970223][  T762]  ? copy_msghdr_from_user (net/socket.c:2673)
[  127.970228][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  127.970232][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  127.970238][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  127.970241][  T762]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  127.970249][  T762]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  127.970255][  T762]  __sys_sendmsg (net/socket.c:2716)
[  127.970259][  T762]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  127.970263][  T762]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  127.970270][  T762]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  127.970274][  T762]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  127.970279][  T762]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  127.970287][  T762] RIP: 0033:0x7efcc38ab1d7
[  127.970292][  T762] 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)
[  127.970295][  T762] RSP: 002b:00007ffc2afeeaf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  127.970299][  T762] RAX: ffffffffffffffda RBX: 00007ffc2afef220 RCX: 00007efcc38ab1d7
[  127.970301][  T762] RDX: 0000000000000000 RSI: 00007ffc2afeeb60 RDI: 0000000000000005
[  127.970303][  T762] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  127.970304][  T762] R10: 00007efcc37a7f60 R11: 0000000000000246 R12: 0000000000000002
[  127.970306][  T762] R13: 00000000690df444 R14: 0000000000499600 R15: 0000000000000000
| [  127.996748][  T762] refcount_t: underflow; use-after-free.
| [  127.997156][  T762] WARNING: CPU: 2 PID: 762 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  127.997666][  T762] Modules linked in: act_mirred cls_flower bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth
| [  127.999091][  T762] Tainted: [B]=BAD_PAGE
[  127.999348][  T762] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  127.999733][  T762] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  128.000157][  T762] 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 a3 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 a3 	mov    $0xffffffffa3c58d60,%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
[  128.001176][  T762] RSP: 0018:ffffc9000159f1f0 EFLAGS: 00010286
[  128.001548][  T762] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  128.001990][  T762] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  128.002428][  T762] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff48be134
[  128.002864][  T762] R10: 0000000000000003 R11: ffffc9000159ed80 R12: 0000000000000001
[  128.003314][  T762] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  128.003751][  T762] FS:  00007efcc36dd800(0000) GS:ffff8880908f2000(0000) knlGS:0000000000000000
[  128.004260][  T762] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  128.004636][  T762] CR2: 0000561b25219dec CR3: 000000000f2dd005 CR4: 0000000000772ef0
[  128.005078][  T762] PKRU: 55555554
[  128.005308][  T762] Call Trace:
[  128.005544][  T762]  <TASK>
[  128.005712][  T762]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  128.006031][  T762]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  128.006347][  T762]  ? generic_xdp_install (net/core/dev.c:11630)
[  128.006640][  T762]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  128.006933][  T762]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[  128.007365][  T762]  ? net_generic (./include/net/netns/generic.h:51)
[  128.007886][  T762]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  128.008212][  T762]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  128.008599][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  128.008904][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  128.009217][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  128.009712][  T762]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  128.010022][  T762]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  128.010321][  T762]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  128.010677][  T762]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  128.011170][  T762]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  128.011477][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  128.011779][  T762]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  128.012092][  T762]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  128.012567][  T762]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  128.012868][  T762]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  128.013175][  T762]  ? 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)
[  128.013478][  T762]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  128.013951][  T762]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  128.014261][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  128.014565][  T762]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  128.014862][  T762]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  128.015166][  T762]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  128.015467][  T762]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  128.015761][  T762]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  128.016071][  T762]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  128.016441][  T762]  ? __copy_msghdr (net/socket.c:2556)
[  128.016751][  T762]  ___sys_sendmsg (net/socket.c:2686)
[  128.017060][  T762]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  128.017359][  T762]  ? __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)
[  128.017899][  T762]  ? copy_msghdr_from_user (net/socket.c:2673)
[  128.018222][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  128.018521][  T762]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  128.019014][  T762]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  128.019313][  T762]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  128.019607][  T762]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  128.019903][  T762]  __sys_sendmsg (net/socket.c:2716)
[  128.020386][  T762]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  128.020759][  T762]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  128.021073][  T762]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  128.021370][  T762]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  128.021848][  T762]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  128.022218][  T762] RIP: 0033:0x7efcc38ab1d7
[  128.022535][  T762] 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)
[  128.023890][  T762] RSP: 002b:00007ffc2afeeaf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  128.024342][  T762] RAX: ffffffffffffffda RBX: 00007ffc2afef220 RCX: 00007efcc38ab1d7
[  128.024959][  T762] RDX: 0000000000000000 RSI: 00007ffc2afeeb60 RDI: 0000000000000005
[  128.025394][  T762] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  128.026015][  T762] R10: 00007efcc37a7f60 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