======================================
| [   74.195691][  T585] ==================================================================
| [   74.195993][  T585] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   74.196291][  T585] Read of size 1 at addr ffff888004f9a6ac by task ip/585
| [   74.196503][  T585]
[   74.196602][  T585] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   74.196606][  T585] Call Trace:
[   74.196609][  T585]  <TASK>
[   74.196611][  T585]  dump_stack_lvl (lib/dump_stack.c:123)
[   74.196620][  T585]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   74.196632][  T585]  ? kobject_put (lib/kobject.c:733)
[   74.196636][  T585]  print_report (mm/kasan/report.c:483)
[   74.196639][  T585]  ? kobject_put (lib/kobject.c:733)
[   74.196642][  T585]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   74.196646][  T585]  ? kobject_put (lib/kobject.c:733)
[   74.196649][  T585]  kasan_report (mm/kasan/report.c:597)
[   74.196653][  T585]  ? kobject_put (lib/kobject.c:733)
[   74.196658][  T585]  kobject_put (lib/kobject.c:733)
[   74.196661][  T585]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   74.196669][  T585]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   74.196672][  T585]  ? generic_xdp_install (net/core/dev.c:11630)
[   74.196674][  T585]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   74.196684][  T585]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   74.196689][  T585]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   74.196728][  T585]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   74.196734][  T585]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.196752][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.196762][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.196768][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.196772][  T585]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   74.196774][  T585]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.196779][  T585]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.196782][  T585]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   74.196785][  T585]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.196788][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.196795][  T585]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   74.196801][  T585]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.196804][  T585]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   74.196810][  T585]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   74.196813][  T585]  ? 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)
[   74.196817][  T585]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   74.196821][  T585]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   74.196825][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.196830][  T585]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   74.196834][  T585]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.196838][  T585]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   74.196843][  T585]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.196847][  T585]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   74.196853][  T585]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   74.196858][  T585]  ? __copy_msghdr (net/socket.c:2556)
[   74.196871][  T585]  ___sys_sendmsg (net/socket.c:2686)
[   74.196875][  T585]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   74.196880][  T585]  ? __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)
[   74.196892][  T585]  ? copy_msghdr_from_user (net/socket.c:2673)
[   74.196897][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.196902][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.196908][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.196911][  T585]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   74.196921][  T585]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.196928][  T585]  __sys_sendmsg (net/socket.c:2716)
[   74.196931][  T585]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   74.196935][  T585]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   74.196942][  T585]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   74.196947][  T585]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   74.196954][  T585]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   74.196959][  T585] RIP: 0033:0x7f2a5441a1d7
[   74.196965][  T585] 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)
[   74.196968][  T585] RSP: 002b:00007fff839062a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   74.196973][  T585] RAX: ffffffffffffffda RBX: 00007fff839069d0 RCX: 00007f2a5441a1d7
[   74.196975][  T585] RDX: 0000000000000000 RSI: 00007fff83906310 RDI: 0000000000000005
[   74.196977][  T585] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   74.196979][  T585] R10: 00007f2a54316f60 R11: 0000000000000246 R12: 0000000000000002
[   74.196981][  T585] R13: 00000000690df757 R14: 0000000000499600 R15: 0000000000000000
| [   74.232554][  T585] refcount_t: underflow; use-after-free.
| [   74.232762][  T585] WARNING: CPU: 2 PID: 585 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   74.233210][  T585] Modules linked in: cls_flower act_mirred bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth
| [   74.234234][  T585] Tainted: [B]=BAD_PAGE
[   74.234401][  T585] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   74.234628][  T585] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   74.234997][  T585] 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 05 bb 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 05 bb 	mov    $0xffffffffbb058d60,%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
[   74.235656][  T585] RSP: 0018:ffffc9000105f1f0 EFLAGS: 00010286
[   74.235907][  T585] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   74.236185][  T585] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   74.236489][  T585] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff773e134
[   74.236761][  T585] R10: 0000000000000003 R11: ffffc9000105ed80 R12: 0000000000000001
[   74.237068][  T585] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   74.237471][  T585] FS:  00007f2a5424c800(0000) GS:ffff8880794f2000(0000) knlGS:0000000000000000
[   74.237787][  T585] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   74.238027][  T585] CR2: 00000000004e68d8 CR3: 000000000c51f003 CR4: 0000000000772ef0
[   74.238432][  T585] PKRU: 55555554
[   74.238577][  T585] Call Trace:
[   74.238723][  T585]  <TASK>
[   74.238844][  T585]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   74.239053][  T585]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   74.239358][  T585]  ? generic_xdp_install (net/core/dev.c:11630)
[   74.239557][  T585]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   74.239740][  T585]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   74.240061][  T585]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   74.240307][  T585]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   74.240505][  T585]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.240739][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.241047][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.241256][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.241453][  T585]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   74.241634][  T585]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.241839][  T585]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   74.242085][  T585]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   74.242293][  T585]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.242490][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.242771][  T585]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   74.242977][  T585]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   74.243190][  T585]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   74.243396][  T585]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   74.243669][  T585]  ? 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)
[   74.243861][  T585]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   74.244069][  T585]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   74.244272][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.244568][  T585]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   74.244757][  T585]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.244966][  T585]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   74.245171][  T585]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   74.245388][  T585]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   74.245582][  T585]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   74.245821][  T585]  ? __copy_msghdr (net/socket.c:2556)
[   74.246019][  T585]  ___sys_sendmsg (net/socket.c:2686)
[   74.246327][  T585]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   74.246520][  T585]  ? __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)
[   74.246740][  T585]  ? copy_msghdr_from_user (net/socket.c:2673)
[   74.247066][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.247271][  T585]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   74.247475][  T585]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   74.247656][  T585]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   74.247845][  T585]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   74.248048][  T585]  __sys_sendmsg (net/socket.c:2716)
[   74.248259][  T585]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   74.248491][  T585]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   74.248769][  T585]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   74.248975][  T585]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   74.249174][  T585]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   74.249425][  T585] RIP: 0033:0x7f2a5441a1d7
[   74.249713][  T585] 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)
[   74.250474][  T585] RSP: 002b:00007fff839062a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   74.250741][  T585] RAX: ffffffffffffffda RBX: 00007fff839069d0 RCX: 00007f2a5441a1d7
[   74.251032][  T585] RDX: 0000000000000000 RSI: 00007fff83906310 RDI: 0000000000000005
[   74.251421][  T585] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   74.251678][  T585] R10: 00007f2a54316f60 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