======================================
| [   49.614169][  T451] ==================================================================
| [   49.614656][  T451] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   49.615079][  T451] Read of size 1 at addr ffff88800a8396c4 by task ip/451
| [   49.615416][  T451]
[   49.615564][  T451] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   49.615567][  T451] Call Trace:
[   49.615570][  T451]  <TASK>
[   49.615573][  T451]  dump_stack_lvl (lib/dump_stack.c:123)
[   49.615582][  T451]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   49.615593][  T451]  ? kobject_put (lib/kobject.c:733)
[   49.615599][  T451]  print_report (mm/kasan/report.c:483)
[   49.615604][  T451]  ? kobject_put (lib/kobject.c:733)
[   49.615609][  T451]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   49.615615][  T451]  ? kobject_put (lib/kobject.c:733)
[   49.615619][  T451]  kasan_report (mm/kasan/report.c:597)
[   49.615626][  T451]  ? kobject_put (lib/kobject.c:733)
[   49.615635][  T451]  kobject_put (lib/kobject.c:733)
[   49.615640][  T451]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   49.615651][  T451]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   49.615657][  T451]  ? generic_xdp_install (net/core/dev.c:11630)
[   49.615662][  T451]  ? 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)
[   49.615673][  T451]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   49.615681][  T451]  ? br_dev_delete (net/bridge/br_if.c:397)
[   49.615689][  T451]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   49.615700][  T451]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   49.615736][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.615749][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.615759][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.615766][  T451]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   49.615771][  T451]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   49.615778][  T451]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   49.615784][  T451]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   49.615791][  T451]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   49.615797][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.615809][  T451]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   49.615815][  T451]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   49.615822][  T451]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   49.615834][  T451]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   49.615838][  T451]  ? 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)
[   49.615844][  T451]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   49.615852][  T451]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   49.615857][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.615864][  T451]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   49.615870][  T451]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   49.615876][  T451]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   49.615885][  T451]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   49.615891][  T451]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   49.615899][  T451]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   49.615903][  T451]  ? __copy_msghdr (net/socket.c:2556)
[   49.615917][  T451]  ___sys_sendmsg (net/socket.c:2686)
[   49.615922][  T451]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   49.615928][  T451]  ? __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)
[   49.615937][  T451]  ? copy_msghdr_from_user (net/socket.c:2673)
[   49.615945][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.615953][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.615962][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.615969][  T451]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   49.615979][  T451]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   49.615990][  T451]  __sys_sendmsg (net/socket.c:2716)
[   49.615995][  T451]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   49.616000][  T451]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   49.616014][  T451]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   49.616025][  T451]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   49.616034][  T451]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   49.616041][  T451] RIP: 0033:0x7f8b5c0e71d7
[   49.616048][  T451] 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)
[   49.616053][  T451] RSP: 002b:00007ffe2972bee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   49.616060][  T451] RAX: ffffffffffffffda RBX: 00007ffe2972c610 RCX: 00007f8b5c0e71d7
[   49.616063][  T451] RDX: 0000000000000000 RSI: 00007ffe2972bf50 RDI: 0000000000000005
[   49.616066][  T451] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   49.616069][  T451] R10: 00007f8b5bfe3f60 R11: 0000000000000246 R12: 0000000000000001
[   49.616072][  T451] R13: 00000000690df195 R14: 0000000000499600 R15: 0000000000000000
| [   49.643973][  T451] refcount_t: underflow; use-after-free.
| [   49.644252][  T451] WARNING: CPU: 1 PID: 451 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   49.644729][  T451] Modules linked in:
| [   49.645510][  T451] Tainted: [B]=BAD_PAGE
[   49.645725][  T451] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   49.646080][  T451] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   49.646460][  T451] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba e5 92 e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
All code
========
   0:	cc                   	int3
   1:	38 03                	cmp    %al,(%rbx)
   3:	80 fb 01             	cmp    $0x1,%bl
   6:	0f 87 29 33 d7 fe    	ja     0xfffffffffed73335
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 17 cc 38 03 01 	movb   $0x1,0x338cc17(%rip)        # 0x338cc33
  1c:	90                   	nop
  1d:	48 c7 c7 40 ba e5 92 	mov    $0xffffffff92e5ba40,%rdi
  24:	e8 62 d6 16 ff       	call   0xffffffffff16d68b
  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 c0 9d a0 ff       	call   0xffffffffffa09dfb
  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 c0 9d a0 ff       	call   0xffffffffffa09dd1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   49.647479][  T451] RSP: 0018:ffffc900010271f0 EFLAGS: 00010286
[   49.647838][  T451] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   49.648255][  T451] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   49.648682][  T451] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff27c0934
[   49.649026][  T451] R10: 0000000000000003 R11: ffffc90001026d80 R12: 0000000000000001
[   49.649302][  T451] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   49.649574][  T451] FS:  00007f8b5bf19800(0000) GS:ffff8880d7d88000(0000) knlGS:0000000000000000
[   49.649878][  T451] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   49.650139][  T451] CR2: 00007fc754e71980 CR3: 000000000a02d004 CR4: 0000000000772ef0
[   49.650407][  T451] PKRU: 55555554
[   49.650552][  T451] Call Trace:
[   49.650684][  T451]  <TASK>
[   49.650774][  T451]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   49.650951][  T451]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   49.651134][  T451]  ? generic_xdp_install (net/core/dev.c:11630)
[   49.651314][  T451]  ? 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)
[   49.651499][  T451]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   49.651674][  T451]  ? br_dev_delete (net/bridge/br_if.c:397)
[   49.651870][  T451]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   49.652059][  T451]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   49.652288][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.652573][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.652759][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.652945][  T451]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   49.653210][  T451]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   49.653683][  T451]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   49.654027][  T451]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   49.654310][  T451]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   49.654772][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.655058][  T451]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   49.655348][  T451]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   49.655635][  T451]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   49.655953][  T451]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   49.656133][  T451]  ? 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)
[   49.656306][  T451]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   49.656485][  T451]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   49.656760][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.656945][  T451]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   49.657184][  T451]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   49.657458][  T451]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   49.657878][  T451]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   49.658147][  T451]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   49.658419][  T451]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   49.658777][  T451]  ? __copy_msghdr (net/socket.c:2556)
[   49.659238][  T451]  ___sys_sendmsg (net/socket.c:2686)
[   49.659538][  T451]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   49.659821][  T451]  ? __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)
[   49.660165][  T451]  ? copy_msghdr_from_user (net/socket.c:2673)
[   49.660636][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.660916][  T451]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   49.661198][  T451]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   49.661489][  T451]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   49.661954][  T451]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   49.662253][  T451]  __sys_sendmsg (net/socket.c:2716)
[   49.662485][  T451]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   49.662753][  T451]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   49.663021][  T451]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   49.663213][  T451]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   49.663374][  T451]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   49.663676][  T451] RIP: 0033:0x7f8b5c0e71d7
[   49.663856][  T451] 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)
[   49.664595][  T451] RSP: 002b:00007ffe2972bee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   49.664858][  T451] RAX: ffffffffffffffda RBX: 00007ffe2972c610 RCX: 00007f8b5c0e71d7
[   49.665133][  T451] RDX: 0000000000000000 RSI: 00007ffe2972bf50 RDI: 0000000000000005
[   49.665474][  T451] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   49.665710][  T451] R10: 00007f8b5bfe3f60 R11: 0000000000000246 R12: 0000000000000001


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