======================================
| [   24.347959][  T285] ==================================================================
| [   24.348316][  T285] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   24.348621][  T285] Read of size 1 at addr ffff888008cda69c by task ip/285
| [   24.348872][  T285]
[   24.348976][  T285] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.348978][  T285] Call Trace:
[   24.348980][  T285]  <TASK>
[   24.348982][  T285]  dump_stack_lvl (lib/dump_stack.c:123)
[   24.348987][  T285]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   24.348994][  T285]  ? kobject_put (lib/kobject.c:733)
[   24.348997][  T285]  print_report (mm/kasan/report.c:483)
[   24.349000][  T285]  ? kobject_put (lib/kobject.c:733)
[   24.349002][  T285]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   24.349005][  T285]  ? kobject_put (lib/kobject.c:733)
[   24.349007][  T285]  kasan_report (mm/kasan/report.c:597)
[   24.349010][  T285]  ? kobject_put (lib/kobject.c:733)
[   24.349015][  T285]  kobject_put (lib/kobject.c:733)
[   24.349018][  T285]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   24.349023][  T285]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   24.349027][  T285]  ? generic_xdp_install (net/core/dev.c:11630)
[   24.349030][  T285]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   24.349033][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.349041][  T285]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   24.349046][  T285]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.349065][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.349070][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.349075][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.349078][  T285]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   24.349081][  T285]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.349085][  T285]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.349088][  T285]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   24.349092][  T285]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.349095][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.349102][  T285]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   24.349106][  T285]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.349110][  T285]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   24.349116][  T285]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   24.349121][  T285]  ? 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)
[   24.349126][  T285]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   24.349130][  T285]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   24.349133][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.349138][  T285]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   24.349142][  T285]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.349145][  T285]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   24.349152][  T285]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.349155][  T285]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   24.349161][  T285]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   24.349164][  T285]  ? __copy_msghdr (net/socket.c:2556)
[   24.349171][  T285]  ___sys_sendmsg (net/socket.c:2686)
[   24.349173][  T285]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   24.349176][  T285]  ? __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)
[   24.349181][  T285]  ? copy_msghdr_from_user (net/socket.c:2673)
[   24.349185][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.349189][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.349195][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.349198][  T285]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   24.349203][  T285]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.349209][  T285]  __sys_sendmsg (net/socket.c:2716)
[   24.349211][  T285]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   24.349214][  T285]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   24.349221][  T285]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   24.349225][  T285]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   24.349230][  T285]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   24.349233][  T285] RIP: 0033:0x7f8afdc651d7
[   24.349239][  T285] 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)
[   24.349241][  T285] RSP: 002b:00007ffe9c688d28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   24.349246][  T285] RAX: ffffffffffffffda RBX: 00007ffe9c689450 RCX: 00007f8afdc651d7
[   24.349248][  T285] RDX: 0000000000000000 RSI: 00007ffe9c688d90 RDI: 0000000000000005
[   24.349250][  T285] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   24.349251][  T285] R10: 00007f8afdb61f60 R11: 0000000000000246 R12: 0000000000000001
[   24.349253][  T285] R13: 00000000690df7be R14: 0000000000499600 R15: 0000000000000000
| [   24.384822][  T285] refcount_t: underflow; use-after-free.
| [   24.385055][  T285] WARNING: CPU: 2 PID: 285 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   24.385394][  T285] Modules linked in:
| [   24.385968][  T285] Tainted: [B]=BAD_PAGE
[   24.386136][  T285] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.386390][  T285] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   24.386652][  T285] Code: a2 b5 02 80 fb 01 0f 87 db 6e d8 fe 83 e3 01 0f 85 51 ff ff ff c6 05 c2 a2 b5 02 01 90 48 c7 c7 60 a8 a5 8e e8 72 c3 17 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 20 69 a0 ff e9 ba fe ff ff
All code
========
   0:	a2 b5 02 80 fb 01 0f 	movabs %al,0xdb870f01fb8002b5
   7:	87 db 
   9:	6e                   	outsb  %ds:(%rsi),(%dx)
   a:	d8 fe                	fdivr  %st(6),%st
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 c2 a2 b5 02 01 	movb   $0x1,0x2b5a2c2(%rip)        # 0x2b5a2de
  1c:	90                   	nop
  1d:	48 c7 c7 60 a8 a5 8e 	mov    $0xffffffff8ea5a860,%rdi
  24:	e8 72 c3 17 ff       	call   0xffffffffff17c39b
  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 20 69 a0 ff       	call   0xffffffffffa0695b
  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 20 69 a0 ff       	call   0xffffffffffa06931
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   24.387299][  T285] RSP: 0018:ffffc90000ca71f0 EFLAGS: 00010286
[   24.387557][  T285] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   24.387837][  T285] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   24.388123][  T285] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1e7e134
[   24.388411][  T285] R10: 0000000000000003 R11: ffffc90000ca6d80 R12: 0000000000000001
[   24.388695][  T285] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   24.388996][  T285] FS:  00007f8afda97800(0000) GS:ffff8880a5a81000(0000) knlGS:0000000000000000
[   24.389321][  T285] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   24.390248][  T285] CR2: 00000000004e5840 CR3: 000000000beca005 CR4: 0000000000772ef0
[   24.390617][  T285] PKRU: 55555554
[   24.390829][  T285] Call Trace:
[   24.391052][  T285]  <TASK>
[   24.391242][  T285]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   24.391518][  T285]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   24.391770][  T285]  ? generic_xdp_install (net/core/dev.c:11630)
[   24.392029][  T285]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   24.392286][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.392555][  T285]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   24.392809][  T285]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.393133][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.393389][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.393695][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.393953][  T285]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   24.394218][  T285]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.394482][  T285]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.394776][  T285]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   24.395046][  T285]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.395302][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.395574][  T285]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   24.395829][  T285]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.396096][  T285]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   24.396357][  T285]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   24.396624][  T285]  ? 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)
[   24.396883][  T285]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   24.397153][  T285]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   24.397423][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.397678][  T285]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   24.397933][  T285]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.398198][  T285]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   24.398466][  T285]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.398720][  T285]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   24.399012][  T285]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   24.399316][  T285]  ? __copy_msghdr (net/socket.c:2556)
[   24.399585][  T285]  ___sys_sendmsg (net/socket.c:2686)
[   24.399838][  T285]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   24.400103][  T285]  ? __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)
[   24.400419][  T285]  ? copy_msghdr_from_user (net/socket.c:2673)
[   24.400675][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.400937][  T285]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.401206][  T285]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.401471][  T285]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   24.401724][  T285]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.401988][  T285]  __sys_sendmsg (net/socket.c:2716)
[   24.402245][  T285]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   24.402553][  T285]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   24.402808][  T285]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   24.403087][  T285]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   24.403346][  T285]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   24.403655][  T285] RIP: 0033:0x7f8afdc651d7
[   24.403927][  T285] 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)
[   24.404688][  T285] RSP: 002b:00007ffe9c688d28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   24.405050][  T285] RAX: ffffffffffffffda RBX: 00007ffe9c689450 RCX: 00007f8afdc651d7
[   24.405415][  T285] RDX: 0000000000000000 RSI: 00007ffe9c688d90 RDI: 0000000000000005
[   24.405762][  T285] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   24.406134][  T285] R10: 00007f8afdb61f60 R11: 0000000000000246 R12: 0000000000000001


Finger prints:
refcount_warn_saturate:netdev_run_todo:rtnl_dellink:rtnetlink_rcv_msg:netlink_rcv_skb
print_report:kasan_report:kobject_put:netdev_run_todo:rtnl_dellink