======================================
| [   23.940428][  T286] ==================================================================
| [   23.940828][  T286] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   23.941091][  T286] Read of size 1 at addr ffff8880059c269c by task ip/286
| [   23.941326][  T286]
[   23.941435][  T286] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.941438][  T286] Call Trace:
[   23.941441][  T286]  <TASK>
[   23.941443][  T286]  dump_stack_lvl (lib/dump_stack.c:123)
[   23.941448][  T286]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   23.941456][  T286]  ? kobject_put (lib/kobject.c:733)
[   23.941459][  T286]  print_report (mm/kasan/report.c:483)
[   23.941462][  T286]  ? kobject_put (lib/kobject.c:733)
[   23.941464][  T286]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   23.941468][  T286]  ? kobject_put (lib/kobject.c:733)
[   23.941470][  T286]  kasan_report (mm/kasan/report.c:597)
[   23.941474][  T286]  ? kobject_put (lib/kobject.c:733)
[   23.941478][  T286]  kobject_put (lib/kobject.c:733)
[   23.941481][  T286]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   23.941488][  T286]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   23.941491][  T286]  ? generic_xdp_install (net/core/dev.c:11630)
[   23.941495][  T286]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   23.941498][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.941507][  T286]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   23.941513][  T286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.941531][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.941536][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.941541][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.941545][  T286]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   23.941547][  T286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.941552][  T286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.941555][  T286]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   23.941559][  T286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.941562][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.941568][  T286]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   23.941573][  T286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.941577][  T286]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   23.941583][  T286]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   23.941589][  T286]  ? 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)
[   23.941593][  T286]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   23.941597][  T286]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   23.941600][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.941606][  T286]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   23.941609][  T286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.941612][  T286]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   23.941621][  T286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.941624][  T286]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   23.941631][  T286]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   23.941634][  T286]  ? __copy_msghdr (net/socket.c:2556)
[   23.941641][  T286]  ___sys_sendmsg (net/socket.c:2686)
[   23.941643][  T286]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   23.941646][  T286]  ? __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)
[   23.941651][  T286]  ? copy_msghdr_from_user (net/socket.c:2673)
[   23.941655][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.941659][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.941665][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.941668][  T286]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   23.941673][  T286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.941679][  T286]  __sys_sendmsg (net/socket.c:2716)
[   23.941681][  T286]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   23.941684][  T286]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   23.941691][  T286]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   23.941695][  T286]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   23.941699][  T286]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   23.941703][  T286] RIP: 0033:0x7fc91c0e71d7
[   23.941709][  T286] 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)
[   23.941712][  T286] RSP: 002b:00007ffcf562e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   23.941717][  T286] RAX: ffffffffffffffda RBX: 00007ffcf562e760 RCX: 00007fc91c0e71d7
[   23.941719][  T286] RDX: 0000000000000000 RSI: 00007ffcf562e0a0 RDI: 0000000000000005
[   23.941720][  T286] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   23.941722][  T286] R10: 00007fc91bfe3f60 R11: 0000000000000246 R12: 0000000000000001
[   23.941724][  T286] R13: 00000000690df88f R14: 0000000000499600 R15: 0000000000000000
| [   23.973406][  T286] refcount_t: underflow; use-after-free.
| [   23.974228][  T286] WARNING: CPU: 3 PID: 286 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   23.974552][  T286] Modules linked in:
| [   23.975037][  T286] Tainted: [B]=BAD_PAGE
[   23.975180][  T286] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.975398][  T286] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   23.975669][  T286] 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 65 ac 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 65 ac 	mov    $0xffffffffac65a860,%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
[   23.976306][  T286] RSP: 0018:ffffc90000d971f0 EFLAGS: 00010286
[   23.976543][  T286] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   23.976796][  T286] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   23.977059][  T286] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff59fe134
[   23.977312][  T286] R10: 0000000000000003 R11: ffffc90000d96d80 R12: 0000000000000001
[   23.977607][  T286] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   23.977857][  T286] FS:  00007fc91bf19800(0000) GS:ffff888087f01000(0000) knlGS:0000000000000000
[   23.978156][  T286] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   23.978358][  T286] CR2: 00007fb8a78fd100 CR3: 00000000056d4004 CR4: 0000000000772ef0
[   23.978619][  T286] PKRU: 55555554
[   23.978744][  T286] Call Trace:
[   23.978864][  T286]  <TASK>
[   23.978948][  T286]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   23.979220][  T286]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   23.979398][  T286]  ? generic_xdp_install (net/core/dev.c:11630)
[   23.979564][  T286]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   23.979737][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.980021][  T286]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   23.980210][  T286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.980430][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.980596][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.980871][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.981041][  T286]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   23.981205][  T286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.981364][  T286]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.981581][  T286]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   23.981753][  T286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.981928][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.982088][  T286]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   23.982368][  T286]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.982546][  T286]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   23.982712][  T286]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   23.982881][  T286]  ? 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)
[   23.983133][  T286]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   23.983305][  T286]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   23.983470][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.983630][  T286]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   23.983881][  T286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.984053][  T286]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   23.984220][  T286]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.984390][  T286]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   23.984663][  T286]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   23.984858][  T286]  ? __copy_msghdr (net/socket.c:2556)
[   23.985034][  T286]  ___sys_sendmsg (net/socket.c:2686)
[   23.985191][  T286]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   23.985488][  T286]  ? __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)
[   23.985707][  T286]  ? copy_msghdr_from_user (net/socket.c:2673)
[   23.985885][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.986153][  T286]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.986312][  T286]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.986482][  T286]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   23.986652][  T286]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.986915][  T286]  __sys_sendmsg (net/socket.c:2716)
[   23.987072][  T286]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   23.987273][  T286]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   23.987436][  T286]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   23.987706][  T286]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   23.987879][  T286]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   23.988091][  T286] RIP: 0033:0x7fc91c0e71d7
[   23.988277][  T286] 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)
[   23.989005][  T286] RSP: 002b:00007ffcf562e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   23.989259][  T286] RAX: ffffffffffffffda RBX: 00007ffcf562e760 RCX: 00007fc91c0e71d7
[   23.989507][  T286] RDX: 0000000000000000 RSI: 00007ffcf562e0a0 RDI: 0000000000000005
[   23.989756][  T286] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   23.990113][  T286] R10: 00007fc91bfe3f60 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