======================================
| [   19.981918][  T279] ==================================================================
| [   19.982337][  T279] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   19.982656][  T279] Read of size 1 at addr ffff88800b89469c by task ip/279
| [   19.982911][  T279]
[   19.983038][  T279] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.983041][  T279] Call Trace:
[   19.983043][  T279]  <TASK>
[   19.983045][  T279]  dump_stack_lvl (lib/dump_stack.c:123)
[   19.983055][  T279]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   19.983062][  T279]  ? kobject_put (lib/kobject.c:733)
[   19.983066][  T279]  print_report (mm/kasan/report.c:483)
[   19.983069][  T279]  ? kobject_put (lib/kobject.c:733)
[   19.983071][  T279]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   19.983075][  T279]  ? kobject_put (lib/kobject.c:733)
[   19.983077][  T279]  kasan_report (mm/kasan/report.c:597)
[   19.983080][  T279]  ? kobject_put (lib/kobject.c:733)
[   19.983085][  T279]  kobject_put (lib/kobject.c:733)
[   19.983088][  T279]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   19.983096][  T279]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   19.983100][  T279]  ? generic_xdp_install (net/core/dev.c:11630)
[   19.983103][  T279]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   19.983107][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.983115][  T279]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   19.983121][  T279]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.983141][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.983146][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.983152][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.983155][  T279]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   19.983158][  T279]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.983163][  T279]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.983166][  T279]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   19.983170][  T279]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.983173][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.983180][  T279]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   19.983186][  T279]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.983189][  T279]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   19.983195][  T279]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   19.983202][  T279]  ? 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)
[   19.983207][  T279]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   19.983211][  T279]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   19.983214][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.983220][  T279]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   19.983224][  T279]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.983227][  T279]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   19.983235][  T279]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.983238][  T279]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   19.983245][  T279]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   19.983249][  T279]  ? __copy_msghdr (net/socket.c:2556)
[   19.983255][  T279]  ___sys_sendmsg (net/socket.c:2686)
[   19.983257][  T279]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   19.983260][  T279]  ? __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)
[   19.983271][  T279]  ? copy_msghdr_from_user (net/socket.c:2673)
[   19.983274][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.983279][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.983284][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.983287][  T279]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   19.983293][  T279]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.983299][  T279]  __sys_sendmsg (net/socket.c:2716)
[   19.983302][  T279]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   19.983306][  T279]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   19.983312][  T279]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   19.983316][  T279]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   19.983324][  T279]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   19.983328][  T279] RIP: 0033:0x7f67b27801d7
[   19.983336][  T279] 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)
[   19.983339][  T279] RSP: 002b:00007ffe0c68fe38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   19.983344][  T279] RAX: ffffffffffffffda RBX: 00007ffe0c690560 RCX: 00007f67b27801d7
[   19.983346][  T279] RDX: 0000000000000000 RSI: 00007ffe0c68fea0 RDI: 0000000000000005
[   19.983348][  T279] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   19.983350][  T279] R10: 00007f67b267cf60 R11: 0000000000000246 R12: 0000000000000001
[   19.983351][  T279] R13: 00000000690dead3 R14: 0000000000499600 R15: 0000000000000000
| [   20.015440][  T279] refcount_t: underflow; use-after-free.
| [   20.015678][  T279] WARNING: CPU: 3 PID: 279 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   20.016069][  T279] Modules linked in:
| [   20.016919][  T279] Tainted: [B]=BAD_PAGE
[   20.017141][  T279] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.017485][  T279] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   20.017754][  T279] 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 05 af 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 05 af 	mov    $0xffffffffaf05a860,%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
[   20.018434][  T279] RSP: 0018:ffffc90000c371f0 EFLAGS: 00010286
[   20.018670][  T279] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   20.018962][  T279] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   20.019272][  T279] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5f3e134
[   20.019555][  T279] R10: 0000000000000003 R11: ffffc90000c36d80 R12: 0000000000000001
[   20.019859][  T279] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   20.020173][  T279] FS:  00007f67b25b2800(0000) GS:ffff888085501000(0000) knlGS:0000000000000000
[   20.020525][  T279] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.020770][  T279] CR2: 00007f9093a534c0 CR3: 0000000004c3c004 CR4: 0000000000772ef0
[   20.021118][  T279] PKRU: 55555554
[   20.021284][  T279] Call Trace:
[   20.021427][  T279]  <TASK>
[   20.021530][  T279]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   20.021735][  T279]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   20.021956][  T279]  ? generic_xdp_install (net/core/dev.c:11630)
[   20.022185][  T279]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   20.022372][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.022563][  T279]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   20.022762][  T279]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   20.023049][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.023247][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.023438][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.023631][  T279]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   20.023829][  T279]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.024056][  T279]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   20.024284][  T279]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   20.024468][  T279]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   20.024651][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.024853][  T279]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   20.025079][  T279]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   20.025271][  T279]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   20.025456][  T279]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   20.025639][  T279]  ? 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)
[   20.025826][  T279]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   20.026082][  T279]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   20.026345][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.026622][  T279]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   20.026919][  T279]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   20.027180][  T279]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   20.027391][  T279]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   20.027604][  T279]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   20.027888][  T279]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   20.028221][  T279]  ? __copy_msghdr (net/socket.c:2556)
[   20.028504][  T279]  ___sys_sendmsg (net/socket.c:2686)
[   20.028780][  T279]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   20.028988][  T279]  ? __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)
[   20.029229][  T279]  ? copy_msghdr_from_user (net/socket.c:2673)
[   20.029409][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.029586][  T279]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.029769][  T279]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.029976][  T279]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   20.030234][  T279]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.030479][  T279]  __sys_sendmsg (net/socket.c:2716)
[   20.030748][  T279]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   20.031089][  T279]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   20.031376][  T279]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   20.031687][  T279]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   20.031979][  T279]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   20.032304][  T279] RIP: 0033:0x7f67b27801d7
[   20.032621][  T279] 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)
[   20.033647][  T279] RSP: 002b:00007ffe0c68fe38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   20.034085][  T279] RAX: ffffffffffffffda RBX: 00007ffe0c690560 RCX: 00007f67b27801d7
[   20.034513][  T279] RDX: 0000000000000000 RSI: 00007ffe0c68fea0 RDI: 0000000000000005
[   20.034949][  T279] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   20.035377][  T279] R10: 00007f67b267cf60 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