======================================
| [   18.081066][  T274] ==================================================================
| [   18.081478][  T274] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   18.081855][  T274] Read of size 1 at addr ffff88800b94a69c by task ip/274
| [   18.082148][  T274]
[   18.082254][  T274] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.082256][  T274] Call Trace:
[   18.082258][  T274]  <TASK>
[   18.082260][  T274]  dump_stack_lvl (lib/dump_stack.c:123)
[   18.082268][  T274]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   18.082277][  T274]  ? kobject_put (lib/kobject.c:733)
[   18.082283][  T274]  print_report (mm/kasan/report.c:483)
[   18.082287][  T274]  ? kobject_put (lib/kobject.c:733)
[   18.082290][  T274]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   18.082293][  T274]  ? kobject_put (lib/kobject.c:733)
[   18.082295][  T274]  kasan_report (mm/kasan/report.c:597)
[   18.082299][  T274]  ? kobject_put (lib/kobject.c:733)
[   18.082304][  T274]  kobject_put (lib/kobject.c:733)
[   18.082307][  T274]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.082314][  T274]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   18.082320][  T274]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.082325][  T274]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   18.082331][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.082338][  T274]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   18.082344][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.082371][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.082379][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.082385][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.082389][  T274]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   18.082391][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.082396][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.082399][  T274]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   18.082406][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.082411][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.082424][  T274]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   18.082428][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.082432][  T274]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   18.082438][  T274]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   18.082442][  T274]  ? 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)
[   18.082447][  T274]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   18.082451][  T274]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   18.082454][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.082460][  T274]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   18.082468][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.082474][  T274]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   18.082482][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.082486][  T274]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   18.082491][  T274]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   18.082494][  T274]  ? __copy_msghdr (net/socket.c:2556)
[   18.082500][  T274]  ___sys_sendmsg (net/socket.c:2686)
[   18.082502][  T274]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   18.082506][  T274]  ? __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)
[   18.082513][  T274]  ? copy_msghdr_from_user (net/socket.c:2673)
[   18.082521][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.082528][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.082534][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.082537][  T274]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   18.082541][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.082547][  T274]  __sys_sendmsg (net/socket.c:2716)
[   18.082550][  T274]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   18.082556][  T274]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   18.082569][  T274]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.082575][  T274]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.082579][  T274]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.082583][  T274] RIP: 0033:0x7f16773e41d7
[   18.082589][  T274] 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)
[   18.082592][  T274] RSP: 002b:00007ffd97efd328 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   18.082596][  T274] RAX: ffffffffffffffda RBX: 00007ffd97efda50 RCX: 00007f16773e41d7
[   18.082598][  T274] RDX: 0000000000000000 RSI: 00007ffd97efd390 RDI: 0000000000000005
[   18.082600][  T274] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   18.082603][  T274] R10: 00007f16772e0f60 R11: 0000000000000246 R12: 0000000000000002
[   18.082606][  T274] R13: 00000000690def5c R14: 0000000000499600 R15: 0000000000000000
| [   18.114340][  T274] refcount_t: underflow; use-after-free.
| [   18.114574][  T274] WARNING: CPU: 3 PID: 274 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   18.114922][  T274] Modules linked in:
| [   18.115547][  T274] Tainted: [B]=BAD_PAGE
[   18.115702][  T274] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.115965][  T274] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   18.116202][  T274] 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 c5 a0 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 c5 a0 	mov    $0xffffffffa0c5a860,%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
[   18.117026][  T274] RSP: 0018:ffffc90000bf71f0 EFLAGS: 00010286
[   18.117257][  T274] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   18.117538][  T274] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   18.117958][  T274] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff42be134
[   18.118233][  T274] R10: 0000000000000003 R11: ffffc90000bf6d80 R12: 0000000000000001
[   18.118617][  T274] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   18.118912][  T274] FS:  00007f1677216800(0000) GS:ffff888093901000(0000) knlGS:0000000000000000
[   18.119223][  T274] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.119544][  T274] CR2: 00007eff8364d5f0 CR3: 000000000a8d5001 CR4: 0000000000772ef0
[   18.119810][  T274] PKRU: 55555554
[   18.119945][  T274] Call Trace:
[   18.120078][  T274]  <TASK>
[   18.120285][  T274]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.120471][  T274]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   18.120655][  T274]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.120838][  T274]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   18.121128][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.121326][  T274]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   18.121531][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.121843][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.122177][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.122376][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.122572][  T274]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   18.122771][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.123094][  T274]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.123329][  T274]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   18.123517][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.123707][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.124018][  T274]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   18.124232][  T274]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.124414][  T274]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   18.124629][  T274]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   18.124961][  T274]  ? 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)
[   18.125150][  T274]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   18.125318][  T274]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   18.125492][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.125789][  T274]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   18.126004][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.126186][  T274]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   18.126377][  T274]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.126680][  T274]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   18.126850][  T274]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   18.127094][  T274]  ? __copy_msghdr (net/socket.c:2556)
[   18.127269][  T274]  ___sys_sendmsg (net/socket.c:2686)
[   18.127566][  T274]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   18.127748][  T274]  ? __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)
[   18.127995][  T274]  ? copy_msghdr_from_user (net/socket.c:2673)
[   18.128286][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.128492][  T274]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.128682][  T274]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.128857][  T274]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   18.129155][  T274]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.129332][  T274]  __sys_sendmsg (net/socket.c:2716)
[   18.129500][  T274]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   18.129712][  T274]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   18.129985][  T274]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.130152][  T274]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.130376][  T274]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.130632][  T274] RIP: 0033:0x7f16773e41d7
[   18.130960][  T274] 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)
[   18.131803][  T274] RSP: 002b:00007ffd97efd328 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   18.132118][  T274] RAX: ffffffffffffffda RBX: 00007ffd97efda50 RCX: 00007f16773e41d7
[   18.132450][  T274] RDX: 0000000000000000 RSI: 00007ffd97efd390 RDI: 0000000000000005
[   18.132882][  T274] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   18.133223][  T274] R10: 00007f16772e0f60 R11: 0000000000000246 R12: 0000000000000002


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