======================================
| [   24.908748][  T295] ==================================================================
| [   24.909226][  T295] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   24.909706][  T295] Read of size 1 at addr ffff888004f6269c by task ip/295
| [   24.910064][  T295]
[   24.910231][  T295] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.910238][  T295] Call Trace:
[   24.910244][  T295]  <TASK>
[   24.910247][  T295]  dump_stack_lvl (lib/dump_stack.c:123)
[   24.910265][  T295]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   24.910291][  T295]  ? kobject_put (lib/kobject.c:733)
[   24.910298][  T295]  print_report (mm/kasan/report.c:483)
[   24.910303][  T295]  ? kobject_put (lib/kobject.c:733)
[   24.910307][  T295]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   24.910313][  T295]  ? kobject_put (lib/kobject.c:733)
[   24.910316][  T295]  kasan_report (mm/kasan/report.c:597)
[   24.910323][  T295]  ? kobject_put (lib/kobject.c:733)
[   24.910332][  T295]  kobject_put (lib/kobject.c:733)
[   24.910337][  T295]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   24.910355][  T295]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   24.910360][  T295]  ? generic_xdp_install (net/core/dev.c:11630)
[   24.910365][  T295]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   24.910369][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.910388][  T295]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   24.910401][  T295]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.910433][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.910440][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.910448][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.910453][  T295]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   24.910457][  T295]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.910464][  T295]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.910468][  T295]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   24.910474][  T295]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.910478][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.910488][  T295]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   24.910500][  T295]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.910505][  T295]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   24.910516][  T295]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   24.910525][  T295]  ? 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)
[   24.910532][  T295]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   24.910538][  T295]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   24.910543][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.910551][  T295]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   24.910557][  T295]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.910562][  T295]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   24.910585][  T295]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.910590][  T295]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   24.910604][  T295]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   24.910609][  T295]  ? __copy_msghdr (net/socket.c:2556)
[   24.910622][  T295]  ___sys_sendmsg (net/socket.c:2686)
[   24.910626][  T295]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   24.910631][  T295]  ? __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)
[   24.910644][  T295]  ? copy_msghdr_from_user (net/socket.c:2673)
[   24.910650][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.910656][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.910663][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.910669][  T295]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   24.910689][  T295]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.910701][  T295]  __sys_sendmsg (net/socket.c:2716)
[   24.910705][  T295]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   24.910711][  T295]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   24.910724][  T295]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   24.910730][  T295]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   24.910740][  T295]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   24.910750][  T295] RIP: 0033:0x7fab4d92b1d7
[   24.910764][  T295] 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)
[   24.910770][  T295] RSP: 002b:00007fff027380b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   24.910781][  T295] RAX: ffffffffffffffda RBX: 00007fff027387f0 RCX: 00007fab4d92b1d7
[   24.910789][  T295] RDX: 0000000000000000 RSI: 00007fff02738120 RDI: 0000000000000005
[   24.910792][  T295] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   24.910794][  T295] R10: 00007fab4d827510 R11: 0000000000000246 R12: 0000000000000001
[   24.910796][  T295] R13: 00000000690de181 R14: 0000000000499600 R15: 0000000000000000
| [   24.955122][  T295] refcount_t: underflow; use-after-free.
| [   24.955393][  T295] WARNING: CPU: 0 PID: 295 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   24.955720][  T295] Modules linked in:
| [   24.956238][  T295] Tainted: [B]=BAD_PAGE
[   24.956378][  T295] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   24.956614][  T295] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   24.956852][  T295] 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 85 86 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 85 86 	mov    $0xffffffff8685a860,%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
[   24.957486][  T295] RSP: 0018:ffffc90000e371f0 EFLAGS: 00010286
[   24.957719][  T295] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   24.958029][  T295] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   24.958303][  T295] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0e3e134
[   24.958579][  T295] R10: 0000000000000003 R11: ffffc90000e36d80 R12: 0000000000000001
[   24.958948][  T295] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   24.959211][  T295] FS:  00007fab4d75d800(0000) GS:ffff8880a7d81000(0000) knlGS:0000000000000000
[   24.959631][  T295] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   24.959864][  T295] CR2: 000055c136505dec CR3: 000000000b2f1004 CR4: 0000000000772ef0
[   24.960144][  T295] PKRU: 55555554
[   24.960277][  T295] Call Trace:
[   24.960509][  T295]  <TASK>
[   24.960617][  T295]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   24.960804][  T295]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   24.960989][  T295]  ? generic_xdp_install (net/core/dev.c:11630)
[   24.961163][  T295]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   24.961431][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.961616][  T295]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   24.961795][  T295]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.962118][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.962297][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.962480][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.962663][  T295]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   24.962935][  T295]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.963105][  T295]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   24.963319][  T295]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   24.963489][  T295]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.963773][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.963959][  T295]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   24.964132][  T295]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   24.964305][  T295]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   24.964577][  T295]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   24.964753][  T295]  ? 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)
[   24.964927][  T295]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   24.965103][  T295]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   24.965368][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.965559][  T295]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   24.965735][  T295]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.965913][  T295]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   24.966180][  T295]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   24.966351][  T295]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   24.966532][  T295]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   24.966751][  T295]  ? __copy_msghdr (net/socket.c:2556)
[   24.967021][  T295]  ___sys_sendmsg (net/socket.c:2686)
[   24.967198][  T295]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   24.967371][  T295]  ? __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)
[   24.967698][  T295]  ? copy_msghdr_from_user (net/socket.c:2673)
[   24.967874][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.968048][  T295]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   24.968219][  T295]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   24.968390][  T295]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   24.968671][  T295]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   24.968856][  T295]  __sys_sendmsg (net/socket.c:2716)
[   24.969033][  T295]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   24.969392][  T295]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   24.969651][  T295]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   24.969920][  T295]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   24.970154][  T295]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   24.970677][  T295] RIP: 0033:0x7fab4d92b1d7
[   24.970946][  T295] 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)
[   24.972095][  T295] RSP: 002b:00007fff027380b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   24.972506][  T295] RAX: ffffffffffffffda RBX: 00007fff027387f0 RCX: 00007fab4d92b1d7
[   24.973107][  T295] RDX: 0000000000000000 RSI: 00007fff02738120 RDI: 0000000000000005
[   24.973506][  T295] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   24.973912][  T295] R10: 00007fab4d827510 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