======================================
| xx__-> [   18.987599][  T260] ==================================================================
| [   18.988108][  T260] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   18.988547][  T260] Read of size 1 at addr ffff88800efa96c4 by task ip/260
| [   18.988892][  T260]
[   18.989045][  T260] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.989048][  T260] Call Trace:
[   18.989053][  T260]  <TASK>
[   18.989056][  T260]  dump_stack_lvl (lib/dump_stack.c:123)
[   18.989066][  T260]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   18.989081][  T260]  ? kobject_put (lib/kobject.c:733)
[   18.989087][  T260]  print_report (mm/kasan/report.c:483)
[   18.989093][  T260]  ? kobject_put (lib/kobject.c:733)
[   18.989098][  T260]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   18.989104][  T260]  ? kobject_put (lib/kobject.c:733)
[   18.989109][  T260]  kasan_report (mm/kasan/report.c:597)
[   18.989116][  T260]  ? kobject_put (lib/kobject.c:733)
[   18.989125][  T260]  kobject_put (lib/kobject.c:733)
[   18.989131][  T260]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.989142][  T260]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   18.989148][  T260]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.989154][  T260]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   18.989160][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.989172][  T260]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   18.989180][  T260]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.989215][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.989224][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.989233][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.989240][  T260]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   18.989244][  T260]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.989252][  T260]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.989258][  T260]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   18.989265][  T260]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.989271][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.989283][  T260]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   18.989291][  T260]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.989298][  T260]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   18.989311][  T260]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   18.989315][  T260]  ? 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)
[   18.989322][  T260]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   18.989330][  T260]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   18.989336][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.989345][  T260]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   18.989353][  T260]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.989359][  T260]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   18.989371][  T260]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.989377][  T260]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   18.989384][  T260]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   18.989388][  T260]  ? __copy_msghdr (net/socket.c:2556)
[   18.989401][  T260]  ___sys_sendmsg (net/socket.c:2686)
[   18.989406][  T260]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   18.989411][  T260]  ? __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)
[   18.989420][  T260]  ? copy_msghdr_from_user (net/socket.c:2673)
[   18.989429][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.989437][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.989446][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.989453][  T260]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   18.989464][  T260]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.989475][  T260]  __sys_sendmsg (net/socket.c:2716)
[   18.989479][  T260]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   18.989484][  T260]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   18.989498][  T260]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.989506][  T260]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.989514][  T260]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.989520][  T260] RIP: 0033:0x7f71997ac1d7
[   18.989528][  T260] 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)
[   18.989533][  T260] RSP: 002b:00007ffdbb4ec828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   18.989541][  T260] RAX: ffffffffffffffda RBX: 00007ffdbb4ecf60 RCX: 00007f71997ac1d7
[   18.989545][  T260] RDX: 0000000000000000 RSI: 00007ffdbb4ec890 RDI: 0000000000000003
[   18.989548][  T260] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   18.989550][  T260] R10: 00007f71996a8510 R11: 0000000000000246 R12: 0000000000000001
[   18.989554][  T260] R13: 00000000690df2eb R14: 0000000000499600 R15: 0000000000000000
| [   19.030461][  T260] refcount_t: underflow; use-after-free.
| [   19.030705][  T260] WARNING: CPU: 2 PID: 260 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   19.031064][  T260] Modules linked in:
| [   19.031564][  T260] Tainted: [B]=BAD_PAGE
[   19.031719][  T260] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.031995][  T260] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   19.032234][  T260] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 85 9a e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
All code
========
   0:	cc                   	int3
   1:	38 03                	cmp    %al,(%rbx)
   3:	80 fb 01             	cmp    $0x1,%bl
   6:	0f 87 29 33 d7 fe    	ja     0xfffffffffed73335
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 17 cc 38 03 01 	movb   $0x1,0x338cc17(%rip)        # 0x338cc33
  1c:	90                   	nop
  1d:	48 c7 c7 40 ba 85 9a 	mov    $0xffffffff9a85ba40,%rdi
  24:	e8 62 d6 16 ff       	call   0xffffffffff16d68b
  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 c0 9d a0 ff       	call   0xffffffffffa09dfb
  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 c0 9d a0 ff       	call   0xffffffffffa09dd1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   19.032827][  T260] RSP: 0018:ffffc90000b471f0 EFLAGS: 00010286
[   19.033085][  T260] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   19.033347][  T260] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   19.033612][  T260] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3700934
[   19.033885][  T260] R10: 0000000000000003 R11: ffffc90000b46d80 R12: 0000000000000001
[   19.034175][  T260] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   19.034434][  T260] FS:  00007f71995de800(0000) GS:ffff8880ca008000(0000) knlGS:0000000000000000
[   19.034744][  T260] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.035001][  T260] CR2: 00000000004a00a4 CR3: 00000000062b5001 CR4: 0000000000772ef0
[   19.035268][  T260] PKRU: 55555554
[   19.035410][  T260] Call Trace:
[   19.035552][  T260]  <TASK>
[   19.035657][  T260]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   19.035852][  T260]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   19.036074][  T260]  ? generic_xdp_install (net/core/dev.c:11630)
[   19.036259][  T260]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   19.036438][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.036623][  T260]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   19.036850][  T260]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.037121][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.037312][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.037500][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.037681][  T260]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   19.037866][  T260]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.038073][  T260]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.038386][  T260]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   19.038566][  T260]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.038788][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.039028][  T260]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   19.039307][  T260]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.039486][  T260]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   19.039667][  T260]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   19.039848][  T260]  ? 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)
[   19.040059][  T260]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   19.040238][  T260]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   19.040423][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.040602][  T260]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   19.040887][  T260]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.041091][  T260]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   19.041271][  T260]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.041452][  T260]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   19.041724][  T260]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   19.041992][  T260]  ? __copy_msghdr (net/socket.c:2556)
[   19.042184][  T260]  ___sys_sendmsg (net/socket.c:2686)
[   19.042364][  T260]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   19.042636][  T260]  ? __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)
[   19.042853][  T260]  ? copy_msghdr_from_user (net/socket.c:2673)
[   19.043077][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.043257][  T260]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.043528][  T260]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.043751][  T260]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   19.043967][  T260]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.044169][  T260]  __sys_sendmsg (net/socket.c:2716)
[   19.044490][  T260]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   19.044735][  T260]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   19.044972][  T260]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   19.045251][  T260]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   19.045431][  T260]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   19.045654][  T260] RIP: 0033:0x7f71997ac1d7
[   19.045846][  T260] 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)
[   19.046487][  T260] RSP: 002b:00007ffdbb4ec828 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   19.046848][  T260] RAX: ffffffffffffffda RBX: 00007ffdbb4ecf60 RCX: 00007f71997ac1d7
[   19.047148][  T260] RDX: 0000000000000000 RSI: 00007ffdbb4ec890 RDI: 0000000000000003
[   19.047423][  T260] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   19.047787][  T260] R10: 00007f71996a8510 R11: 0000000000000246 R12: 0000000000000001


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