======================================
| xx__-> [   17.845237][  T272] ==================================================================
| [   17.845626][  T272] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   17.845914][  T272] Read of size 1 at addr ffff88800e2f46c4 by task ip/272
| [   17.846117][  T272]
[   17.846233][  T272] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.846236][  T272] Call Trace:
[   17.846238][  T272]  <TASK>
[   17.846240][  T272]  dump_stack_lvl (lib/dump_stack.c:123)
[   17.846247][  T272]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   17.846255][  T272]  ? kobject_put (lib/kobject.c:733)
[   17.846259][  T272]  print_report (mm/kasan/report.c:483)
[   17.846263][  T272]  ? kobject_put (lib/kobject.c:733)
[   17.846266][  T272]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   17.846269][  T272]  ? kobject_put (lib/kobject.c:733)
[   17.846272][  T272]  kasan_report (mm/kasan/report.c:597)
[   17.846276][  T272]  ? kobject_put (lib/kobject.c:733)
[   17.846282][  T272]  kobject_put (lib/kobject.c:733)
[   17.846285][  T272]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   17.846292][  T272]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   17.846296][  T272]  ? generic_xdp_install (net/core/dev.c:11630)
[   17.846299][  T272]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   17.846306][  T272]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   17.846311][  T272]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   17.846330][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.846339][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.846345][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.846349][  T272]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   17.846352][  T272]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   17.846356][  T272]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   17.846359][  T272]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   17.846363][  T272]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   17.846367][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.846373][  T272]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   17.846378][  T272]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   17.846382][  T272]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   17.846389][  T272]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   17.846391][  T272]  ? 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)
[   17.846395][  T272]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   17.846399][  T272]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   17.846404][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.846411][  T272]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   17.846418][  T272]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   17.846423][  T272]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   17.846431][  T272]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   17.846436][  T272]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   17.846444][  T272]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   17.846448][  T272]  ? __copy_msghdr (net/socket.c:2556)
[   17.846462][  T272]  ___sys_sendmsg (net/socket.c:2686)
[   17.846467][  T272]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   17.846473][  T272]  ? __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)
[   17.846481][  T272]  ? copy_msghdr_from_user (net/socket.c:2673)
[   17.846489][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.846497][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.846507][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.846514][  T272]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   17.846523][  T272]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   17.846534][  T272]  __sys_sendmsg (net/socket.c:2716)
[   17.846538][  T272]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   17.846543][  T272]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   17.846557][  T272]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   17.846567][  T272]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   17.846576][  T272]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   17.846583][  T272] RIP: 0033:0x7f6f70fde1d7
[   17.846590][  T272] 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)
[   17.846595][  T272] RSP: 002b:00007fffed578778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   17.846602][  T272] RAX: ffffffffffffffda RBX: 00007fffed578eb0 RCX: 00007f6f70fde1d7
[   17.846605][  T272] RDX: 0000000000000000 RSI: 00007fffed5787e0 RDI: 0000000000000005
[   17.846608][  T272] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   17.846611][  T272] R10: 00007f6f70eda510 R11: 0000000000000246 R12: 0000000000000001
[   17.846614][  T272] R13: 00000000690dfa4a R14: 0000000000499600 R15: 0000000000000000
| [   17.877756][  T272] refcount_t: underflow; use-after-free.
| [   17.877961][  T272] WARNING: CPU: 3 PID: 272 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   17.878259][  T272] Modules linked in:
| [   17.878798][  T272] Tainted: [B]=BAD_PAGE
[   17.878939][  T272] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.879153][  T272] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   17.879385][  T272] 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 05 92 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 05 92 	mov    $0xffffffff9205ba40,%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
[   17.880049][  T272] RSP: 0018:ffffc90000c671f0 EFLAGS: 00010286
[   17.880262][  T272] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   17.880554][  T272] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   17.880833][  T272] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2600934
[   17.881096][  T272] R10: 0000000000000003 R11: ffffc90000c66d80 R12: 0000000000000001
[   17.881353][  T272] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   17.881644][  T272] FS:  00007f6f70e10800(0000) GS:ffff8880d8c88000(0000) knlGS:0000000000000000
[   17.881942][  T272] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.882165][  T272] CR2: 00007f1e21639c08 CR3: 000000000e08c002 CR4: 0000000000772ef0
[   17.882440][  T272] PKRU: 55555554
[   17.882589][  T272] Call Trace:
[   17.882734][  T272]  <TASK>
[   17.882817][  T272]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   17.883008][  T272]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   17.883186][  T272]  ? generic_xdp_install (net/core/dev.c:11630)
[   17.883364][  T272]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   17.883584][  T272]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   17.883780][  T272]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   17.884002][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.884185][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.884358][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.884551][  T272]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   17.884746][  T272]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   17.884909][  T272]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   17.885128][  T272]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   17.885297][  T272]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   17.885487][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.885679][  T272]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   17.885858][  T272]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   17.886030][  T272]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   17.886230][  T272]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   17.886414][  T272]  ? 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)
[   17.886618][  T272]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   17.886800][  T272]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   17.886965][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.887127][  T272]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   17.887303][  T272]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   17.887621][  T272]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   17.887802][  T272]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   17.887966][  T272]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   17.888127][  T272]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   17.888351][  T272]  ? __copy_msghdr (net/socket.c:2556)
[   17.888550][  T272]  ___sys_sendmsg (net/socket.c:2686)
[   17.888745][  T272]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   17.888911][  T272]  ? __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)
[   17.889116][  T272]  ? copy_msghdr_from_user (net/socket.c:2673)
[   17.889303][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.889502][  T272]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   17.889693][  T272]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   17.889866][  T272]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   17.890037][  T272]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   17.890201][  T272]  __sys_sendmsg (net/socket.c:2716)
[   17.890385][  T272]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   17.890634][  T272]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   17.890812][  T272]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   17.890982][  T272]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   17.891144][  T272]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   17.891356][  T272] RIP: 0033:0x7f6f70fde1d7
[   17.891560][  T272] 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)
[   17.892167][  T272] RSP: 002b:00007fffed578778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   17.892466][  T272] RAX: ffffffffffffffda RBX: 00007fffed578eb0 RCX: 00007f6f70fde1d7
[   17.892755][  T272] RDX: 0000000000000000 RSI: 00007fffed5787e0 RDI: 0000000000000005
[   17.893030][  T272] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   17.893281][  T272] R10: 00007f6f70eda510 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