======================================
| [   27.484221][  T297] ==================================================================
| [   27.484556][  T297] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   27.484836][  T297] Read of size 1 at addr ffff888008bfa69c by task ip/297
| [   27.485149][  T297]
[   27.485271][  T297] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   27.485275][  T297] Call Trace:
[   27.485277][  T297]  <TASK>
[   27.485279][  T297]  dump_stack_lvl (lib/dump_stack.c:123)
[   27.485287][  T297]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   27.485294][  T297]  ? kobject_put (lib/kobject.c:733)
[   27.485299][  T297]  print_report (mm/kasan/report.c:483)
[   27.485302][  T297]  ? kobject_put (lib/kobject.c:733)
[   27.485304][  T297]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   27.485307][  T297]  ? kobject_put (lib/kobject.c:733)
[   27.485310][  T297]  kasan_report (mm/kasan/report.c:597)
[   27.485313][  T297]  ? kobject_put (lib/kobject.c:733)
[   27.485318][  T297]  kobject_put (lib/kobject.c:733)
[   27.485321][  T297]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   27.485327][  T297]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   27.485331][  T297]  ? generic_xdp_install (net/core/dev.c:11630)
[   27.485334][  T297]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   27.485338][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.485346][  T297]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   27.485352][  T297]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   27.485371][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.485375][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.485381][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.485385][  T297]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   27.485387][  T297]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   27.485392][  T297]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   27.485395][  T297]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   27.485399][  T297]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   27.485402][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.485409][  T297]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   27.485413][  T297]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   27.485417][  T297]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   27.485423][  T297]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   27.485430][  T297]  ? 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)
[   27.485437][  T297]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   27.485444][  T297]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   27.485451][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.485460][  T297]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   27.485468][  T297]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   27.485473][  T297]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   27.485486][  T297]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   27.485491][  T297]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   27.485501][  T297]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   27.485507][  T297]  ? __copy_msghdr (net/socket.c:2556)
[   27.485519][  T297]  ___sys_sendmsg (net/socket.c:2686)
[   27.485523][  T297]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   27.485528][  T297]  ? __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)
[   27.485539][  T297]  ? copy_msghdr_from_user (net/socket.c:2673)
[   27.485546][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.485553][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.485561][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.485565][  T297]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   27.485570][  T297]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   27.485577][  T297]  __sys_sendmsg (net/socket.c:2716)
[   27.485579][  T297]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   27.485583][  T297]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   27.485590][  T297]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   27.485595][  T297]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   27.485600][  T297]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   27.485605][  T297] RIP: 0033:0x7fb4dac8a1d7
[   27.485612][  T297] 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)
[   27.485615][  T297] RSP: 002b:00007ffc10030d28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   27.485619][  T297] RAX: ffffffffffffffda RBX: 00007ffc10031460 RCX: 00007fb4dac8a1d7
[   27.485622][  T297] RDX: 0000000000000000 RSI: 00007ffc10030d90 RDI: 0000000000000005
[   27.485624][  T297] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   27.485625][  T297] R10: 00007fb4dab86510 R11: 0000000000000246 R12: 0000000000000001
[   27.485627][  T297] R13: 00000000690df27b R14: 0000000000499600 R15: 0000000000000000
| [   27.526732][  T297] refcount_t: underflow; use-after-free.
| [   27.526983][  T297] WARNING: CPU: 3 PID: 297 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   27.527991][  T297] Modules linked in:
| [   27.528601][  T297] Tainted: [B]=BAD_PAGE
[   27.528800][  T297] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   27.529030][  T297] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   27.529313][  T297] 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 65 93 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 65 93 	mov    $0xffffffff9365a860,%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
[   27.530016][  T297] RSP: 0018:ffffc90000e171f0 EFLAGS: 00010286
[   27.530247][  T297] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   27.530539][  T297] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   27.530837][  T297] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff27fe134
[   27.531161][  T297] R10: 0000000000000003 R11: ffffc90000e16d80 R12: 0000000000000001
[   27.531489][  T297] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   27.531771][  T297] FS:  00007fb4daabc800(0000) GS:ffff88809b101000(0000) knlGS:0000000000000000
[   27.532225][  T297] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   27.532469][  T297] CR2: 00000000004e5840 CR3: 000000000a0a0004 CR4: 0000000000772ef0
[   27.532770][  T297] PKRU: 55555554
[   27.532915][  T297] Call Trace:
[   27.533091][  T297]  <TASK>
[   27.533180][  T297]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   27.533370][  T297]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   27.533571][  T297]  ? generic_xdp_install (net/core/dev.c:11630)
[   27.533767][  T297]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   27.533949][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.534155][  T297]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   27.534332][  T297]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   27.534613][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.534838][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.535035][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.535246][  T297]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   27.535464][  T297]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   27.535631][  T297]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   27.535908][  T297]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   27.536090][  T297]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   27.536294][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.536505][  T297]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   27.536666][  T297]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   27.537051][  T297]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   27.537234][  T297]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   27.537457][  T297]  ? 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)
[   27.537636][  T297]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   27.537939][  T297]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   27.538107][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.538296][  T297]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   27.538456][  T297]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   27.538769][  T297]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   27.539029][  T297]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   27.539215][  T297]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   27.539553][  T297]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   27.539770][  T297]  ? __copy_msghdr (net/socket.c:2556)
[   27.540001][  T297]  ___sys_sendmsg (net/socket.c:2686)
[   27.540207][  T297]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   27.540527][  T297]  ? __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)
[   27.540784][  T297]  ? copy_msghdr_from_user (net/socket.c:2673)
[   27.541000][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.541184][  T297]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   27.541396][  T297]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   27.541573][  T297]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   27.541734][  T297]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   27.541986][  T297]  __sys_sendmsg (net/socket.c:2716)
[   27.542289][  T297]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   27.542507][  T297]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   27.542681][  T297]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   27.542852][  T297]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   27.543105][  T297]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   27.543326][  T297] RIP: 0033:0x7fb4dac8a1d7
[   27.543500][  T297] 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)
[   27.544121][  T297] RSP: 002b:00007ffc10030d28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   27.544547][  T297] RAX: ffffffffffffffda RBX: 00007ffc10031460 RCX: 00007fb4dac8a1d7
[   27.544803][  T297] RDX: 0000000000000000 RSI: 00007ffc10030d90 RDI: 0000000000000005
[   27.545078][  T297] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   27.545327][  T297] R10: 00007fb4dab86510 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