======================================
| [   64.524934][  T493] ==================================================================
| [   64.525270][  T493] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   64.525576][  T493] Read of size 1 at addr ffff88800b4446c4 by task ip/493
| [   64.525798][  T493]
[   64.525923][  T493] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   64.525929][  T493] Call Trace:
[   64.525933][  T493]  <TASK>
[   64.525935][  T493]  dump_stack_lvl (lib/dump_stack.c:123)
[   64.525941][  T493]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   64.525959][  T493]  ? kobject_put (lib/kobject.c:733)
[   64.525963][  T493]  print_report (mm/kasan/report.c:483)
[   64.525967][  T493]  ? kobject_put (lib/kobject.c:733)
[   64.525972][  T493]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   64.525976][  T493]  ? kobject_put (lib/kobject.c:733)
[   64.525979][  T493]  kasan_report (mm/kasan/report.c:597)
[   64.525983][  T493]  ? kobject_put (lib/kobject.c:733)
[   64.525988][  T493]  kobject_put (lib/kobject.c:733)
[   64.525992][  T493]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   64.526004][  T493]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   64.526008][  T493]  ? generic_xdp_install (net/core/dev.c:11630)
[   64.526013][  T493]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   64.526020][  T493]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   64.526028][  T493]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   64.526047][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.526066][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.526071][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.526075][  T493]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   64.526078][  T493]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   64.526082][  T493]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   64.526086][  T493]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   64.526090][  T493]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   64.526094][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.526100][  T493]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   64.526106][  T493]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   64.526110][  T493]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   64.526116][  T493]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   64.526118][  T493]  ? 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)
[   64.526123][  T493]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   64.526127][  T493]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   64.526131][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.526135][  T493]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   64.526139][  T493]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   64.526142][  T493]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   64.526158][  T493]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   64.526162][  T493]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   64.526168][  T493]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   64.526170][  T493]  ? __copy_msghdr (net/socket.c:2556)
[   64.526178][  T493]  ___sys_sendmsg (net/socket.c:2686)
[   64.526180][  T493]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   64.526184][  T493]  ? __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)
[   64.526192][  T493]  ? copy_msghdr_from_user (net/socket.c:2673)
[   64.526197][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.526201][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.526206][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.526210][  T493]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   64.526228][  T493]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   64.526234][  T493]  __sys_sendmsg (net/socket.c:2716)
[   64.526236][  T493]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   64.526239][  T493]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   64.526246][  T493]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   64.526255][  T493]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   64.526263][  T493]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   64.526274][  T493] RIP: 0033:0x7fd753ab41d7
[   64.526281][  T493] 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)
[   64.526285][  T493] RSP: 002b:00007ffd74556d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   64.526294][  T493] RAX: ffffffffffffffda RBX: 00007ffd745574c0 RCX: 00007fd753ab41d7
[   64.526297][  T493] RDX: 0000000000000000 RSI: 00007ffd74556df0 RDI: 0000000000000005
[   64.526299][  T493] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   64.526301][  T493] R10: 00007fd7539b0510 R11: 0000000000000246 R12: 0000000000000001
[   64.526303][  T493] R13: 00000000690df37e R14: 0000000000499600 R15: 0000000000000000
| [   64.555698][  T493] refcount_t: underflow; use-after-free.
| [   64.556024][  T493] WARNING: CPU: 2 PID: 493 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   64.556395][  T493] Modules linked in: xt_length nft_compat nf_tables act_ct nf_flow_table nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 cls_flower sch_ingress
| [   64.557331][  T493] Tainted: [B]=BAD_PAGE
[   64.557476][  T493] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   64.557737][  T493] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   64.558054][  T493] 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 45 9c 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 45 9c 	mov    $0xffffffff9c45ba40,%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
[   64.558712][  T493] RSP: 0018:ffffc90000cb71f0 EFLAGS: 00010286
[   64.558959][  T493] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   64.559266][  T493] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   64.559535][  T493] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3a80934
[   64.559829][  T493] R10: 0000000000000003 R11: ffffc90000cb6d80 R12: 0000000000000001
[   64.560129][  T493] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   64.560413][  T493] FS:  00007fd7538e6800(0000) GS:ffff8880c8408000(0000) knlGS:0000000000000000
[   64.560725][  T493] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   64.560978][  T493] CR2: 0000564c93371d18 CR3: 000000000aa3a003 CR4: 0000000000772ef0
[   64.561376][  T493] PKRU: 55555554
[   64.561524][  T493] Call Trace:
[   64.561700][  T493]  <TASK>
[   64.561807][  T493]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   64.562016][  T493]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   64.562334][  T493]  ? generic_xdp_install (net/core/dev.c:11630)
[   64.562530][  T493]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   64.562744][  T493]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   64.562950][  T493]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   64.563311][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.563499][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.563694][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.564008][  T493]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   64.564202][  T493]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   64.564423][  T493]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   64.564660][  T493]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   64.564975][  T493]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   64.565176][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.565382][  T493]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   64.565577][  T493]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   64.565761][  T493]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   64.565965][  T493]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   64.566167][  T493]  ? 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)
[   64.566367][  T493]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   64.566560][  T493]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   64.566738][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.566941][  T493]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   64.567142][  T493]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   64.567345][  T493]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   64.567529][  T493]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   64.567721][  T493]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   64.567935][  T493]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   64.568172][  T493]  ? __copy_msghdr (net/socket.c:2556)
[   64.568417][  T493]  ___sys_sendmsg (net/socket.c:2686)
[   64.568606][  T493]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   64.568789][  T493]  ? __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)
[   64.569033][  T493]  ? copy_msghdr_from_user (net/socket.c:2673)
[   64.569232][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.569437][  T493]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   64.569632][  T493]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   64.569811][  T493]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   64.570010][  T493]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   64.570212][  T493]  __sys_sendmsg (net/socket.c:2716)
[   64.570422][  T493]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   64.570654][  T493]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   64.570843][  T493]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   64.571033][  T493]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   64.571233][  T493]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   64.571465][  T493] RIP: 0033:0x7fd753ab41d7
[   64.571672][  T493] 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)
[   64.572314][  T493] RSP: 002b:00007ffd74556d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   64.572601][  T493] RAX: ffffffffffffffda RBX: 00007ffd745574c0 RCX: 00007fd753ab41d7
[   64.572880][  T493] RDX: 0000000000000000 RSI: 00007ffd74556df0 RDI: 0000000000000005
[   64.573175][  T493] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   64.573453][  T493] R10: 00007fd7539b0510 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