======================================
| [   43.966585][  T441] ==================================================================
| [   43.966936][  T441] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   43.967227][  T441] Read of size 1 at addr ffff888004e796ac by task ip/441
| [   43.967527][  T441]
[   43.967659][  T441] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.967662][  T441] Call Trace:
[   43.967664][  T441]  <TASK>
[   43.967666][  T441]  dump_stack_lvl (lib/dump_stack.c:123)
[   43.967672][  T441]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   43.967680][  T441]  ? kobject_put (lib/kobject.c:733)
[   43.967684][  T441]  print_report (mm/kasan/report.c:483)
[   43.967687][  T441]  ? kobject_put (lib/kobject.c:733)
[   43.967690][  T441]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   43.967694][  T441]  ? kobject_put (lib/kobject.c:733)
[   43.967697][  T441]  kasan_report (mm/kasan/report.c:597)
[   43.967700][  T441]  ? kobject_put (lib/kobject.c:733)
[   43.967706][  T441]  kobject_put (lib/kobject.c:733)
[   43.967710][  T441]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   43.967716][  T441]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   43.967719][  T441]  ? generic_xdp_install (net/core/dev.c:11630)
[   43.967722][  T441]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   43.967725][  T441]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   43.967731][  T441]  ? net_generic (./include/net/netns/generic.h:51)
[   43.967736][  T441]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   43.967742][  T441]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.967761][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.967769][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.967777][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.967781][  T441]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   43.967784][  T441]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.967788][  T441]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.967791][  T441]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   43.967795][  T441]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.967798][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.967805][  T441]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   43.967811][  T441]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.967815][  T441]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   43.967822][  T441]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   43.967825][  T441]  ? 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)
[   43.967829][  T441]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   43.967833][  T441]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   43.967837][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.967842][  T441]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   43.967847][  T441]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.967851][  T441]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   43.967859][  T441]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.967862][  T441]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   43.967868][  T441]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   43.967871][  T441]  ? __copy_msghdr (net/socket.c:2556)
[   43.967878][  T441]  ___sys_sendmsg (net/socket.c:2686)
[   43.967881][  T441]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   43.967884][  T441]  ? __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)
[   43.967890][  T441]  ? copy_msghdr_from_user (net/socket.c:2673)
[   43.967895][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.967899][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.967905][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.967908][  T441]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   43.967913][  T441]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.967919][  T441]  __sys_sendmsg (net/socket.c:2716)
[   43.967923][  T441]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   43.967926][  T441]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   43.967934][  T441]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   43.967938][  T441]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   43.967944][  T441]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   43.967948][  T441] RIP: 0033:0x7f0216d311d7
[   43.967955][  T441] 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)
[   43.967958][  T441] RSP: 002b:00007ffc984ab4f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   43.967962][  T441] RAX: ffffffffffffffda RBX: 00007ffc984abc20 RCX: 00007f0216d311d7
[   43.967965][  T441] RDX: 0000000000000000 RSI: 00007ffc984ab560 RDI: 0000000000000005
[   43.967967][  T441] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   43.967969][  T441] R10: 00007f0216c2df60 R11: 0000000000000246 R12: 0000000000000002
[   43.967971][  T441] R13: 00000000690deeb3 R14: 0000000000499600 R15: 0000000000000000
| [   43.996720][  T441] refcount_t: underflow; use-after-free.
| [   43.997062][  T441] WARNING: CPU: 0 PID: 441 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   43.997686][  T441] Modules linked in: ip_gre gre 8021q dummy vrf veth
| [   43.998714][  T441] Tainted: [B]=BAD_PAGE
[   43.998976][  T441] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.999361][  T441] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   43.999781][  T441] Code: 7d 93 02 80 fb 01 0f 87 bb 99 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 a8 7d 93 02 01 90 48 c7 c7 60 8d 45 a5 e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
All code
========
   0:	7d 93                	jge    0xffffffffffffff95
   2:	02 80 fb 01 0f 87    	add    -0x78f0fe05(%rax),%al
   8:	bb 99 d9 fe 83       	mov    $0x83fed999,%ebx
   d:	e3 01                	jrcxz  0x10
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 a8 7d 93 02 01 	movb   $0x1,0x2937da8(%rip)        # 0x2937dc4
  1c:	90                   	nop
  1d:	48 c7 c7 60 8d 45 a5 	mov    $0xffffffffa5458d60,%rdi
  24:	e8 32 bf 18 ff       	call   0xffffffffff18bf5b
  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 b0 63 a1 ff       	call   0xffffffffffa163eb
  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 b0 63 a1 ff       	call   0xffffffffffa163c1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   44.000885][  T441] RSP: 0018:ffffc90000b971f0 EFLAGS: 00010286
[   44.001290][  T441] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   44.001757][  T441] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   44.002214][  T441] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4bbe134
[   44.002667][  T441] R10: 0000000000000003 R11: ffffc90000b96d80 R12: 0000000000000001
[   44.003153][  T441] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   44.003810][  T441] FS:  00007f0216b63800(0000) GS:ffff88808eff2000(0000) knlGS:0000000000000000
[   44.004323][  T441] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   44.004693][  T441] CR2: 00007fdc10b84000 CR3: 000000000aaf6004 CR4: 0000000000772ef0
[   44.005158][  T441] PKRU: 55555554
[   44.005399][  T441] Call Trace:
[   44.005630][  T441]  <TASK>
[   44.005801][  T441]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   44.006300][  T441]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   44.006785][  T441]  ? generic_xdp_install (net/core/dev.c:11630)
[   44.007075][  T441]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   44.007380][  T441]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   44.007690][  T441]  ? net_generic (./include/net/netns/generic.h:51)
[   44.008020][  T441]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   44.008342][  T441]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   44.008942][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   44.009235][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   44.009718][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   44.010032][  T441]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   44.010340][  T441]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   44.011057][  T441]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   44.011602][  T441]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   44.012133][  T441]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   44.012609][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   44.012940][  T441]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   44.013258][  T441]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   44.013549][  T441]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   44.013873][  T441]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   44.014203][  T441]  ? 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)
[   44.014492][  T441]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   44.014999][  T441]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   44.015287][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   44.015593][  T441]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   44.015898][  T441]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   44.016400][  T441]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   44.016703][  T441]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   44.017005][  T441]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   44.017303][  T441]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   44.017649][  T441]  ? __copy_msghdr (net/socket.c:2556)
[   44.017950][  T441]  ___sys_sendmsg (net/socket.c:2686)
[   44.018419][  T441]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   44.018721][  T441]  ? __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)
[   44.019113][  T441]  ? copy_msghdr_from_user (net/socket.c:2673)
[   44.019418][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   44.019905][  T441]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   44.020193][  T441]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   44.020515][  T441]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   44.020837][  T441]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   44.021317][  T441]  __sys_sendmsg (net/socket.c:2716)
[   44.021623][  T441]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   44.022013][  T441]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   44.022322][  T441]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   44.022795][  T441]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   44.023075][  T441]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   44.023455][  T441] RIP: 0033:0x7f0216d311d7
[   44.023777][  T441] 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)
[   44.024900][  T441] RSP: 002b:00007ffc984ab4f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   44.025554][  T441] RAX: ffffffffffffffda RBX: 00007ffc984abc20 RCX: 00007f0216d311d7
[   44.026055][  T441] RDX: 0000000000000000 RSI: 00007ffc984ab560 RDI: 0000000000000005
[   44.026709][  T441] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   44.027168][  T441] R10: 00007f0216c2df60 R11: 0000000000000246 R12: 0000000000000002


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