======================================
| [   58.213942][  T633] ==================================================================
| [   58.214335][  T633] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   58.214663][  T633] Read of size 1 at addr ffff88800ec316ac by task ip/633
| [   58.214910][  T633]
[   58.215023][  T633] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   58.215026][  T633] Call Trace:
[   58.215028][  T633]  <TASK>
[   58.215031][  T633]  dump_stack_lvl (lib/dump_stack.c:123)
[   58.215039][  T633]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   58.215051][  T633]  ? kobject_put (lib/kobject.c:733)
[   58.215055][  T633]  print_report (mm/kasan/report.c:483)
[   58.215058][  T633]  ? kobject_put (lib/kobject.c:733)
[   58.215061][  T633]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   58.215065][  T633]  ? kobject_put (lib/kobject.c:733)
[   58.215068][  T633]  kasan_report (mm/kasan/report.c:597)
[   58.215072][  T633]  ? kobject_put (lib/kobject.c:733)
[   58.215077][  T633]  kobject_put (lib/kobject.c:733)
[   58.215081][  T633]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   58.215086][  T633]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   58.215091][  T633]  ? generic_xdp_install (net/core/dev.c:11630)
[   58.215094][  T633]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   58.215100][  T633]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   58.215108][  T633]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   58.215114][  T633]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   58.215133][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.215142][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.215149][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.215153][  T633]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   58.215156][  T633]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   58.215160][  T633]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   58.215164][  T633]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   58.215167][  T633]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   58.215170][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.215177][  T633]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   58.215183][  T633]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   58.215186][  T633]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   58.215193][  T633]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   58.215196][  T633]  ? 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)
[   58.215200][  T633]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   58.215204][  T633]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   58.215208][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.215215][  T633]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   58.215220][  T633]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   58.215223][  T633]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   58.215230][  T633]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   58.215233][  T633]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   58.215239][  T633]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   58.215242][  T633]  ? __copy_msghdr (net/socket.c:2556)
[   58.215249][  T633]  ___sys_sendmsg (net/socket.c:2686)
[   58.215252][  T633]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   58.215255][  T633]  ? __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)
[   58.215261][  T633]  ? copy_msghdr_from_user (net/socket.c:2673)
[   58.215266][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.215274][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.215282][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.215287][  T633]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   58.215296][  T633]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   58.215302][  T633]  __sys_sendmsg (net/socket.c:2716)
[   58.215305][  T633]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   58.215309][  T633]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   58.215322][  T633]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   58.215327][  T633]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   58.215336][  T633]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   58.215341][  T633] RIP: 0033:0x7fdc24b161d7
[   58.215347][  T633] 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)
[   58.215350][  T633] RSP: 002b:00007ffe49d7af68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   58.215355][  T633] RAX: ffffffffffffffda RBX: 00007ffe49d7b690 RCX: 00007fdc24b161d7
[   58.215357][  T633] RDX: 0000000000000000 RSI: 00007ffe49d7afd0 RDI: 0000000000000005
[   58.215359][  T633] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   58.215361][  T633] R10: 00007fdc24a12f60 R11: 0000000000000246 R12: 0000000000000002
[   58.215363][  T633] R13: 00000000690df828 R14: 0000000000499600 R15: 0000000000000000
| [   58.245863][  T633] refcount_t: underflow; use-after-free.
| [   58.246230][  T633] WARNING: CPU: 2 PID: 633 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   58.246813][  T633] Modules linked in: act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q vrf veth
| [   58.248216][  T633] Tainted: [B]=BAD_PAGE
[   58.248477][  T633] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   58.248898][  T633] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   58.249341][  T633] 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 65 ac 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 65 ac 	mov    $0xffffffffac658d60,%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
[   58.250706][  T633] RSP: 0018:ffffc90000fff1f0 EFLAGS: 00010286
[   58.251131][  T633] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   58.251620][  T633] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   58.252321][  T633] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff59fe134
[   58.252814][  T633] R10: 0000000000000003 R11: ffffc90000ffed80 R12: 0000000000000001
[   58.253321][  T633] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   58.253869][  T633] FS:  00007fdc24948800(0000) GS:ffff888087ef2000(0000) knlGS:0000000000000000
[   58.254460][  T633] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   58.254892][  T633] CR2: 000055f3647c2dec CR3: 00000000054c1002 CR4: 0000000000772ef0
[   58.255411][  T633] PKRU: 55555554
[   58.255668][  T633] Call Trace:
[   58.255935][  T633]  <TASK>
[   58.256141][  T633]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   58.256671][  T633]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   58.257025][  T633]  ? generic_xdp_install (net/core/dev.c:11630)
[   58.257382][  T633]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   58.257722][  T633]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   58.258251][  T633]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   58.258587][  T633]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   58.259014][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.259372][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.259903][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.260265][  T633]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   58.260586][  T633]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   58.260904][  T633]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   58.261313][  T633]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   58.261647][  T633]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   58.261969][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.262339][  T633]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   58.262676][  T633]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   58.263018][  T633]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   58.263373][  T633]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   58.263728][  T633]  ? 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)
[   58.264058][  T633]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   58.264404][  T633]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   58.264744][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.265052][  T633]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   58.265583][  T633]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   58.265891][  T633]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   58.266222][  T633]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   58.266548][  T633]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   58.267062][  T633]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   58.267473][  T633]  ? __copy_msghdr (net/socket.c:2556)
[   58.267829][  T633]  ___sys_sendmsg (net/socket.c:2686)
[   58.268357][  T633]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   58.268693][  T633]  ? __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)
[   58.269108][  T633]  ? copy_msghdr_from_user (net/socket.c:2673)
[   58.269440][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.269911][  T633]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   58.270256][  T633]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   58.270593][  T633]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   58.270933][  T633]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   58.271454][  T633]  __sys_sendmsg (net/socket.c:2716)
[   58.271784][  T633]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   58.272189][  T633]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   58.272522][  T633]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   58.273029][  T633]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   58.273375][  T633]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   58.273802][  T633] RIP: 0033:0x7fdc24b161d7
[   58.274158][  T633] 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)
[   58.275462][  T633] RSP: 002b:00007ffe49d7af68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   58.276132][  T633] RAX: ffffffffffffffda RBX: 00007ffe49d7b690 RCX: 00007fdc24b161d7
[   58.276625][  T633] RDX: 0000000000000000 RSI: 00007ffe49d7afd0 RDI: 0000000000000005
[   58.277109][  T633] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   58.277781][  T633] R10: 00007fdc24a12f60 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