======================================
| [   60.248937][  T656] ==================================================================
| [   60.249270][  T656] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   60.249584][  T656] Read of size 1 at addr ffff88800cb746ac by task ip/656
| [   60.249819][  T656]
[   60.249924][  T656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   60.249929][  T656] Call Trace:
[   60.249932][  T656]  <TASK>
[   60.249934][  T656]  dump_stack_lvl (lib/dump_stack.c:123)
[   60.249941][  T656]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   60.249949][  T656]  ? kobject_put (lib/kobject.c:733)
[   60.249953][  T656]  print_report (mm/kasan/report.c:483)
[   60.249956][  T656]  ? kobject_put (lib/kobject.c:733)
[   60.249959][  T656]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   60.249962][  T656]  ? kobject_put (lib/kobject.c:733)
[   60.249965][  T656]  kasan_report (mm/kasan/report.c:597)
[   60.249969][  T656]  ? kobject_put (lib/kobject.c:733)
[   60.249975][  T656]  kobject_put (lib/kobject.c:733)
[   60.249978][  T656]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   60.249983][  T656]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   60.249986][  T656]  ? generic_xdp_install (net/core/dev.c:11630)
[   60.249990][  T656]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   60.249997][  T656]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   60.250005][  T656]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   60.250011][  T656]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.250030][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.250037][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.250045][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.250048][  T656]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   60.250051][  T656]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.250056][  T656]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.250059][  T656]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   60.250063][  T656]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.250066][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.250073][  T656]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   60.250078][  T656]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.250082][  T656]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   60.250088][  T656]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   60.250091][  T656]  ? 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)
[   60.250095][  T656]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   60.250099][  T656]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   60.250103][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.250108][  T656]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   60.250113][  T656]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.250116][  T656]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   60.250125][  T656]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.250129][  T656]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   60.250134][  T656]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   60.250137][  T656]  ? __copy_msghdr (net/socket.c:2556)
[   60.250144][  T656]  ___sys_sendmsg (net/socket.c:2686)
[   60.250147][  T656]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   60.250150][  T656]  ? __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)
[   60.250156][  T656]  ? copy_msghdr_from_user (net/socket.c:2673)
[   60.250161][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.250165][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.250171][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.250174][  T656]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   60.250183][  T656]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.250190][  T656]  __sys_sendmsg (net/socket.c:2716)
[   60.250193][  T656]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   60.250197][  T656]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   60.250205][  T656]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.250209][  T656]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   60.250215][  T656]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   60.250220][  T656] RIP: 0033:0x7f7c59f2c1d7
[   60.250225][  T656] 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)
[   60.250228][  T656] RSP: 002b:00007ffdaf809df8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   60.250232][  T656] RAX: ffffffffffffffda RBX: 00007ffdaf80a520 RCX: 00007f7c59f2c1d7
[   60.250235][  T656] RDX: 0000000000000000 RSI: 00007ffdaf809e60 RDI: 0000000000000005
[   60.250236][  T656] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   60.250238][  T656] R10: 00007f7c59e28f60 R11: 0000000000000246 R12: 0000000000000002
[   60.250240][  T656] R13: 00000000690df818 R14: 0000000000499600 R15: 0000000000000000
| [   60.281410][  T656] refcount_t: underflow; use-after-free.
| [   60.282664][  T656] WARNING: CPU: 3 PID: 656 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   60.283178][  T656] Modules linked in: act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q dummy vrf veth
| [   60.284303][  T656] Tainted: [B]=BAD_PAGE
[   60.284507][  T656] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   60.284879][  T656] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   60.285245][  T656] 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 25 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 25 a5 	mov    $0xffffffffa5258d60,%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
[   60.286241][  T656] RSP: 0018:ffffc900010571f0 EFLAGS: 00010286
[   60.286611][  T656] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   60.287014][  T656] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   60.287420][  T656] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4b7e134
[   60.288002][  T656] R10: 0000000000000003 R11: ffffc90001056d80 R12: 0000000000000001
[   60.288412][  T656] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   60.288937][  T656] FS:  00007f7c59d5e800(0000) GS:ffff88808f372000(0000) knlGS:0000000000000000
[   60.289407][  T656] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.289886][  T656] CR2: 00000000004e7430 CR3: 000000000a8e3006 CR4: 0000000000772ef0
[   60.290261][  T656] PKRU: 55555554
[   60.290438][  T656] Call Trace:
[   60.290730][  T656]  <TASK>
[   60.290871][  T656]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   60.291148][  T656]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   60.291386][  T656]  ? generic_xdp_install (net/core/dev.c:11630)
[   60.291797][  T656]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   60.292062][  T656]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   60.292327][  T656]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   60.292722][  T656]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.293066][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.293334][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.293716][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.293971][  T656]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   60.294228][  T656]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.294491][  T656]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.294962][  T656]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   60.295240][  T656]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.295496][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.295870][  T656]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   60.296140][  T656]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.296392][  T656]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   60.296787][  T656]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   60.297037][  T656]  ? 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)
[   60.297275][  T656]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   60.297529][  T656]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   60.297879][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.298147][  T656]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   60.298397][  T656]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.298802][  T656]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   60.299066][  T656]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.299331][  T656]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   60.299760][  T656]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   60.300097][  T656]  ? __copy_msghdr (net/socket.c:2556)
[   60.300347][  T656]  ___sys_sendmsg (net/socket.c:2686)
[   60.300729][  T656]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   60.301011][  T656]  ? __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)
[   60.301360][  T656]  ? copy_msghdr_from_user (net/socket.c:2673)
[   60.301761][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.302038][  T656]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.302311][  T656]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.302578][  T656]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   60.302972][  T656]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.303243][  T656]  __sys_sendmsg (net/socket.c:2716)
[   60.303520][  T656]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   60.303982][  T656]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   60.304254][  T656]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.304512][  T656]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   60.304897][  T656]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   60.305153][  T656] RIP: 0033:0x7f7c59f2c1d7
[   60.305327][  T656] 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)
[   60.305993][  T656] RSP: 002b:00007ffdaf809df8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   60.306238][  T656] RAX: ffffffffffffffda RBX: 00007ffdaf80a520 RCX: 00007f7c59f2c1d7
[   60.306488][  T656] RDX: 0000000000000000 RSI: 00007ffdaf809e60 RDI: 0000000000000005
[   60.306908][  T656] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   60.307146][  T656] R10: 00007f7c59e28f60 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