======================================
| [   25.152859][  T343] ==================================================================
| [   25.153241][  T343] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   25.153513][  T343] Read of size 1 at addr ffff88800aa296c4 by task ip/343
| [   25.153728][  T343]
[   25.153834][  T343] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.153836][  T343] Call Trace:
[   25.153838][  T343]  <TASK>
[   25.153840][  T343]  dump_stack_lvl (lib/dump_stack.c:123)
[   25.153847][  T343]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   25.153855][  T343]  ? kobject_put (lib/kobject.c:733)
[   25.153859][  T343]  print_report (mm/kasan/report.c:483)
[   25.153862][  T343]  ? kobject_put (lib/kobject.c:733)
[   25.153866][  T343]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   25.153869][  T343]  ? kobject_put (lib/kobject.c:733)
[   25.153872][  T343]  kasan_report (mm/kasan/report.c:597)
[   25.153876][  T343]  ? kobject_put (lib/kobject.c:733)
[   25.153882][  T343]  kobject_put (lib/kobject.c:733)
[   25.153886][  T343]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   25.153893][  T343]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   25.153897][  T343]  ? generic_xdp_install (net/core/dev.c:11630)
[   25.153900][  T343]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   25.153906][  T343]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   25.153914][  T343]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   25.153919][  T343]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.153939][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.153949][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.153954][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.153958][  T343]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   25.153961][  T343]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.153967][  T343]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.153973][  T343]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   25.153979][  T343]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.153984][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.153992][  T343]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   25.153997][  T343]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.154002][  T343]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   25.154008][  T343]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   25.154011][  T343]  ? 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)
[   25.154015][  T343]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   25.154019][  T343]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   25.154022][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.154027][  T343]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   25.154031][  T343]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.154034][  T343]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   25.154040][  T343]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.154044][  T343]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   25.154048][  T343]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   25.154051][  T343]  ? __copy_msghdr (net/socket.c:2556)
[   25.154058][  T343]  ___sys_sendmsg (net/socket.c:2686)
[   25.154061][  T343]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   25.154065][  T343]  ? __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)
[   25.154071][  T343]  ? copy_msghdr_from_user (net/socket.c:2673)
[   25.154075][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.154079][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.154084][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.154088][  T343]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   25.154095][  T343]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.154101][  T343]  __sys_sendmsg (net/socket.c:2716)
[   25.154103][  T343]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   25.154106][  T343]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   25.154113][  T343]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   25.154120][  T343]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   25.154126][  T343]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   25.154131][  T343] RIP: 0033:0x7f20648321d7
[   25.154136][  T343] 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)
[   25.154140][  T343] RSP: 002b:00007ffe93e0a3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.154144][  T343] RAX: ffffffffffffffda RBX: 00007ffe93e0ab20 RCX: 00007f20648321d7
[   25.154146][  T343] RDX: 0000000000000000 RSI: 00007ffe93e0a460 RDI: 0000000000000005
[   25.154148][  T343] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   25.154150][  T343] R10: 00007f206472ef60 R11: 0000000000000246 R12: 0000000000000002
[   25.154152][  T343] R13: 00000000690df686 R14: 0000000000499600 R15: 0000000000000000
| [   25.179608][  T343] refcount_t: underflow; use-after-free.
| [   25.179827][  T343] WARNING: CPU: 1 PID: 343 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   25.180250][  T343] Modules linked in: ip6_gre gre
| [   25.180803][  T343] Tainted: [B]=BAD_PAGE
[   25.180948][  T343] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.181169][  T343] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   25.181396][  T343] 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 a5 ba 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 a5 ba 	mov    $0xffffffffbaa5ba40,%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
[   25.182032][  T343] RSP: 0018:ffffc90000d371f0 EFLAGS: 00010286
[   25.182259][  T343] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   25.182518][  T343] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   25.182796][  T343] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7740934
[   25.183065][  T343] R10: 0000000000000003 R11: ffffc90000d36d80 R12: 0000000000000001
[   25.183327][  T343] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   25.183587][  T343] FS:  00007f2064664800(0000) GS:ffff8880b0188000(0000) knlGS:0000000000000000
[   25.183914][  T343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.184138][  T343] CR2: 00007f8bc14c7600 CR3: 000000000b82f005 CR4: 0000000000772ef0
[   25.184399][  T343] PKRU: 55555554
[   25.184522][  T343] Call Trace:
[   25.184662][  T343]  <TASK>
[   25.184763][  T343]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   25.184963][  T343]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   25.185131][  T343]  ? generic_xdp_install (net/core/dev.c:11630)
[   25.185310][  T343]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   25.185477][  T343]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   25.185664][  T343]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   25.185857][  T343]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.186101][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.186283][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.186447][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.186615][  T343]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   25.186805][  T343]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.186987][  T343]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.187208][  T343]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   25.187373][  T343]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.187542][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.187739][  T343]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   25.187922][  T343]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.188187][  T343]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   25.188360][  T343]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   25.188523][  T343]  ? 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)
[   25.188695][  T343]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   25.188882][  T343]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   25.189066][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.189241][  T343]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   25.189407][  T343]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.189569][  T343]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   25.189743][  T343]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.189935][  T343]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   25.190102][  T343]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   25.190327][  T343]  ? __copy_msghdr (net/socket.c:2556)
[   25.190494][  T343]  ___sys_sendmsg (net/socket.c:2686)
[   25.190664][  T343]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   25.190848][  T343]  ? __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)
[   25.191074][  T343]  ? copy_msghdr_from_user (net/socket.c:2673)
[   25.191245][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.191410][  T343]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.191581][  T343]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.191751][  T343]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   25.191945][  T343]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.192115][  T343]  __sys_sendmsg (net/socket.c:2716)
[   25.192288][  T343]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   25.192514][  T343]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   25.192687][  T343]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   25.192868][  T343]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   25.193057][  T343]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   25.193276][  T343] RIP: 0033:0x7f20648321d7
[   25.193450][  T343] 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)
[   25.194101][  T343] RSP: 002b:00007ffe93e0a3f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.194650][  T343] RAX: ffffffffffffffda RBX: 00007ffe93e0ab20 RCX: 00007f20648321d7
[   25.195037][  T343] RDX: 0000000000000000 RSI: 00007ffe93e0a460 RDI: 0000000000000005
[   25.195418][  T343] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   25.195894][  T343] R10: 00007f206472ef60 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