======================================
| [   60.785770][  T663] ==================================================================
| [   60.786093][  T663] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   60.786394][  T663] Read of size 1 at addr ffff88800ec346ac by task ip/663
| [   60.786618][  T663]
[   60.786728][  T663] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   60.786737][  T663] Call Trace:
[   60.786740][  T663]  <TASK>
[   60.786742][  T663]  dump_stack_lvl (lib/dump_stack.c:123)
[   60.786750][  T663]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   60.786764][  T663]  ? kobject_put (lib/kobject.c:733)
[   60.786768][  T663]  print_report (mm/kasan/report.c:483)
[   60.786771][  T663]  ? kobject_put (lib/kobject.c:733)
[   60.786774][  T663]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   60.786777][  T663]  ? kobject_put (lib/kobject.c:733)
[   60.786780][  T663]  kasan_report (mm/kasan/report.c:597)
[   60.786784][  T663]  ? kobject_put (lib/kobject.c:733)
[   60.786789][  T663]  kobject_put (lib/kobject.c:733)
[   60.786793][  T663]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   60.786802][  T663]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   60.786805][  T663]  ? generic_xdp_install (net/core/dev.c:11630)
[   60.786808][  T663]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   60.786813][  T663]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   60.786822][  T663]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   60.786829][  T663]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.786848][  T663]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.786858][  T663]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.786869][  T663]  ? irqentry_exit (kernel/entry/common.c:215)
[   60.786877][  T663]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   60.786881][  T663]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.786886][  T663]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.786889][  T663]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   60.786893][  T663]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.786896][  T663]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.786904][  T663]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   60.786910][  T663]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.786913][  T663]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   60.786920][  T663]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   60.786923][  T663]  ? 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)
[   60.786927][  T663]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   60.786931][  T663]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   60.786935][  T663]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.786940][  T663]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   60.786945][  T663]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.786948][  T663]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   60.786963][  T663]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.786966][  T663]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   60.786977][  T663]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   60.786980][  T663]  ? __copy_msghdr (net/socket.c:2556)
[   60.786989][  T663]  ___sys_sendmsg (net/socket.c:2686)
[   60.786992][  T663]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   60.786995][  T663]  ? __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)
[   60.786999][  T663]  ? copy_msghdr_from_user (net/socket.c:2673)
[   60.787004][  T663]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.787008][  T663]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.787014][  T663]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.787017][  T663]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   60.787030][  T663]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.787037][  T663]  __sys_sendmsg (net/socket.c:2716)
[   60.787040][  T663]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   60.787044][  T663]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   60.787051][  T663]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.787055][  T663]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   60.787060][  T663]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   60.787068][  T663] RIP: 0033:0x7f2b1b0d11d7
[   60.787072][  T663] 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)
[   60.787075][  T663] RSP: 002b:00007ffdeec202f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   60.787081][  T663] RAX: ffffffffffffffda RBX: 00007ffdeec20a20 RCX: 00007f2b1b0d11d7
[   60.787083][  T663] RDX: 0000000000000000 RSI: 00007ffdeec20360 RDI: 0000000000000005
[   60.787085][  T663] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   60.787087][  T663] R10: 00007f2b1afcdf60 R11: 0000000000000246 R12: 0000000000000002
[   60.787088][  T663] R13: 00000000690df829 R14: 0000000000499600 R15: 0000000000000000
| [   60.815333][  T663] refcount_t: underflow; use-after-free.
| [   60.815713][  T663] WARNING: CPU: 0 PID: 663 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   60.816241][  T663] Modules linked in: act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q dummy vrf veth
| [   60.817647][  T663] Tainted: [B]=BAD_PAGE
[   60.817889][  T663] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   60.818264][  T663] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   60.818648][  T663] 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 a5 bc 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 a5 bc 	mov    $0xffffffffbca58d60,%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
[   60.819712][  T663] RSP: 0018:ffffc9000103f1f0 EFLAGS: 00010286
[   60.820100][  T663] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   60.820524][  T663] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   60.820946][  T663] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7a7e134
[   60.821383][  T663] R10: 0000000000000003 R11: ffffc9000103ed80 R12: 0000000000000001
[   60.821999][  T663] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   60.822415][  T663] FS:  00007f2b1af03800(0000) GS:ffff8880779f2000(0000) knlGS:0000000000000000
[   60.822925][  T663] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.823467][  T663] CR2: 000055c0b7f61dec CR3: 000000000df78004 CR4: 0000000000772ef0
[   60.823888][  T663] PKRU: 55555554
[   60.824103][  T663] Call Trace:
[   60.824312][  T663]  <TASK>
[   60.824459][  T663]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   60.824743][  T663]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   60.825024][  T663]  ? generic_xdp_install (net/core/dev.c:11630)
[   60.825288][  T663]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   60.825561][  T663]  ? net_generic (./include/net/netns/generic.h:51) ip6_gre
[   60.825844][  T663]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   60.826116][  T663]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.826482][  T663]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.826954][  T663]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.827234][  T663]  ? irqentry_exit (kernel/entry/common.c:215)
[   60.827535][  T663]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   60.827817][  T663]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.828330][  T663]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   60.828666][  T663]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   60.828949][  T663]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.829250][  T663]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.829723][  T663]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   60.830016][  T663]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   60.830299][  T663]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   60.830584][  T663]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   60.831066][  T663]  ? 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)
[   60.831351][  T663]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   60.831641][  T663]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   60.831943][  T663]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.832407][  T663]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   60.832682][  T663]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.832958][  T663]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   60.833228][  T663]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   60.833672][  T663]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   60.833951][  T663]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   60.834283][  T663]  ? __copy_msghdr (net/socket.c:2556)
[   60.834562][  T663]  ___sys_sendmsg (net/socket.c:2686)
[   60.835027][  T663]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   60.835290][  T663]  ? __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)
[   60.835621][  T663]  ? copy_msghdr_from_user (net/socket.c:2673)
[   60.836071][  T663]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.836346][  T663]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   60.836614][  T663]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   60.836886][  T663]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   60.837346][  T663]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   60.837624][  T663]  __sys_sendmsg (net/socket.c:2716)
[   60.837905][  T663]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   60.838257][  T663]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   60.838741][  T663]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   60.839013][  T663]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   60.839284][  T663]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   60.839629][  T663] RIP: 0033:0x7f2b1b0d11d7
[   60.839934][  T663] 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)
[   60.841105][  T663] RSP: 002b:00007ffdeec202f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   60.841532][  T663] RAX: ffffffffffffffda RBX: 00007ffdeec20a20 RCX: 00007f2b1b0d11d7
[   60.841950][  T663] RDX: 0000000000000000 RSI: 00007ffdeec20360 RDI: 0000000000000005
[   60.842524][  T663] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   60.842930][  T663] R10: 00007f2b1afcdf60 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