======================================
| xx__-> [   32.152588][  T376] ==================================================================
| [   32.152898][  T376] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   32.153156][  T376] Read of size 1 at addr ffff8880075446ac by task ip/376
| [   32.153363][  T376]
[   32.153468][  T376] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.153470][  T376] Call Trace:
[   32.153472][  T376]  <TASK>
[   32.153474][  T376]  dump_stack_lvl (lib/dump_stack.c:123)
[   32.153480][  T376]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   32.153486][  T376]  ? kobject_put (lib/kobject.c:733)
[   32.153490][  T376]  print_report (mm/kasan/report.c:483)
[   32.153493][  T376]  ? kobject_put (lib/kobject.c:733)
[   32.153496][  T376]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   32.153499][  T376]  ? kobject_put (lib/kobject.c:733)
[   32.153502][  T376]  kasan_report (mm/kasan/report.c:597)
[   32.153506][  T376]  ? kobject_put (lib/kobject.c:733)
[   32.153511][  T376]  kobject_put (lib/kobject.c:733)
[   32.153514][  T376]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   32.153519][  T376]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   32.153522][  T376]  ? generic_xdp_install (net/core/dev.c:11630)
[   32.153526][  T376]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   32.153533][  T376]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   32.153537][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.153545][  T376]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   32.153550][  T376]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   32.153569][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.153573][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.153579][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.153583][  T376]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   32.153585][  T376]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   32.153590][  T376]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   32.153593][  T376]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   32.153597][  T376]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   32.153599][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.153606][  T376]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   32.153610][  T376]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   32.153614][  T376]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   32.153620][  T376]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   32.153623][  T376]  ? 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)
[   32.153627][  T376]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   32.153631][  T376]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   32.153634][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.153640][  T376]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   32.153644][  T376]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   32.153648][  T376]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   32.153653][  T376]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   32.153657][  T376]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   32.153662][  T376]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   32.153665][  T376]  ? __copy_msghdr (net/socket.c:2556)
[   32.153673][  T376]  ___sys_sendmsg (net/socket.c:2686)
[   32.153677][  T376]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   32.153680][  T376]  ? __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)
[   32.153686][  T376]  ? copy_msghdr_from_user (net/socket.c:2673)
[   32.153691][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.153695][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.153701][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.153704][  T376]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   32.153709][  T376]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   32.153715][  T376]  __sys_sendmsg (net/socket.c:2716)
[   32.153718][  T376]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   32.153722][  T376]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   32.153729][  T376]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   32.153733][  T376]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   32.153738][  T376]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   32.153742][  T376] RIP: 0033:0x7fbd219da1d7
[   32.153746][  T376] 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)
[   32.153749][  T376] RSP: 002b:00007ffc7c6d9168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   32.153753][  T376] RAX: ffffffffffffffda RBX: 00007ffc7c6d9890 RCX: 00007fbd219da1d7
[   32.153755][  T376] RDX: 0000000000000000 RSI: 00007ffc7c6d91d0 RDI: 0000000000000005
[   32.153757][  T376] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   32.153758][  T376] R10: 00007fbd218d6f60 R11: 0000000000000246 R12: 0000000000000002
[   32.153760][  T376] R13: 00000000690dfb24 R14: 0000000000499600 R15: 0000000000000000
| [   32.180462][  T376] refcount_t: underflow; use-after-free.
| [   32.180685][  T376] WARNING: CPU: 0 PID: 376 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   32.181065][  T376] Modules linked in: sch_ingress vrf veth
| [   32.181696][  T376] Tainted: [B]=BAD_PAGE
[   32.181868][  T376] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.182134][  T376] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   32.182414][  T376] 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 b4 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 b4 	mov    $0xffffffffb4a58d60,%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
[   32.183151][  T376] RSP: 0000:ffffc900009e71f0 EFLAGS: 00010286
[   32.183416][  T376] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   32.183732][  T376] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   32.184048][  T376] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6a7e134
[   32.184355][  T376] R10: 0000000000000003 R11: ffffc900009e6d80 R12: 0000000000000001
[   32.184662][  T376] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   32.184984][  T376] FS:  00007fbd2180c800(0000) GS:ffff888079df2000(0000) knlGS:0000000000000000
[   32.185339][  T376] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.185598][  T376] CR2: 00007fbd21ae9f88 CR3: 000000000b9ec004 CR4: 0000000000772ef0
[   32.185934][  T376] PKRU: 55555554
[   32.186128][  T376] Call Trace:
[   32.186289][  T376]  <TASK>
[   32.186394][  T376]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   32.186611][  T376]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   32.186816][  T376]  ? generic_xdp_install (net/core/dev.c:11630)
[   32.187046][  T376]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[   32.187258][  T376]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[   32.187519][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.187725][  T376]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   32.187942][  T376]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   32.188225][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.188428][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.188631][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.188847][  T376]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   32.189055][  T376]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   32.189273][  T376]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   32.189522][  T376]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   32.189735][  T376]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   32.189937][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.190154][  T376]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   32.190355][  T376]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   32.190565][  T376]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   32.190769][  T376]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   32.190988][  T376]  ? 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)
[   32.191196][  T376]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   32.191397][  T376]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   32.191596][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.191799][  T376]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   32.192009][  T376]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   32.192210][  T376]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   32.192415][  T376]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   32.192619][  T376]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   32.192827][  T376]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   32.193085][  T376]  ? __copy_msghdr (net/socket.c:2556)
[   32.193290][  T376]  ___sys_sendmsg (net/socket.c:2686)
[   32.193492][  T376]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   32.193701][  T376]  ? __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)
[   32.193961][  T376]  ? copy_msghdr_from_user (net/socket.c:2673)
[   32.194167][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.194378][  T376]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.194582][  T376]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.194784][  T376]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   32.195094][  T376]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   32.195298][  T376]  __sys_sendmsg (net/socket.c:2716)
[   32.195500][  T376]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   32.195752][  T376]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   32.196063][  T376]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   32.196267][  T376]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   32.196471][  T376]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   32.196816][  T376] RIP: 0033:0x7fbd219da1d7
[   32.197036][  T376] 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)
[   32.197858][  T376] RSP: 002b:00007ffc7c6d9168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   32.198191][  T376] RAX: ffffffffffffffda RBX: 00007ffc7c6d9890 RCX: 00007fbd219da1d7
[   32.198504][  T376] RDX: 0000000000000000 RSI: 00007ffc7c6d91d0 RDI: 0000000000000005
[   32.198919][  T376] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   32.199237][  T376] R10: 00007fbd218d6f60 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