======================================
| [   43.355062][  T422] ==================================================================
| [   43.355565][  T422] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   43.356038][  T422] Read of size 1 at addr ffff88800e0c96ac by task ip/422
| [   43.356416][  T422]
[   43.356595][  T422] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.356598][  T422] Call Trace:
[   43.356602][  T422]  <TASK>
[   43.356604][  T422]  dump_stack_lvl (lib/dump_stack.c:123)
[   43.356615][  T422]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   43.356633][  T422]  ? kobject_put (lib/kobject.c:733)
[   43.356640][  T422]  print_report (mm/kasan/report.c:483)
[   43.356646][  T422]  ? kobject_put (lib/kobject.c:733)
[   43.356651][  T422]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   43.356656][  T422]  ? kobject_put (lib/kobject.c:733)
[   43.356661][  T422]  kasan_report (mm/kasan/report.c:597)
[   43.356668][  T422]  ? kobject_put (lib/kobject.c:733)
[   43.356677][  T422]  kobject_put (lib/kobject.c:733)
[   43.356683][  T422]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   43.356692][  T422]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   43.356696][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   43.356703][  T422]  ? generic_xdp_install (net/core/dev.c:11630)
[   43.356710][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   43.356718][  T422]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   43.356726][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.356761][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.356771][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.356782][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.356789][  T422]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   43.356793][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.356801][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.356807][  T422]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   43.356814][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.356819][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.356833][  T422]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   43.356841][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.356848][  T422]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   43.356861][  T422]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   43.356866][  T422]  ? 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)
[   43.356873][  T422]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   43.356881][  T422]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   43.356888][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.356898][  T422]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   43.356907][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.356913][  T422]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   43.356926][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.356932][  T422]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   43.356940][  T422]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   43.356946][  T422]  ? __copy_msghdr (net/socket.c:2556)
[   43.356959][  T422]  ___sys_sendmsg (net/socket.c:2686)
[   43.356964][  T422]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   43.356969][  T422]  ? __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)
[   43.356979][  T422]  ? copy_msghdr_from_user (net/socket.c:2673)
[   43.356988][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.356996][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.357006][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.357011][  T422]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   43.357024][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.357036][  T422]  __sys_sendmsg (net/socket.c:2716)
[   43.357041][  T422]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   43.357048][  T422]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   43.357062][  T422]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   43.357070][  T422]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   43.357078][  T422]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   43.357085][  T422] RIP: 0033:0x7fa9834571d7
[   43.357092][  T422] 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)
[   43.357097][  T422] RSP: 002b:00007ffcd2c14598 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   43.357104][  T422] RAX: ffffffffffffffda RBX: 00007ffcd2c14cc0 RCX: 00007fa9834571d7
[   43.357108][  T422] RDX: 0000000000000000 RSI: 00007ffcd2c14600 RDI: 0000000000000005
[   43.357111][  T422] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   43.357114][  T422] R10: 00007fa983353f60 R11: 0000000000000246 R12: 0000000000000002
[   43.357117][  T422] R13: 00000000690def17 R14: 0000000000499600 R15: 0000000000000000
| [   43.408031][  T422] refcount_t: underflow; use-after-free.
| [   43.409267][  T422] WARNING: CPU: 0 PID: 422 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   43.409810][  T422] Modules linked in: bridge stp llc 8021q vrf veth
| [   43.410850][  T422] Tainted: [B]=BAD_PAGE
[   43.411075][  T422] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.411463][  T422] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   43.411841][  T422] 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 e5 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 e5 b4 	mov    $0xffffffffb4e58d60,%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
[   43.412967][  T422] RSP: 0018:ffffc900009671f0 EFLAGS: 00010286
[   43.413369][  T422] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   43.413831][  T422] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   43.414327][  T422] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6afe134
[   43.414803][  T422] R10: 0000000000000003 R11: ffffc90000966d80 R12: 0000000000000001
[   43.415279][  T422] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   43.415737][  T422] FS:  00007fa983289800(0000) GS:ffff88807f5f2000(0000) knlGS:0000000000000000
[   43.416364][  T422] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   43.416780][  T422] CR2: 00000000004e6668 CR3: 000000000a53a002 CR4: 0000000000772ef0
[   43.417245][  T422] PKRU: 55555554
[   43.417465][  T422] Call Trace:
[   43.417701][  T422]  <TASK>
[   43.418034][  T422]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   43.418349][  T422]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   43.418670][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   43.418971][  T422]  ? generic_xdp_install (net/core/dev.c:11630)
[   43.419281][  T422]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   43.419594][  T422]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   43.419889][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.420303][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.420612][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.420941][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.421251][  T422]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   43.421555][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.422020][  T422]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.422396][  T422]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   43.422694][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.422983][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.423301][  T422]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   43.423621][  T422]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.423931][  T422]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   43.424458][  T422]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   43.424756][  T422]  ? 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)
[   43.425049][  T422]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   43.425351][  T422]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   43.425643][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.426158][  T422]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   43.426433][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.426703][  T422]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   43.426985][  T422]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.427499][  T422]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   43.427780][  T422]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   43.428133][  T422]  ? __copy_msghdr (net/socket.c:2556)
[   43.428608][  T422]  ___sys_sendmsg (net/socket.c:2686)
[   43.428893][  T422]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   43.429194][  T422]  ? __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)
[   43.429547][  T422]  ? copy_msghdr_from_user (net/socket.c:2673)
[   43.430005][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.430317][  T422]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.430601][  T422]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.430879][  T422]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   43.431373][  T422]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.431653][  T422]  __sys_sendmsg (net/socket.c:2716)
[   43.431944][  T422]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   43.432331][  T422]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   43.432790][  T422]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   43.433062][  T422]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   43.433359][  T422]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   43.433692][  T422] RIP: 0033:0x7fa9834571d7
[   43.434195][  T422] 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)
[   43.435219][  T422] RSP: 002b:00007ffcd2c14598 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   43.435668][  T422] RAX: ffffffffffffffda RBX: 00007ffcd2c14cc0 RCX: 00007fa9834571d7
[   43.436134][  T422] RDX: 0000000000000000 RSI: 00007ffcd2c14600 RDI: 0000000000000005
[   43.436740][  T422] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   43.437165][  T422] R10: 00007fa983353f60 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