======================================
| [   43.635404][  T423] ==================================================================
| [   43.635876][  T423] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   43.636343][  T423] Read of size 1 at addr ffff888004fa26ac by task ip/423
| [   43.636724][  T423]
[   43.636889][  T423] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.636892][  T423] Call Trace:
[   43.636896][  T423]  <TASK>
[   43.636899][  T423]  dump_stack_lvl (lib/dump_stack.c:123)
[   43.636907][  T423]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   43.636916][  T423]  ? kobject_put (lib/kobject.c:733)
[   43.636922][  T423]  print_report (mm/kasan/report.c:483)
[   43.636928][  T423]  ? kobject_put (lib/kobject.c:733)
[   43.636933][  T423]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   43.636938][  T423]  ? kobject_put (lib/kobject.c:733)
[   43.636943][  T423]  kasan_report (mm/kasan/report.c:597)
[   43.636950][  T423]  ? kobject_put (lib/kobject.c:733)
[   43.636959][  T423]  kobject_put (lib/kobject.c:733)
[   43.636964][  T423]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   43.636973][  T423]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   43.636978][  T423]  ? generic_xdp_install (net/core/dev.c:11630)
[   43.636982][  T423]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   43.636992][  T423]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   43.637000][  T423]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   43.637057][  T423]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   43.637065][  T423]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.637100][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.637112][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.637124][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.637130][  T423]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   43.637133][  T423]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.637140][  T423]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.637146][  T423]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   43.637153][  T423]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.637159][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.637170][  T423]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   43.637177][  T423]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.637183][  T423]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   43.637196][  T423]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   43.637201][  T423]  ? 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)
[   43.637208][  T423]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   43.637216][  T423]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   43.637223][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.637232][  T423]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   43.637241][  T423]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.637247][  T423]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   43.637258][  T423]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.637265][  T423]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   43.637273][  T423]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   43.637278][  T423]  ? __copy_msghdr (net/socket.c:2556)
[   43.637291][  T423]  ___sys_sendmsg (net/socket.c:2686)
[   43.637296][  T423]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   43.637300][  T423]  ? __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)
[   43.637313][  T423]  ? copy_msghdr_from_user (net/socket.c:2673)
[   43.637321][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.637329][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.637339][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.637345][  T423]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   43.637358][  T423]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.637370][  T423]  __sys_sendmsg (net/socket.c:2716)
[   43.637375][  T423]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   43.637381][  T423]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   43.637396][  T423]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   43.637403][  T423]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   43.637411][  T423]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   43.637416][  T423] RIP: 0033:0x7fab5c7b21d7
[   43.637423][  T423] 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)
[   43.637427][  T423] RSP: 002b:00007ffe513023d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   43.637433][  T423] RAX: ffffffffffffffda RBX: 00007ffe51302b00 RCX: 00007fab5c7b21d7
[   43.637437][  T423] RDX: 0000000000000000 RSI: 00007ffe51302440 RDI: 0000000000000005
[   43.637440][  T423] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   43.637443][  T423] R10: 00007fab5c6aef60 R11: 0000000000000246 R12: 0000000000000002
[   43.637446][  T423] R13: 00000000690df9bf R14: 0000000000499600 R15: 0000000000000000
| [   43.694777][  T423] refcount_t: underflow; use-after-free.
| [   43.695085][  T423] WARNING: CPU: 3 PID: 423 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   43.695432][  T423] Modules linked in: act_gact cls_flower sch_ingress bridge stp llc vrf veth
| [   43.696422][  T423] Tainted: [B]=BAD_PAGE
[   43.696574][  T423] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.696875][  T423] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   43.697237][  T423] 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 93 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 93 	mov    $0xffffffff93258d60,%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
[   43.698033][  T423] RSP: 0018:ffffc900007471f0 EFLAGS: 00010286
[   43.698299][  T423] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   43.698590][  T423] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   43.698982][  T423] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff277e134
[   43.699280][  T423] R10: 0000000000000003 R11: ffffc90000746d80 R12: 0000000000000001
[   43.699576][  T423] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   43.699983][  T423] FS:  00007fab5c5e4800(0000) GS:ffff88809b772000(0000) knlGS:0000000000000000
[   43.700320][  T423] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   43.700569][  T423] CR2: 00000000004e5ae8 CR3: 0000000005145002 CR4: 0000000000772ef0
[   43.701073][  T423] PKRU: 55555554
[   43.701224][  T423] Call Trace:
[   43.701368][  T423]  <TASK>
[   43.701466][  T423]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   43.701777][  T423]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   43.701970][  T423]  ? generic_xdp_install (net/core/dev.c:11630)
[   43.702157][  T423]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   43.702349][  T423]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   43.702538][  T423]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   43.702759][  T423]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   43.702947][  T423]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.703269][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.703469][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.703681][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.703994][  T423]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   43.704256][  T423]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.704448][  T423]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   43.704709][  T423]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   43.704901][  T423]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.705085][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.705442][  T423]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   43.705661][  T423]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   43.705856][  T423]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   43.706048][  T423]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   43.706304][  T423]  ? 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)
[   43.706496][  T423]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   43.706701][  T423]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   43.706890][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.707078][  T423]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   43.707440][  T423]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.707634][  T423]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   43.707850][  T423]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   43.708038][  T423]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   43.708291][  T423]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   43.708533][  T423]  ? __copy_msghdr (net/socket.c:2556)
[   43.708745][  T423]  ___sys_sendmsg (net/socket.c:2686)
[   43.708934][  T423]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   43.709200][  T423]  ? __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)
[   43.709428][  T423]  ? copy_msghdr_from_user (net/socket.c:2673)
[   43.709625][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.709817][  T423]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   43.710006][  T423]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   43.710260][  T423]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   43.710451][  T423]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   43.710643][  T423]  __sys_sendmsg (net/socket.c:2716)
[   43.710835][  T423]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   43.711061][  T423]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   43.711316][  T423]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   43.711506][  T423]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   43.711711][  T423]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   43.711937][  T423] RIP: 0033:0x7fab5c7b21d7
[   43.712205][  T423] 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)
[   43.713066][  T423] RSP: 002b:00007ffe513023d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   43.713530][  T423] RAX: ffffffffffffffda RBX: 00007ffe51302b00 RCX: 00007fab5c7b21d7
[   43.713824][  T423] RDX: 0000000000000000 RSI: 00007ffe51302440 RDI: 0000000000000005
[   43.714089][  T423] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   43.714433][  T423] R10: 00007fab5c6aef60 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