======================================
| [  257.115879][ T1640] ==================================================================
| [  257.116312][ T1640] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  257.116679][ T1640] Read of size 1 at addr ffff88800ab4a6ac by task ip/1640
| [  257.116979][ T1640]
[  257.117122][ T1640] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  257.117125][ T1640] Call Trace:
[  257.117130][ T1640]  <TASK>
[  257.117133][ T1640]  dump_stack_lvl (lib/dump_stack.c:123)
[  257.117141][ T1640]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  257.117151][ T1640]  ? kobject_put (lib/kobject.c:733)
[  257.117156][ T1640]  print_report (mm/kasan/report.c:483)
[  257.117161][ T1640]  ? kobject_put (lib/kobject.c:733)
[  257.117165][ T1640]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  257.117170][ T1640]  ? kobject_put (lib/kobject.c:733)
[  257.117174][ T1640]  kasan_report (mm/kasan/report.c:597)
[  257.117179][ T1640]  ? kobject_put (lib/kobject.c:733)
[  257.117188][ T1640]  kobject_put (lib/kobject.c:733)
[  257.117193][ T1640]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  257.117202][ T1640]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  257.117207][ T1640]  ? generic_xdp_install (net/core/dev.c:11630)
[  257.117211][ T1640]  ? 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)
[  257.117222][ T1640]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  257.117230][ T1640]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  257.117288][ T1640]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  257.117298][ T1640]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  257.117330][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.117344][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.117353][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.117358][ T1640]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  257.117362][ T1640]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  257.117369][ T1640]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  257.117373][ T1640]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  257.117400][ T1640]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  257.117405][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.117416][ T1640]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  257.117422][ T1640]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  257.117427][ T1640]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  257.117438][ T1640]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  257.117442][ T1640]  ? 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)
[  257.117449][ T1640]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  257.117455][ T1640]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  257.117461][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.117470][ T1640]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  257.117477][ T1640]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  257.117482][ T1640]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  257.117495][ T1640]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  257.117501][ T1640]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  257.117509][ T1640]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  257.117514][ T1640]  ? __copy_msghdr (net/socket.c:2556)
[  257.117528][ T1640]  ___sys_sendmsg (net/socket.c:2686)
[  257.117533][ T1640]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  257.117537][ T1640]  ? __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)
[  257.117548][ T1640]  ? copy_msghdr_from_user (net/socket.c:2673)
[  257.117556][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.117563][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.117572][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.117577][ T1640]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  257.117584][ T1640]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  257.117594][ T1640]  __sys_sendmsg (net/socket.c:2716)
[  257.117598][ T1640]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  257.117604][ T1640]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  257.117616][ T1640]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  257.117622][ T1640]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  257.117630][ T1640]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  257.117635][ T1640] RIP: 0033:0x7fd21b9121d7
[  257.117644][ T1640] 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)
[  257.117648][ T1640] RSP: 002b:00007ffe806504e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  257.117656][ T1640] RAX: ffffffffffffffda RBX: 00007ffe80650c10 RCX: 00007fd21b9121d7
[  257.117660][ T1640] RDX: 0000000000000000 RSI: 00007ffe80650550 RDI: 0000000000000005
[  257.117662][ T1640] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  257.117665][ T1640] R10: 00007fd21b80ef60 R11: 0000000000000246 R12: 0000000000000002
[  257.117668][ T1640] R13: 00000000690df336 R14: 0000000000499600 R15: 0000000000000000
| [  257.158245][ T1640] refcount_t: underflow; use-after-free.
| [  257.158456][ T1640] WARNING: CPU: 0 PID: 1640 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  257.158755][ T1640] Modules linked in: act_gact cls_flower sch_ingress bridge stp llc vrf veth
| [  257.159419][ T1640] Tainted: [B]=BAD_PAGE
[  257.159555][ T1640] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  257.159766][ T1640] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  257.159976][ T1640] 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 45 87 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 45 87 	mov    $0xffffffff87458d60,%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
[  257.160586][ T1640] RSP: 0018:ffffc90003d871f0 EFLAGS: 00010286
[  257.160805][ T1640] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  257.161049][ T1640] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  257.161308][ T1640] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0fbe134
[  257.161554][ T1640] R10: 0000000000000003 R11: ffffc90003d86d80 R12: 0000000000000001
[  257.161905][ T1640] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  257.162165][ T1640] FS:  00007fd21b744800(0000) GS:ffff8880acff2000(0000) knlGS:0000000000000000
[  257.162483][ T1640] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  257.162708][ T1640] CR2: 0000556e600dec38 CR3: 0000000008aa1004 CR4: 0000000000772ef0
[  257.162973][ T1640] PKRU: 55555554
[  257.163109][ T1640] Call Trace:
[  257.163352][ T1640]  <TASK>
[  257.163535][ T1640]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  257.163707][ T1640]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  257.163878][ T1640]  ? generic_xdp_install (net/core/dev.c:11630)
[  257.164142][ T1640]  ? 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)
[  257.164420][ T1640]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  257.164584][ T1640]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  257.164788][ T1640]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  257.164951][ T1640]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  257.165287][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.165453][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.165616][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.165778][ T1640]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  257.166135][ T1640]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  257.166299][ T1640]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  257.166499][ T1640]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  257.166665][ T1640]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  257.166920][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.167086][ T1640]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  257.167261][ T1640]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  257.167438][ T1640]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  257.167693][ T1640]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  257.167852][ T1640]  ? 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)
[  257.168013][ T1640]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  257.168296][ T1640]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  257.168465][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.168628][ T1640]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  257.168788][ T1640]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  257.168949][ T1640]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  257.169222][ T1640]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  257.169382][ T1640]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  257.169550][ T1640]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  257.169850][ T1640]  ? __copy_msghdr (net/socket.c:2556)
[  257.170015][ T1640]  ___sys_sendmsg (net/socket.c:2686)
[  257.170196][ T1640]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  257.170363][ T1640]  ? __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)
[  257.170665][ T1640]  ? copy_msghdr_from_user (net/socket.c:2673)
[  257.170829][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.170993][ T1640]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  257.171173][ T1640]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  257.171434][ T1640]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  257.171599][ T1640]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  257.171763][ T1640]  __sys_sendmsg (net/socket.c:2716)
[  257.171924][ T1640]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  257.172230][ T1640]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  257.172398][ T1640]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  257.172559][ T1640]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  257.172725][ T1640]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  257.173026][ T1640] RIP: 0033:0x7fd21b9121d7
[  257.173212][ T1640] 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)
[  257.173894][ T1640] RSP: 002b:00007ffe806504e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  257.174166][ T1640] RAX: ffffffffffffffda RBX: 00007ffe80650c10 RCX: 00007fd21b9121d7
[  257.174510][ T1640] RDX: 0000000000000000 RSI: 00007ffe80650550 RDI: 0000000000000005
[  257.174757][ T1640] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  257.175002][ T1640] R10: 00007fd21b80ef60 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