======================================
| [  478.202155][ T2002] ==================================================================
| [  478.202501][ T2002] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  478.202873][ T2002] Read of size 1 at addr ffff88800555a6ac by task ip/2002
| [  478.203118][ T2002]
[  478.203264][ T2002] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  478.203271][ T2002] Call Trace:
[  478.203274][ T2002]  <TASK>
[  478.203276][ T2002]  dump_stack_lvl (lib/dump_stack.c:123)
[  478.203287][ T2002]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  478.203295][ T2002]  ? kobject_put (lib/kobject.c:733)
[  478.203299][ T2002]  print_report (mm/kasan/report.c:483)
[  478.203302][ T2002]  ? kobject_put (lib/kobject.c:733)
[  478.203305][ T2002]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  478.203309][ T2002]  ? kobject_put (lib/kobject.c:733)
[  478.203312][ T2002]  kasan_report (mm/kasan/report.c:597)
[  478.203316][ T2002]  ? kobject_put (lib/kobject.c:733)
[  478.203321][ T2002]  kobject_put (lib/kobject.c:733)
[  478.203325][ T2002]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  478.203329][ T2002]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  478.203332][ T2002]  ? generic_xdp_install (net/core/dev.c:11630)
[  478.203335][ T2002]  ? 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)
[  478.203340][ T2002]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  478.203346][ T2002]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  478.203385][ T2002]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  478.203390][ T2002]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  478.203420][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.203428][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.203437][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.203443][ T2002]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  478.203446][ T2002]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  478.203451][ T2002]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  478.203454][ T2002]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  478.203458][ T2002]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  478.203461][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.203468][ T2002]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  478.203472][ T2002]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  478.203476][ T2002]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  478.203483][ T2002]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  478.203486][ T2002]  ? 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)
[  478.203489][ T2002]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  478.203494][ T2002]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  478.203498][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.203503][ T2002]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  478.203508][ T2002]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  478.203512][ T2002]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  478.203520][ T2002]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  478.203527][ T2002]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  478.203535][ T2002]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  478.203539][ T2002]  ? __copy_msghdr (net/socket.c:2556)
[  478.203552][ T2002]  ___sys_sendmsg (net/socket.c:2686)
[  478.203556][ T2002]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  478.203559][ T2002]  ? __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)
[  478.203567][ T2002]  ? copy_msghdr_from_user (net/socket.c:2673)
[  478.203572][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.203577][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.203582][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.203586][ T2002]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  478.203592][ T2002]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  478.203598][ T2002]  __sys_sendmsg (net/socket.c:2716)
[  478.203602][ T2002]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  478.203606][ T2002]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  478.203613][ T2002]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  478.203617][ T2002]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  478.203623][ T2002]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  478.203627][ T2002] RIP: 0033:0x7f878814b1d7
[  478.203632][ T2002] 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)
[  478.203635][ T2002] RSP: 002b:00007ffe33c768b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  478.203639][ T2002] RAX: ffffffffffffffda RBX: 00007ffe33c76fe0 RCX: 00007f878814b1d7
[  478.203643][ T2002] RDX: 0000000000000000 RSI: 00007ffe33c76920 RDI: 0000000000000005
[  478.203646][ T2002] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  478.203648][ T2002] R10: 00007f8788047f60 R11: 0000000000000246 R12: 0000000000000002
[  478.203651][ T2002] R13: 00000000690de6bc R14: 0000000000499600 R15: 0000000000000000
| [  478.246230][ T2002] refcount_t: underflow; use-after-free.
| [  478.246520][ T2002] WARNING: CPU: 3 PID: 2002 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  478.247026][ T2002] Modules linked in: em_meta cls_basic sch_ets sch_tbf bridge stp llc 8021q vrf veth
| [  478.247882][ T2002] Tainted: [B]=BAD_PAGE
[  478.248049][ T2002] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  478.248303][ T2002] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  478.248566][ T2002] 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 65 a7 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 65 a7 	mov    $0xffffffffa7658d60,%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
[  478.249325][ T2002] RSP: 0018:ffffc900019471f0 EFLAGS: 00010286
[  478.249542][ T2002] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  478.249856][ T2002] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  478.250248][ T2002] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4ffe134
[  478.250592][ T2002] R10: 0000000000000003 R11: ffffc90001946d80 R12: 0000000000000001
[  478.250906][ T2002] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  478.251246][ T2002] FS:  00007f8787f7d800(0000) GS:ffff888087372000(0000) knlGS:0000000000000000
[  478.251612][ T2002] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  478.251895][ T2002] CR2: 00007f878834b050 CR3: 000000000f984002 CR4: 0000000000772ef0
[  478.252232][ T2002] PKRU: 55555554
[  478.252367][ T2002] Call Trace:
[  478.252545][ T2002]  <TASK>
[  478.252651][ T2002]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  478.252994][ T2002]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  478.253228][ T2002]  ? generic_xdp_install (net/core/dev.c:11630)
[  478.253442][ T2002]  ? 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)
[  478.253646][ T2002]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  478.253981][ T2002]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  478.254214][ T2002]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  478.254419][ T2002]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  478.254683][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.255006][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.255239][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.255438][ T2002]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  478.255641][ T2002]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  478.255979][ T2002]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  478.256237][ T2002]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  478.256437][ T2002]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  478.256731][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.256988][ T2002]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  478.257197][ T2002]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  478.257395][ T2002]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  478.257687][ T2002]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  478.257883][ T2002]  ? 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)
[  478.258087][ T2002]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  478.258300][ T2002]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  478.258564][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.258755][ T2002]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  478.258926][ T2002]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  478.259111][ T2002]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  478.259388][ T2002]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  478.259556][ T2002]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  478.259725][ T2002]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  478.260070][ T2002]  ? __copy_msghdr (net/socket.c:2556)
[  478.260347][ T2002]  ___sys_sendmsg (net/socket.c:2686)
[  478.260516][ T2002]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  478.260676][ T2002]  ? __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)
[  478.260893][ T2002]  ? copy_msghdr_from_user (net/socket.c:2673)
[  478.261075][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.261254][ T2002]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  478.261480][ T2002]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  478.261683][ T2002]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  478.261997][ T2002]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  478.262221][ T2002]  __sys_sendmsg (net/socket.c:2716)
[  478.262426][ T2002]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  478.262680][ T2002]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  478.262993][ T2002]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  478.263219][ T2002]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  478.263385][ T2002]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  478.263691][ T2002] RIP: 0033:0x7f878814b1d7
[  478.263878][ T2002] 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)
[  478.264692][ T2002] RSP: 002b:00007ffe33c768b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  478.265002][ T2002] RAX: ffffffffffffffda RBX: 00007ffe33c76fe0 RCX: 00007f878814b1d7
[  478.265314][ T2002] RDX: 0000000000000000 RSI: 00007ffe33c76920 RDI: 0000000000000005
[  478.265711][ T2002] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  478.266019][ T2002] R10: 00007f8788047f60 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