======================================
| [   61.560503][  T506] ==================================================================
| [   61.560936][  T506] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   61.561349][  T506] Read of size 1 at addr ffff88800eff26ac by task ip/506
| [   61.561699][  T506]
[   61.561848][  T506] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   61.561851][  T506] Call Trace:
[   61.561853][  T506]  <TASK>
[   61.561856][  T506]  dump_stack_lvl (lib/dump_stack.c:123)
[   61.561863][  T506]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   61.561871][  T506]  ? kobject_put (lib/kobject.c:733)
[   61.561876][  T506]  print_report (mm/kasan/report.c:483)
[   61.561880][  T506]  ? kobject_put (lib/kobject.c:733)
[   61.561883][  T506]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   61.561888][  T506]  ? kobject_put (lib/kobject.c:733)
[   61.561894][  T506]  kasan_report (mm/kasan/report.c:597)
[   61.561899][  T506]  ? kobject_put (lib/kobject.c:733)
[   61.561908][  T506]  kobject_put (lib/kobject.c:733)
[   61.561914][  T506]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   61.561920][  T506]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   61.561926][  T506]  ? generic_xdp_install (net/core/dev.c:11630)
[   61.561930][  T506]  ? 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)
[   61.561938][  T506]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   61.561947][  T506]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   61.561995][  T506]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   61.562001][  T506]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   61.562028][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.562035][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.562044][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.562050][  T506]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   61.562054][  T506]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   61.562062][  T506]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   61.562067][  T506]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   61.562074][  T506]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   61.562079][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.562091][  T506]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   61.562099][  T506]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   61.562105][  T506]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   61.562116][  T506]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   61.562119][  T506]  ? 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)
[   61.562125][  T506]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   61.562133][  T506]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   61.562140][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.562149][  T506]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   61.562157][  T506]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   61.562164][  T506]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   61.562173][  T506]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   61.562179][  T506]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   61.562186][  T506]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   61.562190][  T506]  ? __copy_msghdr (net/socket.c:2556)
[   61.562200][  T506]  ___sys_sendmsg (net/socket.c:2686)
[   61.562204][  T506]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   61.562208][  T506]  ? __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)
[   61.562216][  T506]  ? copy_msghdr_from_user (net/socket.c:2673)
[   61.562223][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.562229][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.562236][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.562241][  T506]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   61.562248][  T506]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   61.562256][  T506]  __sys_sendmsg (net/socket.c:2716)
[   61.562261][  T506]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   61.562267][  T506]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   61.562278][  T506]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   61.562284][  T506]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   61.562292][  T506]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   61.562298][  T506] RIP: 0033:0x7f648aca11d7
[   61.562305][  T506] 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)
[   61.562309][  T506] RSP: 002b:00007fff8c6ece68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   61.562316][  T506] RAX: ffffffffffffffda RBX: 00007fff8c6ed590 RCX: 00007f648aca11d7
[   61.562320][  T506] RDX: 0000000000000000 RSI: 00007fff8c6eced0 RDI: 0000000000000005
[   61.562323][  T506] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   61.562325][  T506] R10: 00007f648ab9df60 R11: 0000000000000246 R12: 0000000000000002
[   61.562328][  T506] R13: 00000000690ded86 R14: 0000000000499600 R15: 0000000000000000
| [   61.608268][  T506] refcount_t: underflow; use-after-free.
| [   61.608551][  T506] WARNING: CPU: 2 PID: 506 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   61.609933][  T506] Modules linked in: bridge stp llc 8021q vrf veth
| [   61.610820][  T506] Tainted: [B]=BAD_PAGE
[   61.611014][  T506] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   61.611341][  T506] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   61.611707][  T506] 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 05 9e 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 05 9e 	mov    $0xffffffff9e058d60,%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
[   61.612575][  T506] RSP: 0018:ffffc90000ce71f0 EFLAGS: 00010286
[   61.612932][  T506] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   61.613350][  T506] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   61.613766][  T506] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3d3e134
[   61.614144][  T506] R10: 0000000000000003 R11: ffffc90000ce6d80 R12: 0000000000000001
[   61.614511][  T506] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   61.614902][  T506] FS:  00007f648aad3800(0000) GS:ffff8880964f2000(0000) knlGS:0000000000000000
[   61.615519][  T506] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   61.615849][  T506] CR2: 00007f657dc10248 CR3: 0000000008c45002 CR4: 0000000000772ef0
[   61.616257][  T506] PKRU: 55555554
[   61.616639][  T506] Call Trace:
[   61.616851][  T506]  <TASK>
[   61.616991][  T506]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   61.617260][  T506]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   61.617506][  T506]  ? generic_xdp_install (net/core/dev.c:11630)
[   61.617781][  T506]  ? 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)
[   61.618040][  T506]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   61.618350][  T506]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   61.618666][  T506]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   61.619073][  T506]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   61.619427][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.619732][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.620007][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.620410][  T506]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   61.620694][  T506]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   61.620976][  T506]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   61.621307][  T506]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   61.621560][  T506]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   61.621858][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.622151][  T506]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   61.622415][  T506]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   61.622689][  T506]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   61.622948][  T506]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   61.623224][  T506]  ? 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)
[   61.623651][  T506]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   61.623926][  T506]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   61.624170][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.624457][  T506]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   61.624783][  T506]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   61.625046][  T506]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   61.625305][  T506]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   61.625547][  T506]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   61.625982][  T506]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   61.626316][  T506]  ? __copy_msghdr (net/socket.c:2556)
[   61.626637][  T506]  ___sys_sendmsg (net/socket.c:2686)
[   61.626872][  T506]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   61.627402][  T506]  ? __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)
[   61.627718][  T506]  ? copy_msghdr_from_user (net/socket.c:2673)
[   61.627965][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.628400][  T506]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   61.628656][  T506]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   61.629027][  T506]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   61.629320][  T506]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   61.629603][  T506]  __sys_sendmsg (net/socket.c:2716)
[   61.630013][  T506]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   61.630333][  T506]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   61.630783][  T506]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   61.631035][  T506]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   61.631317][  T506]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   61.631643][  T506] RIP: 0033:0x7f648aca11d7
[   61.631904][  T506] 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)
[   61.632919][  T506] RSP: 002b:00007fff8c6ece68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   61.633442][  T506] RAX: ffffffffffffffda RBX: 00007fff8c6ed590 RCX: 00007f648aca11d7
[   61.633948][  T506] RDX: 0000000000000000 RSI: 00007fff8c6eced0 RDI: 0000000000000005
[   61.634470][  T506] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   61.634862][  T506] R10: 00007f648ab9df60 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