======================================
| [   42.417104][  T515] ==================================================================
| [   42.417443][  T515] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   42.417739][  T515] Read of size 1 at addr ffff8880084916ac by task ip/515
| [   42.417952][  T515]
[   42.418050][  T515] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   42.418052][  T515] Call Trace:
[   42.418055][  T515]  <TASK>
[   42.418056][  T515]  dump_stack_lvl (lib/dump_stack.c:123)
[   42.418063][  T515]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   42.418070][  T515]  ? kobject_put (lib/kobject.c:733)
[   42.418074][  T515]  print_report (mm/kasan/report.c:483)
[   42.418077][  T515]  ? kobject_put (lib/kobject.c:733)
[   42.418080][  T515]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   42.418084][  T515]  ? kobject_put (lib/kobject.c:733)
[   42.418087][  T515]  kasan_report (mm/kasan/report.c:597)
[   42.418090][  T515]  ? kobject_put (lib/kobject.c:733)
[   42.418096][  T515]  kobject_put (lib/kobject.c:733)
[   42.418099][  T515]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   42.418105][  T515]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   42.418109][  T515]  ? generic_xdp_install (net/core/dev.c:11630)
[   42.418113][  T515]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   42.418120][  T515]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   42.418126][  T515]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   42.418145][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.418153][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.418160][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.418164][  T515]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   42.418166][  T515]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   42.418171][  T515]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   42.418174][  T515]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   42.418178][  T515]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   42.418181][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.418188][  T515]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   42.418193][  T515]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   42.418197][  T515]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   42.418207][  T515]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   42.418211][  T515]  ? 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)
[   42.418218][  T515]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   42.418224][  T515]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   42.418228][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.418234][  T515]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   42.418238][  T515]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   42.418242][  T515]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   42.418250][  T515]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   42.418253][  T515]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   42.418259][  T515]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   42.418262][  T515]  ? __copy_msghdr (net/socket.c:2556)
[   42.418269][  T515]  ___sys_sendmsg (net/socket.c:2686)
[   42.418272][  T515]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   42.418275][  T515]  ? __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)
[   42.418281][  T515]  ? copy_msghdr_from_user (net/socket.c:2673)
[   42.418286][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.418290][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.418296][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.418300][  T515]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   42.418305][  T515]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   42.418311][  T515]  __sys_sendmsg (net/socket.c:2716)
[   42.418315][  T515]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   42.418318][  T515]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   42.418326][  T515]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   42.418330][  T515]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   42.418335][  T515]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   42.418340][  T515] RIP: 0033:0x7fc34604c1d7
[   42.418346][  T515] 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)
[   42.418349][  T515] RSP: 002b:00007ffc183d0588 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   42.418354][  T515] RAX: ffffffffffffffda RBX: 00007ffc183d0cb0 RCX: 00007fc34604c1d7
[   42.418356][  T515] RDX: 0000000000000000 RSI: 00007ffc183d05f0 RDI: 0000000000000005
[   42.418357][  T515] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   42.418359][  T515] R10: 00007fc345f48f60 R11: 0000000000000246 R12: 0000000000000002
[   42.418360][  T515] R13: 00000000690dfa6d R14: 0000000000499600 R15: 0000000000000000
| [   42.446410][  T515] refcount_t: underflow; use-after-free.
| [   42.446732][  T515] WARNING: CPU: 0 PID: 515 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   42.447239][  T515] Modules linked in: 8021q vrf veth
| [   42.448218][  T515] Tainted: [B]=BAD_PAGE
[   42.448466][  T515] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   42.448851][  T515] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   42.449258][  T515] 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 a5 91 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 a5 91 	mov    $0xffffffff91a58d60,%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
[   42.450409][  T515] RSP: 0018:ffffc90000d671f0 EFLAGS: 00010286
[   42.450798][  T515] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   42.451253][  T515] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   42.451751][  T515] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff247e134
[   42.452203][  T515] R10: 0000000000000003 R11: ffffc90000d66d80 R12: 0000000000000001
[   42.452682][  T515] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   42.453140][  T515] FS:  00007fc345e7e800(0000) GS:ffff8880a29f2000(0000) knlGS:0000000000000000
[   42.453685][  T515] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   42.454063][  T515] CR2: 00007fa85bf1f658 CR3: 000000000bc3a004 CR4: 0000000000772ef0
[   42.454519][  T515] PKRU: 55555554
[   42.454743][  T515] Call Trace:
[   42.454977][  T515]  <TASK>
[   42.455128][  T515]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   42.455446][  T515]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   42.455754][  T515]  ? generic_xdp_install (net/core/dev.c:11630)
[   42.456062][  T515]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   42.456386][  T515]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   42.456707][  T515]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   42.457108][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.457435][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.457741][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.458054][  T515]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   42.458387][  T515]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   42.458701][  T515]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   42.459097][  T515]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   42.459423][  T515]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   42.459735][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.460060][  T515]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   42.460382][  T515]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   42.460686][  T515]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   42.460996][  T515]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   42.461295][  T515]  ? 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)
[   42.461632][  T515]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   42.461944][  T515]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   42.462253][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.462580][  T515]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   42.462888][  T515]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   42.463200][  T515]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   42.463528][  T515]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   42.463848][  T515]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   42.464173][  T515]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   42.464567][  T515]  ? __copy_msghdr (net/socket.c:2556)
[   42.464871][  T515]  ___sys_sendmsg (net/socket.c:2686)
[   42.465163][  T515]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   42.465455][  T515]  ? __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)
[   42.465815][  T515]  ? copy_msghdr_from_user (net/socket.c:2673)
[   42.466113][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.466436][  T515]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   42.466737][  T515]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   42.467030][  T515]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   42.467325][  T515]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   42.467639][  T515]  __sys_sendmsg (net/socket.c:2716)
[   42.467941][  T515]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   42.468308][  T515]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   42.468619][  T515]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   42.468914][  T515]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   42.469215][  T515]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   42.469580][  T515] RIP: 0033:0x7fc34604c1d7
[   42.469877][  T515] 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)
[   42.470929][  T515] RSP: 002b:00007ffc183d0588 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   42.471381][  T515] RAX: ffffffffffffffda RBX: 00007ffc183d0cb0 RCX: 00007fc34604c1d7
[   42.471827][  T515] RDX: 0000000000000000 RSI: 00007ffc183d05f0 RDI: 0000000000000005
[   42.472246][  T515] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   42.472696][  T515] R10: 00007fc345f48f60 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