======================================
| xx__-> [   21.178876][  T292] ==================================================================
| [   21.179406][  T292] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   21.179877][  T292] Read of size 1 at addr ffff88800e1ba6ac by task ip/292
| [   21.180262][  T292]
[   21.180446][  T292] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.180450][  T292] Call Trace:
[   21.180454][  T292]  <TASK>
[   21.180457][  T292]  dump_stack_lvl (lib/dump_stack.c:123)
[   21.180470][  T292]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   21.180492][  T292]  ? kobject_put (lib/kobject.c:733)
[   21.180497][  T292]  print_report (mm/kasan/report.c:483)
[   21.180503][  T292]  ? kobject_put (lib/kobject.c:733)
[   21.180508][  T292]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   21.180514][  T292]  ? kobject_put (lib/kobject.c:733)
[   21.180519][  T292]  kasan_report (mm/kasan/report.c:597)
[   21.180525][  T292]  ? kobject_put (lib/kobject.c:733)
[   21.180535][  T292]  kobject_put (lib/kobject.c:733)
[   21.180542][  T292]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   21.180556][  T292]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   21.180561][  T292]  ? generic_xdp_install (net/core/dev.c:11630)
[   21.180565][  T292]  ? 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)
[   21.180583][  T292]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   21.180594][  T292]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   21.180649][  T292]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   21.180660][  T292]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   21.180697][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.180715][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.180726][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.180733][  T292]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   21.180737][  T292]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   21.180744][  T292]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   21.180751][  T292]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   21.180758][  T292]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   21.180763][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.180776][  T292]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   21.180783][  T292]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   21.180790][  T292]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   21.180803][  T292]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   21.180808][  T292]  ? 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)
[   21.180815][  T292]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   21.180823][  T292]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   21.180830][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.180839][  T292]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   21.180848][  T292]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   21.180853][  T292]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   21.180869][  T292]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   21.180879][  T292]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   21.180893][  T292]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   21.180899][  T292]  ? __copy_msghdr (net/socket.c:2556)
[   21.180915][  T292]  ___sys_sendmsg (net/socket.c:2686)
[   21.180920][  T292]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   21.180925][  T292]  ? __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)
[   21.180941][  T292]  ? copy_msghdr_from_user (net/socket.c:2673)
[   21.180950][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.180957][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.180968][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.180974][  T292]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   21.180990][  T292]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   21.181002][  T292]  __sys_sendmsg (net/socket.c:2716)
[   21.181006][  T292]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   21.181013][  T292]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   21.181026][  T292]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   21.181034][  T292]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   21.181043][  T292]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   21.181049][  T292] RIP: 0033:0x7f277487f1d7
[   21.181058][  T292] 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)
[   21.181062][  T292] RSP: 002b:00007ffff5d13f68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   21.181072][  T292] RAX: ffffffffffffffda RBX: 00007ffff5d14690 RCX: 00007f277487f1d7
[   21.181076][  T292] RDX: 0000000000000000 RSI: 00007ffff5d13fd0 RDI: 0000000000000005
[   21.181080][  T292] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   21.181083][  T292] R10: 00007f277477bf60 R11: 0000000000000246 R12: 0000000000000002
[   21.181086][  T292] R13: 00000000690deb0c R14: 0000000000499600 R15: 0000000000000000
| [   21.216959][  T292] refcount_t: underflow; use-after-free.
| [   21.217218][  T292] WARNING: CPU: 0 PID: 292 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   21.217648][  T292] Modules linked in: bridge stp llc veth
| [   21.218519][  T292] Tainted: [B]=BAD_PAGE
[   21.218733][  T292] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.219083][  T292] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   21.219488][  T292] 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 88 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 88 	mov    $0xffffffff88a58d60,%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
[   21.220529][  T292] RSP: 0018:ffffc900005971f0 EFLAGS: 00010286
[   21.220904][  T292] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   21.221357][  T292] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   21.221800][  T292] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff127e134
[   21.222257][  T292] R10: 0000000000000003 R11: ffffc90000596d80 R12: 0000000000000001
[   21.222706][  T292] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   21.223138][  T292] FS:  00007f27746b1800(0000) GS:ffff8880ab9f2000(0000) knlGS:0000000000000000
[   21.223651][  T292] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   21.224015][  T292] CR2: 000055f33ccebbd8 CR3: 000000000c4ce003 CR4: 0000000000772ef0
[   21.224464][  T292] PKRU: 55555554
[   21.224686][  T292] Call Trace:
[   21.224899][  T292]  <TASK>
[   21.225014][  T292]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   21.225251][  T292]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   21.225558][  T292]  ? generic_xdp_install (net/core/dev.c:11630)
[   21.225751][  T292]  ? 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)
[   21.226049][  T292]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   21.226271][  T292]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   21.226535][  T292]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   21.226722][  T292]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   21.227070][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.227299][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.227503][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.227802][  T292]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   21.227982][  T292]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   21.228176][  T292]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   21.228406][  T292]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   21.228670][  T292]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   21.228835][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.229016][  T292]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   21.229229][  T292]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   21.229541][  T292]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   21.229728][  T292]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   21.229909][  T292]  ? 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)
[   21.230091][  T292]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   21.230334][  T292]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   21.230651][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.230932][  T292]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   21.231222][  T292]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   21.231690][  T292]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   21.231978][  T292]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   21.232275][  T292]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   21.232557][  T292]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   21.233070][  T292]  ? __copy_msghdr (net/socket.c:2556)
[   21.233360][  T292]  ___sys_sendmsg (net/socket.c:2686)
[   21.233604][  T292]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   21.233816][  T292]  ? __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)
[   21.234126][  T292]  ? copy_msghdr_from_user (net/socket.c:2673)
[   21.234328][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.234527][  T292]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   21.234723][  T292]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   21.234916][  T292]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   21.235096][  T292]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   21.235291][  T292]  __sys_sendmsg (net/socket.c:2716)
[   21.235508][  T292]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   21.235900][  T292]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   21.236123][  T292]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   21.236379][  T292]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   21.236691][  T292]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   21.236954][  T292] RIP: 0033:0x7f277487f1d7
[   21.237177][  T292] 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)
[   21.238007][  T292] RSP: 002b:00007ffff5d13f68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   21.238444][  T292] RAX: ffffffffffffffda RBX: 00007ffff5d14690 RCX: 00007f277487f1d7
[   21.238720][  T292] RDX: 0000000000000000 RSI: 00007ffff5d13fd0 RDI: 0000000000000005
[   21.239009][  T292] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   21.239389][  T292] R10: 00007f277477bf60 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