======================================
| xx__-> [   19.158444][  T327] ==================================================================
| [   19.158751][  T327] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   19.159012][  T327] Read of size 1 at addr ffff8880059aa6c4 by task ip/327
| [   19.159229][  T327]
[   19.159322][  T327] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.159324][  T327] Call Trace:
[   19.159326][  T327]  <TASK>
[   19.159328][  T327]  dump_stack_lvl (lib/dump_stack.c:123)
[   19.159333][  T327]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   19.159340][  T327]  ? kobject_put (lib/kobject.c:733)
[   19.159344][  T327]  print_report (mm/kasan/report.c:483)
[   19.159347][  T327]  ? kobject_put (lib/kobject.c:733)
[   19.159350][  T327]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   19.159354][  T327]  ? kobject_put (lib/kobject.c:733)
[   19.159357][  T327]  kasan_report (mm/kasan/report.c:597)
[   19.159361][  T327]  ? kobject_put (lib/kobject.c:733)
[   19.159366][  T327]  kobject_put (lib/kobject.c:733)
[   19.159369][  T327]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   19.159375][  T327]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   19.159379][  T327]  ? generic_xdp_install (net/core/dev.c:11630)
[   19.159382][  T327]  ? 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)
[   19.159388][  T327]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   19.159393][  T327]  ? br_dev_delete (net/bridge/br_if.c:397)
[   19.159397][  T327]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   19.159402][  T327]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.159422][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.159430][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.159435][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.159439][  T327]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   19.159442][  T327]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.159446][  T327]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.159449][  T327]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   19.159454][  T327]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.159457][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.159463][  T327]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   19.159467][  T327]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.159471][  T327]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   19.159478][  T327]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   19.159480][  T327]  ? 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)
[   19.159484][  T327]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   19.159488][  T327]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   19.159491][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.159496][  T327]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   19.159501][  T327]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.159504][  T327]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   19.159509][  T327]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.159512][  T327]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   19.159516][  T327]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   19.159518][  T327]  ? __copy_msghdr (net/socket.c:2556)
[   19.159526][  T327]  ___sys_sendmsg (net/socket.c:2686)
[   19.159529][  T327]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   19.159533][  T327]  ? __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)
[   19.159538][  T327]  ? copy_msghdr_from_user (net/socket.c:2673)
[   19.159542][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.159546][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.159551][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.159555][  T327]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   19.159559][  T327]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.159564][  T327]  __sys_sendmsg (net/socket.c:2716)
[   19.159567][  T327]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   19.159570][  T327]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   19.159576][  T327]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   19.159581][  T327]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   19.159587][  T327]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   19.159590][  T327] RIP: 0033:0x7fc98b46e1d7
[   19.159594][  T327] 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)
[   19.159597][  T327] RSP: 002b:00007ffe79ea76f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   19.159601][  T327] RAX: ffffffffffffffda RBX: 00007ffe79ea7e20 RCX: 00007fc98b46e1d7
[   19.159603][  T327] RDX: 0000000000000000 RSI: 00007ffe79ea7760 RDI: 0000000000000005
[   19.159605][  T327] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   19.159607][  T327] R10: 00007fc98b36af60 R11: 0000000000000246 R12: 0000000000000002
[   19.159608][  T327] R13: 00000000690df4e0 R14: 0000000000499600 R15: 0000000000000000
| [   19.200294][  T327] refcount_t: underflow; use-after-free.
| [   19.200518][  T327] WARNING: CPU: 3 PID: 327 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   19.201309][  T327] Modules linked in:
| [   19.201893][  T327] Tainted: [B]=BAD_PAGE
[   19.202049][  T327] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.202311][  T327] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   19.202587][  T327] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 85 94 e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
All code
========
   0:	cc                   	int3
   1:	38 03                	cmp    %al,(%rbx)
   3:	80 fb 01             	cmp    $0x1,%bl
   6:	0f 87 29 33 d7 fe    	ja     0xfffffffffed73335
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 17 cc 38 03 01 	movb   $0x1,0x338cc17(%rip)        # 0x338cc33
  1c:	90                   	nop
  1d:	48 c7 c7 40 ba 85 94 	mov    $0xffffffff9485ba40,%rdi
  24:	e8 62 d6 16 ff       	call   0xffffffffff16d68b
  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 c0 9d a0 ff       	call   0xffffffffffa09dfb
  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 c0 9d a0 ff       	call   0xffffffffffa09dd1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   19.203321][  T327] RSP: 0018:ffffc90000ec71f0 EFLAGS: 00010286
[   19.203592][  T327] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   19.203918][  T327] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   19.204223][  T327] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2b00934
[   19.204548][  T327] R10: 0000000000000003 R11: ffffc90000ec6d80 R12: 0000000000000001
[   19.204921][  T327] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   19.205226][  T327] FS:  00007fc98b2a0800(0000) GS:ffff8880d6488000(0000) knlGS:0000000000000000
[   19.205580][  T327] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.205881][  T327] CR2: 000055a758d0ebf8 CR3: 000000000a15b005 CR4: 0000000000772ef0
[   19.206188][  T327] PKRU: 55555554
[   19.206343][  T327] Call Trace:
[   19.206498][  T327]  <TASK>
[   19.206602][  T327]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   19.206818][  T327]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   19.207044][  T327]  ? generic_xdp_install (net/core/dev.c:11630)
[   19.207243][  T327]  ? 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)
[   19.207445][  T327]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   19.207655][  T327]  ? br_dev_delete (net/bridge/br_if.c:397)
[   19.207860][  T327]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   19.208061][  T327]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.208321][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.208531][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.208738][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.208937][  T327]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   19.209136][  T327]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.209336][  T327]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   19.209582][  T327]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   19.209790][  T327]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.209996][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.210200][  T327]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   19.210399][  T327]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   19.210601][  T327]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   19.210813][  T327]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   19.211011][  T327]  ? 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)
[   19.211210][  T327]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   19.211408][  T327]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   19.211608][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.211815][  T327]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   19.212016][  T327]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.212215][  T327]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   19.212413][  T327]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   19.212608][  T327]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   19.212810][  T327]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   19.213059][  T327]  ? __copy_msghdr (net/socket.c:2556)
[   19.213264][  T327]  ___sys_sendmsg (net/socket.c:2686)
[   19.213471][  T327]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   19.213684][  T327]  ? __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)
[   19.213944][  T327]  ? copy_msghdr_from_user (net/socket.c:2673)
[   19.214154][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.214361][  T327]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   19.214568][  T327]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   19.214783][  T327]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   19.214996][  T327]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   19.215205][  T327]  __sys_sendmsg (net/socket.c:2716)
[   19.215408][  T327]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   19.215682][  T327]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   19.215895][  T327]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   19.216101][  T327]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   19.216311][  T327]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   19.216584][  T327] RIP: 0033:0x7fc98b46e1d7
[   19.216817][  T327] 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)
[   19.217586][  T327] RSP: 002b:00007ffe79ea76f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   19.217920][  T327] RAX: ffffffffffffffda RBX: 00007ffe79ea7e20 RCX: 00007fc98b46e1d7
[   19.218239][  T327] RDX: 0000000000000000 RSI: 00007ffe79ea7760 RDI: 0000000000000005
[   19.218551][  T327] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   19.218874][  T327] R10: 00007fc98b36af60 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