======================================
| [   18.753594][  T291] ==================================================================
| [   18.753976][  T291] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   18.754290][  T291] Read of size 1 at addr ffff888008a016c4 by task ip/291
| [   18.754529][  T291]
[   18.754642][  T291] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.754646][  T291] Call Trace:
[   18.754650][  T291]  <TASK>
[   18.754653][  T291]  dump_stack_lvl (lib/dump_stack.c:123)
[   18.754658][  T291]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   18.754673][  T291]  ? kobject_put (lib/kobject.c:733)
[   18.754677][  T291]  print_report (mm/kasan/report.c:483)
[   18.754681][  T291]  ? kobject_put (lib/kobject.c:733)
[   18.754684][  T291]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   18.754687][  T291]  ? kobject_put (lib/kobject.c:733)
[   18.754690][  T291]  kasan_report (mm/kasan/report.c:597)
[   18.754694][  T291]  ? kobject_put (lib/kobject.c:733)
[   18.754700][  T291]  kobject_put (lib/kobject.c:733)
[   18.754703][  T291]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.754715][  T291]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   18.754719][  T291]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.754725][  T291]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   18.754731][  T291]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   18.754737][  T291]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.754756][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.754770][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.754775][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.754779][  T291]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   18.754783][  T291]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.754786][  T291]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.754790][  T291]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   18.754794][  T291]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.754798][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.754804][  T291]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   18.754810][  T291]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.754814][  T291]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   18.754820][  T291]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   18.754823][  T291]  ? 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)
[   18.754827][  T291]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   18.754831][  T291]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   18.754834][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.754839][  T291]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   18.754843][  T291]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.754847][  T291]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   18.754857][  T291]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.754861][  T291]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   18.754866][  T291]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   18.754869][  T291]  ? __copy_msghdr (net/socket.c:2556)
[   18.754877][  T291]  ___sys_sendmsg (net/socket.c:2686)
[   18.754879][  T291]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   18.754884][  T291]  ? __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)
[   18.754889][  T291]  ? copy_msghdr_from_user (net/socket.c:2673)
[   18.754894][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.754898][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.754903][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.754907][  T291]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   18.754917][  T291]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.754922][  T291]  __sys_sendmsg (net/socket.c:2716)
[   18.754925][  T291]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   18.754927][  T291]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   18.754935][  T291]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.754941][  T291]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.754947][  T291]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.754956][  T291] RIP: 0033:0x7f1893b601d7
[   18.754962][  T291] 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)
[   18.754965][  T291] RSP: 002b:00007ffcc4afd578 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   18.754972][  T291] RAX: ffffffffffffffda RBX: 00007ffcc4afdca0 RCX: 00007f1893b601d7
[   18.754974][  T291] RDX: 0000000000000000 RSI: 00007ffcc4afd5e0 RDI: 0000000000000005
[   18.754977][  T291] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   18.754978][  T291] R10: 00007f1893a5cf60 R11: 0000000000000246 R12: 0000000000000001
[   18.754980][  T291] R13: 00000000690df495 R14: 0000000000499600 R15: 0000000000000000
| [   18.785262][  T291] refcount_t: underflow; use-after-free.
| [   18.785502][  T291] WARNING: CPU: 3 PID: 291 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   18.785979][  T291] Modules linked in:
| [   18.787265][  T291] Tainted: [B]=BAD_PAGE
[   18.787495][  T291] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.787739][  T291] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   18.787991][  T291] 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 25 93 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 25 93 	mov    $0xffffffff9325ba40,%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
[   18.788762][  T291] RSP: 0018:ffffc90000ce71f0 EFLAGS: 00010286
[   18.789007][  T291] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   18.789359][  T291] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   18.789647][  T291] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2840934
[   18.789940][  T291] R10: 0000000000000003 R11: ffffc90000ce6d80 R12: 0000000000000001
[   18.790435][  T291] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   18.790727][  T291] FS:  00007f1893992800(0000) GS:ffff8880d7a88000(0000) knlGS:0000000000000000
[   18.791172][  T291] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.791535][  T291] CR2: 00000000004e5ae0 CR3: 000000000bc82004 CR4: 0000000000772ef0
[   18.791927][  T291] PKRU: 55555554
[   18.792129][  T291] Call Trace:
[   18.792362][  T291]  <TASK>
[   18.792517][  T291]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.792808][  T291]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   18.793113][  T291]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.793422][  T291]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   18.793728][  T291]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   18.794032][  T291]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.794435][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.794736][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.795038][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.795359][  T291]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   18.795659][  T291]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.795970][  T291]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   18.796359][  T291]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   18.796661][  T291]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.796961][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.797264][  T291]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   18.797587][  T291]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   18.797890][  T291]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   18.798190][  T291]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   18.798646][  T291]  ? 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)
[   18.798848][  T291]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   18.799038][  T291]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   18.799228][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.799558][  T291]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   18.799751][  T291]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.799944][  T291]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   18.800132][  T291]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   18.800515][  T291]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   18.800706][  T291]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   18.800939][  T291]  ? __copy_msghdr (net/socket.c:2556)
[   18.801128][  T291]  ___sys_sendmsg (net/socket.c:2686)
[   18.801340][  T291]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   18.801533][  T291]  ? __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)
[   18.801768][  T291]  ? copy_msghdr_from_user (net/socket.c:2673)
[   18.801954][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.802238][  T291]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   18.802439][  T291]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   18.802628][  T291]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   18.802829][  T291]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.803109][  T291]  __sys_sendmsg (net/socket.c:2716)
[   18.803301][  T291]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   18.803550][  T291]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   18.803739][  T291]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.804021][  T291]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.804210][  T291]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.804490][  T291] RIP: 0033:0x7f1893b601d7
[   18.804696][  T291] 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)
[   18.805475][  T291] RSP: 002b:00007ffcc4afd578 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   18.805871][  T291] RAX: ffffffffffffffda RBX: 00007ffcc4afdca0 RCX: 00007f1893b601d7
[   18.806160][  T291] RDX: 0000000000000000 RSI: 00007ffcc4afd5e0 RDI: 0000000000000005
[   18.806554][  T291] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   18.806839][  T291] R10: 00007f1893a5cf60 R11: 0000000000000246 R12: 0000000000000001


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