======================================
| [   25.878089][  T391] ==================================================================
| [   25.878417][  T391] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   25.878696][  T391] Read of size 1 at addr ffff8880078e16c4 by task ip/391
| [   25.878967][  T391]
[   25.879068][  T391] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.879070][  T391] Call Trace:
[   25.879072][  T391]  <TASK>
[   25.879074][  T391]  dump_stack_lvl (lib/dump_stack.c:123)
[   25.879081][  T391]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   25.879088][  T391]  ? kobject_put (lib/kobject.c:733)
[   25.879091][  T391]  print_report (mm/kasan/report.c:483)
[   25.879095][  T391]  ? kobject_put (lib/kobject.c:733)
[   25.879098][  T391]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   25.879102][  T391]  ? kobject_put (lib/kobject.c:733)
[   25.879105][  T391]  kasan_report (mm/kasan/report.c:597)
[   25.879109][  T391]  ? kobject_put (lib/kobject.c:733)
[   25.879114][  T391]  kobject_put (lib/kobject.c:733)
[   25.879117][  T391]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   25.879123][  T391]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   25.879127][  T391]  ? generic_xdp_install (net/core/dev.c:11630)
[   25.879131][  T391]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   25.879137][  T391]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   25.879143][  T391]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.879161][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.879169][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.879175][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.879179][  T391]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   25.879182][  T391]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.879185][  T391]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.879189][  T391]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   25.879193][  T391]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.879196][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.879202][  T391]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   25.879206][  T391]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.879210][  T391]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   25.879216][  T391]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   25.879219][  T391]  ? 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)
[   25.879222][  T391]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   25.879226][  T391]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   25.879230][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.879234][  T391]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   25.879238][  T391]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.879241][  T391]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   25.879246][  T391]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.879249][  T391]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   25.879253][  T391]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   25.879256][  T391]  ? __copy_msghdr (net/socket.c:2556)
[   25.879263][  T391]  ___sys_sendmsg (net/socket.c:2686)
[   25.879265][  T391]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   25.879269][  T391]  ? __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)
[   25.879272][  T391]  ? copy_msghdr_from_user (net/socket.c:2673)
[   25.879277][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.879281][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.879286][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.879289][  T391]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   25.879295][  T391]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.879300][  T391]  __sys_sendmsg (net/socket.c:2716)
[   25.879302][  T391]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   25.879305][  T391]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   25.879312][  T391]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   25.879317][  T391]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   25.879323][  T391]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   25.879326][  T391] RIP: 0033:0x7f3a59ec41d7
[   25.879330][  T391] 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)
[   25.879333][  T391] RSP: 002b:00007ffffb532848 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.879337][  T391] RAX: ffffffffffffffda RBX: 00007ffffb532f70 RCX: 00007f3a59ec41d7
[   25.879339][  T391] RDX: 0000000000000000 RSI: 00007ffffb5328b0 RDI: 0000000000000005
[   25.879341][  T391] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   25.879342][  T391] R10: 00007f3a59dc0f60 R11: 0000000000000246 R12: 0000000000000001
[   25.879344][  T391] R13: 00000000690df65d R14: 0000000000499600 R15: 0000000000000000
| [   25.909702][  T391] refcount_t: underflow; use-after-free.
| [   25.910821][  T391] WARNING: CPU: 2 PID: 391 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   25.911194][  T391] Modules linked in:
| [   25.911713][  T391] Tainted: [B]=BAD_PAGE
[   25.911889][  T391] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.912123][  T391] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   25.912368][  T391] 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 e5 85 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 e5 85 	mov    $0xffffffff85e5ba40,%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
[   25.913040][  T391] RSP: 0018:ffffc900010871f0 EFLAGS: 00010286
[   25.913271][  T391] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   25.913557][  T391] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   25.913843][  T391] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0dc0934
[   25.914121][  T391] R10: 0000000000000003 R11: ffffc90001086d80 R12: 0000000000000001
[   25.914386][  T391] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   25.914654][  T391] FS:  00007f3a59cf6800(0000) GS:ffff8880e4e08000(0000) knlGS:0000000000000000
[   25.914996][  T391] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.915221][  T391] CR2: 00000000004e5ae0 CR3: 000000000f25a003 CR4: 0000000000772ef0
[   25.915503][  T391] PKRU: 55555554
[   25.915644][  T391] Call Trace:
[   25.915796][  T391]  <TASK>
[   25.915924][  T391]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   25.916115][  T391]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   25.916296][  T391]  ? generic_xdp_install (net/core/dev.c:11630)
[   25.916503][  T391]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   25.916686][  T391]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   25.916895][  T391]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.917140][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.917336][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.917551][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.917752][  T391]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   25.917985][  T391]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.918166][  T391]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   25.918398][  T391]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   25.918588][  T391]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.918869][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.919130][  T391]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   25.919378][  T391]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   25.919630][  T391]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   25.919909][  T391]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   25.920155][  T391]  ? 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)
[   25.920415][  T391]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   25.920660][  T391]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   25.920940][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.921191][  T391]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   25.921468][  T391]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.921715][  T391]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   25.922028][  T391]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   25.922269][  T391]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   25.922538][  T391]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   25.922832][  T391]  ? __copy_msghdr (net/socket.c:2556)
[   25.923096][  T391]  ___sys_sendmsg (net/socket.c:2686)
[   25.923333][  T391]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   25.923592][  T391]  ? __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)
[   25.923916][  T391]  ? copy_msghdr_from_user (net/socket.c:2673)
[   25.924163][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.924423][  T391]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   25.924667][  T391]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   25.924946][  T391]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   25.925189][  T391]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   25.925451][  T391]  __sys_sendmsg (net/socket.c:2716)
[   25.925698][  T391]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   25.926020][  T391]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   25.926261][  T391]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   25.926525][  T391]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   25.926772][  T391]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   25.927096][  T391] RIP: 0033:0x7f3a59ec41d7
[   25.927362][  T391] 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)
[   25.928074][  T391] RSP: 002b:00007ffffb532848 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.928421][  T391] RAX: ffffffffffffffda RBX: 00007ffffb532f70 RCX: 00007f3a59ec41d7
[   25.928753][  T391] RDX: 0000000000000000 RSI: 00007ffffb5328b0 RDI: 0000000000000005
[   25.929118][  T391] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   25.929463][  T391] R10: 00007f3a59dc0f60 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