======================================
| xx__-> [   36.162301][  T385] ==================================================================
| [   36.162633][  T385] BUG: KASAN: out-of-bounds in kobject_put (lib/kobject.c:733)
| [   36.162883][  T385] Read of size 1 at addr ffff88800cf506c4 by task tun/385
| [   36.163106][  T385]
[   36.163210][  T385] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   36.163212][  T385] Call Trace:
[   36.163214][  T385]  <TASK>
[   36.163216][  T385]  dump_stack_lvl (lib/dump_stack.c:123)
[   36.163223][  T385]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   36.163231][  T385]  ? kobject_put (lib/kobject.c:733)
[   36.163235][  T385]  print_report (mm/kasan/report.c:483)
[   36.163239][  T385]  ? kobject_put (lib/kobject.c:733)
[   36.163242][  T385]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   36.163246][  T385]  ? kobject_put (lib/kobject.c:733)
[   36.163249][  T385]  kasan_report (mm/kasan/report.c:597)
[   36.163253][  T385]  ? kobject_put (lib/kobject.c:733)
[   36.163258][  T385]  kobject_put (lib/kobject.c:733)
[   36.163262][  T385]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   36.163269][  T385]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   36.163273][  T385]  ? generic_xdp_install (net/core/dev.c:11630)
[   36.163277][  T385]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   36.163283][  T385]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   36.163289][  T385]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.163308][  T385]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.163317][  T385]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.163323][  T385]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.163327][  T385]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   36.163330][  T385]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   36.163333][  T385]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.163337][  T385]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   36.163341][  T385]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.163345][  T385]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.163351][  T385]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   36.163356][  T385]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.163360][  T385]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   36.163366][  T385]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   36.163369][  T385]  ? 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)
[   36.163372][  T385]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   36.163376][  T385]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   36.163379][  T385]  ? netlink_insert (net/netlink/af_netlink.c:591 (discriminator 3))
[   36.163382][  T385]  ? netlink_autobind.isra.0 (net/netlink/af_netlink.c:804)
[   36.163385][  T385]  ? netlink_autobind.isra.0 (net/netlink/af_netlink.c:827)
[   36.163389][  T385]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   36.163393][  T385]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   36.163399][  T385]  __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2244)
[   36.163404][  T385]  ? __ia32_sys_getpeername (net/socket.c:2211)
[   36.163409][  T385]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   36.163416][  T385]  ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 21))
[   36.163422][  T385]  ? rseq_update_cpu_node_id (kernel/rseq.c:189 (discriminator 10))
[   36.163426][  T385]  ? __rseq_handle_notify_resume (kernel/rseq.c:442)
[   36.163430][  T385]  ? rseq_get_rseq_cs.isra.0 (kernel/rseq.c:425)
[   36.163432][  T385]  ? __sys_socket (net/socket.c:516 net/socket.c:1756)
[   36.163435][  T385]  ? update_socket_protocol+0x10/0x10
[   36.163438][  T385]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[   36.163444][  T385]  __x64_sys_sendto (net/socket.c:2247)
[   36.163447][  T385]  ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:124 arch/x86/entry/syscall_64.c:90)
[   36.163452][  T385]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   36.163461][  T385]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   36.163465][  T385]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   36.163468][  T385] RIP: 0033:0x7f7210386120
[   36.163474][  T385] Code: ff ff 64 89 02 eb bd 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 1d 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 68 c3 0f 1f 80 00 00 00 00 41 54 48 83 ec 20
All code
========
   0:	ff                   	(bad)
   1:	ff 64 89 02          	jmp    *0x2(%rcx,%rcx,4)
   5:	eb bd                	jmp    0xffffffffffffffc4
   7:	0f 1f 00             	nopl   (%rax)
   a:	f3 0f 1e fa          	endbr64
   e:	41 89 ca             	mov    %ecx,%r10d
  11:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  18:	00 
  19:	85 c0                	test   %eax,%eax
  1b:	75 1d                	jne    0x3a
  1d:	45 31 c9             	xor    %r9d,%r9d
  20:	45 31 c0             	xor    %r8d,%r8d
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 68                	ja     0x9a
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	41 54                	push   %r12
  3c:	48 83 ec 20          	sub    $0x20,%rsp

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 68                	ja     0x70
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	41 54                	push   %r12
  12:	48 83 ec 20          	sub    $0x20,%rsp
[   36.163476][  T385] RSP: 002b:00007fff0b9ca208 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   36.163480][  T385] RAX: ffffffffffffffda RBX: 00007fff0b9ca2a0 RCX: 00007f7210386120
[   36.163483][  T385] RDX: 0000000000000034 RSI: 00007fff0b9ca210 RDI: 0000000000000007
[   36.163484][  T385] RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000
[   36.163486][  T385] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   36.163487][  T385] R13: 00007fff0b9ca2a0 R14: 00007f7210272000 R15: 0000000000406140
| [   36.179443][  T385] refcount_t: underflow; use-after-free.
| [   36.179675][  T385] WARNING: CPU: 1 PID: 385 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   36.180199][  T385] Modules linked in:
| [   36.180655][  T385] Tainted: [B]=BAD_PAGE
[   36.180778][  T385] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   36.180982][  T385] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   36.181274][  T385] 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 88 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 88 	mov    $0xffffffff88e5ba40,%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
[   36.181846][  T385] RSP: 0018:ffffc90000f073f0 EFLAGS: 00010286
[   36.182120][  T385] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   36.182382][  T385] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   36.182616][  T385] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff13c0934
[   36.182942][  T385] R10: 0000000000000003 R11: ffffc90000f06f80 R12: 0000000000000001
[   36.183271][  T385] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   36.183525][  T385] FS:  00007f7210273b80(0000) GS:ffff8880e1d88000(0000) knlGS:0000000000000000
[   36.183808][  T385] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.184172][  T385] CR2: 00007f72103863a0 CR3: 00000000097d2003 CR4: 0000000000772ef0
[   36.184424][  T385] PKRU: 55555554
[   36.184543][  T385] Call Trace:
[   36.184663][  T385]  <TASK>
[   36.184747][  T385]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   36.184911][  T385]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   36.185141][  T385]  ? generic_xdp_install (net/core/dev.c:11630)
[   36.185302][  T385]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   36.185470][  T385]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   36.185629][  T385]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.185932][  T385]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.186156][  T385]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.186313][  T385]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   36.186481][  T385]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   36.186635][  T385]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   36.186792][  T385]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   36.187142][  T385]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   36.187298][  T385]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.187463][  T385]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   36.187622][  T385]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   36.187781][  T385]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   36.187936][  T385]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   36.188199][  T385]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   36.188357][  T385]  ? 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)
[   36.188529][  T385]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   36.188683][  T385]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   36.188929][  T385]  ? netlink_insert (net/netlink/af_netlink.c:591 (discriminator 3))
[   36.189089][  T385]  ? netlink_autobind.isra.0 (net/netlink/af_netlink.c:804)
[   36.189245][  T385]  ? netlink_autobind.isra.0 (net/netlink/af_netlink.c:827)
[   36.189401][  T385]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   36.189678][  T385]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   36.189845][  T385]  __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2244)
[   36.190002][  T385]  ? __ia32_sys_getpeername (net/socket.c:2211)
[   36.190167][  T385]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   36.190416][  T385]  ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 21))
[   36.190587][  T385]  ? rseq_update_cpu_node_id (kernel/rseq.c:189 (discriminator 10))
[   36.190742][  T385]  ? __rseq_handle_notify_resume (kernel/rseq.c:442)
[   36.190936][  T385]  ? rseq_get_rseq_cs.isra.0 (kernel/rseq.c:425)
[   36.191193][  T385]  ? __sys_socket (net/socket.c:516 net/socket.c:1756)
[   36.191356][  T385]  ? update_socket_protocol+0x10/0x10
[   36.191524][  T385]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[   36.191685][  T385]  __x64_sys_sendto (net/socket.c:2247)
[   36.191938][  T385]  ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:124 arch/x86/entry/syscall_64.c:90)
[   36.192101][  T385]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   36.192262][  T385]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   36.192429][  T385]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   36.192735][  T385] RIP: 0033:0x7f7210386120
[   36.192905][  T385] Code: ff ff 64 89 02 eb bd 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 1d 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 68 c3 0f 1f 80 00 00 00 00 41 54 48 83 ec 20
All code
========
   0:	ff                   	(bad)
   1:	ff 64 89 02          	jmp    *0x2(%rcx,%rcx,4)
   5:	eb bd                	jmp    0xffffffffffffffc4
   7:	0f 1f 00             	nopl   (%rax)
   a:	f3 0f 1e fa          	endbr64
   e:	41 89 ca             	mov    %ecx,%r10d
  11:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  18:	00 
  19:	85 c0                	test   %eax,%eax
  1b:	75 1d                	jne    0x3a
  1d:	45 31 c9             	xor    %r9d,%r9d
  20:	45 31 c0             	xor    %r8d,%r8d
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 68                	ja     0x9a
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	41 54                	push   %r12
  3c:	48 83 ec 20          	sub    $0x20,%rsp

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 68                	ja     0x70
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	41 54                	push   %r12
  12:	48 83 ec 20          	sub    $0x20,%rsp
[   36.193591][  T385] RSP: 002b:00007fff0b9ca208 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[   36.193840][  T385] RAX: ffffffffffffffda RBX: 00007fff0b9ca2a0 RCX: 00007f7210386120
[   36.194081][  T385] RDX: 0000000000000034 RSI: 00007fff0b9ca210 RDI: 0000000000000007
[   36.194315][  T385] RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000
[   36.194558][  T385] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


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