======================================
| [   33.901239][  T655] ==================================================================
| [   33.901669][  T655] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   33.902085][  T655] Read of size 1 at addr ffff88800f3116c4 by task ip/655
| [   33.902410][  T655]
[   33.902555][  T655] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   33.902558][  T655] Call Trace:
[   33.902561][  T655]  <TASK>
[   33.902564][  T655]  dump_stack_lvl (lib/dump_stack.c:123)
[   33.902572][  T655]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   33.902587][  T655]  ? kobject_put (lib/kobject.c:733)
[   33.902593][  T655]  print_report (mm/kasan/report.c:483)
[   33.902599][  T655]  ? kobject_put (lib/kobject.c:733)
[   33.902603][  T655]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   33.902609][  T655]  ? kobject_put (lib/kobject.c:733)
[   33.902614][  T655]  kasan_report (mm/kasan/report.c:597)
[   33.902621][  T655]  ? kobject_put (lib/kobject.c:733)
[   33.902630][  T655]  kobject_put (lib/kobject.c:733)
[   33.902636][  T655]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   33.902644][  T655]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   33.902648][  T655]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   33.902654][  T655]  ? generic_xdp_install (net/core/dev.c:11630)
[   33.902662][  T655]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   33.902669][  T655]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   33.902678][  T655]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   33.902715][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.902726][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.902736][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.902743][  T655]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   33.902748][  T655]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   33.902755][  T655]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   33.902760][  T655]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   33.902768][  T655]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   33.902773][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.902784][  T655]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   33.902790][  T655]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   33.902797][  T655]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   33.902808][  T655]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   33.902813][  T655]  ? 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)
[   33.902820][  T655]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   33.902827][  T655]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   33.902833][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.902842][  T655]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   33.902849][  T655]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   33.902855][  T655]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   33.902863][  T655]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   33.902869][  T655]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   33.902875][  T655]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   33.902879][  T655]  ? __copy_msghdr (net/socket.c:2556)
[   33.902892][  T655]  ___sys_sendmsg (net/socket.c:2686)
[   33.902895][  T655]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   33.902902][  T655]  ? __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)
[   33.902909][  T655]  ? copy_msghdr_from_user (net/socket.c:2673)
[   33.902916][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.902925][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.902934][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.902939][  T655]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   33.902946][  T655]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   33.902957][  T655]  __sys_sendmsg (net/socket.c:2716)
[   33.902961][  T655]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   33.902966][  T655]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   33.902980][  T655]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   33.902989][  T655]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   33.902998][  T655]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   33.903003][  T655] RIP: 0033:0x7f76400a91d7
[   33.903009][  T655] 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)
[   33.903014][  T655] RSP: 002b:00007ffce6a73bc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   33.903020][  T655] RAX: ffffffffffffffda RBX: 00007ffce6a742f0 RCX: 00007f76400a91d7
[   33.903023][  T655] RDX: 0000000000000000 RSI: 00007ffce6a73c30 RDI: 0000000000000005
[   33.903026][  T655] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   33.903029][  T655] R10: 00007f763ffa5f60 R11: 0000000000000246 R12: 0000000000000002
[   33.903032][  T655] R13: 00000000690df064 R14: 0000000000499600 R15: 0000000000000000
| [   33.945198][  T655] refcount_t: underflow; use-after-free.
| [   33.945498][  T655] WARNING: CPU: 3 PID: 655 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   33.945980][  T655] Modules linked in:
| [   33.946768][  T655] Tainted: [B]=BAD_PAGE
[   33.946985][  T655] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   33.947329][  T655] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   33.947692][  T655] 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 8b 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 8b 	mov    $0xffffffff8b85ba40,%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
[   33.948681][  T655] RSP: 0018:ffffc900013c71f0 EFLAGS: 00010286
[   33.949026][  T655] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   33.949440][  T655] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   33.949848][  T655] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1900934
[   33.950281][  T655] R10: 0000000000000003 R11: ffffc900013c6d80 R12: 0000000000000001
[   33.950702][  T655] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   33.951126][  T655] FS:  00007f763fedb800(0000) GS:ffff8880df488000(0000) knlGS:0000000000000000
[   33.951584][  T655] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.951918][  T655] CR2: 00000000004e6ae0 CR3: 000000000b5bc006 CR4: 0000000000772ef0
[   33.952319][  T655] PKRU: 55555554
[   33.952517][  T655] Call Trace:
[   33.952712][  T655]  <TASK>
[   33.952848][  T655]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   33.953127][  T655]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   33.953390][  T655]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   33.953648][  T655]  ? generic_xdp_install (net/core/dev.c:11630)
[   33.953915][  T655]  ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387)
[   33.954185][  T655]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   33.954456][  T655]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   33.954806][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.955085][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.955348][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.955615][  T655]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   33.955880][  T655]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   33.956152][  T655]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   33.956488][  T655]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   33.956753][  T655]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   33.957016][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.957289][  T655]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   33.957583][  T655]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   33.957850][  T655]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   33.958123][  T655]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   33.958393][  T655]  ? 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)
[   33.958654][  T655]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   33.958915][  T655]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   33.959189][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.959448][  T655]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   33.959716][  T655]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   33.959982][  T655]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   33.960265][  T655]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   33.960538][  T655]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   33.960802][  T655]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   33.961141][  T655]  ? __copy_msghdr (net/socket.c:2556)
[   33.961407][  T655]  ___sys_sendmsg (net/socket.c:2686)
[   33.961671][  T655]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   33.961939][  T655]  ? __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)
[   33.962431][  T655]  ? copy_msghdr_from_user (net/socket.c:2673)
[   33.962704][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.963142][  T655]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   33.963407][  T655]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   33.963670][  T655]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   33.963933][  T655]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   33.964211][  T655]  __sys_sendmsg (net/socket.c:2716)
[   33.964471][  T655]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   33.964800][  T655]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   33.965085][  T655]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   33.965513][  T655]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   33.965951][  T655]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   33.966286][  T655] RIP: 0033:0x7f76400a91d7
[   33.966558][  T655] 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)
[   33.967508][  T655] RSP: 002b:00007ffce6a73bc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   33.967919][  T655] RAX: ffffffffffffffda RBX: 00007ffce6a742f0 RCX: 00007f76400a91d7
[   33.968332][  T655] RDX: 0000000000000000 RSI: 00007ffce6a73c30 RDI: 0000000000000005
[   33.968894][  T655] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   33.969486][  T655] R10: 00007f763ffa5f60 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