======================================
| [   81.952430][  T578] ==================================================================
| [   81.952861][  T578] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   81.953239][  T578] Read of size 1 at addr ffff88800da796ac by task ip/578
| [   81.953533][  T578]
[   81.953666][  T578] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   81.953672][  T578] Call Trace:
[   81.953677][  T578]  <TASK>
[   81.953679][  T578]  dump_stack_lvl (lib/dump_stack.c:123)
[   81.953687][  T578]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   81.953705][  T578]  ? kobject_put (lib/kobject.c:733)
[   81.953710][  T578]  print_report (mm/kasan/report.c:483)
[   81.953714][  T578]  ? kobject_put (lib/kobject.c:733)
[   81.953718][  T578]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   81.953722][  T578]  ? kobject_put (lib/kobject.c:733)
[   81.953726][  T578]  kasan_report (mm/kasan/report.c:597)
[   81.953731][  T578]  ? kobject_put (lib/kobject.c:733)
[   81.953742][  T578]  kobject_put (lib/kobject.c:733)
[   81.953747][  T578]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   81.953758][  T578]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   81.953763][  T578]  ? generic_xdp_install (net/core/dev.c:11630)
[   81.953767][  T578]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   81.953771][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   81.953790][  T578]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   81.953799][  T578]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   81.953829][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   81.953835][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   81.953844][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   81.953849][  T578]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   81.953852][  T578]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   81.953858][  T578]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   81.953863][  T578]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   81.953868][  T578]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   81.953872][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   81.953882][  T578]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   81.953890][  T578]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   81.953895][  T578]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   81.953905][  T578]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   81.953909][  T578]  ? 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)
[   81.953915][  T578]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   81.953921][  T578]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   81.953927][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   81.953934][  T578]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   81.953941][  T578]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   81.953946][  T578]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   81.953962][  T578]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   81.953967][  T578]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   81.953982][  T578]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   81.953986][  T578]  ? __copy_msghdr (net/socket.c:2556)
[   81.953999][  T578]  ___sys_sendmsg (net/socket.c:2686)
[   81.954003][  T578]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   81.954008][  T578]  ? __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)
[   81.954025][  T578]  ? copy_msghdr_from_user (net/socket.c:2673)
[   81.954033][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   81.954041][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   81.954051][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   81.954057][  T578]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   81.954073][  T578]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   81.954084][  T578]  __sys_sendmsg (net/socket.c:2716)
[   81.954089][  T578]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   81.954093][  T578]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   81.954104][  T578]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   81.954109][  T578]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   81.954120][  T578]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   81.954129][  T578] RIP: 0033:0x7f0ffa3aa1d7
[   81.954135][  T578] 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)
[   81.954139][  T578] RSP: 002b:00007ffda6f35df8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   81.954146][  T578] RAX: ffffffffffffffda RBX: 00007ffda6f36520 RCX: 00007f0ffa3aa1d7
[   81.954149][  T578] RDX: 0000000000000000 RSI: 00007ffda6f35e60 RDI: 0000000000000005
[   81.954152][  T578] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   81.954154][  T578] R10: 00007f0ffa2a6f60 R11: 0000000000000246 R12: 0000000000000002
[   81.954156][  T578] R13: 00000000690dec45 R14: 0000000000499600 R15: 0000000000000000
| [   81.990267][  T578] refcount_t: underflow; use-after-free.
| [   81.990604][  T578] WARNING: CPU: 0 PID: 578 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   81.991135][  T578] Modules linked in: cls_flower act_mirred bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth
| [   81.992540][  T578] Tainted: [B]=BAD_PAGE
[   81.992749][  T578] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   81.993099][  T578] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   81.993457][  T578] Code: 7d 93 02 80 fb 01 0f 87 bb 99 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 a8 7d 93 02 01 90 48 c7 c7 60 8d 85 9a e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
All code
========
   0:	7d 93                	jge    0xffffffffffffff95
   2:	02 80 fb 01 0f 87    	add    -0x78f0fe05(%rax),%al
   8:	bb 99 d9 fe 83       	mov    $0x83fed999,%ebx
   d:	e3 01                	jrcxz  0x10
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 a8 7d 93 02 01 	movb   $0x1,0x2937da8(%rip)        # 0x2937dc4
  1c:	90                   	nop
  1d:	48 c7 c7 60 8d 85 9a 	mov    $0xffffffff9a858d60,%rdi
  24:	e8 32 bf 18 ff       	call   0xffffffffff18bf5b
  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 b0 63 a1 ff       	call   0xffffffffffa163eb
  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 b0 63 a1 ff       	call   0xffffffffffa163c1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   81.994434][  T578] RSP: 0018:ffffc900010e71f0 EFLAGS: 00010286
[   81.994789][  T578] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   81.995198][  T578] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   81.995612][  T578] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff363e134
[   81.996019][  T578] R10: 0000000000000003 R11: ffffc900010e6d80 R12: 0000000000000001
[   81.996457][  T578] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   81.996876][  T578] FS:  00007f0ffa1dc800(0000) GS:ffff888099bf2000(0000) knlGS:0000000000000000
[   81.997360][  T578] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   81.997732][  T578] CR2: 00005556857771b8 CR3: 000000000c500004 CR4: 0000000000772ef0
[   81.998150][  T578] PKRU: 55555554
[   81.998358][  T578] Call Trace:
[   81.998571][  T578]  <TASK>
[   81.998715][  T578]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   81.998999][  T578]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   81.999292][  T578]  ? generic_xdp_install (net/core/dev.c:11630)
[   81.999591][  T578]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   81.999877][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   82.000192][  T578]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   82.000495][  T578]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   82.000821][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   82.001025][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   82.001229][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   82.001420][  T578]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   82.001603][  T578]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   82.001806][  T578]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   82.002009][  T578]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   82.002219][  T578]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   82.002383][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   82.002558][  T578]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   82.002724][  T578]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   82.002886][  T578]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   82.003080][  T578]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   82.003249][  T578]  ? 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)
[   82.003419][  T578]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   82.003589][  T578]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   82.003755][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   82.003922][  T578]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   82.004086][  T578]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   82.004273][  T578]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   82.004445][  T578]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   82.004617][  T578]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   82.004792][  T578]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   82.004998][  T578]  ? __copy_msghdr (net/socket.c:2556)
[   82.005178][  T578]  ___sys_sendmsg (net/socket.c:2686)
[   82.005350][  T578]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   82.005518][  T578]  ? __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)
[   82.005733][  T578]  ? copy_msghdr_from_user (net/socket.c:2673)
[   82.005901][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   82.006065][  T578]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   82.006244][  T578]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   82.006406][  T578]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   82.006587][  T578]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   82.006759][  T578]  __sys_sendmsg (net/socket.c:2716)
[   82.006922][  T578]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   82.007143][  T578]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   82.007314][  T578]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   82.007522][  T578]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   82.007714][  T578]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   82.007914][  T578] RIP: 0033:0x7f0ffa3aa1d7
[   82.008084][  T578] 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)
[   82.008698][  T578] RSP: 002b:00007ffda6f35df8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   82.008951][  T578] RAX: ffffffffffffffda RBX: 00007ffda6f36520 RCX: 00007f0ffa3aa1d7
[   82.009209][  T578] RDX: 0000000000000000 RSI: 00007ffda6f35e60 RDI: 0000000000000005
[   82.009451][  T578] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   82.009708][  T578] R10: 00007f0ffa2a6f60 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