======================================
| [  344.247462][ T1551] ==================================================================
| [  344.247778][ T1551] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  344.248096][ T1551] Read of size 1 at addr ffff8880073f96ac by task ip/1551
| [  344.248349][ T1551]
[  344.248464][ T1551] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  344.248470][ T1551] Call Trace:
[  344.248476][ T1551]  <TASK>
[  344.248478][ T1551]  dump_stack_lvl (lib/dump_stack.c:123)
[  344.248486][ T1551]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  344.248506][ T1551]  ? kobject_put (lib/kobject.c:733)
[  344.248510][ T1551]  print_report (mm/kasan/report.c:483)
[  344.248514][ T1551]  ? kobject_put (lib/kobject.c:733)
[  344.248518][ T1551]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  344.248521][ T1551]  ? kobject_put (lib/kobject.c:733)
[  344.248525][ T1551]  kasan_report (mm/kasan/report.c:597)
[  344.248531][ T1551]  ? kobject_put (lib/kobject.c:733)
[  344.248541][ T1551]  kobject_put (lib/kobject.c:733)
[  344.248547][ T1551]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  344.248557][ T1551]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  344.248560][ T1551]  ? generic_xdp_install (net/core/dev.c:11630)
[  344.248564][ T1551]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  344.248573][ T1551]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  344.248580][ T1551]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  344.248598][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.248612][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.248618][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.248622][ T1551]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  344.248624][ T1551]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  344.248628][ T1551]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  344.248632][ T1551]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  344.248635][ T1551]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  344.248638][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.248645][ T1551]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  344.248651][ T1551]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  344.248655][ T1551]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  344.248662][ T1551]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  344.248666][ T1551]  ? 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)
[  344.248670][ T1551]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  344.248675][ T1551]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  344.248678][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.248684][ T1551]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  344.248688][ T1551]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  344.248692][ T1551]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  344.248705][ T1551]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  344.248708][ T1551]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  344.248719][ T1551]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  344.248724][ T1551]  ? __copy_msghdr (net/socket.c:2556)
[  344.248733][ T1551]  ___sys_sendmsg (net/socket.c:2686)
[  344.248736][ T1551]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  344.248739][ T1551]  ? __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)
[  344.248751][ T1551]  ? copy_msghdr_from_user (net/socket.c:2673)
[  344.248756][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.248760][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.248766][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.248770][ T1551]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  344.248784][ T1551]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  344.248790][ T1551]  __sys_sendmsg (net/socket.c:2716)
[  344.248793][ T1551]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  344.248797][ T1551]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  344.248805][ T1551]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  344.248809][ T1551]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  344.248814][ T1551]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  344.248823][ T1551] RIP: 0033:0x7fad0fed01d7
[  344.248828][ T1551] 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)
[  344.248831][ T1551] RSP: 002b:00007ffceb4254b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  344.248839][ T1551] RAX: ffffffffffffffda RBX: 00007ffceb425be0 RCX: 00007fad0fed01d7
[  344.248841][ T1551] RDX: 0000000000000000 RSI: 00007ffceb425520 RDI: 0000000000000005
[  344.248843][ T1551] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  344.248844][ T1551] R10: 00007fad0fdccf60 R11: 0000000000000246 R12: 0000000000000002
[  344.248846][ T1551] R13: 00000000690de868 R14: 0000000000499600 R15: 0000000000000000
| [  344.288870][ T1551] refcount_t: underflow; use-after-free.
| [  344.289113][ T1551] WARNING: CPU: 3 PID: 1551 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  344.289459][ T1551] Modules linked in: cls_flower act_mirred 8021q bridge stp llc ip6_gre ip6_tunnel tunnel6 act_gact cls_matchall ip_gre gre sch_ingress vrf veth
| [  344.290476][ T1551] Tainted: [B]=BAD_PAGE
[  344.290619][ T1551] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  344.290851][ T1551] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  344.291093][ T1551] 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 45 b8 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 45 b8 	mov    $0xffffffffb8458d60,%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
[  344.291843][ T1551] RSP: 0018:ffffc900027bf1f0 EFLAGS: 00010286
[  344.292175][ T1551] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  344.292458][ T1551] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  344.292728][ T1551] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff71be134
[  344.293108][ T1551] R10: 0000000000000003 R11: ffffc900027bed80 R12: 0000000000000001
[  344.293382][ T1551] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  344.293761][ T1551] FS:  00007fad0fd02800(0000) GS:ffff88807c172000(0000) knlGS:0000000000000000
[  344.294101][ T1551] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  344.294338][ T1551] CR2: 00000000004e6e70 CR3: 000000000f028006 CR4: 0000000000772ef0
[  344.294702][ T1551] PKRU: 55555554
[  344.294844][ T1551] Call Trace:
[  344.294982][ T1551]  <TASK>
[  344.295082][ T1551]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  344.295268][ T1551]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  344.295547][ T1551]  ? generic_xdp_install (net/core/dev.c:11630)
[  344.295725][ T1551]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  344.295915][ T1551]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  344.296096][ T1551]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  344.296434][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.296623][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.296804][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.296975][ T1551]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  344.297287][ T1551]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  344.297467][ T1551]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  344.297675][ T1551]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  344.297955][ T1551]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  344.298152][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.298341][ T1551]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  344.298519][ T1551]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  344.298784][ T1551]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  344.299041][ T1551]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  344.299257][ T1551]  ? 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)
[  344.299433][ T1551]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  344.299700][ T1551]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  344.299894][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.300076][ T1551]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  344.300244][ T1551]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  344.300520][ T1551]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  344.300702][ T1551]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  344.300889][ T1551]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  344.301066][ T1551]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  344.301385][ T1551]  ? __copy_msghdr (net/socket.c:2556)
[  344.301576][ T1551]  ___sys_sendmsg (net/socket.c:2686)
[  344.301754][ T1551]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  344.301995][ T1551]  ? __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)
[  344.302552][ T1551]  ? copy_msghdr_from_user (net/socket.c:2673)
[  344.302817][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.303011][ T1551]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  344.303191][ T1551]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  344.303402][ T1551]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  344.303690][ T1551]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  344.303905][ T1551]  __sys_sendmsg (net/socket.c:2716)
[  344.304089][ T1551]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  344.304544][ T1551]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  344.304733][ T1551]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  344.304933][ T1551]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  344.305171][ T1551]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  344.305507][ T1551] RIP: 0033:0x7fad0fed01d7
[  344.305705][ T1551] 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)
[  344.306614][ T1551] RSP: 002b:00007ffceb4254b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  344.307013][ T1551] RAX: ffffffffffffffda RBX: 00007ffceb425be0 RCX: 00007fad0fed01d7
[  344.307400][ T1551] RDX: 0000000000000000 RSI: 00007ffceb425520 RDI: 0000000000000005
[  344.307752][ T1551] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  344.308026][ T1551] R10: 00007fad0fdccf60 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