======================================
| [   51.576863][  T512] ==================================================================
| [   51.577228][  T512] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   51.577557][  T512] Read of size 1 at addr ffff88800af026ac by task ip/512
| [   51.577835][  T512]
[   51.577941][  T512] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   51.577943][  T512] Call Trace:
[   51.577945][  T512]  <TASK>
[   51.577947][  T512]  dump_stack_lvl (lib/dump_stack.c:123)
[   51.577953][  T512]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   51.577961][  T512]  ? kobject_put (lib/kobject.c:733)
[   51.577965][  T512]  print_report (mm/kasan/report.c:483)
[   51.577968][  T512]  ? kobject_put (lib/kobject.c:733)
[   51.577971][  T512]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   51.577974][  T512]  ? kobject_put (lib/kobject.c:733)
[   51.577977][  T512]  kasan_report (mm/kasan/report.c:597)
[   51.577981][  T512]  ? kobject_put (lib/kobject.c:733)
[   51.577986][  T512]  kobject_put (lib/kobject.c:733)
[   51.577990][  T512]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   51.577994][  T512]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   51.577998][  T512]  ? generic_xdp_install (net/core/dev.c:11630)
[   51.578000][  T512]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   51.578006][  T512]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   51.578013][  T512]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   51.578052][  T512]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   51.578059][  T512]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.578077][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.578083][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.578089][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.578092][  T512]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   51.578095][  T512]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.578099][  T512]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.578102][  T512]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   51.578106][  T512]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.578108][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.578115][  T512]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   51.578119][  T512]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.578122][  T512]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   51.578129][  T512]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   51.578131][  T512]  ? 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)
[   51.578135][  T512]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   51.578139][  T512]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   51.578143][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.578148][  T512]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   51.578153][  T512]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.578156][  T512]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   51.578161][  T512]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.578165][  T512]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   51.578172][  T512]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   51.578175][  T512]  ? __copy_msghdr (net/socket.c:2556)
[   51.578183][  T512]  ___sys_sendmsg (net/socket.c:2686)
[   51.578186][  T512]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   51.578189][  T512]  ? __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)
[   51.578196][  T512]  ? copy_msghdr_from_user (net/socket.c:2673)
[   51.578201][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.578205][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.578211][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.578214][  T512]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   51.578219][  T512]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.578225][  T512]  __sys_sendmsg (net/socket.c:2716)
[   51.578229][  T512]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   51.578232][  T512]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   51.578240][  T512]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   51.578247][  T512]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   51.578255][  T512]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   51.578265][  T512] RIP: 0033:0x7f222b7811d7
[   51.578270][  T512] 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)
[   51.578273][  T512] RSP: 002b:00007ffcdf36e208 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   51.578277][  T512] RAX: ffffffffffffffda RBX: 00007ffcdf36e930 RCX: 00007f222b7811d7
[   51.578280][  T512] RDX: 0000000000000000 RSI: 00007ffcdf36e270 RDI: 0000000000000005
[   51.578281][  T512] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   51.578283][  T512] R10: 00007f222b67df60 R11: 0000000000000246 R12: 0000000000000002
[   51.578285][  T512] R13: 00000000690deeab R14: 0000000000499600 R15: 0000000000000000
| [   51.616268][  T512] refcount_t: underflow; use-after-free.
| [   51.616491][  T512] WARNING: CPU: 3 PID: 512 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   51.617051][  T512] Modules linked in: act_gact act_pedit cls_flower bridge stp llc sch_ingress vrf veth
| [   51.617836][  T512] Tainted: [B]=BAD_PAGE
[   51.617991][  T512] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   51.618326][  T512] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   51.618817][  T512] 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 c5 99 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 c5 99 	mov    $0xffffffff99c58d60,%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
[   51.619528][  T512] RSP: 0018:ffffc90000d671f0 EFLAGS: 00010286
[   51.619795][  T512] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   51.620193][  T512] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   51.620486][  T512] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff34be134
[   51.620781][  T512] R10: 0000000000000003 R11: ffffc90000d66d80 R12: 0000000000000001
[   51.621061][  T512] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   51.621438][  T512] FS:  00007f222b5b3800(0000) GS:ffff88809a972000(0000) knlGS:0000000000000000
[   51.621787][  T512] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   51.622025][  T512] CR2: 00000000004e68d0 CR3: 000000000fb2e003 CR4: 0000000000772ef0
[   51.622405][  T512] PKRU: 55555554
[   51.622546][  T512] Call Trace:
[   51.622702][  T512]  <TASK>
[   51.622802][  T512]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   51.623000][  T512]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   51.623281][  T512]  ? generic_xdp_install (net/core/dev.c:11630)
[   51.623475][  T512]  ? kernfs_put.part.0 (./arch/x86/include/asm/atomic.h:67 ./include/linux/atomic/atomic-arch-fallback.h:2278 ./include/linux/atomic/atomic-instrumented.h:1384 fs/kernfs/dir.c:595)
[   51.623678][  T512]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   51.623874][  T512]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   51.624197][  T512]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   51.624392][  T512]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.624654][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.624848][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.625136][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.625322][  T512]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   51.625515][  T512]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.625823][  T512]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   51.626055][  T512]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   51.626234][  T512]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.626428][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.626624][  T512]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   51.626813][  T512]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   51.626999][  T512]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   51.627180][  T512]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   51.627460][  T512]  ? 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)
[   51.627661][  T512]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   51.627858][  T512]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   51.628048][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.628323][  T512]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   51.628517][  T512]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.628716][  T512]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   51.628920][  T512]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   51.629217][  T512]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   51.629411][  T512]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   51.629658][  T512]  ? __copy_msghdr (net/socket.c:2556)
[   51.629849][  T512]  ___sys_sendmsg (net/socket.c:2686)
[   51.630133][  T512]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   51.630314][  T512]  ? __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)
[   51.630551][  T512]  ? copy_msghdr_from_user (net/socket.c:2673)
[   51.630756][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.631043][  T512]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   51.631224][  T512]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   51.631418][  T512]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   51.631604][  T512]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   51.631802][  T512]  __sys_sendmsg (net/socket.c:2716)
[   51.631989][  T512]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   51.632213][  T512]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   51.632401][  T512]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   51.632685][  T512]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   51.632878][  T512]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   51.633104][  T512] RIP: 0033:0x7f222b7811d7
[   51.633455][  T512] 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)
[   51.634331][  T512] RSP: 002b:00007ffcdf36e208 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   51.634824][  T512] RAX: ffffffffffffffda RBX: 00007ffcdf36e930 RCX: 00007f222b7811d7
[   51.635170][  T512] RDX: 0000000000000000 RSI: 00007ffcdf36e270 RDI: 0000000000000005
[   51.635601][  T512] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   51.636005][  T512] R10: 00007f222b67df60 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