======================================
| [   97.937000][  T621] ==================================================================
| [   97.937327][  T621] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   97.937629][  T621] Read of size 1 at addr ffff888009e326ac by task ip/621
| [   97.937859][  T621]
[   97.937963][  T621] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   97.937966][  T621] Call Trace:
[   97.937970][  T621]  <TASK>
[   97.937972][  T621]  dump_stack_lvl (lib/dump_stack.c:123)
[   97.937979][  T621]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   97.937985][  T621]  ? kobject_put (lib/kobject.c:733)
[   97.937989][  T621]  print_report (mm/kasan/report.c:483)
[   97.937991][  T621]  ? kobject_put (lib/kobject.c:733)
[   97.937995][  T621]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   97.937998][  T621]  ? kobject_put (lib/kobject.c:733)
[   97.938001][  T621]  kasan_report (mm/kasan/report.c:597)
[   97.938004][  T621]  ? kobject_put (lib/kobject.c:733)
[   97.938010][  T621]  kobject_put (lib/kobject.c:733)
[   97.938013][  T621]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   97.938020][  T621]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   97.938023][  T621]  ? generic_xdp_install (net/core/dev.c:11630)
[   97.938025][  T621]  ? 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)
[   97.938034][  T621]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   97.938040][  T621]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   97.938073][  T621]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   97.938078][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   97.938097][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.938107][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.938113][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.938116][  T621]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   97.938119][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   97.938123][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   97.938126][  T621]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   97.938130][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   97.938132][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.938139][  T621]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   97.938143][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   97.938146][  T621]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   97.938153][  T621]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   97.938155][  T621]  ? 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)
[   97.938159][  T621]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   97.938163][  T621]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   97.938167][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.938174][  T621]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   97.938182][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   97.938187][  T621]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   97.938199][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   97.938204][  T621]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   97.938212][  T621]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   97.938216][  T621]  ? __copy_msghdr (net/socket.c:2556)
[   97.938226][  T621]  ___sys_sendmsg (net/socket.c:2686)
[   97.938230][  T621]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   97.938233][  T621]  ? __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)
[   97.938243][  T621]  ? copy_msghdr_from_user (net/socket.c:2673)
[   97.938248][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.938252][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.938258][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.938261][  T621]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   97.938274][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   97.938285][  T621]  __sys_sendmsg (net/socket.c:2716)
[   97.938290][  T621]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   97.938295][  T621]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   97.938309][  T621]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   97.938315][  T621]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   97.938321][  T621]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   97.938326][  T621] RIP: 0033:0x7f75ba6aa1d7
[   97.938332][  T621] 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)
[   97.938335][  T621] RSP: 002b:00007ffeab8f89e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   97.938341][  T621] RAX: ffffffffffffffda RBX: 00007ffeab8f9110 RCX: 00007f75ba6aa1d7
[   97.938344][  T621] RDX: 0000000000000000 RSI: 00007ffeab8f8a50 RDI: 0000000000000005
[   97.938346][  T621] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   97.938347][  T621] R10: 00007f75ba5a6f60 R11: 0000000000000246 R12: 0000000000000002
[   97.938349][  T621] R13: 00000000690debdc R14: 0000000000499600 R15: 0000000000000000
| [   97.979661][  T621] refcount_t: underflow; use-after-free.
| [   97.979899][  T621] WARNING: CPU: 2 PID: 621 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   97.980637][  T621] Modules linked in: act_mirred cls_flower sch_ingress bridge stp llc 8021q vrf veth
| [   97.981424][  T621] Tainted: [B]=BAD_PAGE
[   97.981592][  T621] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   97.981846][  T621] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   97.982119][  T621] 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 65 98 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 65 98 	mov    $0xffffffff98658d60,%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
[   97.982800][  T621] RSP: 0018:ffffc900007171f0 EFLAGS: 00010286
[   97.983047][  T621] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   97.983343][  T621] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   97.983667][  T621] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff31fe134
[   97.983954][  T621] R10: 0000000000000003 R11: ffffc90000716d80 R12: 0000000000000001
[   97.984381][  T621] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   97.984699][  T621] FS:  00007f75ba4dc800(0000) GS:ffff88809bef2000(0000) knlGS:0000000000000000
[   97.985169][  T621] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   97.985427][  T621] CR2: 0000557c61cafdec CR3: 000000000966b006 CR4: 0000000000772ef0
[   97.985722][  T621] PKRU: 55555554
[   97.985875][  T621] Call Trace:
[   97.986129][  T621]  <TASK>
[   97.986269][  T621]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   97.986503][  T621]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   97.986712][  T621]  ? generic_xdp_install (net/core/dev.c:11630)
[   97.987000][  T621]  ? 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)
[   97.987249][  T621]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   97.987454][  T621]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   97.987677][  T621]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   97.987966][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   97.988306][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.988578][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.988832][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.989099][  T621]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   97.989438][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   97.989712][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   97.990016][  T621]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   97.990310][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   97.990575][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.990845][  T621]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   97.991108][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   97.991406][  T621]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   97.991672][  T621]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   97.991936][  T621]  ? 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)
[   97.992217][  T621]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   97.992486][  T621]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   97.992744][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.993017][  T621]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   97.993308][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   97.993577][  T621]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   97.993835][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   97.994094][  T621]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   97.994391][  T621]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   97.994706][  T621]  ? __copy_msghdr (net/socket.c:2556)
[   97.994988][  T621]  ___sys_sendmsg (net/socket.c:2686)
[   97.995283][  T621]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   97.995541][  T621]  ? __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)
[   97.995855][  T621]  ? copy_msghdr_from_user (net/socket.c:2673)
[   97.996111][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.996410][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   97.996672][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   97.996956][  T621]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   97.997248][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   97.997509][  T621]  __sys_sendmsg (net/socket.c:2716)
[   97.997765][  T621]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   97.998060][  T621]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   97.998359][  T621]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   97.998615][  T621]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   97.998878][  T621]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   97.999209][  T621] RIP: 0033:0x7f75ba6aa1d7
[   97.999492][  T621] 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)
[   98.000221][  T621] RSP: 002b:00007ffeab8f89e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   98.000584][  T621] RAX: ffffffffffffffda RBX: 00007ffeab8f9110 RCX: 00007f75ba6aa1d7
[   98.000925][  T621] RDX: 0000000000000000 RSI: 00007ffeab8f8a50 RDI: 0000000000000005
[   98.001296][  T621] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   98.001639][  T621] R10: 00007f75ba5a6f60 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