======================================
| [   66.984059][  T741] ==================================================================
| [   66.984516][  T741] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   66.984929][  T741] Read of size 1 at addr ffff88800b4d26ac by task ip/741
| [   66.985222][  T741]
[   66.985361][  T741] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   66.985364][  T741] Call Trace:
[   66.985367][  T741]  <TASK>
[   66.985369][  T741]  dump_stack_lvl (lib/dump_stack.c:123)
[   66.985376][  T741]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   66.985386][  T741]  ? kobject_put (lib/kobject.c:733)
[   66.985392][  T741]  print_report (mm/kasan/report.c:483)
[   66.985397][  T741]  ? kobject_put (lib/kobject.c:733)
[   66.985401][  T741]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   66.985405][  T741]  ? kobject_put (lib/kobject.c:733)
[   66.985409][  T741]  kasan_report (mm/kasan/report.c:597)
[   66.985415][  T741]  ? kobject_put (lib/kobject.c:733)
[   66.985423][  T741]  kobject_put (lib/kobject.c:733)
[   66.985428][  T741]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   66.985446][  T741]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   66.985450][  T741]  ? generic_xdp_install (net/core/dev.c:11630)
[   66.985454][  T741]  ? 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)
[   66.985463][  T741]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   66.985471][  T741]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   66.985526][  T741]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   66.985535][  T741]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   66.985567][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.985577][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.985586][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.985591][  T741]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   66.985595][  T741]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   66.985601][  T741]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   66.985606][  T741]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   66.985612][  T741]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   66.985616][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.985626][  T741]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   66.985631][  T741]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   66.985637][  T741]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   66.985647][  T741]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   66.985651][  T741]  ? 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)
[   66.985657][  T741]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   66.985663][  T741]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   66.985669][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.985677][  T741]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   66.985684][  T741]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   66.985689][  T741]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   66.985699][  T741]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   66.985704][  T741]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   66.985711][  T741]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   66.985715][  T741]  ? __copy_msghdr (net/socket.c:2556)
[   66.985726][  T741]  ___sys_sendmsg (net/socket.c:2686)
[   66.985730][  T741]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   66.985734][  T741]  ? __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)
[   66.985744][  T741]  ? copy_msghdr_from_user (net/socket.c:2673)
[   66.985752][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.985758][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   66.985767][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   66.985772][  T741]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   66.985779][  T741]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   66.985789][  T741]  __sys_sendmsg (net/socket.c:2716)
[   66.985793][  T741]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   66.985798][  T741]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   66.985810][  T741]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   66.985816][  T741]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   66.985823][  T741]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   66.985830][  T741] RIP: 0033:0x7f90111f11d7
[   66.985836][  T741] 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)
[   66.985842][  T741] RSP: 002b:00007ffc6df770a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   66.985851][  T741] RAX: ffffffffffffffda RBX: 00007ffc6df777d0 RCX: 00007f90111f11d7
[   66.985855][  T741] RDX: 0000000000000000 RSI: 00007ffc6df77110 RDI: 0000000000000005
[   66.985857][  T741] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   66.985859][  T741] R10: 00007f90110edf60 R11: 0000000000000246 R12: 0000000000000002
[   66.985862][  T741] R13: 00000000690df7f3 R14: 0000000000499600 R15: 0000000000000000
| [   67.028758][  T741] refcount_t: underflow; use-after-free.
| [   67.028967][  T741] WARNING: CPU: 3 PID: 741 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   67.029261][  T741] Modules linked in: act_gact act_pedit cls_flower bridge stp llc sch_ingress vrf veth
| [   67.030050][  T741] Tainted: [B]=BAD_PAGE
[   67.030183][  T741] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   67.030389][  T741] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   67.030596][  T741] 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 25 96 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 25 96 	mov    $0xffffffff96258d60,%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
[   67.031198][  T741] RSP: 0018:ffffc900013cf1f0 EFLAGS: 00010286
[   67.031409][  T741] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   67.031758][  T741] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   67.032015][  T741] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2d7e134
[   67.032367][  T741] R10: 0000000000000003 R11: ffffc900013ced80 R12: 0000000000000001
[   67.032613][  T741] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   67.032860][  T741] FS:  00007f9011023800(0000) GS:ffff88809e372000(0000) knlGS:0000000000000000
[   67.033156][  T741] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   67.033367][  T741] CR2: 00000000004e68d0 CR3: 000000000db9a005 CR4: 0000000000772ef0
[   67.033631][  T741] PKRU: 55555554
[   67.033904][  T741] Call Trace:
[   67.034056][  T741]  <TASK>
[   67.034175][  T741]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   67.034353][  T741]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   67.034525][  T741]  ? generic_xdp_install (net/core/dev.c:11630)
[   67.034700][  T741]  ? 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)
[   67.034983][  T741]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   67.035156][  T741]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   67.035355][  T741]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   67.035663][  T741]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   67.035918][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   67.036124][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   67.036316][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   67.036503][  T741]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   67.036693][  T741]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   67.036985][  T741]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   67.037221][  T741]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   67.037408][  T741]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   67.037700][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   67.037895][  T741]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   67.038182][  T741]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   67.038369][  T741]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   67.038563][  T741]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   67.038745][  T741]  ? 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)
[   67.039034][  T741]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   67.039223][  T741]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   67.039415][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   67.039613][  T741]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   67.039791][  T741]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   67.039980][  T741]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   67.040167][  T741]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   67.040355][  T741]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   67.040639][  T741]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   67.040876][  T741]  ? __copy_msghdr (net/socket.c:2556)
[   67.041067][  T741]  ___sys_sendmsg (net/socket.c:2686)
[   67.041253][  T741]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   67.041539][  T741]  ? __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)
[   67.041777][  T741]  ? copy_msghdr_from_user (net/socket.c:2673)
[   67.041982][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   67.042171][  T741]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   67.042459][  T741]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   67.042655][  T741]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   67.042847][  T741]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   67.043145][  T741]  __sys_sendmsg (net/socket.c:2716)
[   67.043339][  T741]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   67.043577][  T741]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   67.043765][  T741]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   67.043960][  T741]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   67.044160][  T741]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   67.044395][  T741] RIP: 0033:0x7f90111f11d7
[   67.044596][  T741] 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)
[   67.045378][  T741] RSP: 002b:00007ffc6df770a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   67.045790][  T741] RAX: ffffffffffffffda RBX: 00007ffc6df777d0 RCX: 00007f90111f11d7
[   67.046090][  T741] RDX: 0000000000000000 RSI: 00007ffc6df77110 RDI: 0000000000000005
[   67.046382][  T741] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   67.046761][  T741] R10: 00007f90110edf60 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