======================================
| [   96.758572][  T601] ==================================================================
| [   96.758863][  T601] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   96.759113][  T601] Read of size 1 at addr ffff88800abc26ac by task ip/601
| [   96.759308][  T601]
[   96.759419][  T601] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   96.759425][  T601] Call Trace:
[   96.759429][  T601]  <TASK>
[   96.759431][  T601]  dump_stack_lvl (lib/dump_stack.c:123)
[   96.759439][  T601]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   96.759445][  T601]  ? kobject_put (lib/kobject.c:733)
[   96.759449][  T601]  print_report (mm/kasan/report.c:483)
[   96.759452][  T601]  ? kobject_put (lib/kobject.c:733)
[   96.759455][  T601]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   96.759458][  T601]  ? kobject_put (lib/kobject.c:733)
[   96.759462][  T601]  kasan_report (mm/kasan/report.c:597)
[   96.759465][  T601]  ? kobject_put (lib/kobject.c:733)
[   96.759470][  T601]  kobject_put (lib/kobject.c:733)
[   96.759474][  T601]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   96.759479][  T601]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   96.759482][  T601]  ? generic_xdp_install (net/core/dev.c:11630)
[   96.759485][  T601]  ? 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)
[   96.759493][  T601]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   96.759501][  T601]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   96.759547][  T601]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   96.759552][  T601]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   96.759572][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.759577][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.759583][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.759587][  T601]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   96.759589][  T601]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   96.759593][  T601]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   96.759597][  T601]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   96.759600][  T601]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   96.759603][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.759610][  T601]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   96.759613][  T601]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   96.759617][  T601]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   96.759623][  T601]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   96.759626][  T601]  ? 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)
[   96.759629][  T601]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   96.759633][  T601]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   96.759637][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.759642][  T601]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   96.759647][  T601]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   96.759650][  T601]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   96.759655][  T601]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   96.759659][  T601]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   96.759663][  T601]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   96.759666][  T601]  ? __copy_msghdr (net/socket.c:2556)
[   96.759673][  T601]  ___sys_sendmsg (net/socket.c:2686)
[   96.759677][  T601]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   96.759679][  T601]  ? __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)
[   96.759684][  T601]  ? copy_msghdr_from_user (net/socket.c:2673)
[   96.759689][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.759694][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.759699][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.759703][  T601]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   96.759707][  T601]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   96.759713][  T601]  __sys_sendmsg (net/socket.c:2716)
[   96.759716][  T601]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   96.759720][  T601]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   96.759727][  T601]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   96.759731][  T601]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   96.759736][  T601]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   96.759739][  T601] RIP: 0033:0x7f3e1d1861d7
[   96.759744][  T601] 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)
[   96.759747][  T601] RSP: 002b:00007ffefd3dad78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   96.759754][  T601] RAX: ffffffffffffffda RBX: 00007ffefd3db4a0 RCX: 00007f3e1d1861d7
[   96.759756][  T601] RDX: 0000000000000000 RSI: 00007ffefd3dade0 RDI: 0000000000000005
[   96.759758][  T601] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   96.759760][  T601] R10: 00007f3e1d082f60 R11: 0000000000000246 R12: 0000000000000002
[   96.759762][  T601] R13: 00000000690deb72 R14: 0000000000499600 R15: 0000000000000000
| [   96.804040][  T601] refcount_t: underflow; use-after-free.
| [   96.804243][  T601] WARNING: CPU: 0 PID: 601 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   96.804626][  T601] Modules linked in: act_gact cls_flower sch_ingress bridge stp llc 8021q vrf veth
| [   96.805327][  T601] Tainted: [B]=BAD_PAGE
[   96.805475][  T601] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   96.805706][  T601] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   96.805949][  T601] 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 8c 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 8c 	mov    $0xffffffff8c258d60,%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
[   96.806607][  T601] RSP: 0018:ffffc9000106f1f0 EFLAGS: 00010286
[   96.806830][  T601] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   96.807107][  T601] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   96.807370][  T601] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff197e134
[   96.807671][  T601] R10: 0000000000000003 R11: ffffc9000106ed80 R12: 0000000000000001
[   96.807942][  T601] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   96.808214][  T601] FS:  00007f3e1cfb8800(0000) GS:ffff8880a81f2000(0000) knlGS:0000000000000000
[   96.808560][  T601] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   96.808798][  T601] CR2: 00007f66a6052050 CR3: 000000000bdcc006 CR4: 0000000000772ef0
[   96.809066][  T601] PKRU: 55555554
[   96.809314][  T601] Call Trace:
[   96.809523][  T601]  <TASK>
[   96.809631][  T601]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   96.809832][  T601]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   96.810036][  T601]  ? generic_xdp_install (net/core/dev.c:11630)
[   96.810205][  T601]  ? 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)
[   96.810422][  T601]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   96.810611][  T601]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   96.810822][  T601]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   96.811008][  T601]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   96.811237][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.811433][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.811635][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.811809][  T601]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   96.811988][  T601]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   96.812164][  T601]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   96.812400][  T601]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   96.812595][  T601]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   96.812769][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.812952][  T601]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   96.813125][  T601]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   96.813294][  T601]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   96.813495][  T601]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   96.813689][  T601]  ? 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)
[   96.813861][  T601]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   96.814040][  T601]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   96.814212][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.814407][  T601]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   96.814624][  T601]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   96.814794][  T601]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   96.814973][  T601]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   96.815160][  T601]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   96.815329][  T601]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   96.815587][  T601]  ? __copy_msghdr (net/socket.c:2556)
[   96.815776][  T601]  ___sys_sendmsg (net/socket.c:2686)
[   96.815957][  T601]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   96.816130][  T601]  ? __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)
[   96.816345][  T601]  ? copy_msghdr_from_user (net/socket.c:2673)
[   96.816554][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.816746][  T601]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   96.816916][  T601]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   96.817091][  T601]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   96.817277][  T601]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   96.817472][  T601]  __sys_sendmsg (net/socket.c:2716)
[   96.817659][  T601]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   96.817872][  T601]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   96.818102][  T601]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   96.818311][  T601]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   96.818547][  T601]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   96.818787][  T601] RIP: 0033:0x7f3e1d1861d7
[   96.818977][  T601] 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)
[   96.819680][  T601] RSP: 002b:00007ffefd3dad78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   96.819955][  T601] RAX: ffffffffffffffda RBX: 00007ffefd3db4a0 RCX: 00007f3e1d1861d7
[   96.820207][  T601] RDX: 0000000000000000 RSI: 00007ffefd3dade0 RDI: 0000000000000005
[   96.820498][  T601] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   96.820769][  T601] R10: 00007f3e1d082f60 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