======================================
| [   91.017796][  T621] ==================================================================
| [   91.018149][  T621] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   91.018451][  T621] Read of size 1 at addr ffff88800b95a6ac by task ip/621
| [   91.018695][  T621]
[   91.018817][  T621] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   91.018819][  T621] Call Trace:
[   91.018822][  T621]  <TASK>
[   91.018824][  T621]  dump_stack_lvl (lib/dump_stack.c:123)
[   91.018831][  T621]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   91.018838][  T621]  ? kobject_put (lib/kobject.c:733)
[   91.018842][  T621]  print_report (mm/kasan/report.c:483)
[   91.018845][  T621]  ? kobject_put (lib/kobject.c:733)
[   91.018849][  T621]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   91.018852][  T621]  ? kobject_put (lib/kobject.c:733)
[   91.018855][  T621]  kasan_report (mm/kasan/report.c:597)
[   91.018859][  T621]  ? kobject_put (lib/kobject.c:733)
[   91.018864][  T621]  kobject_put (lib/kobject.c:733)
[   91.018868][  T621]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   91.018873][  T621]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   91.018876][  T621]  ? generic_xdp_install (net/core/dev.c:11630)
[   91.018879][  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)
[   91.018885][  T621]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   91.018892][  T621]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   91.018928][  T621]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   91.018934][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   91.018953][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.018961][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.018968][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.018972][  T621]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   91.018975][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   91.018980][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   91.018983][  T621]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   91.018986][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   91.018989][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.018996][  T621]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   91.019001][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   91.019005][  T621]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   91.019011][  T621]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   91.019014][  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)
[   91.019017][  T621]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   91.019022][  T621]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   91.019025][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.019031][  T621]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   91.019035][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   91.019038][  T621]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   91.019044][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   91.019048][  T621]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   91.019053][  T621]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   91.019056][  T621]  ? __copy_msghdr (net/socket.c:2556)
[   91.019063][  T621]  ___sys_sendmsg (net/socket.c:2686)
[   91.019066][  T621]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   91.019069][  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)
[   91.019075][  T621]  ? copy_msghdr_from_user (net/socket.c:2673)
[   91.019080][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.019084][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.019090][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.019093][  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)
[   91.019098][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   91.019105][  T621]  __sys_sendmsg (net/socket.c:2716)
[   91.019108][  T621]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   91.019111][  T621]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   91.019119][  T621]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   91.019123][  T621]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   91.019128][  T621]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   91.019133][  T621] RIP: 0033:0x7f50ede101d7
[   91.019140][  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)
[   91.019145][  T621] RSP: 002b:00007ffcb4b5fbc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   91.019151][  T621] RAX: ffffffffffffffda RBX: 00007ffcb4b602f0 RCX: 00007f50ede101d7
[   91.019155][  T621] RDX: 0000000000000000 RSI: 00007ffcb4b5fc30 RDI: 0000000000000005
[   91.019157][  T621] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   91.019159][  T621] R10: 00007f50edd0cf60 R11: 0000000000000246 R12: 0000000000000002
[   91.019162][  T621] R13: 00000000690df68d R14: 0000000000499600 R15: 0000000000000000
| [   91.060219][  T621] refcount_t: underflow; use-after-free.
| [   91.060647][  T621] WARNING: CPU: 1 PID: 621 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   91.061131][  T621] Modules linked in: act_mirred cls_flower sch_ingress bridge stp llc 8021q vrf veth
| [   91.061917][  T621] Tainted: [B]=BAD_PAGE
[   91.062171][  T621] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   91.062507][  T621] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   91.062767][  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 05 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 05 96 	mov    $0xffffffff96058d60,%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
[   91.063454][  T621] RSP: 0018:ffffc900006271f0 EFLAGS: 00010286
[   91.063709][  T621] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   91.063995][  T621] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   91.064281][  T621] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2d3e134
[   91.064587][  T621] R10: 0000000000000003 R11: ffffc90000626d80 R12: 0000000000000001
[   91.064877][  T621] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   91.065156][  T621] FS:  00007f50edc42800(0000) GS:ffff88809e472000(0000) knlGS:0000000000000000
[   91.065518][  T621] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   91.065777][  T621] CR2: 00005629f727cdec CR3: 0000000001da1002 CR4: 0000000000772ef0
[   91.066073][  T621] PKRU: 55555554
[   91.066214][  T621] Call Trace:
[   91.066366][  T621]  <TASK>
[   91.066476][  T621]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   91.066790][  T621]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   91.066984][  T621]  ? generic_xdp_install (net/core/dev.c:11630)
[   91.067168][  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)
[   91.067362][  T621]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   91.067677][  T621]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[   91.067906][  T621]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   91.068094][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   91.068334][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.068653][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.068859][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.069049][  T621]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   91.069236][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   91.069557][  T621]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   91.069801][  T621]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   91.069985][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   91.070170][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.070472][  T621]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   91.070674][  T621]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   91.070866][  T621]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   91.071070][  T621]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   91.071341][  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)
[   91.071553][  T621]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   91.071749][  T621]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   91.071938][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.072220][  T621]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   91.072412][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   91.072621][  T621]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   91.072814][  T621]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   91.073094][  T621]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   91.073279][  T621]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   91.073531][  T621]  ? __copy_msghdr (net/socket.c:2556)
[   91.073729][  T621]  ___sys_sendmsg (net/socket.c:2686)
[   91.074012][  T621]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   91.074197][  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)
[   91.074449][  T621]  ? copy_msghdr_from_user (net/socket.c:2673)
[   91.074748][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.074939][  T621]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   91.075121][  T621]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   91.075307][  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)
[   91.075615][  T621]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   91.075831][  T621]  __sys_sendmsg (net/socket.c:2716)
[   91.076027][  T621]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   91.076257][  T621]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   91.076452][  T621]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   91.076648][  T621]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   91.076849][  T621]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   91.077074][  T621] RIP: 0033:0x7f50ede101d7
[   91.077364][  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)
[   91.078176][  T621] RSP: 002b:00007ffcb4b5fbc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   91.078473][  T621] RAX: ffffffffffffffda RBX: 00007ffcb4b602f0 RCX: 00007f50ede101d7
[   91.078802][  T621] RDX: 0000000000000000 RSI: 00007ffcb4b5fc30 RDI: 0000000000000005
[   91.079190][  T621] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   91.079473][  T621] R10: 00007f50edd0cf60 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