======================================
| [   23.286070][  T309] ==================================================================
| [   23.286654][  T309] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   23.287147][  T309] Read of size 1 at addr ffff888004eaa69c by task ip/309
| [   23.287546][  T309]
[   23.287717][  T309] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.287721][  T309] Call Trace:
[   23.287724][  T309]  <TASK>
[   23.287728][  T309]  dump_stack_lvl (lib/dump_stack.c:123)
[   23.287737][  T309]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   23.287747][  T309]  ? kobject_put (lib/kobject.c:733)
[   23.287753][  T309]  print_report (mm/kasan/report.c:483)
[   23.287758][  T309]  ? kobject_put (lib/kobject.c:733)
[   23.287762][  T309]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   23.287768][  T309]  ? kobject_put (lib/kobject.c:733)
[   23.287772][  T309]  kasan_report (mm/kasan/report.c:597)
[   23.287779][  T309]  ? kobject_put (lib/kobject.c:733)
[   23.287788][  T309]  kobject_put (lib/kobject.c:733)
[   23.287793][  T309]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   23.287805][  T309]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   23.287811][  T309]  ? generic_xdp_install (net/core/dev.c:11630)
[   23.287815][  T309]  ? 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)
[   23.287827][  T309]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   23.287835][  T309]  ? br_dev_delete (net/bridge/br_if.c:397)
[   23.287844][  T309]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   23.287854][  T309]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.287894][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.287905][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.287916][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.287923][  T309]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   23.287927][  T309]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.287935][  T309]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.287942][  T309]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   23.287949][  T309]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.287954][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.287968][  T309]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   23.287974][  T309]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.287981][  T309]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   23.287994][  T309]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   23.288002][  T309]  ? 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)
[   23.288010][  T309]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   23.288018][  T309]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   23.288024][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.288034][  T309]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   23.288042][  T309]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.288048][  T309]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   23.288060][  T309]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.288066][  T309]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   23.288077][  T309]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   23.288082][  T309]  ? __copy_msghdr (net/socket.c:2556)
[   23.288095][  T309]  ___sys_sendmsg (net/socket.c:2686)
[   23.288100][  T309]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   23.288104][  T309]  ? __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)
[   23.288113][  T309]  ? copy_msghdr_from_user (net/socket.c:2673)
[   23.288121][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.288128][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.288139][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.288145][  T309]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   23.288153][  T309]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.288165][  T309]  __sys_sendmsg (net/socket.c:2716)
[   23.288169][  T309]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   23.288175][  T309]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   23.288189][  T309]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   23.288196][  T309]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   23.288205][  T309]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   23.288212][  T309] RIP: 0033:0x7faf745d61d7
[   23.288220][  T309] 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)
[   23.288226][  T309] RSP: 002b:00007ffc904fdd08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   23.288233][  T309] RAX: ffffffffffffffda RBX: 00007ffc904fe430 RCX: 00007faf745d61d7
[   23.288237][  T309] RDX: 0000000000000000 RSI: 00007ffc904fdd70 RDI: 0000000000000005
[   23.288240][  T309] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   23.288243][  T309] R10: 00007faf744d2f60 R11: 0000000000000246 R12: 0000000000000001
[   23.288247][  T309] R13: 00000000690dee3d R14: 0000000000499600 R15: 0000000000000000
| [   23.347538][  T309] refcount_t: underflow; use-after-free.
| [   23.347909][  T309] WARNING: CPU: 2 PID: 309 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   23.348527][  T309] Modules linked in:
| [   23.349438][  T309] Tainted: [B]=BAD_PAGE
[   23.349692][  T309] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.350079][  T309] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   23.350514][  T309] Code: a2 b5 02 80 fb 01 0f 87 db 6e d8 fe 83 e3 01 0f 85 51 ff ff ff c6 05 c2 a2 b5 02 01 90 48 c7 c7 60 a8 c5 a2 e8 72 c3 17 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 20 69 a0 ff e9 ba fe ff ff
All code
========
   0:	a2 b5 02 80 fb 01 0f 	movabs %al,0xdb870f01fb8002b5
   7:	87 db 
   9:	6e                   	outsb  %ds:(%rsi),(%dx)
   a:	d8 fe                	fdivr  %st(6),%st
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 c2 a2 b5 02 01 	movb   $0x1,0x2b5a2c2(%rip)        # 0x2b5a2de
  1c:	90                   	nop
  1d:	48 c7 c7 60 a8 c5 a2 	mov    $0xffffffffa2c5a860,%rdi
  24:	e8 72 c3 17 ff       	call   0xffffffffff17c39b
  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 20 69 a0 ff       	call   0xffffffffffa0695b
  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 20 69 a0 ff       	call   0xffffffffffa06931
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   23.351657][  T309] RSP: 0018:ffffc90000da71f0 EFLAGS: 00010286
[   23.352067][  T309] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   23.352557][  T309] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   23.353080][  T309] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff46be134
[   23.353567][  T309] R10: 0000000000000003 R11: ffffc90000da6d80 R12: 0000000000000001
[   23.354061][  T309] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   23.354565][  T309] FS:  00007faf74408800(0000) GS:ffff888091881000(0000) knlGS:0000000000000000
[   23.355169][  T309] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   23.355572][  T309] CR2: 00007f5db9df4930 CR3: 000000000cd90006 CR4: 0000000000772ef0
[   23.356089][  T309] PKRU: 55555554
[   23.356805][  T309] Call Trace:
[   23.357091][  T309]  <TASK>
[   23.357299][  T309]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   23.357670][  T309]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   23.358003][  T309]  ? generic_xdp_install (net/core/dev.c:11630)
[   23.358329][  T309]  ? 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)
[   23.358651][  T309]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   23.358968][  T309]  ? br_dev_delete (net/bridge/br_if.c:397)
[   23.359312][  T309]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   23.359641][  T309]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.360089][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.360425][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.360755][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.361076][  T309]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   23.361396][  T309]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.361732][  T309]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   23.362159][  T309]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   23.362491][  T309]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.362819][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.363163][  T309]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   23.363496][  T309]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   23.363825][  T309]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   23.365656][  T309]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   23.366011][  T309]  ? 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)
[   23.366400][  T309]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   23.366717][  T309]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   23.367040][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.367370][  T309]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   23.367689][  T309]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.368006][  T309]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   23.368364][  T309]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   23.368691][  T309]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   23.374975][  T309]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   23.375398][  T309]  ? __copy_msghdr (net/socket.c:2556)
[   23.375738][  T309]  ___sys_sendmsg (net/socket.c:2686)
[   23.376063][  T309]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   23.376467][  T309]  ? __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)
[   23.376878][  T309]  ? copy_msghdr_from_user (net/socket.c:2673)
[   23.377214][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.377579][  T309]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   23.377903][  T309]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   23.378240][  T309]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   23.378565][  T309]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   23.378902][  T309]  __sys_sendmsg (net/socket.c:2716)
[   23.379243][  T309]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   23.379646][  T309]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   23.379986][  T309]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   23.380342][  T309]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   23.380673][  T309]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   23.381093][  T309] RIP: 0033:0x7faf745d61d7
[   23.389375][  T309] 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)
[   23.390577][  T309] RSP: 002b:00007ffc904fdd08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   23.391083][  T309] RAX: ffffffffffffffda RBX: 00007ffc904fe430 RCX: 00007faf745d61d7
[   23.391571][  T309] RDX: 0000000000000000 RSI: 00007ffc904fdd70 RDI: 0000000000000005
[   23.392049][  T309] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   23.392535][  T309] R10: 00007faf744d2f60 R11: 0000000000000246 R12: 0000000000000001


Finger prints:
refcount_warn_saturate:netdev_run_todo:rtnl_dellink:rtnetlink_rcv_msg:netlink_rcv_skb
print_report:kasan_report:kobject_put:netdev_run_todo:rtnl_dellink