======================================
| [   38.287797][  T434] ==================================================================
| [   38.288068][  T434] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   38.288346][  T434] Read of size 1 at addr ffff88800e9a96c4 by task ip/434
| [   38.288552][  T434]
[   38.288645][  T434] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   38.288649][  T434] Call Trace:
[   38.288653][  T434]  <TASK>
[   38.288655][  T434]  dump_stack_lvl (lib/dump_stack.c:123)
[   38.288663][  T434]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   38.288678][  T434]  ? kobject_put (lib/kobject.c:733)
[   38.288682][  T434]  print_report (mm/kasan/report.c:483)
[   38.288685][  T434]  ? kobject_put (lib/kobject.c:733)
[   38.288688][  T434]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   38.288692][  T434]  ? kobject_put (lib/kobject.c:733)
[   38.288695][  T434]  kasan_report (mm/kasan/report.c:597)
[   38.288699][  T434]  ? kobject_put (lib/kobject.c:733)
[   38.288704][  T434]  kobject_put (lib/kobject.c:733)
[   38.288709][  T434]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   38.288723][  T434]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   38.288727][  T434]  ? generic_xdp_install (net/core/dev.c:11630)
[   38.288730][  T434]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   38.288737][  T434]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   38.288743][  T434]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   38.288762][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.288775][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.288780][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.288784][  T434]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   38.288787][  T434]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   38.288791][  T434]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   38.288794][  T434]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   38.288798][  T434]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   38.288802][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.288808][  T434]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   38.288817][  T434]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   38.288821][  T434]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   38.288828][  T434]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   38.288830][  T434]  ? 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)
[   38.288834][  T434]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   38.288838][  T434]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   38.288841][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.288846][  T434]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   38.288850][  T434]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   38.288853][  T434]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   38.288866][  T434]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   38.288869][  T434]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   38.288876][  T434]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   38.288878][  T434]  ? __copy_msghdr (net/socket.c:2556)
[   38.288886][  T434]  ___sys_sendmsg (net/socket.c:2686)
[   38.288888][  T434]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   38.288892][  T434]  ? __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)
[   38.288898][  T434]  ? copy_msghdr_from_user (net/socket.c:2673)
[   38.288902][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.288907][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.288912][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.288916][  T434]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   38.288929][  T434]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   38.288934][  T434]  __sys_sendmsg (net/socket.c:2716)
[   38.288937][  T434]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   38.288939][  T434]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   38.288946][  T434]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   38.288952][  T434]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   38.288958][  T434]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   38.288966][  T434] RIP: 0033:0x7fe4af5831d7
[   38.288969][  T434] 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)
[   38.288974][  T434] RSP: 002b:00007ffda88eaee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   38.288980][  T434] RAX: ffffffffffffffda RBX: 00007ffda88eb610 RCX: 00007fe4af5831d7
[   38.288982][  T434] RDX: 0000000000000000 RSI: 00007ffda88eaf50 RDI: 0000000000000005
[   38.288984][  T434] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   38.288985][  T434] R10: 00007fe4af47ff60 R11: 0000000000000246 R12: 0000000000000001
[   38.288987][  T434] R13: 00000000690e0204 R14: 0000000000499600 R15: 0000000000000000
| [   38.316992][  T434] refcount_t: underflow; use-after-free.
| [   38.317244][  T434] WARNING: CPU: 3 PID: 434 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   38.317569][  T434] Modules linked in: openvswitch psample nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nsh
| [   38.318298][  T434] Tainted: [B]=BAD_PAGE
[   38.318443][  T434] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   38.318773][  T434] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   38.319005][  T434] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 45 ac e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
All code
========
   0:	cc                   	int3
   1:	38 03                	cmp    %al,(%rbx)
   3:	80 fb 01             	cmp    $0x1,%bl
   6:	0f 87 29 33 d7 fe    	ja     0xfffffffffed73335
   c:	83 e3 01             	and    $0x1,%ebx
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 17 cc 38 03 01 	movb   $0x1,0x338cc17(%rip)        # 0x338cc33
  1c:	90                   	nop
  1d:	48 c7 c7 40 ba 45 ac 	mov    $0xffffffffac45ba40,%rdi
  24:	e8 62 d6 16 ff       	call   0xffffffffff16d68b
  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 c0 9d a0 ff       	call   0xffffffffffa09dfb
  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 c0 9d a0 ff       	call   0xffffffffffa09dd1
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   38.319738][  T434] RSP: 0018:ffffc90000cff1f0 EFLAGS: 00010286
[   38.319961][  T434] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   38.320326][  T434] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   38.320607][  T434] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5a80934
[   38.320883][  T434] R10: 0000000000000003 R11: ffffc90000cfed80 R12: 0000000000000001
[   38.321254][  T434] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   38.321525][  T434] FS:  00007fe4af3b5800(0000) GS:ffff8880be888000(0000) knlGS:0000000000000000
[   38.321838][  T434] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.322159][  T434] CR2: 00000000004e5dc0 CR3: 0000000016ca9001 CR4: 0000000000772ef0
[   38.322428][  T434] PKRU: 55555554
[   38.322574][  T434] Call Trace:
[   38.322801][  T434]  <TASK>
[   38.322895][  T434]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   38.323082][  T434]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   38.323265][  T434]  ? generic_xdp_install (net/core/dev.c:11630)
[   38.323446][  T434]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   38.323719][  T434]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   38.323898][  T434]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   38.324130][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.324309][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.324586][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.324763][  T434]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   38.324939][  T434]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   38.325106][  T434]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   38.325393][  T434]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   38.325560][  T434]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   38.325719][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.325974][  T434]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   38.326140][  T434]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   38.326297][  T434]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   38.326458][  T434]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   38.326715][  T434]  ? 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)
[   38.326878][  T434]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   38.327034][  T434]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   38.327190][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.327347][  T434]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   38.327509][  T434]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   38.327668][  T434]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   38.327827][  T434]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   38.327984][  T434]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   38.328141][  T434]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   38.328333][  T434]  ? __copy_msghdr (net/socket.c:2556)
[   38.328502][  T434]  ___sys_sendmsg (net/socket.c:2686)
[   38.328751][  T434]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   38.328909][  T434]  ? __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)
[   38.329107][  T434]  ? copy_msghdr_from_user (net/socket.c:2673)
[   38.329272][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.329446][  T434]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   38.329614][  T434]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   38.329769][  T434]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   38.329927][  T434]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   38.330185][  T434]  __sys_sendmsg (net/socket.c:2716)
[   38.330343][  T434]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   38.330542][  T434]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   38.330700][  T434]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   38.330948][  T434]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   38.331104][  T434]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   38.331294][  T434] RIP: 0033:0x7fe4af5831d7
[   38.331560][  T434] 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)
[   38.332117][  T434] RSP: 002b:00007ffda88eaee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   38.332458][  T434] RAX: ffffffffffffffda RBX: 00007ffda88eb610 RCX: 00007fe4af5831d7
[   38.332707][  T434] RDX: 0000000000000000 RSI: 00007ffda88eaf50 RDI: 0000000000000005
[   38.333061][  T434] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[   38.333309][  T434] R10: 00007fe4af47ff60 R11: 0000000000000246 R12: 0000000000000001


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