======================================
| [  201.853988][ T2842] ==================================================================
| [  201.854454][ T2842] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  201.854866][ T2842] Read of size 1 at addr ffff88800a8a96ac by task ip/2842
| [  201.855214][ T2842]
[  201.855365][ T2842] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  201.855371][ T2842] Call Trace:
[  201.855374][ T2842]  <TASK>
[  201.855377][ T2842]  dump_stack_lvl (lib/dump_stack.c:123)
[  201.855388][ T2842]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  201.855402][ T2842]  ? kobject_put (lib/kobject.c:733)
[  201.855410][ T2842]  print_report (mm/kasan/report.c:483)
[  201.855414][ T2842]  ? kobject_put (lib/kobject.c:733)
[  201.855419][ T2842]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  201.855425][ T2842]  ? kobject_put (lib/kobject.c:733)
[  201.855430][ T2842]  kasan_report (mm/kasan/report.c:597)
[  201.855436][ T2842]  ? kobject_put (lib/kobject.c:733)
[  201.855446][ T2842]  kobject_put (lib/kobject.c:733)
[  201.855452][ T2842]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  201.855460][ T2842]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  201.855466][ T2842]  ? generic_xdp_install (net/core/dev.c:11630)
[  201.855472][ T2842]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  201.855486][ T2842]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  201.855494][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.855508][ T2842]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  201.855517][ T2842]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  201.855555][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.855564][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.855574][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.855580][ T2842]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  201.855585][ T2842]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  201.855593][ T2842]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  201.855599][ T2842]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  201.855605][ T2842]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  201.855611][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.855624][ T2842]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  201.855631][ T2842]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  201.855637][ T2842]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  201.855650][ T2842]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  201.855655][ T2842]  ? 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)
[  201.855662][ T2842]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  201.855670][ T2842]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  201.855676][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.855686][ T2842]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  201.855695][ T2842]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  201.855702][ T2842]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  201.855712][ T2842]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  201.855718][ T2842]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  201.855732][ T2842]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  201.855737][ T2842]  ? __copy_msghdr (net/socket.c:2556)
[  201.855750][ T2842]  ___sys_sendmsg (net/socket.c:2686)
[  201.855756][ T2842]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  201.855761][ T2842]  ? __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)
[  201.855774][ T2842]  ? copy_msghdr_from_user (net/socket.c:2673)
[  201.855783][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.855791][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.855802][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.855808][ T2842]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  201.855817][ T2842]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  201.855829][ T2842]  __sys_sendmsg (net/socket.c:2716)
[  201.855834][ T2842]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  201.855840][ T2842]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  201.855853][ T2842]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  201.855860][ T2842]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  201.855869][ T2842]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  201.855876][ T2842] RIP: 0033:0x7fe220cef1d7
[  201.855886][ T2842] 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)
[  201.855891][ T2842] RSP: 002b:00007ffc71375598 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  201.855898][ T2842] RAX: ffffffffffffffda RBX: 00007ffc71375cc0 RCX: 00007fe220cef1d7
[  201.855902][ T2842] RDX: 0000000000000000 RSI: 00007ffc71375600 RDI: 0000000000000005
[  201.855905][ T2842] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  201.855908][ T2842] R10: 00007fe220bebf60 R11: 0000000000000246 R12: 0000000000000002
[  201.855911][ T2842] R13: 00000000690df3be R14: 0000000000499600 R15: 0000000000000000
| [  201.888560][ T2842] refcount_t: underflow; use-after-free.
| [  201.888964][ T2842] WARNING: CPU: 2 PID: 2842 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  201.889529][ T2842] Modules linked in: vrf veth
| [  201.890509][ T2842] Tainted: [B]=BAD_PAGE
[  201.890753][ T2842] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  201.891115][ T2842] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  201.891545][ T2842] 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 a2 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 a2 	mov    $0xffffffffa2258d60,%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
[  201.892617][ T2842] RSP: 0018:ffffc90003db71f0 EFLAGS: 00010286
[  201.892912][ T2842] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  201.893188][ T2842] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  201.893570][ T2842] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff457e134
[  201.893904][ T2842] R10: 0000000000000003 R11: ffffc90003db6d80 R12: 0000000000000001
[  201.894300][ T2842] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  201.894762][ T2842] FS:  00007fe220b21800(0000) GS:ffff88808c6f2000(0000) knlGS:0000000000000000
[  201.895286][ T2842] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  201.895672][ T2842] CR2: 00000000004061e9 CR3: 000000000e979002 CR4: 0000000000772ef0
[  201.896113][ T2842] PKRU: 55555554
[  201.896351][ T2842] Call Trace:
[  201.896786][ T2842]  <TASK>
[  201.896962][ T2842]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  201.897268][ T2842]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  201.897594][ T2842]  ? generic_xdp_install (net/core/dev.c:11630)
[  201.897902][ T2842]  ? vrf_dellink (drivers/net/vrf.c:1667) vrf
[  201.898391][ T2842]  ? vrf_map_unregister_dev (drivers/net/vrf.c:1667) vrf
[  201.898787][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.899090][ T2842]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  201.899576][ T2842]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  201.900001][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.900313][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.900653][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.901119][ T2842]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  201.901423][ T2842]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  201.901722][ T2842]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  201.902078][ T2842]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  201.902555][ T2842]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  201.902853][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.903152][ T2842]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  201.903459][ T2842]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  201.903932][ T2842]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  201.904168][ T2842]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  201.904362][ T2842]  ? 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)
[  201.904565][ T2842]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  201.904924][ T2842]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  201.905161][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.905466][ T2842]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  201.905770][ T2842]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  201.906252][ T2842]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  201.906574][ T2842]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  201.906871][ T2842]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  201.907173][ T2842]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  201.907736][ T2842]  ? __copy_msghdr (net/socket.c:2556)
[  201.908042][ T2842]  ___sys_sendmsg (net/socket.c:2686)
[  201.908340][ T2842]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  201.908856][ T2842]  ? __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)
[  201.909243][ T2842]  ? copy_msghdr_from_user (net/socket.c:2673)
[  201.909557][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.909863][ T2842]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  201.910340][ T2842]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  201.910656][ T2842]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  201.910957][ T2842]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  201.911260][ T2842]  __sys_sendmsg (net/socket.c:2716)
[  201.911749][ T2842]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  201.912116][ T2842]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  201.912431][ T2842]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  201.912734][ T2842]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  201.913214][ T2842]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  201.913585][ T2842] RIP: 0033:0x7fe220cef1d7
[  201.913915][ T2842] 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)
[  201.914916][ T2842] RSP: 002b:00007ffc71375598 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  201.915383][ T2842] RAX: ffffffffffffffda RBX: 00007ffc71375cc0 RCX: 00007fe220cef1d7
[  201.915815][ T2842] RDX: 0000000000000000 RSI: 00007ffc71375600 RDI: 0000000000000005
[  201.916237][ T2842] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  201.916847][ T2842] R10: 00007fe220bebf60 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