======================================
| [   20.124907][  T294] ==================================================================
| [   20.125338][  T294] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   20.125651][  T294] Read of size 1 at addr ffff8880056ac6c4 by task ip/294
| [   20.125953][  T294]
[   20.126060][  T294] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.126063][  T294] Call Trace:
[   20.126065][  T294]  <TASK>
[   20.126067][  T294]  dump_stack_lvl (lib/dump_stack.c:123)
[   20.126074][  T294]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   20.126081][  T294]  ? kobject_put (lib/kobject.c:733)
[   20.126085][  T294]  print_report (mm/kasan/report.c:483)
[   20.126088][  T294]  ? kobject_put (lib/kobject.c:733)
[   20.126091][  T294]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   20.126097][  T294]  ? kobject_put (lib/kobject.c:733)
[   20.126102][  T294]  kasan_report (mm/kasan/report.c:597)
[   20.126108][  T294]  ? kobject_put (lib/kobject.c:733)
[   20.126117][  T294]  kobject_put (lib/kobject.c:733)
[   20.126122][  T294]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   20.126130][  T294]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   20.126136][  T294]  ? generic_xdp_install (net/core/dev.c:11630)
[   20.126140][  T294]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   20.126146][  T294]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   20.126153][  T294]  ? net_generic (./include/net/netns/generic.h:51)
[   20.126160][  T294]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   20.126170][  T294]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   20.126203][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.126212][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.126222][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.126229][  T294]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   20.126233][  T294]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.126239][  T294]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   20.126244][  T294]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   20.126251][  T294]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   20.126256][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.126269][  T294]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   20.126276][  T294]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   20.126283][  T294]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   20.126295][  T294]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   20.126300][  T294]  ? 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)
[   20.126307][  T294]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   20.126314][  T294]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   20.126320][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.126327][  T294]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   20.126333][  T294]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   20.126336][  T294]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   20.126341][  T294]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   20.126344][  T294]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   20.126348][  T294]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   20.126351][  T294]  ? __copy_msghdr (net/socket.c:2556)
[   20.126358][  T294]  ___sys_sendmsg (net/socket.c:2686)
[   20.126361][  T294]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   20.126365][  T294]  ? __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)
[   20.126369][  T294]  ? copy_msghdr_from_user (net/socket.c:2673)
[   20.126374][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.126379][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.126383][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.126387][  T294]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   20.126393][  T294]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.126398][  T294]  __sys_sendmsg (net/socket.c:2716)
[   20.126401][  T294]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   20.126404][  T294]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   20.126415][  T294]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   20.126424][  T294]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   20.126431][  T294]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   20.126436][  T294] RIP: 0033:0x7ff4fb41e1d7
[   20.126443][  T294] 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)
[   20.126446][  T294] RSP: 002b:00007fff860a8f28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   20.126450][  T294] RAX: ffffffffffffffda RBX: 00007fff860a9660 RCX: 00007ff4fb41e1d7
[   20.126453][  T294] RDX: 0000000000000000 RSI: 00007fff860a8f90 RDI: 0000000000000005
[   20.126454][  T294] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   20.126456][  T294] R10: 00007ff4fb31a510 R11: 0000000000000246 R12: 0000000000000002
[   20.126458][  T294] R13: 00000000690df12f R14: 0000000000499600 R15: 0000000000000000
| [   20.156659][  T294] refcount_t: underflow; use-after-free.
| [   20.156895][  T294] WARNING: CPU: 0 PID: 294 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   20.157206][  T294] Modules linked in: ip_gre gre
| [   20.157844][  T294] Tainted: [B]=BAD_PAGE
[   20.157981][  T294] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.158196][  T294] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   20.158426][  T294] 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 e5 ad 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 e5 ad 	mov    $0xffffffffade5ba40,%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
[   20.159091][  T294] RSP: 0018:ffffc900005f71f0 EFLAGS: 00010286
[   20.159312][  T294] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   20.159579][  T294] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   20.159872][  T294] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5dc0934
[   20.160142][  T294] R10: 0000000000000003 R11: ffffc900005f6d80 R12: 0000000000000001
[   20.160405][  T294] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   20.160714][  T294] FS:  00007ff4fb250800(0000) GS:ffff8880bcd08000(0000) knlGS:0000000000000000
[   20.161053][  T294] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.161281][  T294] CR2: 000055d1187dadec CR3: 000000000b42b002 CR4: 0000000000772ef0
[   20.161556][  T294] PKRU: 55555554
[   20.161735][  T294] Call Trace:
[   20.161881][  T294]  <TASK>
[   20.161970][  T294]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   20.162174][  T294]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   20.162351][  T294]  ? generic_xdp_install (net/core/dev.c:11630)
[   20.162539][  T294]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   20.162780][  T294]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   20.162972][  T294]  ? net_generic (./include/net/netns/generic.h:51)
[   20.163155][  T294]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   20.163337][  T294]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   20.163584][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.163815][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.163997][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.164194][  T294]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   20.164381][  T294]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.164566][  T294]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   20.164850][  T294]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   20.165030][  T294]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   20.165204][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.165380][  T294]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   20.165577][  T294]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   20.165814][  T294]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   20.165988][  T294]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   20.166156][  T294]  ? 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)
[   20.166322][  T294]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   20.166508][  T294]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   20.166703][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.166902][  T294]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   20.167084][  T294]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   20.167259][  T294]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   20.167443][  T294]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   20.167622][  T294]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   20.167847][  T294]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   20.168066][  T294]  ? __copy_msghdr (net/socket.c:2556)
[   20.168242][  T294]  ___sys_sendmsg (net/socket.c:2686)
[   20.168421][  T294]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   20.168620][  T294]  ? __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)
[   20.168896][  T294]  ? copy_msghdr_from_user (net/socket.c:2673)
[   20.169136][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.169314][  T294]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   20.169503][  T294]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   20.169706][  T294]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   20.169908][  T294]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.170097][  T294]  __sys_sendmsg (net/socket.c:2716)
[   20.170272][  T294]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   20.170541][  T294]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   20.170748][  T294]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   20.170963][  T294]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   20.171137][  T294]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   20.171346][  T294] RIP: 0033:0x7ff4fb41e1d7
[   20.171545][  T294] 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)
[   20.172292][  T294] RSP: 002b:00007fff860a8f28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   20.172668][  T294] RAX: ffffffffffffffda RBX: 00007fff860a9660 RCX: 00007ff4fb41e1d7
[   20.173080][  T294] RDX: 0000000000000000 RSI: 00007fff860a8f90 RDI: 0000000000000005
[   20.173426][  T294] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   20.173834][  T294] R10: 00007ff4fb31a510 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