======================================
| [   56.880666][  T596] ==================================================================
| [   56.880977][  T596] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   56.881233][  T596] Read of size 1 at addr ffff8880020446c4 by task ip/596
| [   56.881432][  T596]
[   56.881530][  T596] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   56.881533][  T596] Call Trace:
[   56.881536][  T596]  <TASK>
[   56.881538][  T596]  dump_stack_lvl (lib/dump_stack.c:123)
[   56.881544][  T596]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   56.881552][  T596]  ? kobject_put (lib/kobject.c:733)
[   56.881556][  T596]  print_report (mm/kasan/report.c:483)
[   56.881559][  T596]  ? kobject_put (lib/kobject.c:733)
[   56.881562][  T596]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   56.881566][  T596]  ? kobject_put (lib/kobject.c:733)
[   56.881569][  T596]  kasan_report (mm/kasan/report.c:597)
[   56.881573][  T596]  ? kobject_put (lib/kobject.c:733)
[   56.881579][  T596]  kobject_put (lib/kobject.c:733)
[   56.881582][  T596]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   56.881589][  T596]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   56.881593][  T596]  ? generic_xdp_install (net/core/dev.c:11630)
[   56.881597][  T596]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   56.881607][  T596]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   56.881616][  T596]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   56.881638][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.881646][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.881652][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.881656][  T596]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   56.881659][  T596]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   56.881662][  T596]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   56.881666][  T596]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   56.881670][  T596]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   56.881674][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.881680][  T596]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   56.881685][  T596]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   56.881689][  T596]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   56.881695][  T596]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   56.881698][  T596]  ? 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)
[   56.881702][  T596]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   56.881706][  T596]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   56.881710][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.881714][  T596]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   56.881719][  T596]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   56.881722][  T596]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   56.881728][  T596]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   56.881731][  T596]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   56.881735][  T596]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   56.881738][  T596]  ? __copy_msghdr (net/socket.c:2556)
[   56.881745][  T596]  ___sys_sendmsg (net/socket.c:2686)
[   56.881747][  T596]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   56.881751][  T596]  ? __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)
[   56.881756][  T596]  ? copy_msghdr_from_user (net/socket.c:2673)
[   56.881760][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.881765][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.881769][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.881773][  T596]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   56.881780][  T596]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   56.881785][  T596]  __sys_sendmsg (net/socket.c:2716)
[   56.881788][  T596]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   56.881791][  T596]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   56.881798][  T596]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   56.881804][  T596]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   56.881810][  T596]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   56.881814][  T596] RIP: 0033:0x7f843d8dc1d7
[   56.881820][  T596] 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)
[   56.881823][  T596] RSP: 002b:00007ffce01736d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   56.881827][  T596] RAX: ffffffffffffffda RBX: 00007ffce0173e10 RCX: 00007f843d8dc1d7
[   56.881829][  T596] RDX: 0000000000000000 RSI: 00007ffce0173740 RDI: 0000000000000005
[   56.881831][  T596] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   56.881833][  T596] R10: 00007f843d7d8510 R11: 0000000000000246 R12: 0000000000000002
[   56.881835][  T596] R13: 00000000690dfbb6 R14: 0000000000499600 R15: 0000000000000000
| [   56.906913][  T596] refcount_t: underflow; use-after-free.
| [   56.907124][  T596] WARNING: CPU: 2 PID: 596 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   56.907424][  T596] Modules linked in:
| [   56.908045][  T596] Tainted: [B]=BAD_PAGE
[   56.908198][  T596] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   56.908417][  T596] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   56.908659][  T596] 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 05 9a 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 05 9a 	mov    $0xffffffff9a05ba40,%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
[   56.909376][  T596] RSP: 0018:ffffc900016e71f0 EFLAGS: 00010286
[   56.909623][  T596] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   56.909919][  T596] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   56.910274][  T596] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3600934
[   56.910553][  T596] R10: 0000000000000003 R11: ffffc900016e6d80 R12: 0000000000000001
[   56.910825][  T596] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   56.911177][  T596] FS:  00007f843d70e800(0000) GS:ffff8880d0c08000(0000) knlGS:0000000000000000
[   56.911482][  T596] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   56.911806][  T596] CR2: 00007fa53f92e000 CR3: 000000000cfcb004 CR4: 0000000000772ef0
[   56.912068][  T596] PKRU: 55555554
[   56.912209][  T596] Call Trace:
[   56.912350][  T596]  <TASK>
[   56.912464][  T596]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   56.912662][  T596]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   56.912842][  T596]  ? generic_xdp_install (net/core/dev.c:11630)
[   56.913021][  T596]  ? unregister_netdevice_many (net/core/dev.c:12241)
[   56.913202][  T596]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   56.913485][  T596]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   56.913729][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.913912][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.914184][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.914363][  T596]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   56.914553][  T596]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   56.914743][  T596]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   56.915058][  T596]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   56.915244][  T596]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   56.915420][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.915616][  T596]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   56.915897][  T596]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   56.916079][  T596]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   56.916260][  T596]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   56.916441][  T596]  ? 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)
[   56.916736][  T596]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   56.916915][  T596]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   56.917090][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.917270][  T596]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   56.917551][  T596]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   56.917742][  T596]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   56.917922][  T596]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   56.918100][  T596]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   56.918386][  T596]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   56.918614][  T596]  ? __copy_msghdr (net/socket.c:2556)
[   56.918802][  T596]  ___sys_sendmsg (net/socket.c:2686)
[   56.918987][  T596]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[   56.919262][  T596]  ? __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)
[   56.919487][  T596]  ? copy_msghdr_from_user (net/socket.c:2673)
[   56.919677][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.919866][  T596]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   56.920150][  T596]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   56.920328][  T596]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[   56.920519][  T596]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   56.920713][  T596]  __sys_sendmsg (net/socket.c:2716)
[   56.920987][  T596]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[   56.921203][  T596]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   56.921387][  T596]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   56.921686][  T596]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   56.921868][  T596]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   56.922082][  T596] RIP: 0033:0x7f843d8dc1d7
[   56.922272][  T596] 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)
[   56.922968][  T596] RSP: 002b:00007ffce01736d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   56.923324][  T596] RAX: ffffffffffffffda RBX: 00007ffce0173e10 RCX: 00007f843d8dc1d7
[   56.923592][  T596] RDX: 0000000000000000 RSI: 00007ffce0173740 RDI: 0000000000000005
[   56.923862][  T596] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   56.924219][  T596] R10: 00007f843d7d8510 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