======================================
| [  116.678758][ T2120] ==================================================================
| [  116.679116][ T2120] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  116.679428][ T2120] Read of size 1 at addr ffff8880148f26ac by task ip/2120
| [  116.679649][ T2120]
[  116.679778][ T2120] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  116.679781][ T2120] Call Trace:
[  116.679783][ T2120]  <TASK>
[  116.679786][ T2120]  dump_stack_lvl (lib/dump_stack.c:123)
[  116.679793][ T2120]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  116.679800][ T2120]  ? kobject_put (lib/kobject.c:733)
[  116.679805][ T2120]  print_report (mm/kasan/report.c:483)
[  116.679807][ T2120]  ? kobject_put (lib/kobject.c:733)
[  116.679811][ T2120]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  116.679814][ T2120]  ? kobject_put (lib/kobject.c:733)
[  116.679817][ T2120]  kasan_report (mm/kasan/report.c:597)
[  116.679821][ T2120]  ? kobject_put (lib/kobject.c:733)
[  116.679827][ T2120]  kobject_put (lib/kobject.c:733)
[  116.679830][ T2120]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  116.679836][ T2120]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  116.679839][ T2120]  ? generic_xdp_install (net/core/dev.c:11630)
[  116.679842][ T2120]  ? 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)
[  116.679848][ T2120]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  116.679855][ T2120]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  116.679890][ T2120]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  116.679896][ T2120]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  116.679914][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.679922][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.679929][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.679933][ T2120]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  116.679935][ T2120]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  116.679940][ T2120]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  116.679944][ T2120]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  116.679947][ T2120]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  116.679950][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.679957][ T2120]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  116.679962][ T2120]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  116.679965][ T2120]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  116.679972][ T2120]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  116.679975][ T2120]  ? 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)
[  116.679978][ T2120]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  116.679982][ T2120]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  116.679986][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.679992][ T2120]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  116.679996][ T2120]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  116.680000][ T2120]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  116.680005][ T2120]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  116.680009][ T2120]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  116.680017][ T2120]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  116.680020][ T2120]  ? __copy_msghdr (net/socket.c:2556)
[  116.680027][ T2120]  ___sys_sendmsg (net/socket.c:2686)
[  116.680030][ T2120]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  116.680033][ T2120]  ? __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)
[  116.680042][ T2120]  ? copy_msghdr_from_user (net/socket.c:2673)
[  116.680047][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.680051][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.680057][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.680060][ T2120]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  116.680069][ T2120]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  116.680076][ T2120]  __sys_sendmsg (net/socket.c:2716)
[  116.680079][ T2120]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  116.680083][ T2120]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  116.680090][ T2120]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  116.680094][ T2120]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  116.680101][ T2120]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  116.680107][ T2120] RIP: 0033:0x7fe5231da1d7
[  116.680112][ T2120] 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)
[  116.680115][ T2120] RSP: 002b:00007ffcea0e2688 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  116.680120][ T2120] RAX: ffffffffffffffda RBX: 00007ffcea0e2db0 RCX: 00007fe5231da1d7
[  116.680122][ T2120] RDX: 0000000000000000 RSI: 00007ffcea0e26f0 RDI: 0000000000000005
[  116.680124][ T2120] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  116.680126][ T2120] R10: 00007fe5230d6f60 R11: 0000000000000246 R12: 0000000000000002
[  116.680129][ T2120] R13: 00000000690df0ee R14: 0000000000499600 R15: 0000000000000000
| [  116.720125][ T2120] refcount_t: underflow; use-after-free.
| [  116.720372][ T2120] WARNING: CPU: 0 PID: 2120 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  116.720714][ T2120] Modules linked in: bridge stp llc 8021q vrf veth
| [  116.721364][ T2120] Tainted: [B]=BAD_PAGE
[  116.721519][ T2120] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  116.721780][ T2120] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  116.722019][ T2120] 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 85 b5 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 85 b5 	mov    $0xffffffffb5858d60,%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
[  116.722678][ T2120] RSP: 0018:ffffc90003bb71f0 EFLAGS: 00010286
[  116.722889][ T2120] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  116.723168][ T2120] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  116.723409][ T2120] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6c3e134
[  116.723663][ T2120] R10: 0000000000000003 R11: ffffc90003bb6d80 R12: 0000000000000001
[  116.723957][ T2120] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  116.724231][ T2120] FS:  00007fe52300c800(0000) GS:ffff88807ebf2000(0000) knlGS:0000000000000000
[  116.724569][ T2120] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  116.724794][ T2120] CR2: 000055732125adec CR3: 0000000015487005 CR4: 0000000000772ef0
[  116.725064][ T2120] PKRU: 55555554
[  116.725187][ T2120] Call Trace:
[  116.725312][ T2120]  <TASK>
[  116.725397][ T2120]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  116.725571][ T2120]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  116.725747][ T2120]  ? generic_xdp_install (net/core/dev.c:11630)
[  116.725907][ T2120]  ? 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)
[  116.726089][ T2120]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  116.726269][ T2120]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  116.726486][ T2120]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  116.726679][ T2120]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  116.726901][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.727070][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.727337][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.727506][ T2120]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  116.727692][ T2120]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  116.727885][ T2120]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  116.728221][ T2120]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  116.728391][ T2120]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  116.728552][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.728858][ T2120]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  116.729030][ T2120]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  116.729193][ T2120]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  116.729371][ T2120]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  116.729643][ T2120]  ? 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)
[  116.729813][ T2120]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  116.729975][ T2120]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  116.730190][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.730447][ T2120]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  116.730625][ T2120]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  116.730845][ T2120]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  116.731076][ T2120]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  116.732881][ T2120]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  116.733201][ T2120]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  116.733524][ T2120]  ? __copy_msghdr (net/socket.c:2556)
[  116.733799][ T2120]  ___sys_sendmsg (net/socket.c:2686)
[  116.734090][ T2120]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  116.734358][ T2120]  ? __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)
[  116.734718][ T2120]  ? copy_msghdr_from_user (net/socket.c:2673)
[  116.734988][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.735261][ T2120]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  116.735529][ T2120]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  116.735808][ T2120]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  116.736086][ T2120]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  116.736363][ T2120]  __sys_sendmsg (net/socket.c:2716)
[  116.736648][ T2120]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  116.737004][ T2120]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  116.737280][ T2120]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  116.737562][ T2120]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  116.737856][ T2120]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  116.738175][ T2120] RIP: 0033:0x7fe5231da1d7
[  116.738453][ T2120] 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)
[  116.739374][ T2120] RSP: 002b:00007ffcea0e2688 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  116.739772][ T2120] RAX: ffffffffffffffda RBX: 00007ffcea0e2db0 RCX: 00007fe5231da1d7
[  116.740161][ T2120] RDX: 0000000000000000 RSI: 00007ffcea0e26f0 RDI: 0000000000000005
[  116.740531][ T2120] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  116.740930][ T2120] R10: 00007fe5230d6f60 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