======================================
| [  143.971570][  T629] ==================================================================
| [  143.972063][  T629] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  143.972506][  T629] Read of size 1 at addr ffff8880094a26ac by task ip/629
| [  143.972744][  T629]
[  143.972931][  T629] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  143.972934][  T629] Call Trace:
[  143.972938][  T629]  <TASK>
[  143.972941][  T629]  dump_stack_lvl (lib/dump_stack.c:123)
[  143.972953][  T629]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  143.972970][  T629]  ? kobject_put (lib/kobject.c:733)
[  143.972977][  T629]  print_report (mm/kasan/report.c:483)
[  143.972982][  T629]  ? kobject_put (lib/kobject.c:733)
[  143.972987][  T629]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  143.972993][  T629]  ? kobject_put (lib/kobject.c:733)
[  143.972998][  T629]  kasan_report (mm/kasan/report.c:597)
[  143.973005][  T629]  ? kobject_put (lib/kobject.c:733)
[  143.973014][  T629]  kobject_put (lib/kobject.c:733)
[  143.973020][  T629]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  143.973032][  T629]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  143.973038][  T629]  ? generic_xdp_install (net/core/dev.c:11630)
[  143.973042][  T629]  ? 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)
[  143.973055][  T629]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  143.973065][  T629]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  143.973127][  T629]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  143.973139][  T629]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  143.973176][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  143.973185][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  143.973194][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  143.973200][  T629]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  143.973205][  T629]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  143.973212][  T629]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  143.973218][  T629]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  143.973225][  T629]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  143.973230][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  143.973243][  T629]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  143.973254][  T629]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  143.973261][  T629]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  143.973274][  T629]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  143.973279][  T629]  ? 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)
[  143.973287][  T629]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  143.973294][  T629]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  143.973300][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  143.973309][  T629]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  143.973316][  T629]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  143.973321][  T629]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  143.973333][  T629]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  143.973339][  T629]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  143.973356][  T629]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  143.973362][  T629]  ? __copy_msghdr (net/socket.c:2556)
[  143.973379][  T629]  ___sys_sendmsg (net/socket.c:2686)
[  143.973384][  T629]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  143.973389][  T629]  ? __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)
[  143.973401][  T629]  ? copy_msghdr_from_user (net/socket.c:2673)
[  143.973410][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  143.973418][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  143.973429][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  143.973436][  T629]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  143.973448][  T629]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  143.973459][  T629]  __sys_sendmsg (net/socket.c:2716)
[  143.973464][  T629]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  143.973471][  T629]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  143.973485][  T629]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  143.973493][  T629]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  143.973503][  T629]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  143.973510][  T629] RIP: 0033:0x7fc173c141d7
[  143.973517][  T629] 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)
[  143.973523][  T629] RSP: 002b:00007fffb3c43608 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  143.973530][  T629] RAX: ffffffffffffffda RBX: 00007fffb3c43d30 RCX: 00007fc173c141d7
[  143.973535][  T629] RDX: 0000000000000000 RSI: 00007fffb3c43670 RDI: 0000000000000005
[  143.973537][  T629] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  143.973540][  T629] R10: 00007fc173b10f60 R11: 0000000000000246 R12: 0000000000000002
[  143.973543][  T629] R13: 00000000690dead5 R14: 0000000000499600 R15: 0000000000000000
| [  144.021730][  T629] refcount_t: underflow; use-after-free.
| [  144.021941][  T629] WARNING: CPU: 1 PID: 629 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  144.022515][  T629] Modules linked in: act_gact cls_flower sch_ingress bridge stp llc vrf veth
| [  144.023330][  T629] Tainted: [B]=BAD_PAGE
[  144.023466][  T629] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  144.023734][  T629] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  144.023955][  T629] 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 65 84 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 65 84 	mov    $0xffffffff84658d60,%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
[  144.024719][  T629] RSP: 0018:ffffc9000126f1f0 EFLAGS: 00010286
[  144.024956][  T629] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  144.025333][  T629] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  144.025603][  T629] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff09fe134
[  144.025869][  T629] R10: 0000000000000003 R11: ffffc9000126ed80 R12: 0000000000000001
[  144.026181][  T629] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  144.026463][  T629] FS:  00007fc173a46800(0000) GS:ffff8880afe72000(0000) knlGS:0000000000000000
[  144.026783][  T629] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  144.027033][  T629] CR2: 00000000004e68c8 CR3: 0000000011416001 CR4: 0000000000772ef0
[  144.027454][  T629] PKRU: 55555554
[  144.027589][  T629] Call Trace:
[  144.027725][  T629]  <TASK>
[  144.027829][  T629]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  144.028056][  T629]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  144.028323][  T629]  ? generic_xdp_install (net/core/dev.c:11630)
[  144.028492][  T629]  ? 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)
[  144.028678][  T629]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  144.028873][  T629]  ? br_dev_delete (net/bridge/br_if.c:397) bridge
[  144.029105][  T629]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  144.029299][  T629]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  144.029567][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  144.029807][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  144.030104][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  144.030295][  T629]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  144.030500][  T629]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  144.030706][  T629]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  144.031068][  T629]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  144.031264][  T629]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  144.031486][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  144.031779][  T629]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  144.031964][  T629]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  144.032145][  T629]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  144.032325][  T629]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  144.032592][  T629]  ? 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)
[  144.032769][  T629]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  144.032976][  T629]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  144.033169][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  144.033445][  T629]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  144.033618][  T629]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  144.033786][  T629]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  144.033966][  T629]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  144.034271][  T629]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  144.034460][  T629]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  144.034686][  T629]  ? __copy_msghdr (net/socket.c:2556)
[  144.034875][  T629]  ___sys_sendmsg (net/socket.c:2686)
[  144.035100][  T629]  ? kasan_record_aux_stack (mm/kasan/generic.c:559)
[  144.035295][  T629]  ? __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)
[  144.035524][  T629]  ? copy_msghdr_from_user (net/socket.c:2673)
[  144.035706][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  144.036033][  T629]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  144.036221][  T629]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  144.036441][  T629]  ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:979 ./include/linux/mmzone.h:2197 arch/x86/mm/physaddr.c:65)
[  144.036621][  T629]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  144.036938][  T629]  __sys_sendmsg (net/socket.c:2716)
[  144.037186][  T629]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3148)
[  144.037422][  T629]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  144.037680][  T629]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  144.038049][  T629]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  144.038326][  T629]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  144.038690][  T629] RIP: 0033:0x7fc173c141d7
[  144.039165][  T629] 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)
[  144.040212][  T629] RSP: 002b:00007fffb3c43608 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  144.040851][  T629] RAX: ffffffffffffffda RBX: 00007fffb3c43d30 RCX: 00007fc173c141d7
[  144.041275][  T629] RDX: 0000000000000000 RSI: 00007fffb3c43670 RDI: 0000000000000005
[  144.041878][  T629] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  144.042312][  T629] R10: 00007fc173b10f60 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