======================================
| [  155.520633][  T379] ==================================================================
| [  155.520985][  T379] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [  155.521293][  T379] Read of size 1 at addr ffff888013fdc6ac by task teamd/379
| [  155.521558][  T379]
[  155.521656][  T379] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  155.521659][  T379] Call Trace:
[  155.521663][  T379]  <TASK>
[  155.521664][  T379]  dump_stack_lvl (lib/dump_stack.c:123)
[  155.521671][  T379]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[  155.521679][  T379]  ? kobject_put (lib/kobject.c:733)
[  155.521683][  T379]  print_report (mm/kasan/report.c:483)
[  155.521687][  T379]  ? kobject_put (lib/kobject.c:733)
[  155.521693][  T379]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[  155.521697][  T379]  ? kobject_put (lib/kobject.c:733)
[  155.521701][  T379]  kasan_report (mm/kasan/report.c:597)
[  155.521707][  T379]  ? kobject_put (lib/kobject.c:733)
[  155.521715][  T379]  kobject_put (lib/kobject.c:733)
[  155.521719][  T379]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  155.521727][  T379]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  155.521730][  T379]  ? generic_xdp_install (net/core/dev.c:11630)
[  155.521733][  T379]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  155.521736][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.521746][  T379]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  155.521753][  T379]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  155.521784][  T379]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  155.521790][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.521795][  T379]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  155.521799][  T379]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  155.521802][  T379]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  155.521807][  T379]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  155.521810][  T379]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  155.521814][  T379]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  155.521817][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.521824][  T379]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  155.521832][  T379]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  155.521835][  T379]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  155.521842][  T379]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  155.521845][  T379]  ? 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)
[  155.521848][  T379]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  155.521853][  T379]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  155.521857][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.521862][  T379]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  155.521866][  T379]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  155.521872][  T379]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  155.521886][  T379]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  155.521891][  T379]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  155.521900][  T379]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  155.521903][  T379]  ? __copy_msghdr (net/socket.c:2556)
[  155.521911][  T379]  ___sys_sendmsg (net/socket.c:2686)
[  155.521916][  T379]  ? copy_msghdr_from_user (net/socket.c:2673)
[  155.521920][  T379]  ? do_pte_missing (mm/memory.c:6134)
[  155.521925][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.521931][  T379]  ? __handle_mm_fault (mm/memory.c:6318)
[  155.521934][  T379]  ? __pmd_alloc (mm/memory.c:6229)
[  155.521941][  T379]  ? lock_vma_under_rcu (mm/mmap_lock.c:226)
[  155.521944][  T379]  ? lock_vma_under_rcu (mm/mmap_lock.c:259)
[  155.521948][  T379]  __sys_sendmsg (net/socket.c:2716)
[  155.521952][  T379]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  155.521955][  T379]  ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1484 arch/x86/mm/fault.c:1532)
[  155.521964][  T379]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[  155.521974][  T379]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  155.521983][  T379]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  155.521988][  T379]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  155.521993][  T379] RIP: 0033:0x7f761c7ee1d7
[  155.522001][  T379] 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)
[  155.522005][  T379] RSP: 002b:00007ffd855cf388 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  155.522013][  T379] RAX: ffffffffffffffda RBX: 00000000304e7320 RCX: 00007f761c7ee1d7
[  155.522016][  T379] RDX: 0000000000000000 RSI: 00007ffd855cf3c0 RDI: 0000000000000005
[  155.522018][  T379] RBP: 00000000304e7230 R08: 0000000000000003 R09: 0000000000000000
[  155.522020][  T379] R10: 0000000000000020 R11: 0000000000000246 R12: 00000000304f5200
[  155.522022][  T379] R13: 00007ffd855cf3c0 R14: 0000000000000000 R15: 00007ffd855cf520
| [  155.550253][  T379] refcount_t: underflow; use-after-free.
| [  155.550499][  T379] WARNING: CPU: 2 PID: 379 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [  155.550848][  T379] Modules linked in: bridge stp llc vrf veth
| [  155.551696][  T379] Tainted: [B]=BAD_PAGE
[  155.551870][  T379] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  155.552224][  T379] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[  155.553132][  T379] 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 a1 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 a1 	mov    $0xffffffffa1258d60,%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
[  155.553893][  T379] RSP: 0018:ffffc900005f71f0 EFLAGS: 00010286
[  155.554222][  T379] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  155.554563][  T379] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[  155.554933][  T379] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff437e134
[  155.555286][  T379] R10: 0000000000000003 R11: ffffc900005f6d80 R12: 0000000000000001
[  155.555626][  T379] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[  155.556000][  T379] FS:  00007f761c6adb80(0000) GS:ffff8880932f2000(0000) knlGS:0000000000000000
[  155.556402][  T379] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  155.556696][  T379] CR2: 00007f18b82ceb70 CR3: 0000000009598006 CR4: 0000000000772ef0
[  155.557034][  T379] PKRU: 55555554
[  155.557192][  T379] Call Trace:
[  155.557349][  T379]  <TASK>
[  155.557459][  T379]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[  155.557655][  T379]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[  155.557875][  T379]  ? generic_xdp_install (net/core/dev.c:11630)
[  155.558088][  T379]  ? unregister_netdevice_many (net/core/dev.c:12241)
[  155.558271][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.558466][  T379]  rtnl_dellink (net/core/rtnetlink.c:3580)
[  155.558650][  T379]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  155.558921][  T379]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  155.559134][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.559319][  T379]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  155.559514][  T379]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[  155.559700][  T379]  ? __lock_release (kernel/locking/lockdep.c:5536)
[  155.559928][  T379]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[  155.560169][  T379]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[  155.560377][  T379]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  155.560566][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.560775][  T379]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  155.560982][  T379]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[  155.561192][  T379]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  155.561389][  T379]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[  155.561572][  T379]  ? 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)
[  155.561778][  T379]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  155.561990][  T379]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  155.562200][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.562397][  T379]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  155.562587][  T379]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  155.562799][  T379]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[  155.563013][  T379]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  155.563210][  T379]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[  155.563411][  T379]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[  155.563636][  T379]  ? __copy_msghdr (net/socket.c:2556)
[  155.563847][  T379]  ___sys_sendmsg (net/socket.c:2686)
[  155.564061][  T379]  ? copy_msghdr_from_user (net/socket.c:2673)
[  155.564246][  T379]  ? do_pte_missing (mm/memory.c:6134)
[  155.564443][  T379]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  155.564628][  T379]  ? __handle_mm_fault (mm/memory.c:6318)
[  155.564836][  T379]  ? __pmd_alloc (mm/memory.c:6229)
[  155.565053][  T379]  ? lock_vma_under_rcu (mm/mmap_lock.c:226)
[  155.565245][  T379]  ? lock_vma_under_rcu (mm/mmap_lock.c:259)
[  155.565441][  T379]  __sys_sendmsg (net/socket.c:2716)
[  155.565626][  T379]  ? __sys_sendmsg_sock (net/socket.c:2701)
[  155.565841][  T379]  ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1484 arch/x86/mm/fault.c:1532)
[  155.566059][  T379]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[  155.566351][  T379]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[  155.566537][  T379]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  155.566734][  T379]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  155.566986][  T379] RIP: 0033:0x7f761c7ee1d7
[  155.567300][  T379] 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)
[  155.568058][  T379] RSP: 002b:00007ffd855cf388 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  155.568336][  T379] RAX: ffffffffffffffda RBX: 00000000304e7320 RCX: 00007f761c7ee1d7
[  155.568610][  T379] RDX: 0000000000000000 RSI: 00007ffd855cf3c0 RDI: 0000000000000005
[  155.569019][  T379] RBP: 00000000304e7230 R08: 0000000000000003 R09: 0000000000000000
[  155.569297][  T379] R10: 0000000000000020 R11: 0000000000000246 R12: 00000000304f5200


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