======================================
| xx__-> [   18.239726][  T231] ==================================================================
| [   18.240060][  T231] BUG: KASAN: out-of-bounds in kobject_put (lib/kobject.c:733)
| [   18.240267][  T231] Read of size 1 at addr ffff88800a27c68c by task packetdrill/231
| [   18.240502][  T231]
[   18.240610][  T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.240612][  T231] Call Trace:
[   18.240614][  T231]  <TASK>
[   18.240616][  T231]  dump_stack_lvl (lib/dump_stack.c:123)
[   18.240622][  T231]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   18.240631][  T231]  ? kobject_put (lib/kobject.c:733)
[   18.240634][  T231]  print_report (mm/kasan/report.c:483)
[   18.240638][  T231]  ? kobject_put (lib/kobject.c:733)
[   18.240641][  T231]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   18.240644][  T231]  ? kobject_put (lib/kobject.c:733)
[   18.240647][  T231]  kasan_report (mm/kasan/report.c:597)
[   18.240651][  T231]  ? kobject_put (lib/kobject.c:733)
[   18.240657][  T231]  kobject_put (lib/kobject.c:733)
[   18.240660][  T231]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.240667][  T231]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   18.240671][  T231]  ? netif_state_change (./include/net/netdev_lock.h:72 ./include/net/netdev_lock.h:80 net/core/dev.c:1577)
[   18.240674][  T231]  ? call_netdevice_notifiers_info (net/core/dev.c:1576)
[   18.240677][  T231]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.240681][  T231]  ? tun_chr_close (drivers/net/tun.c:638 drivers/net/tun.c:3436)
[   18.240689][  T231]  tun_chr_close (./include/net/sock.h:1990 drivers/net/tun.c:643 drivers/net/tun.c:3436)
[   18.240693][  T231]  __fput (fs/file_table.c:468)
[   18.240701][  T231]  fput_close_sync (fs/file_table.c:571)
[   18.240705][  T231]  ? alloc_file_clone (fs/file_table.c:571)
[   18.240709][  T231]  __x64_sys_close (fs/open.c:1592 fs/open.c:1574 fs/open.c:1574)
[   18.240713][  T231]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.240720][  T231]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.240724][  T231] RIP: 0033:0x4901eb
[   18.240728][  T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
All code
========
   0:	03 00                	add    (%rax),%eax
   2:	00 00                	add    %al,(%rax)
   4:	0f 05                	syscall
   6:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   c:	77 41                	ja     0x4f
   e:	c3                   	ret
   f:	48 83 ec 18          	sub    $0x18,%rsp
  13:	89 7c 24 0c          	mov    %edi,0xc(%rsp)
  17:	e8 c3 78 04 00       	call   0x478df
  1c:	8b 7c 24 0c          	mov    0xc(%rsp),%edi
  20:	41 89 c0             	mov    %eax,%r8d
  23:	b8 03 00 00 00       	mov    $0x3,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 35                	ja     0x67
  32:	44 89 c7             	mov    %r8d,%edi
  35:	89 44 24 0c          	mov    %eax,0xc(%rsp)
  39:	e8 21 79 04 00       	call   0x4795f
  3e:	8b                   	.byte 0x8b
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 35                	ja     0x3d
   8:	44 89 c7             	mov    %r8d,%edi
   b:	89 44 24 0c          	mov    %eax,0xc(%rsp)
   f:	e8 21 79 04 00       	call   0x47935
  14:	8b                   	.byte 0x8b
  15:	44                   	rex.R
[   18.240731][  T231] RSP: 002b:00007ffded0091b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[   18.240735][  T231] RAX: ffffffffffffffda RBX: 00007ffded009710 RCX: 00000000004901eb
[   18.240737][  T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[   18.240739][  T231] RBP: 00007ffded0091f0 R08: 0000000000000000 R09: 0000000000000000
[   18.240741][  T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffded009688
[   18.240742][  T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
| [   18.251612][  T231] kobject: '1u[]Í' (ffff88800a27c650): is not initialized, yet kobject_put() is being called.
| [   18.252073][  T231] WARNING: CPU: 3 PID: 231 at lib/kobject.c:734 kobject_put (lib/kobject.c:734 (discriminator 1))
| [   18.252316][  T231] Modules linked in:
| [   18.252788][  T231] Tainted: [B]=BAD_PAGE
[   18.252913][  T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.253131][  T231] RIP: 0010:kobject_put (lib/kobject.c:734 (discriminator 1))
[   18.253291][  T231] Code: b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 75 35 48 8b 75 00 48 89 ea 48 c7 c7 20 30 6f ae e8 42 dd f7 fd 90 <0f> 0b 90 90 eb 9b c3 4c 89 e7 5d be 03 00 00 00 41 5c e9 8a 1c df
All code
========
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (bad)
   8:	df 48 89             	fisttps -0x77(%rax)
   b:	ea                   	(bad)
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  14:	75 35                	jne    0x4b
  16:	48 8b 75 00          	mov    0x0(%rbp),%rsi
  1a:	48 89 ea             	mov    %rbp,%rdx
  1d:	48 c7 c7 20 30 6f ae 	mov    $0xffffffffae6f3020,%rdi
  24:	e8 42 dd f7 fd       	call   0xfffffffffdf7dd6b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	eb 9b                	jmp    0xffffffffffffffcb
  30:	c3                   	ret
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	5d                   	pop    %rbp
  35:	be 03 00 00 00       	mov    $0x3,%esi
  3a:	41 5c                	pop    %r12
  3c:	e9                   	.byte 0xe9
  3d:	8a 1c df             	mov    (%rdi,%rbx,8),%bl

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	eb 9b                	jmp    0xffffffffffffffa1
   6:	c3                   	ret
   7:	4c 89 e7             	mov    %r12,%rdi
   a:	5d                   	pop    %rbp
   b:	be 03 00 00 00       	mov    $0x3,%esi
  10:	41 5c                	pop    %r12
  12:	e9                   	.byte 0xe9
  13:	8a 1c df             	mov    (%rdi,%rbx,8),%bl
[   18.253840][  T231] RSP: 0018:ffffc90000af7ce8 EFLAGS: 00010282
[   18.254051][  T231] RAX: 0000000000000000 RBX: ffff88800a27c000 RCX: 0000000000000000
[   18.254280][  T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   18.254508][  T231] RBP: ffff88800a27c650 R08: 0000000000000000 R09: fffffbfff5dbe134
[   18.254743][  T231] R10: 0000000000000003 R11: ffffc90000af7880 R12: 0000000000000001
[   18.254987][  T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   18.255216][  T231] FS:  00000000384083c0(0000) GS:ffff88808619a000(0000) knlGS:0000000000000000
[   18.255483][  T231] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.255680][  T231] CR2: 00007fd24101a000 CR3: 000000000a2f6006 CR4: 0000000000772ef0
[   18.255914][  T231] PKRU: 55555554
[   18.256044][  T231] Call Trace:
[   18.256159][  T231]  <TASK>
[   18.256237][  T231]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.256396][  T231]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   18.256557][  T231]  ? netif_state_change (./include/net/netdev_lock.h:72 ./include/net/netdev_lock.h:80 net/core/dev.c:1577)
[   18.256710][  T231]  ? call_netdevice_notifiers_info (net/core/dev.c:1576)
[   18.256903][  T231]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.257065][  T231]  ? tun_chr_close (drivers/net/tun.c:638 drivers/net/tun.c:3436)
[   18.257221][  T231]  tun_chr_close (./include/net/sock.h:1990 drivers/net/tun.c:643 drivers/net/tun.c:3436)
[   18.257372][  T231]  __fput (fs/file_table.c:468)
[   18.257491][  T231]  fput_close_sync (fs/file_table.c:571)
[   18.257655][  T231]  ? alloc_file_clone (fs/file_table.c:571)
[   18.257811][  T231]  __x64_sys_close (fs/open.c:1592 fs/open.c:1574 fs/open.c:1574)
[   18.258012][  T231]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   18.258167][  T231]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   18.258355][  T231] RIP: 0033:0x4901eb
[   18.258477][  T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
All code
========
   0:	03 00                	add    (%rax),%eax
   2:	00 00                	add    %al,(%rax)
   4:	0f 05                	syscall
   6:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   c:	77 41                	ja     0x4f
   e:	c3                   	ret
   f:	48 83 ec 18          	sub    $0x18,%rsp
  13:	89 7c 24 0c          	mov    %edi,0xc(%rsp)
  17:	e8 c3 78 04 00       	call   0x478df
  1c:	8b 7c 24 0c          	mov    0xc(%rsp),%edi
  20:	41 89 c0             	mov    %eax,%r8d
  23:	b8 03 00 00 00       	mov    $0x3,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 35                	ja     0x67
  32:	44 89 c7             	mov    %r8d,%edi
  35:	89 44 24 0c          	mov    %eax,0xc(%rsp)
  39:	e8 21 79 04 00       	call   0x4795f
  3e:	8b                   	.byte 0x8b
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 35                	ja     0x3d
   8:	44 89 c7             	mov    %r8d,%edi
   b:	89 44 24 0c          	mov    %eax,0xc(%rsp)
   f:	e8 21 79 04 00       	call   0x47935
  14:	8b                   	.byte 0x8b
  15:	44                   	rex.R
[   18.259043][  T231] RSP: 002b:00007ffded0091b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[   18.259278][  T231] RAX: ffffffffffffffda RBX: 00007ffded009710 RCX: 00000000004901eb
[   18.259535][  T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[   18.259768][  T231] RBP: 00007ffded0091f0 R08: 0000000000000000 R09: 0000000000000000
[   18.260018][  T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffded009688
[   18.260245][  T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
| [   18.294313][   T12] refcount_t: underflow; use-after-free.
| [   18.294614][   T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   18.295243][   T12] Modules linked in:
| [   18.296095][   T12] Tainted: [B]=BAD_PAGE, [W]=WARN
[   18.296359][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.296688][   T12] Workqueue: netns cleanup_net
[   18.296998][   T12] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   18.297352][   T12] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d 45 ae 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:	3f                   	(bad)
   1:	92                   	xchg   %eax,%edx
   2:	02 80 fb 01 0f 87    	add    -0x78f0fe05(%rax),%al
   8:	bb b9 d9 fe 83       	mov    $0x83fed9b9,%ebx
   d:	e3 01                	jrcxz  0x10
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 5e 3f 92 02 01 	movb   $0x1,0x2923f5e(%rip)        # 0x2923f7a
  1c:	90                   	nop
  1d:	48 c7 c7 20 8d 45 ae 	mov    $0xffffffffae458d20,%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
[   18.298331][   T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[   18.298675][   T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   18.299082][   T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   18.299490][   T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff5dbe134
[   18.299919][   T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[   18.300317][   T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   18.300718][   T12] FS:  0000000000000000(0000) GS:ffff88808601a000(0000) knlGS:0000000000000000
[   18.301195][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.301567][   T12] CR2: 0000556e9dfe1dec CR3: 0000000002331002 CR4: 0000000000772ef0
[   18.301984][   T12] PKRU: 55555554
[   18.302185][   T12] Call Trace:
[   18.302391][   T12]  <TASK>
[   18.302534][   T12]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   18.302824][   T12]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   18.303100][   T12]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   18.303378][   T12]  ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21))
[   18.303647][   T12]  ? generic_xdp_install (net/core/dev.c:11630)
[   18.303933][   T12]  ops_undo_list (net/core/net_namespace.c:190 net/core/net_namespace.c:248)
[   18.304196][   T12]  ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116)
[   18.304474][   T12]  ? netns_get (net/core/net_namespace.c:223)
[   18.304748][   T12]  ? spin_bug (kernel/locking/spinlock_debug.c:114)
[   18.304974][   T12]  ? cleanup_net (./include/linux/list.h:191 net/core/net_namespace.c:693)
[   18.305243][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.305526][   T12]  cleanup_net (net/core/net_namespace.c:698)
[   18.305806][   T12]  ? net_passive_dec (net/core/net_namespace.c:660)
[   18.306092][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.306364][   T12]  process_one_work (kernel/workqueue.c:3268)
[   18.306652][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:3165)
[   18.306942][   T12]  ? assign_work (kernel/workqueue.c:1206)
[   18.307221][   T12]  worker_thread (kernel/workqueue.c:3340 kernel/workqueue.c:3427)
[   18.307490][   T12]  ? rescuer_thread (kernel/workqueue.c:3373)
[   18.307777][   T12]  kthread (kernel/kthread.c:463)
[   18.307998][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   18.308261][   T12]  ? ret_from_fork (arch/x86/kernel/process.c:157)
[   18.308529][   T12]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   18.308797][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   18.309084][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   18.309359][   T12]  ret_from_fork (arch/x86/kernel/process.c:164)
[   18.309626][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)


Finger prints:
refcount_warn_saturate:netdev_run_todo:ops_undo_list:cleanup_net:process_one_work
print_report:kasan_report:kobject_put:netdev_run_todo:tun_chr_close
kobject_put:netdev_run_todo:tun_chr_close:__fput:fput_close_sync