======================================
| xx__-> [   22.030896][  T233] ==================================================================
| [   22.031308][  T233] BUG: KASAN: out-of-bounds in kobject_put (lib/kobject.c:733)
| [   22.031552][  T233] Read of size 1 at addr ffff88800b5fc68c by task packetdrill/233
| [   22.031834][  T233]
[   22.031941][  T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.031944][  T233] Call Trace:
[   22.031946][  T233]  <TASK>
[   22.031948][  T233]  dump_stack_lvl (lib/dump_stack.c:123)
[   22.031955][  T233]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   22.031963][  T233]  ? kobject_put (lib/kobject.c:733)
[   22.031967][  T233]  print_report (mm/kasan/report.c:483)
[   22.031971][  T233]  ? kobject_put (lib/kobject.c:733)
[   22.031974][  T233]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   22.031979][  T233]  ? kobject_put (lib/kobject.c:733)
[   22.031983][  T233]  kasan_report (mm/kasan/report.c:597)
[   22.031989][  T233]  ? kobject_put (lib/kobject.c:733)
[   22.031996][  T233]  kobject_put (lib/kobject.c:733)
[   22.032001][  T233]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   22.032008][  T233]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   22.032012][  T233]  ? netif_state_change (./include/net/netdev_lock.h:72 ./include/net/netdev_lock.h:80 net/core/dev.c:1577)
[   22.032015][  T233]  ? call_netdevice_notifiers_info (net/core/dev.c:1576)
[   22.032018][  T233]  ? generic_xdp_install (net/core/dev.c:11630)
[   22.032023][  T233]  ? tun_chr_close (drivers/net/tun.c:638 drivers/net/tun.c:3436)
[   22.032030][  T233]  tun_chr_close (./include/net/sock.h:1990 drivers/net/tun.c:643 drivers/net/tun.c:3436)
[   22.032034][  T233]  __fput (fs/file_table.c:468)
[   22.032042][  T233]  fput_close_sync (fs/file_table.c:571)
[   22.032046][  T233]  ? alloc_file_clone (fs/file_table.c:571)
[   22.032050][  T233]  __x64_sys_close (fs/open.c:1592 fs/open.c:1574 fs/open.c:1574)
[   22.032054][  T233]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   22.032061][  T233]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   22.032066][  T233] RIP: 0033:0x4901eb
[   22.032071][  T233] 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
[   22.032074][  T233] RSP: 002b:00007ffd47392b00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[   22.032079][  T233] RAX: ffffffffffffffda RBX: 00007ffd47393060 RCX: 00000000004901eb
[   22.032081][  T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[   22.032083][  T233] RBP: 00007ffd47392b40 R08: 0000000000000000 R09: 0000000000000000
[   22.032085][  T233] R10: 000000000e22af70 R11: 0000000000000293 R12: 00007ffd47392fd8
[   22.032087][  T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
| [   22.047381][  T233] kobject: 'H' (ffff88800b5fc650): is not initialized, yet kobject_put() is being called.
| [   22.047786][  T233] WARNING: CPU: 0 PID: 233 at lib/kobject.c:734 kobject_put (lib/kobject.c:734 (discriminator 1))
| [   22.048088][  T233] Modules linked in:
| [   22.048671][  T233] Tainted: [B]=BAD_PAGE
[   22.048850][  T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.049110][  T233] RIP: 0010:kobject_put (lib/kobject.c:734 (discriminator 1))
[   22.049329][  T233] 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 8f 8c 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 8f 8c 	mov    $0xffffffff8c8f3020,%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
[   22.050024][  T233] RSP: 0018:ffffc90000aa7ce8 EFLAGS: 00010282
[   22.050321][  T233] RAX: 0000000000000000 RBX: ffff88800b5fc000 RCX: 0000000000000000
[   22.050619][  T233] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   22.050901][  T233] RBP: ffff88800b5fc650 R08: 0000000000000000 R09: fffffbfff19fe134
[   22.051197][  T233] R10: 0000000000000003 R11: ffffc90000aa7880 R12: 0000000000000001
[   22.051481][  T233] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   22.051774][  T233] FS:  000000000e20f3c0(0000) GS:ffff8880a7e1a000(0000) knlGS:0000000000000000
[   22.052135][  T233] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.052386][  T233] CR2: 00007fd52ea5e000 CR3: 000000000baa3006 CR4: 0000000000772ef0
[   22.052674][  T233] PKRU: 55555554
[   22.052821][  T233] Call Trace:
[   22.052981][  T233]  <TASK>
[   22.053083][  T233]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   22.053291][  T233]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   22.053484][  T233]  ? netif_state_change (./include/net/netdev_lock.h:72 ./include/net/netdev_lock.h:80 net/core/dev.c:1577)
[   22.053672][  T233]  ? call_netdevice_notifiers_info (net/core/dev.c:1576)
[   22.053910][  T233]  ? generic_xdp_install (net/core/dev.c:11630)
[   22.054105][  T233]  ? tun_chr_close (drivers/net/tun.c:638 drivers/net/tun.c:3436)
[   22.054309][  T233]  tun_chr_close (./include/net/sock.h:1990 drivers/net/tun.c:643 drivers/net/tun.c:3436)
[   22.054505][  T233]  __fput (fs/file_table.c:468)
[   22.054654][  T233]  fput_close_sync (fs/file_table.c:571)
[   22.054844][  T233]  ? alloc_file_clone (fs/file_table.c:571)
[   22.055038][  T233]  __x64_sys_close (fs/open.c:1592 fs/open.c:1574 fs/open.c:1574)
[   22.055251][  T233]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   22.055442][  T233]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   22.055679][  T233] RIP: 0033:0x4901eb
[   22.055851][  T233] 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
[   22.056551][  T233] RSP: 002b:00007ffd47392b00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[   22.056883][  T233] RAX: ffffffffffffffda RBX: 00007ffd47393060 RCX: 00000000004901eb
[   22.057245][  T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[   22.057634][  T233] RBP: 00007ffd47392b40 R08: 0000000000000000 R09: 0000000000000000
[   22.058044][  T233] R10: 000000000e22af70 R11: 0000000000000293 R12: 00007ffd47392fd8
[   22.058483][  T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
| [   22.088317][   T12] refcount_t: underflow; use-after-free.
| [   22.088670][   T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   22.089281][   T12] Modules linked in:
| [   22.090271][   T12] Tainted: [B]=BAD_PAGE, [W]=WARN
[   22.090595][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.090981][   T12] Workqueue: netns cleanup_net
[   22.091349][   T12] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   22.091740][   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 65 8c 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 65 8c 	mov    $0xffffffff8c658d20,%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
[   22.092460][   T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282
[   22.092725][   T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   22.093153][   T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   22.093553][   T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff19fe134
[   22.093974][   T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[   22.094498][   T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   22.094934][   T12] FS:  0000000000000000(0000) GS:ffff8880a7f1a000(0000) knlGS:0000000000000000
[   22.095486][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.095870][   T12] CR2: 000055b5808c8dec CR3: 000000000b96a006 CR4: 0000000000772ef0
[   22.096351][   T12] PKRU: 55555554
[   22.096602][   T12] Call Trace:
[   22.096855][   T12]  <TASK>
[   22.097035][   T12]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   22.097380][   T12]  ? net_generic (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48)
[   22.097723][   T12]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   22.098045][   T12]  ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21))
[   22.098370][   T12]  ? generic_xdp_install (net/core/dev.c:11630)
[   22.098714][   T12]  ops_undo_list (net/core/net_namespace.c:190 net/core/net_namespace.c:248)
[   22.099049][   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)
[   22.099386][   T12]  ? netns_get (net/core/net_namespace.c:223)
[   22.099710][   T12]  ? spin_bug (kernel/locking/spinlock_debug.c:114)
[   22.099963][   T12]  ? cleanup_net (./include/linux/list.h:191 net/core/net_namespace.c:693)
[   22.100308][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   22.100630][   T12]  cleanup_net (net/core/net_namespace.c:698)
[   22.100946][   T12]  ? net_passive_dec (net/core/net_namespace.c:660)
[   22.101271][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   22.101559][   T12]  process_one_work (kernel/workqueue.c:3268)
[   22.101823][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:3165)
[   22.102120][   T12]  ? assign_work (kernel/workqueue.c:1206)
[   22.102476][   T12]  worker_thread (kernel/workqueue.c:3340 kernel/workqueue.c:3427)
[   22.102841][   T12]  ? rescuer_thread (kernel/workqueue.c:3373)
[   22.103181][   T12]  kthread (kernel/kthread.c:463)
[   22.103418][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   22.103637][   T12]  ? ret_from_fork (arch/x86/kernel/process.c:157)
[   22.103854][   T12]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   22.104073][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   22.104311][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   22.104529][   T12]  ret_from_fork (arch/x86/kernel/process.c:164)
[   22.104747][   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