======================================
| [  444.792048][ T4307] ------------[ cut here ]------------
| [  444.792341][ T4307] refcount_t: decrement hit 0; leaking memory.
| [  444.792596][ T4307] WARNING: lib/refcount.c:31 at refcount_warn_saturate+0x59/0xc0, CPU#2: python3/4307
| [  444.793174][ T4307] Modules linked in: netdevsim
[  444.793936][ T4307] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  444.794311][ T4307] RIP: 0010:refcount_warn_saturate (lib/refcount.c:31 (discriminator 6))
[  444.794555][ T4307] Code: 07 83 c0 03 38 d0 7c 04 84 d2 75 75 c7 03 00 00 00 c0 83 fd 02 74 5b 76 19 83 fd 03 74 45 83 fd 04 75 22 48 8d 3d 57 11 2f 03 <67> 48 0f b9 3a 5b 5d c3 85 ed 74 1e 48 8d 3d 54 11 2f 03 67 48 0f
All code
========
   0:	07                   	(bad)
   1:	83 c0 03             	add    $0x3,%eax
   4:	38 d0                	cmp    %dl,%al
   6:	7c 04                	jl     0xc
   8:	84 d2                	test   %dl,%dl
   a:	75 75                	jne    0x81
   c:	c7 03 00 00 00 c0    	movl   $0xc0000000,(%rbx)
  12:	83 fd 02             	cmp    $0x2,%ebp
  15:	74 5b                	je     0x72
  17:	76 19                	jbe    0x32
  19:	83 fd 03             	cmp    $0x3,%ebp
  1c:	74 45                	je     0x63
  1e:	83 fd 04             	cmp    $0x4,%ebp
  21:	75 22                	jne    0x45
  23:	48 8d 3d 57 11 2f 03 	lea    0x32f1157(%rip),%rdi        # 0x32f1181
  2a:*	67 48 0f b9 3a       	ud1    (%edx),%rdi		<-- trapping instruction
  2f:	5b                   	pop    %rbx
  30:	5d                   	pop    %rbp
  31:	c3                   	ret
  32:	85 ed                	test   %ebp,%ebp
  34:	74 1e                	je     0x54
  36:	48 8d 3d 54 11 2f 03 	lea    0x32f1154(%rip),%rdi        # 0x32f1191
  3d:	67                   	addr32
  3e:	48                   	rex.W
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	67 48 0f b9 3a       	ud1    (%edx),%rdi
   5:	5b                   	pop    %rbx
   6:	5d                   	pop    %rbp
   7:	c3                   	ret
   8:	85 ed                	test   %ebp,%ebp
   a:	74 1e                	je     0x2a
   c:	48 8d 3d 54 11 2f 03 	lea    0x32f1154(%rip),%rdi        # 0x32f1167
  13:	67                   	addr32
  14:	48                   	rex.W
  15:	0f                   	.byte 0xf
[  444.795217][ T4307] RSP: 0018:ffa0000007e07508 EFLAGS: 00010246
[  444.795456][ T4307] RAX: 0000000000000003 RBX: ff1100001c552608 RCX: 0000000000000001
[  444.795760][ T4307] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffaa6b8f00
[  444.796037][ T4307] RBP: 0000000000000004 R08: ffffffffa73c7d65 R09: 1fe22000038aa4c1
[  444.796308][ T4307] R10: ffe21c00038aa4c2 R11: ffe21c00038aa4c2 R12: 1ff4000000fc0ea8
[  444.796579][ T4307] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000002
[  444.796867][ T4307] FS:  00007ff7dc7a9400(0000) GS:ff1100008a463000(0000) knlGS:0000000000000000
[  444.797173][ T4307] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  444.797409][ T4307] CR2: 00007ff7dbef1160 CR3: 000000001d6d0003 CR4: 0000000000771ef0
[  444.797781][ T4307] PKRU: 55555554
[  444.798078][ T4307] Call Trace:
[  444.798294][ T4307]  <TASK>
[  444.798476][ T4307]  ref_tracker_free (./include/linux/refcount.h:461 ./include/linux/refcount.h:476 lib/ref_tracker.c:298)
[  444.798751][ T4307]  ? ref_tracker_alloc (lib/ref_tracker.c:288)
[  444.799042][ T4307]  ? kfree (mm/slub.c:6165 (discriminator 3) mm/slub.c:6483 (discriminator 3))
[  444.799284][ T4307]  udp_tunnel_nic_unregister (./include/linux/netdevice.h:4431 (discriminator 31) ./include/linux/netdevice.h:4492 (discriminator 31) ./include/linux/netdevice.h:4517 (discriminator 31) net/ipv4/udp_tunnel_nic.c:913 (discriminator 31))
[  444.799563][ T4307]  udp_tunnel_nic_netdevice_event (net/ipv4/udp_tunnel_nic.c:943)
[  444.799903][ T4307]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4746)
[  444.800214][ T4307]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  444.800512][ T4307]  notifier_call_chain (kernel/notifier.c:87)
[  444.800863][ T4307]  unregister_netdevice_many_notify (net/core/dev.c:12471)
[  444.801217][ T4307]  ? __mutex_lock (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.c:88 kernel/locking/mutex.c:133 kernel/locking/mutex.c:617 kernel/locking/mutex.c:776)
[  444.801533][ T4307]  ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:755 kernel/locking/mutex.c:776)
[  444.801870][ T4307]  ? unregister_netdevice_queued (net/core/dev.c:12395)
[  444.802226][ T4307]  ? nsim_destroy (drivers/net/netdevsim/netdev.c:1186 (discriminator 1)) netdevsim
[  444.802546][ T4307]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  444.802873][ T4307]  unregister_netdevice_queue (net/core/dev.c:12344)
[  444.803171][ T4307]  ? unregister_netdevice_many (net/core/dev.c:12333)
[  444.803445][ T4307] nsim_destroy (drivers/net/netdevsim/netdev.c:1191) netdevsim
[  444.803757][ T4307]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  444.804055][ T4307] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:444 drivers/net/netdevsim/dev.c:1548) netdevsim
[  444.804426][ T4307] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1559 (discriminator 4) drivers/net/netdevsim/dev.c:1785 (discriminator 4)) netdevsim
[  444.804797][ T4307] nsim_drv_remove (drivers/net/netdevsim/dev.c:1802) netdevsim
[  444.805120][ T4307]  device_release_driver_internal (drivers/base/dd.c:1346 drivers/base/dd.c:1367)
[  444.805471][ T4307]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:664)
[  444.805808][ T4307]  ? bus_probe_device (drivers/base/bus.c:634)
[  444.806046][ T4307]  ? device_remove_file (drivers/base/core.c:2962)
[  444.806243][ T4307]  device_del (drivers/base/core.c:3881)
[  444.806406][ T4307]  ? __device_link_del (drivers/base/core.c:3835)
[  444.806617][ T4307]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[  444.806820][ T4307]  device_unregister (drivers/base/core.c:3798 drivers/base/core.c:3922)
[  444.807016][ T4307] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[  444.807253][ T4307]  ? sysfs_file_kobj (./include/linux/rcupdate.h:322 (discriminator 2) ./include/linux/rcupdate.h:881 (discriminator 2) ./include/linux/rcupdate.h:1193 (discriminator 2) fs/sysfs/file.c:24 (discriminator 2))
[  444.807448][ T4307]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[  444.807692][ T4307]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[  444.807896][ T4307]  ? sysfs_kf_write (fs/sysfs/file.c:139)
[  444.808093][ T4307]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[  444.808288][ T4307]  ? kernfs_ops (fs/kernfs/file.c:312)
[  444.808446][ T4307]  new_sync_write (fs/read_write.c:596 (discriminator 1))
[  444.808656][ T4307]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  444.808861][ T4307]  ? new_sync_read (fs/read_write.c:586)
[  444.809062][ T4307]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  444.809255][ T4307]  ? ksys_write (fs/read_write.c:741)
[  444.809453][ T4307]  vfs_write (fs/read_write.c:688)
[  444.809624][ T4307]  ksys_write (fs/read_write.c:741)
[  444.809784][ T4307]  ? __ia32_sys_read (fs/read_write.c:730)
[  444.809989][ T4307]  ? kernfs_fop_llseek (fs/kernfs/file.c:910)
[  444.810187][ T4307]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  444.810381][ T4307]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[  444.810574][ T4307]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[  444.810782][ T4307]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  444.811022][ T4307] RIP: 0033:0x7ff7dc93122e
[  444.811226][ T4307] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 94 bd 00 00       	call   0xbd9c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[  444.811811][ T4307] RSP: 002b:00007ffcc5840ab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  444.812085][ T4307] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ff7dc93122e
[  444.812352][ T4307] RDX: 0000000000000002 RSI: 000055e581010fa0 RDI: 0000000000000009
[  444.812632][ T4307] RBP: 00007ffcc5840ac0 R08: 0000000000000000 R09: 0000000000000000
[  444.812908][ T4307] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ff7dc7a9390
[  444.813182][ T4307] R13: 000055e581010fa0 R14: 0000000000000009 R15: 0000000000000003
| [  444.827978][ T4307] ------------[ cut here ]------------
| [  444.828224][ T4307] WARNING: lib/ref_tracker.c:248 at ref_tracker_dir_exit+0x54f/0x7e0, CPU#2: python3/4307
| [  444.828561][ T4307] Modules linked in: netdevsim
| [  444.829140][ T4307] Tainted: [W]=WARN
[  444.829293][ T4307] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  444.829513][ T4307] RIP: 0010:ref_tracker_dir_exit (lib/ref_tracker.c:248 (discriminator 4))
[  444.829867][ T4307] Code: 00 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 8b 74 24 10 48 89 ef e8 50 03 48 01 e9 24 ff ff ff 90 0f 0b 90 e9 60 ff ff ff 90 <0f> 0b 90 eb 97 e8 07 61 84 ff e9 43 fb ff ff 48 89 df e8 9a 60 84
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 5b 5d             	add    %bl,0x5d(%rbx)
   5:	41 5c                	pop    %r12
   7:	41 5d                	pop    %r13
   9:	41 5e                	pop    %r14
   b:	41 5f                	pop    %r15
   d:	c3                   	ret
   e:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
  13:	48 89 ef             	mov    %rbp,%rdi
  16:	e8 50 03 48 01       	call   0x148036b
  1b:	e9 24 ff ff ff       	jmp    0xffffffffffffff44
  20:	90                   	nop
  21:	0f 0b                	ud2
  23:	90                   	nop
  24:	e9 60 ff ff ff       	jmp    0xffffffffffffff89
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	eb 97                	jmp    0xffffffffffffffc6
  2f:	e8 07 61 84 ff       	call   0xffffffffff84613b
  34:	e9 43 fb ff ff       	jmp    0xfffffffffffffb7c
  39:	48 89 df             	mov    %rbx,%rdi
  3c:	e8                   	.byte 0xe8
  3d:	9a                   	(bad)
  3e:	60                   	(bad)
  3f:	84                   	.byte 0x84

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	eb 97                	jmp    0xffffffffffffff9c
   5:	e8 07 61 84 ff       	call   0xffffffffff846111
   a:	e9 43 fb ff ff       	jmp    0xfffffffffffffb52
   f:	48 89 df             	mov    %rbx,%rdi
  12:	e8                   	.byte 0xe8
  13:	9a                   	(bad)
  14:	60                   	(bad)
  15:	84                   	.byte 0x84
[  444.830395][ T4307] RSP: 0018:ffa0000007e07860 EFLAGS: 00010296
[  444.830628][ T4307] RAX: 0000000000000003 RBX: ff1100001c552608 RCX: 0000000000000001
[  444.830891][ T4307] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ff1100001c552608
[  444.831139][ T4307] RBP: ff1100001c5525c0 R08: ffffffffa74e455f R09: 1fe22000038aa4c1
[  444.831386][ T4307] R10: ffe21c00038aa4c2 R11: ffe21c00038aa4c2 R12: ff1100001c552610
[  444.831646][ T4307] R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
[  444.831903][ T4307] FS:  00007ff7dc7a9400(0000) GS:ff1100008a463000(0000) knlGS:0000000000000000
[  444.832186][ T4307] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  444.832404][ T4307] CR2: 00007ff7dbef1160 CR3: 000000001d6d0003 CR4: 0000000000771ef0
[  444.832668][ T4307] PKRU: 55555554
[  444.832822][ T4307] Call Trace:
[  444.832970][ T4307]  <TASK>
[  444.833091][ T4307]  ? ref_tracker_free (lib/ref_tracker.c:220)
[  444.833275][ T4307]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473)
[  444.833455][ T4307]  ? kasan_quarantine_put (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 mm/kasan/quarantine.c:234)
[  444.833654][ T4307]  ? kfree (mm/slub.c:6165 (discriminator 3) mm/slub.c:6483 (discriminator 3))
[  444.833812][ T4307]  free_netdev (net/core/dev.c:12248)
[  444.833997][ T4307] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:444 drivers/net/netdevsim/dev.c:1548) netdevsim
[  444.834215][ T4307] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1559 (discriminator 4) drivers/net/netdevsim/dev.c:1785 (discriminator 4)) netdevsim
[  444.834436][ T4307] nsim_drv_remove (drivers/net/netdevsim/dev.c:1802) netdevsim
[  444.834633][ T4307]  device_release_driver_internal (drivers/base/dd.c:1346 drivers/base/dd.c:1367)
[  444.834857][ T4307]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:664)
[  444.835038][ T4307]  ? bus_probe_device (drivers/base/bus.c:634)
[  444.835216][ T4307]  ? device_remove_file (drivers/base/core.c:2962)
[  444.835397][ T4307]  device_del (drivers/base/core.c:3881)
[  444.835546][ T4307]  ? __device_link_del (drivers/base/core.c:3835)
[  444.835743][ T4307]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[  444.835931][ T4307]  device_unregister (drivers/base/core.c:3798 drivers/base/core.c:3922)
[  444.836111][ T4307] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[  444.836328][ T4307]  ? sysfs_file_kobj (./include/linux/rcupdate.h:322 (discriminator 2) ./include/linux/rcupdate.h:881 (discriminator 2) ./include/linux/rcupdate.h:1193 (discriminator 2) fs/sysfs/file.c:24 (discriminator 2))
[  444.836509][ T4307]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[  444.836738][ T4307]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[  444.836927][ T4307]  ? sysfs_kf_write (fs/sysfs/file.c:139)
[  444.837108][ T4307]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[  444.837292][ T4307]  ? kernfs_ops (fs/kernfs/file.c:312)
[  444.837440][ T4307]  new_sync_write (fs/read_write.c:596 (discriminator 1))
[  444.837636][ T4307]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  444.837822][ T4307]  ? new_sync_read (fs/read_write.c:586)
[  444.838004][ T4307]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  444.838184][ T4307]  ? ksys_write (fs/read_write.c:741)
[  444.838369][ T4307]  vfs_write (fs/read_write.c:688)
[  444.838522][ T4307]  ksys_write (fs/read_write.c:741)
[  444.838683][ T4307]  ? __ia32_sys_read (fs/read_write.c:730)
[  444.838869][ T4307]  ? kernfs_fop_llseek (fs/kernfs/file.c:910)
[  444.839049][ T4307]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  444.839231][ T4307]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[  444.839410][ T4307]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[  444.839592][ T4307]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  444.839821][ T4307] RIP: 0033:0x7ff7dc93122e
[  444.840014][ T4307] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 94 bd 00 00       	call   0xbd9c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[  444.840539][ T4307] RSP: 002b:00007ffcc5840ab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  444.840808][ T4307] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ff7dc93122e
[  444.841063][ T4307] RDX: 0000000000000002 RSI: 000055e581010fa0 RDI: 0000000000000009
[  444.841311][ T4307] RBP: 00007ffcc5840ac0 R08: 0000000000000000 R09: 0000000000000000
[  444.841558][ T4307] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ff7dc7a9390
[  444.841825][ T4307] R13: 000055e581010fa0 R14: 0000000000000009 R15: 0000000000000003
| [  451.613896][ T4307] refcount_t: saturated; leaking memory.
| [  451.614023][ T4307] WARNING: lib/refcount.c:22 at refcount_warn_saturate+0x6c/0xc0, CPU#1: python3/4307
| [  451.614250][ T4307] Modules linked in: netdevsim
| [  451.614798][ T4307] Tainted: [W]=WARN
[  451.614932][ T4307] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  451.615130][ T4307] RIP: 0010:refcount_warn_saturate (lib/refcount.c:22 (discriminator 6))
[  451.615297][ T4307] Code: fd 02 74 5b 76 19 83 fd 03 74 45 83 fd 04 75 22 48 8d 3d 57 11 2f 03 67 48 0f b9 3a 5b 5d c3 85 ed 74 1e 48 8d 3d 54 11 2f 03 <67> 48 0f b9 3a 5b 5d c3 48 8d 3d 55 11 2f 03 67 48 0f b9 3a 5b 5d
All code
========
   0:	fd                   	std
   1:	02 74 5b 76          	add    0x76(%rbx,%rbx,2),%dh
   5:	19 83 fd 03 74 45    	sbb    %eax,0x457403fd(%rbx)
   b:	83 fd 04             	cmp    $0x4,%ebp
   e:	75 22                	jne    0x32
  10:	48 8d 3d 57 11 2f 03 	lea    0x32f1157(%rip),%rdi        # 0x32f116e
  17:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  1c:	5b                   	pop    %rbx
  1d:	5d                   	pop    %rbp
  1e:	c3                   	ret
  1f:	85 ed                	test   %ebp,%ebp
  21:	74 1e                	je     0x41
  23:	48 8d 3d 54 11 2f 03 	lea    0x32f1154(%rip),%rdi        # 0x32f117e
  2a:*	67 48 0f b9 3a       	ud1    (%edx),%rdi		<-- trapping instruction
  2f:	5b                   	pop    %rbx
  30:	5d                   	pop    %rbp
  31:	c3                   	ret
  32:	48 8d 3d 55 11 2f 03 	lea    0x32f1155(%rip),%rdi        # 0x32f118e
  39:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  3e:	5b                   	pop    %rbx
  3f:	5d                   	pop    %rbp

Code starting with the faulting instruction
===========================================
   0:	67 48 0f b9 3a       	ud1    (%edx),%rdi
   5:	5b                   	pop    %rbx
   6:	5d                   	pop    %rbp
   7:	c3                   	ret
   8:	48 8d 3d 55 11 2f 03 	lea    0x32f1155(%rip),%rdi        # 0x32f1164
   f:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  14:	5b                   	pop    %rbx
  15:	5d                   	pop    %rbp
[  451.615747][ T4307] RSP: 0018:ffa0000007e07610 EFLAGS: 00010202
[  451.615911][ T4307] RAX: 0000000000000003 RBX: ff11000024d9a608 RCX: 0000000000000001
[  451.616098][ T4307] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffaa6b8f10
[  451.616284][ T4307] RBP: 0000000000000001 R08: ffffffffa73c7d65 R09: 1fe22000049b34c1
[  451.616471][ T4307] R10: ffe21c00049b34c2 R11: ffe21c00049b34c2 R12: 1ff4000000fc0ec6
[  451.616664][ T4307] R13: 0000000000000820 R14: 0000000000000000 R15: 0000000000000000
[  451.616857][ T4307] FS:  00007ff7dc7a9400(0000) GS:ff1100008a3e3000(0000) knlGS:0000000000000000
[  451.617078][ T4307] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  451.617235][ T4307] CR2: 00007ff7dbe56140 CR3: 000000001d6d0002 CR4: 0000000000771ef0
[  451.617423][ T4307] PKRU: 55555554
[  451.617518][ T4307] Call Trace:
[  451.617616][ T4307]  <TASK>
[  451.617681][ T4307]  ref_tracker_alloc (./include/linux/refcount.h:291 ./include/linux/refcount.h:366 ./include/linux/refcount.h:383 lib/ref_tracker.c:265)
[  451.617808][ T4307]  ? ref_tracker_dir_print (lib/ref_tracker.c:255)
[  451.617944][ T4307]  dev_get_by_index (./include/linux/rcupdate.h:879 net/core/dev.c:1003)
[  451.618072][ T4307]  netdev_get_by_index_lock_ops_compat (net/core/dev.c:1118)
[  451.618227][ T4307]  netdev_nl_queue_get_doit (net/core/netdev-genl.c:571 (discriminator 1))
[  451.618354][ T4307]  genl_family_rcv_msg_doit (net/netlink/genetlink.c:1116)
[  451.618480][ T4307]  ? genl_family_rcv_msg_attrs_parse.isra.0 (net/netlink/genetlink.c:1087)
[  451.618641][ T4307]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  451.618766][ T4307]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  451.618898][ T4307]  ? is_bpf_text_address (kernel/bpf/core.c:753)
[  451.619024][ T4307]  genl_family_rcv_msg (net/netlink/genetlink.c:1194 (discriminator 1))
[  451.619151][ T4307]  ? genl_family_rcv_msg_dumpit (net/netlink/genetlink.c:1159)
[  451.619306][ T4307]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 4) kernel/rcu/tree.c:4032 (discriminator 4))
[  451.619462][ T4307]  ? netdev_nl_napi_set_doit (net/core/netdev-genl.c:552)
[  451.619586][ T4307]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 3) kernel/locking/lockdep.c:3821 (discriminator 3) kernel/locking/lockdep.c:3876 (discriminator 3))
[  451.619715][ T4307]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  451.619843][ T4307]  ? rcu_report_exp_cpu_mult (kernel/rcu/tree_exp.h:254 (discriminator 5))
[  451.619970][ T4307]  genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1210)
[  451.620097][ T4307]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  451.620221][ T4307]  ? genl_family_rcv_msg (net/netlink/genetlink.c:1200)
[  451.620347][ T4307]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  451.620476][ T4307]  ? netlink_deliver_tap (./include/linux/rcupdate.h:322 (discriminator 2) ./include/linux/rcupdate.h:881 (discriminator 2) ./include/net/netns/generic.h:48 (discriminator 2) net/netlink/af_netlink.c:333 (discriminator 2))
[  451.620601][ T4307]  ? netlink_deliver_tap (./include/linux/rcupdate.h:322 (discriminator 2) ./include/linux/rcupdate.h:881 (discriminator 2) net/netlink/af_netlink.c:340 (discriminator 2))
[  451.620731][ T4307]  genl_rcv (net/netlink/genetlink.c:1219)
[  451.620825][ T4307]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  451.620955][ T4307]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  451.621078][ T4307]  ? __alloc_skb (./include/linux/bottom_half.h:20 (discriminator 2) net/core/skbuff.c:695 (discriminator 2))
[  451.621204][ T4307]  ? napi_skb_cache_get (net/core/skbuff.c:674)
[  451.621328][ T4307]  ? netlink_autobind.isra.0 (./include/linux/rcupdate.h:322 (discriminator 2) ./include/linux/rcupdate.h:881 (discriminator 2) net/netlink/af_netlink.c:814 (discriminator 2))
[  451.621453][ T4307]  ? netlink_autobind.isra.0 (net/netlink/af_netlink.c:827)
[  451.621580][ T4307]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  451.621711][ T4307]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  451.621840][ T4307]  ? _copy_from_user (./arch/x86/include/asm/smap.h:47 ./arch/x86/include/asm/uaccess_64.h:121 ./arch/x86/include/asm/uaccess_64.h:141 ./include/linux/uaccess.h:185 lib/usercopy.c:18)
[  451.621966][ T4307]  ? netlink_setsockopt (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 net/netlink/af_netlink.c:1714)
[  451.622090][ T4307]  __sys_sendto (net/socket.c:722 (discriminator 4) net/socket.c:737 (discriminator 4) net/socket.c:2200 (discriminator 4))
[  451.622215][ T4307]  ? __ia32_sys_getpeername (net/socket.c:2167)
[  451.622341][ T4307]  ? kfree (mm/slub.c:6471 (discriminator 1))
[  451.622439][ T4307]  ? put_user_ifreq (net/socket.c:2285)
[  451.622568][ T4307]  ? __sys_setsockopt (net/socket.c:2341 (discriminator 1))
[  451.622701][ T4307]  __x64_sys_sendto (net/socket.c:2207 (discriminator 1) net/socket.c:2203 (discriminator 1) net/socket.c:2203 (discriminator 1))
[  451.622826][ T4307]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 24))
[  451.622989][ T4307]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473)
[  451.623115][ T4307]  ? do_syscall_64 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 ./include/linux/entry-common.h:186 arch/x86/entry/syscall_64.c:90)
[  451.623238][ T4307]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[  451.623361][ T4307]  ? common_interrupt (arch/x86/kernel/irq.c:326 (discriminator 47))
[  451.623485][ T4307]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  451.623646][ T4307] RIP: 0033:0x7ff7dc93122e
[  451.623779][ T4307] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 94 bd 00 00       	call   0xbd9c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[  451.624225][ T4307] RSP: 002b:00007ffcc5840800 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  451.624414][ T4307] RAX: ffffffffffffffda RBX: 00007ffcc5840910 RCX: 00007ff7dc93122e
[  451.624607][ T4307] RDX: 000000000000002c RSI: 00007ff7dbb540a0 RDI: 000000000000000f
[  451.624795][ T4307] RBP: 00007ffcc5840810 R08: 0000000000000000 R09: 0000000000000000
[  451.624985][ T4307] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ff7dbbc01a0


Finger prints:
ref_tracker_dir_exit:free_netdev:__nsim_dev_port_del:nsim_dev_reload_destroy:nsim_drv_remove
refcount_warn_saturate:ref_tracker_free:udp_tunnel_nic_unregister:udp_tunnel_nic_netdevice_event:notifier_call_chain
refcount_warn_saturate:ref_tracker_alloc:dev_get_by_index:netdev_get_by_index_lock_ops_compat:netdev_nl_queue_get_doit