======================================
| [  654.115494][ T6890] ------------[ cut here ]------------
| [  654.115778][ T6890] refcount_t: decrement hit 0; leaking memory.
| [  654.116040][ T6890] WARNING: lib/refcount.c:31 at refcount_warn_saturate+0x59/0xc0, CPU#3: python3/6890
| [  654.116334][ T6890] Modules linked in: netdevsim 8021q macsec netconsole
[  654.116938][ T6890] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  654.117137][ T6890] RIP: 0010:refcount_warn_saturate (lib/refcount.c:31 (discriminator 6))
[  654.117339][ T6890] 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
[  654.117956][ T6890] RSP: 0018:ffa0000000687508 EFLAGS: 00010246
[  654.118158][ T6890] RAX: 0000000000000003 RBX: ff1100001203a608 RCX: 0000000000000001
[  654.118388][ T6890] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffbc0b8f00
[  654.118621][ T6890] RBP: 0000000000000004 R08: ffffffffb8dc7d65 R09: 1fe22000024074c1
[  654.118958][ T6890] R10: ffe21c00024074c2 R11: ffe21c00024074c2 R12: 1ff40000000d0ea8
[  654.119186][ T6890] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000002
[  654.119418][ T6890] FS:  00007fa07df3a400(0000) GS:ff11000078ae3000(0000) knlGS:0000000000000000
[  654.119690][ T6890] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  654.119935][ T6890] CR2: 00007fa07d31d030 CR3: 0000000018f45003 CR4: 0000000000771ef0
[  654.120164][ T6890] PKRU: 55555554
[  654.120283][ T6890] Call Trace:
[  654.120400][ T6890]  <TASK>
[  654.120480][ T6890]  ref_tracker_free (./include/linux/refcount.h:461 ./include/linux/refcount.h:476 lib/ref_tracker.c:298)
[  654.120640][ T6890]  ? ref_tracker_alloc (lib/ref_tracker.c:288)
[  654.120800][ T6890]  ? kfree (mm/slub.c:6165 (discriminator 3) mm/slub.c:6483 (discriminator 3))
[  654.120919][ T6890]  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))
[  654.121075][ T6890]  udp_tunnel_nic_netdevice_event (net/ipv4/udp_tunnel_nic.c:943)
[  654.121264][ T6890]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4746)
[  654.121419][ T6890]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  654.121575][ T6890]  notifier_call_chain (kernel/notifier.c:87)
[  654.121730][ T6890]  unregister_netdevice_many_notify (net/core/dev.c:12471)
[  654.121927][ T6890]  ? __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)
[  654.122079][ T6890]  ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:755 kernel/locking/mutex.c:776)
[  654.122231][ T6890]  ? unregister_netdevice_queued (net/core/dev.c:12395)
[  654.122425][ T6890]  ? nsim_destroy (drivers/net/netdevsim/netdev.c:1186 (discriminator 1)) netdevsim
[  654.122589][ T6890]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  654.122744][ T6890]  unregister_netdevice_queue (net/core/dev.c:12344)
[  654.122905][ T6890]  ? unregister_netdevice_many (net/core/dev.c:12333)
[  654.123061][ T6890] nsim_destroy (drivers/net/netdevsim/netdev.c:1191) netdevsim
[  654.123215][ T6890]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  654.123368][ T6890] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:444 drivers/net/netdevsim/dev.c:1548) netdevsim
[  654.123565][ T6890] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1559 (discriminator 4) drivers/net/netdevsim/dev.c:1785 (discriminator 4)) netdevsim
[  654.123755][ T6890] nsim_drv_remove (drivers/net/netdevsim/dev.c:1802) netdevsim
[  654.123915][ T6890]  device_release_driver_internal (drivers/base/dd.c:1346 drivers/base/dd.c:1367)
[  654.124109][ T6890]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:664)
[  654.124264][ T6890]  ? bus_probe_device (drivers/base/bus.c:634)
[  654.124415][ T6890]  ? device_remove_file (drivers/base/core.c:2962)
[  654.124573][ T6890]  device_del (drivers/base/core.c:3881)
[  654.124689][ T6890]  ? __device_link_del (drivers/base/core.c:3835)
[  654.124848][ T6890]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[  654.125002][ T6890]  device_unregister (drivers/base/core.c:3798 drivers/base/core.c:3922)
[  654.125153][ T6890] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[  654.125344][ T6890]  ? 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))
[  654.125499][ T6890]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[  654.125692][ T6890]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[  654.125847][ T6890]  ? sysfs_kf_write (fs/sysfs/file.c:139)
[  654.125999][ T6890]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[  654.126150][ T6890]  ? kernfs_ops (fs/kernfs/file.c:312)
[  654.126265][ T6890]  new_sync_write (fs/read_write.c:596 (discriminator 1))
[  654.126420][ T6890]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  654.126574][ T6890]  ? new_sync_read (fs/read_write.c:586)
[  654.126725][ T6890]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  654.126880][ T6890]  ? ksys_write (fs/read_write.c:741)
[  654.127035][ T6890]  vfs_write (fs/read_write.c:688)
[  654.127151][ T6890]  ksys_write (fs/read_write.c:741)
[  654.127267][ T6890]  ? __ia32_sys_read (fs/read_write.c:730)
[  654.127419][ T6890]  ? kernfs_fop_llseek (fs/kernfs/file.c:910)
[  654.127571][ T6890]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  654.127725][ T6890]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[  654.127883][ T6890]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[  654.128035][ T6890]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  654.128224][ T6890] RIP: 0033:0x7fa07e0c222e
[  654.128383][ T6890] 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
[  654.128930][ T6890] RSP: 002b:00007ffc325f0b20 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  654.129159][ T6890] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fa07e0c222e
[  654.129388][ T6890] RDX: 0000000000000004 RSI: 000055d5de858fa0 RDI: 0000000000000009
[  654.129615][ T6890] RBP: 00007ffc325f0b30 R08: 0000000000000000 R09: 0000000000000000
[  654.129847][ T6890] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fa07df3a390
[  654.130074][ T6890] R13: 000055d5de858fa0 R14: 0000000000000009 R15: 0000000000000003
| [  654.145107][ T6890] ------------[ cut here ]------------
| [  654.145332][ T6890] WARNING: lib/ref_tracker.c:248 at ref_tracker_dir_exit+0x54f/0x7e0, CPU#1: python3/6890
| [  654.145636][ T6890] Modules linked in: netdevsim 8021q macsec netconsole
| [  654.146143][ T6890] Tainted: [W]=WARN
[  654.146250][ T6890] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  654.146430][ T6890] RIP: 0010:ref_tracker_dir_exit (lib/ref_tracker.c:248 (discriminator 4))
[  654.146613][ T6890] 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
[  654.147189][ T6890] RSP: 0018:ffa0000000687860 EFLAGS: 00010296
[  654.147365][ T6890] RAX: 0000000000000003 RBX: ff1100001203a608 RCX: 0000000000000001
[  654.147575][ T6890] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ff1100001203a608
[  654.147880][ T6890] RBP: ff1100001203a5c0 R08: ffffffffb8ee455f R09: 1fe22000024074c1
[  654.148088][ T6890] R10: ffe21c00024074c2 R11: ffe21c00024074c2 R12: ff1100001203a610
[  654.148294][ T6890] R13: dead000000000122 R14: dead000000000100 R15: dffffc0000000000
[  654.148505][ T6890] FS:  00007fa07df3a400(0000) GS:ff110000789e3000(0000) knlGS:0000000000000000
[  654.148748][ T6890] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  654.149028][ T6890] CR2: 0000558e8f5966c0 CR3: 0000000018f45006 CR4: 0000000000771ef0
[  654.149237][ T6890] PKRU: 55555554
[  654.149342][ T6890] Call Trace:
[  654.149446][ T6890]  <TASK>
[  654.149524][ T6890]  ? ref_tracker_free (lib/ref_tracker.c:220)
[  654.149664][ T6890]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473)
[  654.149874][ T6890]  ? 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)
[  654.150012][ T6890]  ? kfree (mm/slub.c:6165 (discriminator 3) mm/slub.c:6483 (discriminator 3))
[  654.150118][ T6890]  free_netdev (net/core/dev.c:12248)
[  654.150258][ T6890] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:444 drivers/net/netdevsim/dev.c:1548) netdevsim
[  654.150433][ T6890] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1559 (discriminator 4) drivers/net/netdevsim/dev.c:1785 (discriminator 4)) netdevsim
[  654.150610][ T6890] nsim_drv_remove (drivers/net/netdevsim/dev.c:1802) netdevsim
[  654.150749][ T6890]  device_release_driver_internal (drivers/base/dd.c:1346 drivers/base/dd.c:1367)
[  654.151021][ T6890]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:664)
[  654.151159][ T6890]  ? bus_probe_device (drivers/base/bus.c:634)
[  654.151297][ T6890]  ? device_remove_file (drivers/base/core.c:2962)
[  654.151437][ T6890]  device_del (drivers/base/core.c:3881)
[  654.151546][ T6890]  ? __device_link_del (drivers/base/core.c:3835)
[  654.151689][ T6890]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[  654.151924][ T6890]  device_unregister (drivers/base/core.c:3798 drivers/base/core.c:3922)
[  654.152061][ T6890] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[  654.152233][ T6890]  ? 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))
[  654.152369][ T6890]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[  654.152546][ T6890]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[  654.152684][ T6890]  ? sysfs_kf_write (fs/sysfs/file.c:139)
[  654.152901][ T6890]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[  654.153041][ T6890]  ? kernfs_ops (fs/kernfs/file.c:312)
[  654.153145][ T6890]  new_sync_write (fs/read_write.c:596 (discriminator 1))
[  654.153284][ T6890]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  654.153423][ T6890]  ? new_sync_read (fs/read_write.c:586)
[  654.153565][ T6890]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  654.153700][ T6890]  ? ksys_write (fs/read_write.c:741)
[  654.153953][ T6890]  vfs_write (fs/read_write.c:688)
[  654.154060][ T6890]  ksys_write (fs/read_write.c:741)
[  654.154165][ T6890]  ? __ia32_sys_read (fs/read_write.c:730)
[  654.154302][ T6890]  ? kernfs_fop_llseek (fs/kernfs/file.c:910)
[  654.154439][ T6890]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  654.154582][ T6890]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[  654.154720][ T6890]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[  654.154934][ T6890]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  654.155104][ T6890] RIP: 0033:0x7fa07e0c222e
[  654.155251][ T6890] 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
[  654.155745][ T6890] RSP: 002b:00007ffc325f0b20 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  654.156054][ T6890] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fa07e0c222e
[  654.156262][ T6890] RDX: 0000000000000004 RSI: 000055d5de858fa0 RDI: 0000000000000009
[  654.156469][ T6890] RBP: 00007ffc325f0b30 R08: 0000000000000000 R09: 0000000000000000
[  654.156680][ T6890] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fa07df3a390
[  654.156977][ T6890] R13: 000055d5de858fa0 R14: 0000000000000009 R15: 0000000000000003
| [  660.866178][ T6890] refcount_t: saturated; leaking memory.
| [  660.866356][ T6890] WARNING: lib/refcount.c:22 at refcount_warn_saturate+0x6c/0xc0, CPU#2: python3/6890
| [  660.866634][ T6890] Modules linked in: netdevsim 8021q macsec netconsole
| [  660.867285][ T6890] Tainted: [W]=WARN
[  660.867444][ T6890] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  660.867657][ T6890] RIP: 0010:refcount_warn_saturate (lib/refcount.c:22 (discriminator 6))
[  660.867878][ T6890] 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
[  660.868375][ T6890] RSP: 0018:ffa0000000687610 EFLAGS: 00010202
[  660.868588][ T6890] RAX: 0000000000000003 RBX: ff1100000ecba608 RCX: 0000000000000001
[  660.868831][ T6890] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffbc0b8f10
[  660.869062][ T6890] RBP: 0000000000000001 R08: ffffffffb8dc7d65 R09: 1fe2200001d974c1
[  660.869295][ T6890] R10: ffe21c0001d974c2 R11: ffe21c0001d974c2 R12: 1ff40000000d0ec6
[  660.869528][ T6890] R13: 0000000000000820 R14: 0000000000000000 R15: 0000000000000000
[  660.869791][ T6890] FS:  00007fa07df3a400(0000) GS:ff11000078a63000(0000) knlGS:0000000000000000
[  660.870055][ T6890] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  660.870256][ T6890] CR2: 00007fa07d5e6140 CR3: 0000000018f45005 CR4: 0000000000771ef0
[  660.870492][ T6890] PKRU: 55555554
[  660.870638][ T6890] Call Trace:
[  660.870787][ T6890]  <TASK>
[  660.870899][ T6890]  ref_tracker_alloc (./include/linux/refcount.h:291 ./include/linux/refcount.h:366 ./include/linux/refcount.h:383 lib/ref_tracker.c:265)
[  660.871074][ T6890]  ? ref_tracker_dir_print (lib/ref_tracker.c:255)
[  660.871251][ T6890]  dev_get_by_index (./include/linux/rcupdate.h:879 net/core/dev.c:1003)
[  660.871424][ T6890]  netdev_get_by_index_lock_ops_compat (net/core/dev.c:1118)
[  660.871636][ T6890]  netdev_nl_queue_get_doit (net/core/netdev-genl.c:571 (discriminator 1))
[  660.871821][ T6890]  genl_family_rcv_msg_doit (net/netlink/genetlink.c:1116)
[  660.871993][ T6890]  ? genl_family_rcv_msg_attrs_parse.isra.0 (net/netlink/genetlink.c:1087)
[  660.872197][ T6890]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  660.872368][ T6890]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  660.872552][ T6890]  ? is_bpf_text_address (kernel/bpf/core.c:753)
[  660.872726][ T6890]  genl_family_rcv_msg (net/netlink/genetlink.c:1194 (discriminator 1))
[  660.872973][ T6890]  ? genl_family_rcv_msg_dumpit (net/netlink/genetlink.c:1159)
[  660.873174][ T6890]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4040 (discriminator 4) kernel/rcu/tree.c:4032 (discriminator 4))
[  660.873379][ T6890]  ? netdev_nl_napi_set_doit (net/core/netdev-genl.c:552)
[  660.873555][ T6890]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 3) kernel/locking/lockdep.c:3821 (discriminator 3) kernel/locking/lockdep.c:3876 (discriminator 3))
[  660.873726][ T6890]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  660.873907][ T6890]  ? rcu_report_exp_cpu_mult (kernel/rcu/tree_exp.h:254 (discriminator 5))
[  660.874079][ T6890]  genl_rcv_msg (net/netlink/genetlink.c:65 net/netlink/genetlink.c:1210)
[  660.874251][ T6890]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[  660.874420][ T6890]  ? genl_family_rcv_msg (net/netlink/genetlink.c:1200)
[  660.874597][ T6890]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[  660.874785][ T6890]  ? 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))
[  660.874957][ T6890]  ? 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))
[  660.875129][ T6890]  genl_rcv (net/netlink/genetlink.c:1219)
[  660.875270][ T6890]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[  660.875442][ T6890]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[  660.875618][ T6890]  ? __alloc_skb (./include/linux/bottom_half.h:20 (discriminator 2) net/core/skbuff.c:695 (discriminator 2))
[  660.875803][ T6890]  ? napi_skb_cache_get (net/core/skbuff.c:674)
[  660.875974][ T6890]  ? 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))
[  660.876144][ T6890]  ? netlink_autobind.isra.0 (net/netlink/af_netlink.c:827)
[  660.876317][ T6890]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[  660.876487][ T6890]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[  660.876666][ T6890]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  660.876849][ T6890]  ? update_se (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:1682 ./include/linux/sched/cputime.h:170 kernel/sched/fair.c:1253)
[  660.877025][ T6890]  __sys_sendto (net/socket.c:722 (discriminator 4) net/socket.c:737 (discriminator 4) net/socket.c:2200 (discriminator 4))
[  660.877196][ T6890]  ? __ia32_sys_getpeername (net/socket.c:2167)
[  660.877369][ T6890]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  660.877546][ T6890]  ? trace_sched_exit_tp (./include/trace/events/sched.h:886 (discriminator 24))
[  660.877721][ T6890]  ? preempt_schedule_notrace_thunk (arch/x86/entry/thunk.S:13)
[  660.877934][ T6890]  ? trace_irq_enable.constprop.0 (./arch/x86/include/asm/bitops.h:222 ./arch/x86/include/asm/bitops.h:233 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:649 ./include/linux/cpumask.h:1231 ./include/trace/events/preemptirq.h:40)
[  660.878137][ T6890]  __x64_sys_sendto (net/socket.c:2207 (discriminator 1) net/socket.c:2203 (discriminator 1) net/socket.c:2203 (discriminator 1))
[  660.878309][ T6890]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 24))
[  660.878508][ T6890]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473)
[  660.878683][ T6890]  ? 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)
[  660.878862][ T6890]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[  660.879033][ T6890]  ? irq_exit_rcu (kernel/softirq.c:741 (discriminator 32))
[  660.879205][ T6890]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  660.879404][ T6890] RIP: 0033:0x7fa07e0c222e
[  660.879584][ T6890] 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
[  660.880085][ T6890] RSP: 002b:00007ffc325f0870 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  660.880319][ T6890] RAX: ffffffffffffffda RBX: 00007ffc325f0980 RCX: 00007fa07e0c222e
[  660.880556][ T6890] RDX: 000000000000002c RSI: 00007fa07d298050 RDI: 000000000000000f
[  660.880800][ T6890] RBP: 00007ffc325f0880 R08: 0000000000000000 R09: 0000000000000000
[  660.881033][ T6890] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fa07d34c1a0


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