======================================
| [   29.584798][   T12] bond0: (slave eth1): Releasing backup interface
| [   29.619028][   T12] ------------[ cut here ]------------
| [   29.619833][   T12] kernel BUG at net/core/net-sysfs.c:2246!
| [   29.620558][   T12] Oops: invalid opcode: 0000 [#1] SMP KASAN
[   29.621425][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   29.621681][   T12] Workqueue: netns cleanup_net
[   29.621890][   T12] RIP: 0010:netdev_release (net/core/net-sysfs.c:2246 net/core/net-sysfs.c:2242)
[   29.622116][   T12] Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 20 48 8b bb d0 fa ff ff e8 9c be cd fe 48 89 ef 5b 5d e9 62 cb cd fe 90 <0f> 0b e8 0a a2 d4 fe eb bc e8 63 a2 d4 fe eb d9 90 f3 0f 1e fa 0f
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 fc                	add    %bh,%ah
   4:	ff                   	lcall  (bad)
   5:	df 48 89             	fisttps -0x77(%rax)
   8:	fa                   	cli
   9:	48 c1 ea 03          	shr    $0x3,%rdx
   d:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  11:	75 20                	jne    0x33
  13:	48 8b bb d0 fa ff ff 	mov    -0x530(%rbx),%rdi
  1a:	e8 9c be cd fe       	call   0xfffffffffecdbebb
  1f:	48 89 ef             	mov    %rbp,%rdi
  22:	5b                   	pop    %rbx
  23:	5d                   	pop    %rbp
  24:	e9 62 cb cd fe       	jmp    0xfffffffffecdcb8b
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	e8 0a a2 d4 fe       	call   0xfffffffffed4a23b
  31:	eb bc                	jmp    0xffffffffffffffef
  33:	e8 63 a2 d4 fe       	call   0xfffffffffed4a29b
  38:	eb d9                	jmp    0x13
  3a:	90                   	nop
  3b:	f3 0f 1e fa          	endbr64
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	e8 0a a2 d4 fe       	call   0xfffffffffed4a211
   7:	eb bc                	jmp    0xffffffffffffffc5
   9:	e8 63 a2 d4 fe       	call   0xfffffffffed4a271
   e:	eb d9                	jmp    0xffffffffffffffe9
  10:	90                   	nop
  11:	f3 0f 1e fa          	endbr64
  15:	0f                   	.byte 0xf
[   29.622926][   T12] RSP: 0018:ffffc900000c7728 EFLAGS: 00010297
[   29.623192][   T12] RAX: 0000000000000000 RBX: ffff888008c02660 RCX: ffffffff98c4cb51
[   29.623493][   T12] RDX: 1ffff110011804c8 RSI: ffffffff9905f0c0 RDI: ffff888008c02640
[   29.623874][   T12] RBP: ffff888008c02000 R08: 0000000000000001 R09: ffffed10011804d3
[   29.624285][   T12] R10: ffff888008c0269b R11: ffffc900000c7448 R12: ffff88800bd57400
[   29.624580][   T12] R13: 0000000000000000 R14: dead000000000122 R15: dead000000000100
[   29.624857][   T12] FS:  0000000000000000(0000) GS:ffff88809b401000(0000) knlGS:0000000000000000
[   29.625230][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.625482][   T12] CR2: 00007fb701ea7ff0 CR3: 0000000016b35003 CR4: 0000000000772ef0
[   29.625779][   T12] PKRU: 55555554
[   29.625953][   T12] Call Trace:
[   29.626096][   T12]  <TASK>
[   29.626194][   T12]  device_release (drivers/base/core.c:2570)
[   29.626391][   T12]  kobject_cleanup (lib/kobject.c:693)
[   29.626582][   T12]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   29.626772][   T12]  ? kasan_quarantine_put (mm/kasan/quarantine.c:234 (discriminator 1))
[   29.626979][   T12]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   29.627173][   T12]  ? generic_xdp_install (net/core/dev.c:11630)
[   29.627367][   T12]  ? kfree (mm/slub.c:6630 mm/slub.c:6837)
[   29.627514][   T12] nsim_destroy (drivers/net/netdevsim/netdev.c:1186) netdevsim
[   29.627717][   T12] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:441 drivers/net/netdevsim/dev.c:1474) netdevsim
[   29.627965][   T12] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1483 drivers/net/netdevsim/dev.c:1707) netdevsim
[   29.628199][   T12] nsim_dev_reload_down (drivers/net/netdevsim/dev.c:984) netdevsim
[   29.628450][   T12]  devlink_reload (net/devlink/dev.c:462)
[   29.628635][   T12]  ? devlink_notify_unregister (net/devlink/dev.c:446)
[   29.628820][   T12]  devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513)
[   29.629006][   T12]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724)
[   29.629193][   T12]  ? devlinks_xa_find_get (net/devlink/core.c:496)
[   29.629382][   T12]  ? __up_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1388)
[   29.629570][   T12]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724)
[   29.629750][   T12]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724)
[   29.629939][   T12]  ops_undo_list (net/core/net_namespace.c:160 net/core/net_namespace.c:234)
[   29.630123][   T12]  ? netns_get (net/core/net_namespace.c:223)
[   29.630322][   T12]  ? cleanup_net (./include/linux/list.h:191 net/core/net_namespace.c:693)
[   29.630505][   T12]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   29.630687][   T12]  cleanup_net (net/core/net_namespace.c:698)
[   29.630866][   T12]  ? net_passive_dec (net/core/net_namespace.c:660)
[   29.631066][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   29.631260][   T12]  process_one_work (kernel/workqueue.c:3268)
[   29.631446][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:3165)
[   29.631632][   T12]  ? assign_work (kernel/workqueue.c:1206)
[   29.631823][   T12]  worker_thread (kernel/workqueue.c:3340 kernel/workqueue.c:3427)
[   29.632024][   T12]  ? rescuer_thread (kernel/workqueue.c:3373)
[   29.632209][   T12]  kthread (kernel/kthread.c:463)
[   29.632348][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   29.632584][   T12]  ? ret_from_fork (arch/x86/kernel/process.c:157)
[   29.632790][   T12]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   29.632995][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   29.633199][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   29.633407][   T12]  ret_from_fork (arch/x86/kernel/process.c:164)
[   29.633588][   T12]  ? kthread_is_per_cpu (kernel/kthread.c:412)


Finger prints:
netdev_release:device_release:kobject_cleanup:netdev_run_todo:nsim_destroy