======================================
| [   20.518621][   T70] bond0: (slave eth1): Releasing backup interface
| [   20.553708][   T70] ------------[ cut here ]------------
| [   20.554176][   T70] kernel BUG at net/core/net-sysfs.c:2246!
| [   20.554662][   T70] Oops: invalid opcode: 0000 [#1] SMP KASAN
[   20.555286][   T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.555545][   T70] Workqueue: netns cleanup_net
[   20.555773][   T70] RIP: 0010:netdev_release (net/core/net-sysfs.c:2246 net/core/net-sysfs.c:2242)
[   20.555975][   T70] 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
[   20.556715][   T70] RSP: 0018:ffffc900004b7728 EFLAGS: 00010297
[   20.557064][   T70] RAX: 0000000000000000 RBX: ffff88800e86a660 RCX: ffffffff9b64cb51
[   20.557474][   T70] RDX: 1ffff11001d0d4c8 RSI: ffffffff9ba5f0c0 RDI: ffff88800e86a640
[   20.557928][   T70] RBP: ffff88800e86a000 R08: 0000000000000001 R09: ffffed1001d0d4d3
[   20.558376][   T70] R10: ffff88800e86a69b R11: ffffc900004b7448 R12: ffff8880053fa000
[   20.558824][   T70] R13: 0000000000000000 R14: dead000000000122 R15: dead000000000100
[   20.559283][   T70] FS:  0000000000000000(0000) GS:ffff888098a81000(0000) knlGS:0000000000000000
[   20.559809][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.560204][   T70] CR2: 0000563eca99e028 CR3: 0000000032b35004 CR4: 0000000000772ef0
[   20.560663][   T70] PKRU: 55555554
[   20.560896][   T70] Call Trace:
[   20.561134][   T70]  <TASK>
[   20.561298][   T70]  device_release (drivers/base/core.c:2570)
[   20.561639][   T70]  kobject_cleanup (lib/kobject.c:693)
[   20.561967][   T70]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   20.562277][   T70]  ? kasan_quarantine_put (mm/kasan/quarantine.c:234 (discriminator 1))
[   20.562602][   T70]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   20.562924][   T70]  ? generic_xdp_install (net/core/dev.c:11630)
[   20.563226][   T70]  ? kfree (mm/slub.c:6630 mm/slub.c:6837)
[   20.563467][   T70] nsim_destroy (drivers/net/netdevsim/netdev.c:1186) netdevsim
[   20.563791][   T70] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:441 drivers/net/netdevsim/dev.c:1474) netdevsim
[   20.564171][   T70] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1483 drivers/net/netdevsim/dev.c:1707) netdevsim
[   20.564550][   T70] nsim_dev_reload_down (drivers/net/netdevsim/dev.c:984) netdevsim
[   20.564933][   T70]  devlink_reload (net/devlink/dev.c:462)
[   20.565240][   T70]  ? devlink_notify_unregister (net/devlink/dev.c:446)
[   20.565543][   T70]  devlink_pernet_pre_exit (net/devlink/core.c:288 net/devlink/devl_internal.h:114 net/devlink/core.c:513)
[   20.565861][   T70]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724)
[   20.566189][   T70]  ? devlinks_xa_find_get (net/devlink/core.c:496)
[   20.566483][   T70]  ? __up_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1388)
[   20.566784][   T70]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724)
[   20.567088][   T70]  ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724)
[   20.567381][   T70]  ops_undo_list (net/core/net_namespace.c:160 net/core/net_namespace.c:234)
[   20.567674][   T70]  ? netns_get (net/core/net_namespace.c:223)
[   20.567964][   T70]  ? cleanup_net (./include/linux/list.h:191 net/core/net_namespace.c:693)
[   20.568259][   T70]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.568562][   T70]  cleanup_net (net/core/net_namespace.c:698)
[   20.568866][   T70]  ? net_passive_dec (net/core/net_namespace.c:660)
[   20.569180][   T70]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   20.569486][   T70]  process_one_work (kernel/workqueue.c:3268)
[   20.569801][   T70]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:3165)
[   20.570108][   T70]  ? assign_work (kernel/workqueue.c:1206)
[   20.570397][   T70]  worker_thread (kernel/workqueue.c:3340 kernel/workqueue.c:3427)
[   20.570693][   T70]  ? rescuer_thread (kernel/workqueue.c:3373)
[   20.570993][   T70]  kthread (kernel/kthread.c:463)
[   20.571221][   T70]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   20.571525][   T70]  ? ret_from_fork (arch/x86/kernel/process.c:157)
[   20.571840][   T70]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   20.572131][   T70]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   20.572421][   T70]  ? kthread_is_per_cpu (kernel/kthread.c:412)
[   20.572725][   T70]  ret_from_fork (arch/x86/kernel/process.c:164)
[   20.573021][   T70]  ? kthread_is_per_cpu (kernel/kthread.c:412)


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