[    2.050809] ip (267) used greatest stack depth: 12072 bytes left
[    4.452447] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    4.452524] #PF: supervisor write access in kernel mode
[    4.452570] #PF: error_code(0x0002) - not-present page
[    4.452606] PGD 0 P4D 0 
[    4.452624] Oops: Oops: 0002 [#1] SMP
[    4.452661] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    4.452732] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.452774] Workqueue: netns cleanup_net
[    4.452814] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.452863] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 <f0> 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41
[    4.452985] RSP: 0018:ffffb86900257bb8 EFLAGS: 00010046
[    4.453020] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    4.453079] RDX: ffffb86900257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.453132] RBP: ffffb86900257bf0 R08: ffff88e0413ab673 R09: 0000000000000002
[    4.453184] R10: ffff88e07c828840 R11: ffff88e0413aae90 R12: 0000000000000000
[    4.453237] R13: ffffb86900257ce8 R14: 0000000000000020 R15: ffffb86900257df0
[    4.453291] FS:  0000000000000000(0000) GS:ffff88e0cc591000(0000) knlGS:0000000000000000
[    4.453357] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.453403] CR2: 0000000000000000 CR3: 000000003e246002 CR4: 0000000000772ef0
[    4.453462] PKRU: 55555554
[    4.453478] Call Trace:
[    4.453497]  <TASK>
[    4.453525]  __cancel_work+0x29/0xe0
[    4.453560]  ? queue_delayed_work_on+0x54/0x60
[    4.453595]  __cancel_work_sync+0x16/0x80
[    4.453622]  __dev_close_many+0x113/0x2b0
[    4.453661]  netif_close_many+0x98/0x160
[    4.453703]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    4.453745]  ? unregister_netdevice_queue+0x29/0xe0
[    4.453780]  default_device_exit_batch+0x29b/0x300
[    4.453815]  ? mutex_lock+0x12/0x30
[    4.453851]  ops_undo_list+0xec/0x1f0
[    4.453884]  cleanup_net+0x1b7/0x300
[    4.453918]  process_one_work+0x162/0x380
[    4.453947]  worker_thread+0x299/0x3c0
[    4.453982]  ? rescuer_thread+0x4c0/0x4c0
[    4.454010]  kthread+0x101/0x1f0
[    4.454048]  ? kthreads_online_cpu+0x110/0x110
[    4.454097]  ? kthreads_online_cpu+0x110/0x110
[    4.454141]  ret_from_fork+0x11c/0x140
[    4.454168]  ? kthreads_online_cpu+0x110/0x110
[    4.454205]  ret_from_fork_asm+0x11/0x20
[    4.454244]  </TASK>
[    4.454261] Modules linked in:
[    4.454300] CR2: 0000000000000000
[    4.454333] ---[ end trace 0000000000000000 ]---
[    4.454374] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    4.454418] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 <f0> 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41
[    4.454552] RSP: 0018:ffffb86900257bb8 EFLAGS: 00010046
[    4.454587] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 0000000000000800
[    4.454639] RDX: ffffb86900257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    4.454694] RBP: ffffb86900257bf0 R08: ffff88e0413ab673 R09: 0000000000000002
[    4.454745] R10: ffff88e07c828840 R11: ffff88e0413aae90 R12: 0000000000000000
[    4.454801] R13: ffffb86900257ce8 R14: 0000000000000020 R15: ffffb86900257df0
[    4.454855] FS:  0000000000000000(0000) GS:ffff88e0cc591000(0000) knlGS:0000000000000000
[    4.454914] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.454965] CR2: 0000000000000000 CR3: 000000003e246002 CR4: 0000000000772ef0
[    4.455019] PKRU: 55555554
[    4.455036] note: kworker/u16:1[67] exited with irqs disabled