[    2.261597] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.261693] #PF: supervisor write access in kernel mode
[    2.261752] #PF: error_code(0x0002) - not-present page
[    2.261809] PGD 0 P4D 0 
[    2.261838] Oops: Oops: 0002 [#1] SMP
[    2.261881] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.261995] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.262071] Workqueue: netns cleanup_net
[    2.262122] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.262186] 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
[    2.262393] RSP: 0018:ffffa837c024fbb8 EFLAGS: 00010046
[    2.262456] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.262541] RDX: ffffa837c024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.262628] RBP: ffffa837c024fbf0 R08: ffffffffac893e00 R09: 0000000000000101
[    2.262713] R10: ffffffffad4080d8 R11: ffffa837c0003ff8 R12: 0000000000000000
[    2.262803] R13: ffffa837c024fce8 R14: 0000000000000020 R15: ffffa837c024fdf0
[    2.262893] FS:  0000000000000000(0000) GS:ffff8bb250f91000(0000) knlGS:0000000000000000
[    2.262979] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.263051] CR2: 0000000000000000 CR3: 0000000014446002 CR4: 0000000000772ef0
[    2.263140] PKRU: 55555554
[    2.263169] Call Trace:
[    2.263201]  <TASK>
[    2.263230]  __cancel_work+0x29/0xe0
[    2.263281]  ? dev_deactivate_many+0x2c9/0x300
[    2.263345]  __cancel_work_sync+0x16/0x80
[    2.263395]  __dev_close_many+0x113/0x2b0
[    2.263439]  netif_close_many+0x98/0x160
[    2.263482]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    2.263538]  default_device_exit_batch+0x29b/0x300
[    2.263597]  ? mutex_lock+0x12/0x30
[    2.263651]  ops_undo_list+0xec/0x1f0
[    2.263697]  cleanup_net+0x1b7/0x300
[    2.263745]  process_one_work+0x162/0x380
[    2.263788]  worker_thread+0x299/0x3c0
[    2.263831]  ? rescuer_thread+0x4c0/0x4c0
[    2.263881]  kthread+0x101/0x1f0
[    2.263925]  ? kthreads_online_cpu+0x110/0x110
[    2.263985]  ? kthreads_online_cpu+0x110/0x110
[    2.264050]  ret_from_fork+0x11c/0x140
[    2.264103]  ? kthreads_online_cpu+0x110/0x110
[    2.264160]  ret_from_fork_asm+0x11/0x20
[    2.264209]  </TASK>
[    2.264238] Modules linked in:
[    2.264280] CR2: 0000000000000000
[    2.264324] ---[ end trace 0000000000000000 ]---
[    2.264387] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.264449] 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
[    2.264652] RSP: 0018:ffffa837c024fbb8 EFLAGS: 00010046
[    2.264713] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.264803] RDX: ffffa837c024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.264891] RBP: ffffa837c024fbf0 R08: ffffffffac893e00 R09: 0000000000000101
[    2.264983] R10: ffffffffad4080d8 R11: ffffa837c0003ff8 R12: 0000000000000000
[    2.265074] R13: ffffa837c024fce8 R14: 0000000000000020 R15: ffffa837c024fdf0
[    2.265174] FS:  0000000000000000(0000) GS:ffff8bb250f91000(0000) knlGS:0000000000000000
[    2.265265] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.265338] CR2: 0000000000000000 CR3: 0000000014446002 CR4: 0000000000772ef0
[    2.265432] PKRU: 55555554
[    2.265466] note: kworker/u16:1[66] exited with irqs disabled