[    2.857253] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.857338] #PF: supervisor write access in kernel mode
[    2.857385] #PF: error_code(0x0002) - not-present page
[    2.857436] PGD 0 P4D 0 
[    2.857461] Oops: Oops: 0002 [#1] SMP
[    2.857500] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.857595] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.857659] Workqueue: netns cleanup_net
[    2.857709] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.857774] 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
[    2.857951] RSP: 0018:ffffb4bdc0067bb8 EFLAGS: 00010046
[    2.858000] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.858081] RDX: ffffb4bdc0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.858157] RBP: ffffb4bdc0067bf0 R08: ffffffffb68779b0 R09: 0000000000000101
[    2.858232] R10: ffffffffb70080d8 R11: ffffb4bdc0003ff8 R12: 0000000000000000
[    2.858308] R13: ffffb4bdc0067ce8 R14: 0000000000000020 R15: ffffb4bdc0067df0
[    2.858387] FS:  0000000000000000(0000) GS:ffff8d63873c1000(0000) knlGS:0000000000000000
[    2.858468] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.858526] CR2: 0000000000000000 CR3: 0000000002fc9003 CR4: 0000000000772ef0
[    2.858603] PKRU: 55555554
[    2.858626] Call Trace:
[    2.858653]  <TASK>
[    2.858687]  __cancel_work+0x29/0xe0
[    2.858729]  ? dev_deactivate_many+0x2c9/0x300
[    2.858787]  __cancel_work_sync+0x16/0x80
[    2.858825]  __dev_close_many+0x11b/0x280
[    2.858870]  netif_close_many+0x98/0x160
[    2.858913]  ? rcu_barrier_entrain+0xb0/0xb0
[    2.858985]  unregister_netdevice_many_notify+0x1d8/0xa50
[    2.859043]  default_device_exit_batch+0x29b/0x300
[    2.859094]  ops_undo_list+0xec/0x1f0
[    2.859138]  cleanup_net+0x1b7/0x2b0
[    2.859174]  process_one_work+0x162/0x380
[    2.859212]  worker_thread+0x299/0x3c0
[    2.859248]  ? rescuer_thread+0x4c0/0x4c0
[    2.859285]  kthread+0x101/0x1f0
[    2.859323]  ? kthreads_online_cpu+0x110/0x110
[    2.859372]  ? kthreads_online_cpu+0x110/0x110
[    2.859420]  ret_from_fork+0x11c/0x140
[    2.859455]  ? kthreads_online_cpu+0x110/0x110
[    2.859493]  ret_from_fork_asm+0x11/0x20
[    2.859528]  </TASK>
[    2.859551] Modules linked in:
[    2.859596] CR2: 0000000000000000
[    2.859627] ---[ end trace 0000000000000000 ]---
[    2.859665] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.859703] 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
[    2.859817] RSP: 0018:ffffb4bdc0067bb8 EFLAGS: 00010046
[    2.859850] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.859900] RDX: ffffb4bdc0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.859950] RBP: ffffb4bdc0067bf0 R08: ffffffffb68779b0 R09: 0000000000000101
[    2.860006] R10: ffffffffb70080d8 R11: ffffb4bdc0003ff8 R12: 0000000000000000
[    2.860055] R13: ffffb4bdc0067ce8 R14: 0000000000000020 R15: ffffb4bdc0067df0
[    2.860105] FS:  0000000000000000(0000) GS:ffff8d63873c1000(0000) knlGS:0000000000000000
[    2.860160] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.860205] CR2: 0000000000000000 CR3: 0000000002fc9003 CR4: 0000000000772ef0
[    2.860262] PKRU: 55555554
[    2.860284] note: kworker/u16:0[12] exited with irqs disabled