[    3.964235] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    3.964320] #PF: supervisor write access in kernel mode
[    3.964368] #PF: error_code(0x0002) - not-present page
[    3.964411] PGD 0 P4D 0 
[    3.964439] Oops: Oops: 0002 [#1] SMP
[    3.964479] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    3.964559] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.964622] Workqueue: netns cleanup_net
[    3.964666] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.964723] 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
[    3.964885] RSP: 0018:ffffae654024fbb8 EFLAGS: 00010046
[    3.964930] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    3.964998] RDX: ffffae654024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.965065] RBP: ffffae654024fbf0 R08: ffffffff97493e00 R09: 0000000000000101
[    3.965131] R10: ffffffff980080d8 R11: ffffae6540003ff8 R12: 0000000000000000
[    3.965204] R13: ffffae654024fce8 R14: 0000000000000020 R15: ffffae654024fdf0
[    3.965273] FS:  0000000000000000(0000) GS:ffff89c6a6391000(0000) knlGS:0000000000000000
[    3.965344] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.965405] CR2: 0000000000000000 CR3: 0000000004b00004 CR4: 0000000000772ef0
[    3.965479] PKRU: 55555554
[    3.965506] Call Trace:
[    3.965529]  <TASK>
[    3.965552]  __cancel_work+0x29/0xe0
[    3.965589]  ? dev_deactivate_many+0x2c9/0x300
[    3.965640]  __cancel_work_sync+0x16/0x80
[    3.965680]  __dev_close_many+0x113/0x2b0
[    3.965721]  netif_close_many+0x98/0x160
[    3.965761]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    3.965812]  default_device_exit_batch+0x29b/0x300
[    3.965862]  ? mutex_lock+0x12/0x30
[    3.965902]  ops_undo_list+0xec/0x1f0
[    3.965943]  cleanup_net+0x1b7/0x300
[    3.965981]  process_one_work+0x162/0x380
[    3.966022]  worker_thread+0x299/0x3c0
[    3.966062]  ? rescuer_thread+0x4c0/0x4c0
[    3.966101]  kthread+0x101/0x1f0
[    3.966141]  ? kthreads_online_cpu+0x110/0x110
[    3.966191]  ? kthreads_online_cpu+0x110/0x110
[    3.966242]  ret_from_fork+0x11c/0x140
[    3.966282]  ? kthreads_online_cpu+0x110/0x110
[    3.966327]  ret_from_fork_asm+0x11/0x20
[    3.966370]  </TASK>
[    3.966395] Modules linked in:
[    3.966429] CR2: 0000000000000000
[    3.966467] ---[ end trace 0000000000000000 ]---
[    3.966512] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    3.966563] 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
[    3.966719] RSP: 0018:ffffae654024fbb8 EFLAGS: 00010046
[    3.966769] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    3.966836] RDX: ffffae654024fbf0 RSI: 0000000000000000 RDI: 0000000000000000
[    3.966903] RBP: ffffae654024fbf0 R08: ffffffff97493e00 R09: 0000000000000101
[    3.966969] R10: ffffffff980080d8 R11: ffffae6540003ff8 R12: 0000000000000000
[    3.967042] R13: ffffae654024fce8 R14: 0000000000000020 R15: ffffae654024fdf0
[    3.967110] FS:  0000000000000000(0000) GS:ffff89c6a6391000(0000) knlGS:0000000000000000
[    3.967183] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.967244] CR2: 0000000000000000 CR3: 0000000004b00004 CR4: 0000000000772ef0
[    3.967313] PKRU: 55555554
[    3.967340] note: kworker/u16:1[66] exited with irqs disabled