[    2.939324] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.939393] #PF: supervisor write access in kernel mode
[    2.939437] #PF: error_code(0x0002) - not-present page
[    2.939478] PGD 0 P4D 0 
[    2.939498] Oops: Oops: 0002 [#1] SMP
[    2.939530] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.939605] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.939649] Workqueue: netns cleanup_net
[    2.939691] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.939736] 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
[    2.939864] RSP: 0018:ffffaca6c0257bb8 EFLAGS: 00010046
[    2.939906] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 000000000000000a
[    2.939958] RDX: ffffaca6c0257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.940028] RBP: ffffaca6c0257bf0 R08: 0000000000000000 R09: ffffffffc0400100
[    2.940088] R10: ffffa04e83031980 R11: 0000000000000001 R12: 0000000000000000
[    2.940142] R13: ffffaca6c0257ce8 R14: 0000000000000020 R15: ffffaca6c0257df0
[    2.940196] FS:  0000000000000000(0000) GS:ffffa04f2d791000(0000) knlGS:0000000000000000
[    2.940258] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.940317] CR2: 0000000000000000 CR3: 0000000012446006 CR4: 0000000000772ef0
[    2.940372] PKRU: 55555554
[    2.940394] Call Trace:
[    2.940412]  <TASK>
[    2.940436]  __cancel_work+0x29/0xe0
[    2.940483]  ? dev_deactivate_many+0x2c9/0x300
[    2.940531]  __cancel_work_sync+0x16/0x80
[    2.940569]  __dev_close_many+0x113/0x2b0
[    2.940611]  netif_close_many+0x98/0x160
[    2.940644]  unregister_netdevice_many_notify+0x10c/0xaa0
[    2.940688]  default_device_exit_batch+0x29b/0x300
[    2.940725]  ? mutex_lock+0x12/0x30
[    2.940763]  ops_undo_list+0xec/0x1f0
[    2.940789]  cleanup_net+0x1b7/0x300
[    2.940822]  process_one_work+0x162/0x380
[    2.940857]  worker_thread+0x299/0x3c0
[    2.940883]  ? rescuer_thread+0x4c0/0x4c0
[    2.940923]  kthread+0x101/0x1f0
[    2.940958]  ? kthreads_online_cpu+0x110/0x110
[    2.941003]  ? kthreads_online_cpu+0x110/0x110
[    2.941057]  ret_from_fork+0x11c/0x140
[    2.941098]  ? kthreads_online_cpu+0x110/0x110
[    2.941136]  ret_from_fork_asm+0x11/0x20
[    2.941172]  </TASK>
[    2.941194] Modules linked in: sch_fq
[    2.941224] CR2: 0000000000000000
[    2.941250] ---[ end trace 0000000000000000 ]---
[    2.941292] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.941328] 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
[    2.941450] RSP: 0018:ffffaca6c0257bb8 EFLAGS: 00010046
[    2.941501] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 000000000000000a
[    2.941554] RDX: ffffaca6c0257bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.941609] RBP: ffffaca6c0257bf0 R08: 0000000000000000 R09: ffffffffc0400100
[    2.941672] R10: ffffa04e83031980 R11: 0000000000000001 R12: 0000000000000000
[    2.941730] R13: ffffaca6c0257ce8 R14: 0000000000000020 R15: ffffaca6c0257df0
[    2.941786] FS:  0000000000000000(0000) GS:ffffa04f2d791000(0000) knlGS:0000000000000000
[    2.941845] CS:  0010 DS: 000