[    2.067683] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.067768] #PF: supervisor write access in kernel mode
[    2.067807] #PF: error_code(0x0002) - not-present page
[    2.067851] PGD 0 P4D 0 
[    2.067869] Oops: Oops: 0002 [#1] SMP
[    2.067906] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.067983] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.068028] Workqueue: netns cleanup_net
[    2.068075] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.068125] 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
[    2.068262] RSP: 0000:ffffade2c0067bb8 EFLAGS: 00010046
[    2.068303] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.068359] RDX: ffffade2c0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.068412] RBP: ffffade2c0067bf0 R08: ffffffff97693e00 R09: 0000000000000101
[    2.068468] R10: ffffffff982080d8 R11: ffffade2c0003ff8 R12: 0000000000000000
[    2.068527] R13: ffffade2c0067ce8 R14: 0000000000000020 R15: ffffade2c0067df0
[    2.068593] FS:  0000000000000000(0000) GS:ffff933126191000(0000) knlGS:0000000000000000
[    2.068661] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.068718] CR2: 0000000000000000 CR3: 0000000003246004 CR4: 0000000000772ef0
[    2.068773] PKRU: 55555554
[    2.068795] Call Trace:
[    2.068816]  <TASK>
[    2.068847]  __cancel_work+0x29/0xe0
[    2.068883]  ? dev_deactivate_many+0x2c9/0x300
[    2.068930]  __cancel_work_sync+0x16/0x80
[    2.068967]  __dev_close_many+0x113/0x2b0
[    2.069002]  netif_close_many+0x98/0x160
[    2.069034]  unregister_netdevice_many_notify+0x10c/0xaa0
[    2.069081]  ? unregister_netdevice_queue+0x29/0xe0
[    2.069134]  default_device_exit_batch+0x29b/0x300
[    2.069175]  ? mutex_lock+0x12/0x30
[    2.069206]  ops_undo_list+0xec/0x1f0
[    2.069232]  cleanup_net+0x1b7/0x300
[    2.069265]  process_one_work+0x162/0x380
[    2.069296]  worker_thread+0x299/0x3c0
[    2.069329]  ? rescuer_thread+0x4c0/0x4c0
[    2.069361]  kthread+0x101/0x1f0
[    2.069392]  ? kthreads_online_cpu+0x110/0x110
[    2.069427]  ? kthreads_online_cpu+0x110/0x110
[    2.069469]  ret_from_fork+0x11c/0x140
[    2.069506]  ? kthreads_online_cpu+0x110/0x110
[    2.069541]  ret_from_fork_asm+0x11/0x20
[    2.069582]  </TASK>
[    2.069603] Modules linked in:
[    2.069636] CR2: 0000000000000000
[    2.069666] ---[ end trace 0000000000000000 ]---
[    2.069709] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.069754] 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
[    2.069903] RSP: 0000:ffffade2c0067bb8 EFLAGS: 00010046
[    2.069942] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.070000] RDX: ffffade2c0067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.070061] RBP: ffffade2c0067bf0 R08: ffffffff97693e00 R09: 0000000000000101
[    2.070114] R10: ffffffff982080d8 R11: ffffade2c0003ff8 R12: 0000000000000000
[    2.070177] R13: ffffade2c0067ce8 R14: 0000000000000020 R15: ffffade2c0067df0
[    2.070235] FS:  0000000000000000(0000) GS:ffff933126191000(0000) knlGS:0000000000000000
[    2.070293] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.070336] CR2: 0000000000000000 CR3: 0000000003246004 CR4: 0000000000772ef0
[    2.070395] PKRU: 55555554
[    2.070416] note: kworker/u16:0[12] exited with irqs disabled