[    2.856581] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    2.856654] #PF: supervisor write access in kernel mode
[    2.856695] #PF: error_code(0x0002) - not-present page
[    2.856741] PGD 0 P4D 0 
[    2.856768] Oops: Oops: 0002 [#1] SMP
[    2.856805] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    2.856881] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.856930] Workqueue: netns cleanup_net
[    2.856974] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.857025] 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
[    2.857163] RSP: 0018:ffffb92f40067bb8 EFLAGS: 00010046
[    2.857204] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.857269] RDX: ffffb92f40067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.857335] RBP: ffffb92f40067bf0 R08: ffffffff9e693e00 R09: 0000000000000101
[    2.857402] R10: ffffffff9f2080d8 R11: ffffb92f40003ff8 R12: 0000000000000000
[    2.857468] R13: ffffb92f40067ce8 R14: 0000000000000020 R15: ffffb92f40067df0
[    2.857537] FS:  0000000000000000(0000) GS:ffff91129f191000(0000) knlGS:0000000000000000
[    2.857602] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.857651] CR2: 0000000000000000 CR3: 000000000b446004 CR4: 0000000000772ef0
[    2.857717] PKRU: 55555554
[    2.857750] Call Trace:
[    2.857772]  <TASK>
[    2.857797]  __cancel_work+0x29/0xe0
[    2.857833]  ? dev_deactivate_many+0x2c9/0x300
[    2.857883]  __cancel_work_sync+0x16/0x80
[    2.857918]  __dev_close_many+0x113/0x2b0
[    2.857956]  netif_close_many+0x98/0x160
[    2.857991]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    2.858038]  default_device_exit_batch+0x29b/0x300
[    2.858079]  ? mutex_lock+0x12/0x30
[    2.858121]  ops_undo_list+0xec/0x1f0
[    2.858153]  cleanup_net+0x1b7/0x300
[    2.858189]  process_one_work+0x162/0x380
[    2.858220]  worker_thread+0x299/0x3c0
[    2.858256]  ? rescuer_thread+0x4c0/0x4c0
[    2.858291]  kthread+0x101/0x1f0
[    2.858329]  ? kthreads_online_cpu+0x110/0x110
[    2.858375]  ? kthreads_online_cpu+0x110/0x110
[    2.858419]  ret_from_fork+0x11c/0x140
[    2.858461]  ? kthreads_online_cpu+0x110/0x110
[    2.858507]  ret_from_fork_asm+0x11/0x20
[    2.858548]  </TASK>
[    2.858570] Modules linked in:
[    2.858600] CR2: 0000000000000000
[    2.858630] ---[ end trace 0000000000000000 ]---
[    2.858674] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    2.858714] 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
[    2.858860] RSP: 0018:ffffb92f40067bb8 EFLAGS: 00010046
[    2.858906] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    2.858971] RDX: ffffb92f40067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    2.859036] RBP: ffffb92f40067bf0 R08: ffffffff9e693e00 R09: 0000000000000101
[    2.859097] R10: ffffffff9f2080d8 R11: ffffb92f40003ff8 R12: 0000000000000000
[    2.859156] R13: ffffb92f40067ce8 R14: 0000000000000020 R15: ffffb92f40067df0
[    2.859219] FS:  0000000000000000(0000) GS:ffff91129f191000(0000) knlGS:0000000000000000
[    2.859284] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.859339] CR2: 0000000000000000 CR3: 000000000b446004 CR4: 0000000000772ef0
[    2.859401] PKRU: 55555554
[    2.859425] note: kworker/u16:0[12] exited with irqs disabled