[    5.906385] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    5.906481] #PF: supervisor write access in kernel mode
[    5.906529] #PF: error_code(0x0002) - not-present page
[    5.906567] PGD 0 P4D 0 
[    5.906593] Oops: Oops: 0002 [#1] SMP
[    5.906638] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) 
[    5.906713] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.906785] Workqueue: netns cleanup_net
[    5.906852] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    5.906909] 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
[    5.907066] RSP: 0018:ffffbe6380067bb8 EFLAGS: 00010046
[    5.907112] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    5.907176] RDX: ffffbe6380067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    5.907236] RBP: ffffbe6380067bf0 R08: ffffffff9f893e00 R09: 0000000000000101
[    5.907298] R10: ffffffffa04080d8 R11: ffffbe6380003ff8 R12: 0000000000000000
[    5.907355] R13: ffffbe6380067ce8 R14: 0000000000000020 R15: ffffbe6380067df0
[    5.907418] FS:  0000000000000000(0000) GS:ffff9eddddf91000(0000) knlGS:0000000000000000
[    5.907483] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.907540] CR2: 0000000000000000 CR3: 000000000a446006 CR4: 0000000000772ef0
[    5.907607] PKRU: 55555554
[    5.907644] Call Trace:
[    5.907671]  <TASK>
[    5.907703]  __cancel_work+0x29/0xe0
[    5.907747]  ? dev_deactivate_many+0x2c9/0x300
[    5.907800]  __cancel_work_sync+0x16/0x80
[    5.907839]  __dev_close_many+0x113/0x2b0
[    5.907891]  netif_close_many+0x98/0x160
[    5.907926]  unregister_netdevice_many_notify+0x1ea/0xaa0
[    5.907979]  default_device_exit_batch+0x29b/0x300
[    5.908025]  ? mutex_lock+0x12/0x30
[    5.908072]  ops_undo_list+0xec/0x1f0
[    5.908114]  cleanup_net+0x1b7/0x300
[    5.908152]  process_one_work+0x162/0x380
[    5.908189]  worker_thread+0x299/0x3c0
[    5.908228]  ? rescuer_thread+0x4c0/0x4c0
[    5.908263]  kthread+0x101/0x1f0
[    5.908300]  ? kthreads_online_cpu+0x110/0x110
[    5.908343]  ? kthreads_online_cpu+0x110/0x110
[    5.908388]  ret_from_fork+0x11c/0x140
[    5.908433]  ? kthreads_online_cpu+0x110/0x110
[    5.908476]  ret_from_fork_asm+0x11/0x20
[    5.908520]  </TASK>
[    5.908544] Modules linked in:
[    5.908578] CR2: 0000000000000000
[    5.908616] ---[ end trace 0000000000000000 ]---
[    5.908667] RIP: 0010:work_grab_pending+0x2f/0x1b0
[    5.908709] 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
[    5.908869] RSP: 0018:ffffbe6380067bb8 EFLAGS: 00010046
[    5.908917] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000ffffffff
[    5.908984] RDX: ffffbe6380067bf0 RSI: 0000000000000000 RDI: 0000000000000000
[    5.909045] RBP: ffffbe6380067bf0 R08: ffffffff9f893e00 R09: 0000000000000101
[    5.909109] R10: ffffffffa04080d8 R11: ffffbe6380003ff8 R12: 0000000000000000
[    5.909164] R13: ffffbe6380067ce8 R14: 0000000000000020 R15: ffffbe6380067df0
[    5.909224] FS:  0000000000000000(0000) GS:ffff9eddddf91000(0000) knlGS:0000000000000000
[    5.909292] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.909351] CR2: 0000000000000000 CR3: 000000000a446006 CR4: 0000000000772ef0
[    5.909418] PKRU: 55555554
[    5.909440] note: kworker/u16:0[12] exited with irqs disabled