the backtrace as follows：
[   72.571019] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   72.571084] #PF: supervisor instruction fetch in kernel mode
[   72.571128] #PF: error_code(0x0010) - not-present page
[   72.571167] PGD 0 P4D 0 
[   72.571190] Oops: 0010 [#1] PREEMPT SMP NOPTI
[   72.571225] CPU: 2 PID: 358 Comm: kworker/u8:3 Kdump: loaded Not tainted 6.8.0-31-generic #31-Ubuntu
[   72.571344] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[   72.571386] RIP: 0010:0x0
[   72.571417] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
[   72.571468] RSP: 0018:ffffb0c880307a80 EFLAGS: 00010216
[   72.571508] RAX: 0000000000000000 RBX: ffff8af8c1b08800 RCX: 0000000000000000
[   72.571561] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8af8c1b08800
[   72.571616] RBP: ffffb0c880307ab8 R08: 0000000000000000 R09: 0000000000000000
[   72.571667] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8af8c550c700
[   72.571717] R13: ffff8af8c1b08b28 R14: ffff8af8c550c200 R15: 0000000000000080
[   72.571768] FS:  0000000000000000(0000) GS:ffff8af9e8100000(0000) knlGS:0000000000000000
[   72.571825] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   72.571867] CR2: ffffffffffffffd6 CR3: 000000014f23c006 CR4: 00000000007706f0
[   72.571921] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   72.571972] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   72.572023] PKRU: 55555554
[   72.572046] Call Trace:
[   72.572068]  <TASK>
[   72.572087]  ? show_regs+0x6d/0x80
[   72.572117]  ? __die+0x24/0x80
[   72.572144]  ? page_fault_oops+0x99/0x1b0
[   72.572177]  ? do_user_addr_fault+0x2ee/0x6b0
[   72.572211]  ? exc_page_fault+0x83/0x1b0
[   72.572244]  ? asm_exc_page_fault+0x27/0x30
[   72.572279]  vp_del_vqs+0x6e/0x2a0
[   72.572308]  remove_vq_common+0x166/0x1a0
[   72.572341]  virtnet_remove+0x61/0x80
[   72.572370]  virtio_dev_remove+0x3f/0xc0
[   72.572402]  device_remove+0x40/0x80
[   72.572433]  device_release_driver_internal+0x20b/0x270
[   72.572477]  device_release_driver+0x12/0x20
[   72.572510]  bus_remove_device+0xcb/0x140
[   72.572542]  device_del+0x161/0x3e0
[   72.572571]  ? pci_bus_generic_read_dev_vendor_id+0x2c/0x1a0
[   72.572617]  device_unregister+0x17/0x60
[   72.572648]  unregister_virtio_device+0x16/0x40
[   72.572684]  virtio_pci_remove+0x43/0xa0
[   72.572714]  pci_device_remove+0x36/0xb0
[   72.572746]  device_remove+0x40/0x80
[   72.572919]  device_release_driver_internal+0x20b/0x270
[   72.573083]  device_release_driver+0x12/0x20
[   72.573241]  pci_stop_bus_device+0x7a/0xb0
[   72.573394]  pci_stop_and_remove_bus_device+0x12/0x30
[   72.573552]  disable_slot+0x4f/0xa0
[   72.573705]  acpiphp_disable_and_eject_slot+0x1c/0xa0
[   72.573860]  hotplug_event+0x11b/0x280
[   72.574006]  ? __pfx_acpiphp_hotplug_notify+0x10/0x10
[   72.574159]  acpiphp_hotplug_notify+0x27/0x70
[   72.574304]  acpi_device_hotplug+0xb6/0x300
[   72.574452]  acpi_hotplug_work_fn+0x1e/0x40
[   72.574598]  process_one_work+0x16c/0x350
[   72.574742]  worker_thread+0x306/0x440
[   72.574878]  ? _raw_spin_lock_irqsave+0xe/0x20
[   72.575017]  ? __pfx_worker_thread+0x10/0x10
[   72.575152]  kthread+0xef/0x120
[   72.575285]  ? __pfx_kthread+0x10/0x10
[   72.575414]  ret_from_fork+0x44/0x70
[   72.575548]  ? __pfx_kthread+0x10/0x10
[   72.575677]  ret_from_fork_asm+0x1b/0x30
[   72.575803]  </TASK>


When the code reaches if (vp_dev->is_avq(vdev, vq->index)), due to is_avq not being correctly initialized in the legacy virtio device, it becomes a null pointer, resulting in an exception being thrown.