Help Request: PVE 9.0.10 Host Freezes When Restarting GPU-Passthrough VM (BC160)

[Gavin766]

Hi everyone, I’m facing a frustrating issue with GPU passthrough on Proxmox VE and need some guidance. Here’s my setup and problem:

System & Hardware Details​

• Proxmox VE Version: pve-manager/9.0.10/deb1ca707ec72a89
• Kernel: Linux 6.14.11-2-pve (2025-09-12T09:46Z)
• Boot Mode: Legacy BIOS
• CPU: 40 x Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz (2 sockets)
• Passthrough GPU: AMD BC160 (Navi 12, PCIe ID: 1002:7360)
• GPU Driver in Host: vfio-pci (confirmed via lspci -vvv)

The Problem​

1. After booting the PVE host, first launch of the Windows 11 VM (with BC160 passthrough) works perfectly—no freezes, VM runs normally.
2. When I shut down the VM and try to start it a second time, the entire PVE host freezes.

I’ve verified the BC160 stays bound to vfio-pci between VM restarts, so driver unbinding isn’t the issue. Any ideas what’s causing the host freeze on the second VM launch? Thanks in advance!