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QEMU 5.0: Guest VM hangs/freeze when unplugging USB device
Setup:
Host: Debian/SID, Kernel 5.6, QEMU 5.0
Guest: Windows 10 VM with PCI and USB device passthrough.
Problem: Guest VM suddenly hangs when pulling USB device out from the Host.
Observations:
- Issue appears to be related to QEMU 5.0
- It started after an upgrade to QEMU 5.0.
- Downgrading only QEMU on multiple systems fixes the issue.
- Issue is very reproducible.
- Most of the time within a few attempts of pulling/reconnecting the device.
- Issue happens with multiple devices (I did try standard HID devices, a webcam and an x-ray sensor).
- Guest just hangs.
- Display output remains on last frame shown.
- Ping to Guest immediately stops working.
- Logs in the Guest stop logging immediately.
- Host is fine and thinks the Guest is fine.
- Guest continues to show as running in "virsh list".
- No suspicious entries in the QEMU logs.
- No suspicious entries in Host syslogs/messages.
- Host can can kill guest "virsh destroy" and respawn fine.
- Issue seems widespread.
- Multiple similar reports from ProxMox users after upgrade to ProxMox 6.2 for both Windows and Linux guests (First version that uses QEMU 5.0)
https://forum.proxmox.com/threads/vm-freezes-when-disconnecting-usb-keyboard-and-mouse.70287/
https://forum.proxmox.com/threads/usb-drive-crashes-vm.70214/
https://forum.proxmox.com/threads/latest-proxmox-usb-disconnects-freeze-kvm.70398/
https://forum.proxmox.com/threads/vm-with-gpu-passthrough-freezes-when-turning-off-monitor-after-proxmox-6-2-upgrade.69821/
https://forum.proxmox.com/threads/vm-with-gpu-passthrough-freezes-when-turning-off-monitor-after-proxmox-6-2-upgrade.69824/
I'd be more than happy any debugs that might be helpful.
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