[SOLVED] Manually modifying qm.conf file from 'virtio-scsi-pci' to 'virtio-scsi-single' crashes PVE networking

[Giovanni]

Edit: this system crash was due to IOMMU isolation being broken on my AMD cpu requiring `
pcie_acs_override=downstream,multifunction` to fix it.

The system was hanging due to shared group with a core controller for the PCI bus on the board for a pass thru device.