Comment 11 for bug 1441047

Without much information, this looks to me like it might be I/O issues with the fc controller itself; or perhaps with how much memory is required to support the VMs as they are defined (I see some memory allocation errors for vfio, but it's not clear which test relates to which actual entry in Qemu logs).

If the same test is tried with fewer disks, does the VM behave the same way? I've run some tests here which seemed to indicate multipathed systems with up to around 52 disks (the extent of my test), on amd64 and using virtio disks did work (even if multipath was disabled, and thus showing the 52 or so disks), but that's hardly reproducing the setup you have here.

I would suggest if possible to test with fewer disks (perhaps starting with 20 instead of 40?), so that we can identify whether there is a cutoff point at which the VM works or doesn't, since it reportedly works fine with just the boot disk.