Public bug reported:
I just upgraded my VM-host from 14.04 (trusty) to 16.04 (xenial) with
qemu version 1:2.5+dfsg-5ubuntu10.2, and noticed that VMs with more than
one NIC would not start. I'm controlling my VMs using libvirt, and
noticed this message in the log:
libvirtd[6335]: internal error: process exited while connecting to
monitor: 2016-07-08T11:07:10.097780Z qemu-system-x86_64: -device virtio-
net-pci,netdev=hostnet1,id=net1,mac=<redacted>,bus=pci.0,addr=0x4:
duplicate fw_cfg file name: genroms/pxe-virtio.rom
Experimenting using the qemu command line logged by libvirt, I determined that
removing all NICs but one would let me start VMs. I created this minimal
example to replicate the behaviour:
$ sudo /usr/bin/kvm -nographic -machine pc-0.11,accel=kvm,usb=off -netdev
tap,id=hostnet0,vhost=on -device
virtio-net-pci,netdev=hostnet0,id=net0,bus=pci.0,addr=0x3 -netdev
tap,id=hostnet1,vhost=on -device
virtio-net-pci,netdev=hostnet1,id=net1,bus=pci.0,addr=0x4
qemu-system-x86_64: -device
virtio-net-pci,netdev=hostnet1,id=net1,bus=pci.0,addr=0x4: duplicate fw_cfg
file name: genroms/pxe-virtio.rom
Removing one NIC makes this setup work just fine:
$ sudo /usr/bin/kvm -nographic -machine pc-0.11,accel=kvm,usb=off -netdev
tap,id=hostnet0,vhost=on -device
virtio-net-pci,netdev=hostnet0,id=net0,bus=pci.0,addr=0x3
[abort using 'ctrl-a', followed by 'x']
To verify that this was not due to the upgrade process, I have also
booted a Live CD of the Desktop version of Xenial, and reproduced the
error there successfully.
To try and mitigate the issue, I did download the source for the qemu
package and did a dirty workaround by replacing the exit(1) below the
error message with return, but the real issue seems to be that qemu
tries to re-add the fw_cfgs for each NIC defined on the command line.
Thanks,
/Jonas
** Affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1600431
Title:
qemu fails when starting with more than one virtual NIC
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