Description of problem:

When running 'make check':

  170/186 test_list_devices_0
  test_list_devices_0: expected "/dev/sda" but got "/dev/sdc"
  test_list_devices_0 FAILED

When performing a simple test with guestfish:

  $ ./fish/guestfish 
  
  Welcome to guestfish, the libguestfs filesystem interactive shell for
  editing virtual machine filesystems.
  
  Type: 'help' for help with commands
        'quit' to quit the shell
  
  ><fs> alloc /tmp/test.img 10M
  ><fs> run
  ><fs> list-devices 
  /dev/hdc     <------------- Note
  /dev/vda

Version-Release number of selected component (if applicable):

libguestfs-1.0.64
qemu-system-x86-0.10.5-1.el5 (EPEL 5.3)
kvm-83-82 (RHEL 5.4 Beta)

How reproducible:

Always.

Additional info:

qemu command line:

/usr/bin/qemu -drive file=/tmp/test.img,cache=off,if=virtio \
  -m 500 \
  -no-reboot \
  -kernel /tmp/libguestfsgEFKrO/kernel \
  -initrd /tmp/libguestfsgEFKrO/initrd \
  -append 'panic=1 console=ttyS0 udevtimeout=300 noapic acpi=off cgroup_disable=memory guestfs=10.0.2.4:6666' \
  -nographic \
  -serial stdio \
  -net channel,6666:unix:/tmp/libguestfsgEFKrO/sock,server,nowait \
  -net user,vlan=0 -net nic,model=virtio,vlan=0 \
  -no-hpet \
  -rtc-td-hack

At boot the kernel says:

PIIX3: IDE controller at PCI slot 0000:00:01.1
PIIX3: chipset revision 0
PIIX3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xc008-0xc00f, BIOS settings: hdc:pio, hdd:pio
hdc: QEMU DVD-ROM, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15