Unexpected behaviour when CDROM ISO can not be read

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Hi everyone:
I had a problem yesterday with a virtual machine and I was not very
sure to whom I should report it so I much appreciate your opinion
about it.
I have a virtual machine that has a couple of CDROM drives attached
with their ISO image each. The ISOs are read from a NFS mounted
directory.

Yesterady my NFS storage failed and I turned it off. When I did that
the Guest machine got frozen, it seemed to me that it was blocked
waiting for CDROM read. In a physical CDROM if a CD can not be read
for a while it would give a read error and go on. Is this a QEMU bug ?
A KVM bug ? An "expected" behaviour ?

Environment:

Host: Proxmox VE 1.8-11 (Debian GNU/Linux 5.0)
KVM commandline version: QEMU emulator version 0.14.1 (qemu-kvm-devel)
Guest: Windows 7 professional SP 1
Executed command line:

/usr/bin/kvm -monitor unix:/var/run/qemu-server/106.mon,server,nowait
-vnc unix:/var/run/qemu-server/106.vnc,password -pidfile
/var/run/qemu-server/106.pid -daemonize -usbdevice tablet -name
machine106 -smp sockets=2,cores=2 -nodefaults -boot menu=on -vga
cirrus -tdf -k es -drive
file=/mnt/pve/NFS_iso/cd1.iso,if=ide,index=0,media=cdrom -drive
file=/mnt/pve/NFS_iso/cd2.iso,if=ide,index=2,media=cdrom -drive
file=/var/lib/vz/images/106/vm-106-disk-1.raw,if=virtio,index=0,cache=none,boot=on
-drive file=/var/lib/vz/images/106/vm-106-disk-2.raw,if=virtio,index=1,cache=none
-m 2048 -netdev
type=tap,id=vlan0d0,ifname=tap106i0d0,script=/var/lib/qemu-server/bridge-vlan,vhost=on
-device virtio-net-pci,mac=D6:59:16:B9:6A:0B,netdev=vlan0d0

Thanks.

--
Igor Blanco González
Binovo IT Human Project
e-mail: iblanco@xxxxxxxxx
Telf. :   943 493611 - 690229375
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