Comment 0 for bug 595438

I Use Ubuntu 32 bit 10.04 with standerd kvm.
I have E7600 @ 3.06GHz processor with VMX

In this system I Run:
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -M pc-0.12 -enable-kvm -m 256 -smp 1 -name spamsender -uuid b9cacd5e-08f7-41fd-78c8-89cec59af881 -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/spamsender.monitor,server,nowait -monitor chardev:monitor -boot d -drive file=/mnt/megadiff/cdiso_400_130.iso,if=ide,media=cdrom,index=2 -drive file=/home/mmarkk/spamsender2.img,if=scsi,index=0,format=qcow2,cache=writeback -net nic,macaddr=00:00:00:00:00:00,vlan=0,name=nic.0 -net tap,vlan=0,name=tap.0 -chardev pty,id=serial0 -serial chardev:serial0 -parallel none -usb -vnc 127.0.0.1:0 -vga cirrus

.iso image contain custom distro of 2.4-linux kernel based system. During install process (when .tar.gz actively unpacked), kvm dead with segmentation fault.

And ONLY when scsi virtual disk and writeback simultaneously. writeback+ide, writethrough+scsi works OK.

I use qcow2. It seems, that qcow does not have such problems.

Virtual machine get down at radom place during file copy. It seems, when qcow2 file size need to be expanded.