[Qemu-devel] Re: [Bug 595438] Re: KVM segmentation fault, using SCSI+writeback and linux 2.4 guest

[Serge Hallyn <595438@bugs.launchpad.net>]

Could you test qemu-kvm_0.12.3+noroms-0ubuntu10 from
ppa:serge-hallyn/virt?  If this fixes your problem then I will
propose it for merge.

-- 
KVM segmentation fault, using SCSI+writeback and linux 2.4 guest
https://bugs.launchpad.net/bugs/595438
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Status in Kernel Virtual Machine: Confirmed
Status in QEMU: Fix Committed
Status in qemu-kvm: Confirmed

Bug description:
I Use Ubuntu 32 bit 10.04 with standard KVM.
I have Intel 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 I choose scsi virtual disk and writeback simultaneously. 
But, writeback+ide, writethrough+scsi works OK.

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

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