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[libvirt] [BUG] Managed save qemu state gets deleted after failed resume



Hello,

I haven't had time to provide a fix, but still want you to inform you about a 
bug: If resuming a saved VM fails with Qemu-0.14, the managed save state 
file /var/lib/libvirt/qemu/save/$VM.save is still deleted. I think it would 
be better to only delete the state after an successful resume.

/var/log/libvirt/qemu/ucs2.3-0_basis_amd64.log:
2011-03-30 09:37:56.960: starting up
LC_ALL=C PATH=/sbin:/bin:/usr/sbin:/usr/bin 
QEMU_AUDIO_DRV=none /usr/bin/kvm -S
-M pc-0.14 -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -name
ucs2.3-0_basis_amd64 -uuid 656957aa-13a0-6922-5d08-3a39561f9775 -nodefconfig
-nodefaults -chardev
socket,id=monitor,path=/var/lib/libvirt/qemu/ucs2.3-0_basis_amd64.monitor,server,nowait
-mon chardev=monitor,mode=readline -rtc base=utc -boot cnd -drive
file=/var/lib/libvirt/images/ucs_2.3-0-091215-dvd-amd64.iso,if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw
-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive
file=/var/lib/libvirt/images/ucs230basis.qcow2,if=none,id=drive-ide0-0-1,format=qcow2
-device ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev
tap,fd=24,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:12:7c:03,bus=pci.0,addr=0x3 -usb
-device usb-tablet,id=input0 -vnc 0.0.0.0:5 -k de -vga cirrus -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -option-rom
/usr/share/kvm/pxe-rtl8139.bin
Failed to allocate 2147483648 B: Cannot allocate memory

/var/log/univention/virtual-machine-manager-daemon-errors.log:
libvir: QEMU error : operation failed: migration to 'exec:cat | { dd bs=4096
seek=1 if=/dev/null && dd bs=1048576; }
1<>'/var/lib/libvirt/qemu/save/ucs2.3-0_basis_amd64.save'' failed: migration
failed
libvir: QEMU error : operation failed: failed to retrieve chardev info in qemu
with 'info chardev'


This issue is tracked in our (German) bug-tracker at 
<https://forge.univention.org/bugzilla/show_bug.cgi?id=22021>

Sincerely
Philipp Hahn
-- 
Philipp Hahn           Open Source Software Engineer      hahn univention de
Univention GmbH        Linux for Your Business        fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
                                                   http://www.univention.de/

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