Hi, We are using KVM (kernel version 3.12) and QEMU 2.0.0. We can execute snapshots of machines that have only a root volume. But when adding extra volumes, things get weird. When one volume is attached, making a snapshot of the volume fails every other time. Adding more volumes causes the machine to start crashing as a result of the snapshot process.
We have traced the CloudStack code execution down to KVMStoreProcessor's createSnapshot method: https://github.com/apache/cloudstack/blob/4.2/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/KVMStorageProcessor.java#L1067 When this runs, we see an "Error while creating snapshot" in the libvirt logs, and not much else. Increasing the verbosity of the libvirt logs doesn't really help either. We did notice that it gets an invalid pointer error at the time it crashes, and we also noticed an error like this: > kernel: Clocksource tsc unstable (delta = xxxxx ms) every time it creates a snapshot. But we're pretty sure that has nothing to do with it and is just a warning. Anyone have ideas on this?
