Libvirt has stopped working altogether on any VM (windows or linux) on the qemu/kvm networt and has the following error each time I try to start something:

error: internal error: Failed to start QEMU binary /usr/bin/qemu-system-x86_64 for probing: qemu-system-x86_64: cannot create PID file: Failed to write pid file

If I try to create a new VM on the qemu/kvm network, I'm given:

Host does not support any virtualization options

However, running and starting VM's on a qemu/kvm user session network works fine. I have also been able to use the qemu/kvm network before without problems for a long time, and I'm unsure what's triggered it to stop working now.

I have tried starting the qemu-system-x86_64 binary from a terminal and that works fine too.

How can I resolve this error?

1 Answer 1


This was solved by a helpful someone on the libvirt mailing list. My /var partition was out of space, and that's why libvirt couldn't create any PID file.

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