Cannot write data: Broken pipe when accesing libvirt from a forked process

[Josef Stribny <jstribny@xxxxxxxxxx>]

Hi all,

I am trying to add vagrant-libvirt support for landrush plugin[0] and found out that libvirt fails for me with:

Call to virConnectNumOfNetworks failed: Cannot write data: Broken pipe (Libvirt::RetrieveError)

I created a minimal reproducer that causes this:

```

#!/usr/bin/ruby

require 'libvirt'

conn = Libvirt::open("qemu:///system")

fork do

  puts conn.list_networks

end

puts conn.list_networks

```

This works just fine on my host, but fails on my virtualized guest (when using nested KVM). The journal shows

the following lines in logs:

Failed to acquire pid file '/run/user/1001/libvirt/libvirtd.pid': Resource temporarily unavailable

So the forked process here tries to access not-existing libvirtd pid file for root (1001 on the VM).

Is this a feature/bug? How can one avoid it?

Thanks everyone

Josef

[0] https://github.com/phinze/landrush/pull/124

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