Re: [libvirt] timing issues of calling virsh on the command line

On Sat, Nov 07, 2009 at 10:24:30AM -0500, David Wilcox wrote: > Hi, > > I've encountered some concurrency issues when calling virsh in a script. If > I try to restore a VM too soon after it's been saved, libvirtd will stop > responding. As well, if I try to save a VM too soon after it's been > restored, libvirtd will stop responding. First what version are you using ? What kind of domains, what versions of the hypervisor etc ... Second assuming something recent, could you run /usr/sbin/libvirtd under gdb, then reproduce the problem and provide a stack trace ? See the end of https://fedoraproject.org/wiki/How_to_debug_Libvirt_problems for detailed informations If libvirtd is not responding it's very probably crashed, and we need to fix the crash. > At the moment, I am not using any type of wait in my program for virsh to > come back. I merely let the system call run its course and I assume that > virsh will return when it's done waiting. > > Is there any type of wait that needs to occur in order to avoid these > concurrency issues? The operation should be synchronous, so no wait should be needed something is behaving. Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/