Hi. On Tue, Oct 16, 2012 at 16:20:59 +0200, Guido Winkelmann wrote: > After recently upgrading to 0.9.11 (as shipped with Fedora 17), I was just > trying to migrate a qemu domain from one host to another (using > virDomainMigrateToURI()), when I got this error message: > > Unsafe migration: Migration may lead to data corruption if disks use cache > != none > > Okay, this is explainable (if a bit disappointing - I would have hoped > that > qemu would be able to disable disk caches before migration and then > reenable them afterwards...). However, the next time I tried migrating > the same domain, I got this error message after about 30 seconds: > > Timed out during operation: cannot acquire state change lock Oops, that's a longstanding bug which hasn't been noticed until now. Thanks for reporting it. Luckily, the fix is trivial: https://www.redhat.com/archives/libvir-list/2012-October/msg00891.html