Re: blockcommit --pivot does not succeed in conjunction with qemu 5.0.0

On Fri, May 08, 2020 at 13:05:01 +0200, Thomas Stein wrote: > > Maybe: > > from 6.3.0 release notes: > > - qemu: Fix domain restore from a block device > When using namespaces, libvirt was unable to restore a domain from > a > block device because libvirt tried to relabel the device inside the > namespace while QEMU was given FD to the block device in the host. This is not relevant to block commit in any way.

> > cheers, t. > > On 2020-05-08 12:48, Thomas Stein wrote: > > Hello one and all. > > > > Got a problem with libvirt 6.2.0 and qemu 5.0.0. > > > > virsh blockcommit mymachine vda --active --verbose --pivot > > > > works until it shows [100%] but it never actually pivots. It just sits > > there. Is this a known issue with 6.2.0 and i should > > try 6.3.0? For now i switched back to qemu 4.2.0 and this seems to > > solve the issue too. Any hints? It's hard to tell from this description. It's certainly not something I've heard of. Both qemu-5.0 and qemu-4.2 allow libvirt to use -blockdev way to configure disks where a lot changed compared to previous versions but since those two versions both use blockdev it should work the same. It kind of looks as a problem in qemu but can't tell more without debug logs. Please follow the steps here https://wiki.libvirt.org/page/DebugLogs and reproduce the bug. I can then look at the log file and see whether I see some anomalies.