On Mon, Aug 16, 2021 at 11:04:12 +0800, 13520781...@189.cn wrote: > > Hello, > > I have meet one issues while using snapshot-create-as with external file. > > Centos 8, > Libivirt 7.0.0 > Qemu: 5.2.0 > > While making one snapshot with memory and disk extaernal file, and killing > the process of the vm qemu same time mostly, the snapshot-create-as command > blocked. > So it will failed to start the vm again for "cannot acquire state change > lock (held by monitor=remoteDispatchDomainSnapshotCreateXML)".
[...] > > > The call work flow one is: > qemuSnapshotCreateActiveExternal -> qemuSaveImageCreate -> > qemuMigrationSrcToFile -> qemuMigrationSrcWaitForCompletion -> > virDomainObjWait > > The others is similar : > qemuSnapshotCreateXML －＞ ．．． > > > It may be resume after the restart libvirtd.service. > > Is it correct that the stat change lock should be unlocked while the vm is > terminal or shutdown and how to fix it? The function handling the shutdown of the monitor is supposed to wake up all waiting threads, which should prevent such a problem. In this case the log attached is not enough to see what's really happening, so please attach a full debug log and ideally report the issue in our gitlab issue tracker: https://gitlab.com/libvirt/libvirt/-/issues/new Guidance on how to setup logging for debugging can be found at: https://libvirt.org/kbase/debuglogs.html#less-verbose-logging-for-qemu-vms
