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...te QEMU agent command 'guest-fsfreeze-freeze': failed to freeze /: Device or resource busy" I don't think this is not some sort of time-out error, because activation of the fsfreeze and the error message happen immediately after each other: $ grep qemu-ga syslog.1 May 25 00:51:19 CmsrvMTA qemu-ga: info: guest-fsfreeze called This is the only entry of the qemu guest agent in syslog. The difference of this guest in compresence with other, is that this guest runs postfix + amavis + spammassasin + clamav Any help would be appreciated. More info: $ sudo virsh version Compiled agains...