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qemu-kvm problem - libvirtd won't start

I've been running a couple of virtual machines on a Wheezy/AMD64 server for a few years now. After the last reboot, I couldn't connect to them anymore. I can't get libvirtd to start on the server:

[....] Starting libvirt management daemon: libvirtd/usr/sbin/libvirtd: error: unable to determine if daemon is running: No such file or directory

The message looks a bit strange with the libvirtd at the top of the path. Checking the libvirt/libvirtd.log I see:

2014-11-16 20:19:11.010+0000: 5658: error : qemuMonitorIO:660 : internal error: End of file from monitor 2014-11-16 20:19:11.014+0000: 5658: error : virSecurityDACRestoreSecurityFileLabel:310 : cannot resolve symlink /dev/bus/usb/002/002: No such file or directory 2014-11-16 20:19:14.145+0000: 5658: error : virNetSocketReadWire:1453 : End of file while reading data: Input/output error

I can't see anything much in syslog - nothing about libvirt(d) and only this about kvm:

Nov 16 17:07:55 TheLibrarian kernel: [ 4.077661] kvm: Nested Virtualization enabled Nov 16 17:07:55 TheLibrarian kernel: [ 4.077665] kvm: Nested Paging enabled

It's a fairly vanilla Wheezy server setup, running NFS and CUPS but also Samba4 from the backports, and of course qemu-kvm.

Any ideas anyone?

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