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
 failed!
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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