This is a me-too report.
I have just upgraded from 1.0.3-1 to 1.1.1-1 of libvirt-bin and when
I tried to start a VM from virt-manager I got the following error:
Error starting domain: internal error: Missing '/' separator in cgroup mount ''
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 96, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 117, in tmpcb
callback(*args, **kwargs)
File "/usr/share/virt-manager/virtManager/domain.py", line 1160, in startup
self._backend.create()
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 698, in create
if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error: Missing '/' separator in cgroup mount ''
Executing "umount -l /sys/fs/cgroup" as suggested makes the problem go away.
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