I found the root cause in my environment.
I use libvirt in LXC. And the lxc doesn't enable the cgroup w/ read and
write permission. I add/change the config file with following line.
lxc.aa_profile = lxc-container-default-with-nesting
And install `cgroup-lite` in lxc guest. The libvirt works with CPU
affinity.
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https://bugs.launchpad.net/bugs/1439280
Title:
Libvirt CPU affinity error
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