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由 Peter Krempa 提交于
The "random" backend for virtio-rng can be started with no path specified which equals to /dev/random. The cgroup code didn't consider this and called few of the functions with NULL resulting into: $ virsh start rng-vm error: Failed to start domain rng-vm error: Path '(null)' is not accessible: Bad address Problem introduced by commit c6320d34
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