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由 Laine Stump 提交于
If a guest image is saved in compressed format, and the restore fails in some way after the intermediate process used to uncompress the image has been started, but before qemu has been started to hook up to the uncompressor, libvirt will endlessly wait for the uncompressor to finish, but it never will because it's still waiting to have something hooked up to drain its output. The solution is to close the pipes on both sides of the uncompressor, then send a SIGTERM before calling waitpid on it (only if the restore has failed, of course).
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