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The tokio::fs module should only be used for ordinary files. Trying to use it with e.g., a named pipe on Linux can result in surprising behavior, such as hangs during runtime shutdown.
https://docs.rs/tokio/1.41.1/tokio/fs/index.html
shim often hang at eventfd_file.read
ps -auxf
refer https://github.com/containers/conmon-rs/blob/ad7ada97446ac82200d98280228cab76386fa699/conmon-rs/server/src/oom_watcher.rs#L132
@mxpv