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rename()behavior you're referring to where it will atomically replace has been around since at least SVR4 and early editions of the original BSD, so it's pretty solidly present in historical systems too. The behavior itself has long since been codified in POSIX (I'm pretty sure it was in the original spec) and the Single Unix Specification as a mandatory part of the VFS API.mount --make-rprivate /inside theunshare -mshell, that will stop the bind mounts from disappearing? I can't reproduce this.