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You can't expect a restarted application to work right if you've changed what pty it's talking to, any more than if you'd renamed a file it had open. Part of the state you are checkpointing includes what the application thought was going on with all its descriptors and what they referred to. If you change what pty the application's descriptor refers to, it may think it knows what the file name of the pty is and now be wrong. You just can't win that way.
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