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When attempting to use parallel mode along with sudo, fabric was causing paramiko-ng to go into an infinite loop. The reason was due to a combination of fabric calling sendall() along with it misdetecting EOF on the input and closing the output channel. The fix for paramiko-ng going into an infinite loop is here:
ploxiln/paramiko-ng#140
This commit fixes the root cause in fabric where it (apparently) erroneously detects the input channel as being closed when it is not.