
Running agetty on ttyS0 interferes with the backdoor, which uses ttyS0 as its standard error. After agetty starts, writes to the stderr file descriptor will return EIO (though doing "exec 2>/proc/self/fd/2" will miracuously fix this). http://hydra.nixos.org/build/3252782
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.
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