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This is unlikely in most situations, but 'psusan' in particular is intended to be run in a lot of weird environments where things aren't properly set up yet. I just found out that if you use a Cygwin-built psusan as the proxy process for Windows PuTTY (to get a local Cygwin xterm) then it starts up with SHELL unset, and uxpty's forked subprocess segfaults when it tries to exec a null pointer.