Message 68199 - Python tracker

This is messy.  File descriptors from other threads are leaking into
child processes, and if the write end of a pipe never gets closed in all
of them the read end won't get EOF.

I suspect "cat"'s stdin is getting duplicated like that, but I haven't
been able to verify - /proc/<pid>/fd claims fd 0 is /dev/pts/2.  Maybe
libc does some remapping.