ksh tries to set the process group of a pipe to that of the first
process
but if it finishes too soon then it's not a valid process group id for
later processes.
And posix_spawn() will fail harder than just retrying setpgrp() with
the parent pgid.
$ alias | fgrep foo
is how I usually trigger this.
Only workaround is to disable use of posix_spawn.
Anything better beside turning it back on when non-interactive?
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