I wrote:
>       close(2);
>       d = dup(p[0]);
>       Assert(d == 2);

Having re-read the pipe(2) man page, of course that should be
        d = dup(p[1]);
since it's the writing end of the pipe you want to plug stderr into.

BTW, if it wasn't clear: I'd do the same pushup for stdout too,
just in case.  I'm not sure there is any output to stdout left in the
backend, but I wouldn't swear there is not, either.

                        regards, tom lane

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