BTW, I just managed to reproduce the hang, after a whole afternoon of
trying ... only it was with a non-debug build. Sigh. Anyway, it seems
my HP machine has a significantly higher probability of showing the
problem than my Linux machine --- I have been unable to see the problem
in thirty or forty "make checks" on that one.
Let me know if there's any test I could run to confirm your theory,
assuming I can make it happen again after I finish rebuilding.
regards, tom lane