As John Dyson wrote:
> Thanks -- now I have to figure out how to reproduce it. :-). I don't
> normally run XDM, so off I go to experiment.
If you've got X available at all, all i needed to do was running xrdb
(so the cpp got called). This happened from xdm itself, as well as
(after killing xdm's xrdb run off) from my ~/.xsession.
I think just writing a test case doing 1000 popen()'s gets you a good
chance of triggering the problem.
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Never trust an operating system you don't have sources for. ;-)