Hello Timothy,

Ludovic Courtès <ludo@gnu.org> skribis:

> The hack below addresses that (mostly) by reserving low-number file
> descriptors before the signal and finalization threads create their
> pipe.  (In practice, we can only reserve FDs above 5; FDs 3 and 4 are
> the “sleep pipe” I believe.)

I’ve just sent cleaned-up patches to gash-devel including this
fix/workaround.

It passes my tests, meaning that I cannot reproduce the original bug in
a timely fashion when running:

  ./pre-inst-env gash -c 'exec 2>/dev/null; while true; do echo $(sh --version) > /dev/null; done'

or when running part of the GCC 4.9.4 ‘configure’ script in a loop
(attached is the helper script I used for that; not shown here is a
manual modification of said script so that it exits after “checking for
a sed that does not truncate output”, which was sufficient to reproduce
the bug, possibly after many iterations).

It would be great to cut a Gash release soonish as this bug has been
blocking the ‘core-packages-team’ branch for a while already.

Thanks,
Ludo’.