On second though let's hold off on the core dump, I realize with how many lines you're sorting the dump must be excessively large. Let's hope we can nail it with a proper stack trace first.

On Fri, May 3, 2013 at 1:09 AM, Chen Guo <chen.guo.0625@gmail.com> wrote:

Hi Kevin,if it's not too much trouble a core dump would also be nice to have, particularly given how difficult this seems to be to reproduce.

On Wed, May 1, 2013 at 1:21 PM, Paul Eggert <eggert@cs.ucla.edu> wrote:
Can you build coreutils without optimization
(make CFLAGS='-g3') and get a backtrace from
that version? That might be easier to diagnose.