Comment 3 for bug 130693

Okay, this is confirmed. It appears to be stack exhaustion within libc while handling nss_files's getent call to read a 200K line from the /etc/hosts file:

              while (1)
                {
                  rc = __gethostbyname2_r (name, family, &th, tmpbuf,
                                           tmpbuflen, &h, &herrno);
                  if (rc != ERANGE || herrno != NETDB_INTERNAL)
                    break;
                  tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
                }

This extend_alloca eventually reaches way above stack memory and seg faults. This problem seems specific to nss_files, and requires a very unusual local configuration, so I'm going to unmark this a private security issue. Thanks!