Version: 2.7.1 release

./gp
                                                                    GP/PARI CALCULATOR Version 2.7.1 (released)
                                                           amd64 running linux (x86-64/GMP-5.0.4 kernel) 64-bit version
                                                        compiled: Aug 21 2014, gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
                                                                             threading engine: single
                                                                 (readline not compiled in, extended help enabled)

                                                                      Copyright (C) 2000-2014 The PARI Group

PARI/GP is free software, covered by the GNU General Public License, and comes WITHOUT ANY WARRANTY WHATSOEVER.

Type ? for help, \q to quit.
Type ?12 for how to get moral (and possibly technical) support.

parisize = 8000000, primelimit = 500000
? isprime( 2030967737887612953751815611955778057721609672149695775998900201419048774375002716065557720510887824952942799737911826638068045234238082640629966597954851668852106621828704531597859470496362810381251800973022824003330423370127762722630493369197869948901862977534730314352222720177713223750671181797 )
  ***   at top-level: isprime(203096773788
  ***                 ^--------------------
  *** isprime: bug in PARI/GP (Segmentation Fault), please report.
  ***   Break loop: type 'break' to go back to GP prompt
=======================================================================

This was on Ubuntu 14.04 LTS

=======================================================================
uname -a
Linux Hexacore 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
=======================================================================

On pari 2.5.3 it returns correctly.

Thanks,

Jonathan