round4 bug

[Igor Schein <igor@txc.com>]

Hi,

? nfdisc(x^8-18523911338877795571979541015892615821899371353007053617321226050166675063444487117209600000002*x^6+66046032206948280681505445107777407158857150778666621415782489010349723670806137312162405167710337882006595358980644793230404795173825438833351539869976139417951596742423912542341086717592928772515031154397064403303886209889075200000016*x^4-611715422443088666756911217616327714005525597151441388699040484267060775757052196963817130148238195987896644874882570815334090128515884018736389189598104883097830045803551177719524888951453810182790127699384164247291566458717718841875962598408993568359068747730396358706617053542591613414581062482029464867475302414234419200000000*x^2+1090519592570312394824742937139044995002346676910200234065413483369651285433328371966513980373672720867274391022554420298936550273060002685473689170154581627128631733496643010662055728590929714586890390760249491371247258364903201681264280750249866551730999657777761480702970381696097426333212384757160277240403200637394323973803072310856025374382648070080573188733759065218101926564609509283848815844890208490116444737131659677353548170380498496976490332160000000000000000,1);
  ***   bug in GP (Segmentation Fault), please report

This bug goes back to version 2.2.4.  Increasing primelimit from default 5e5 hides it.

Thanks

Igor