PARI/GP Bug report logs - #2226
bug (Segmentation fault), pari says "please report"

Package: gp2c; Maintainer for gp2c is Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>; Source for gp2c is src:gp2c.

Reported by: "Perez Bustamante, Adrian" <adrian.pb@gatech.edu>

Date: Sat, 2 May 2020 01:33:02 UTC

Severity: normal

Merged with 2227

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From: "Perez Bustamante, Adrian" <adrian.pb@gatech.edu>
To: "submit@pari.math.u-bordeaux.fr" <submit@pari.math.u-bordeaux.fr>
Thread-Topic: bug (Segmentation fault), pari says "please report"
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[Message part 1 (text/plain, inline)]
Package: Pari/gp2c
Version: 2.9.4

Hello,

I implemented a recursive version of FFT. When I compile it using gp2c and try to use it in the pari calculator a bug appears and says please report. However, when I run the code inside the pari calculator, it works flawlessly. Please see the transcript below. Also, I am attaching my script for the FFT. I am using Ubuntu.  18.04

Best,
Adrian.
---------------------------transcript--------------------------------------------


gp2c-run -g -s_c fft.gp
Reading GPRC: /etc/gprc ...Done.

                  GP/PARI CALCULATOR Version 2.9.4 (released)
          amd64 running linux (x86-64/GMP-6.1.2 kernel) 64-bit version
        compiled: Dec 19 2017, gcc version 7.3.0 (Ubuntu 7.3.0-1ubuntu1)
                           threading engine: pthread
                 (readline v7.0 enabled, extended help enabled)

                     Copyright (C) 2000-2017 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 ?15 for how to get moral (and possibly technical) support.

parisize = 8000000, primelimit = 500000, nbthreads = 8
? \r fft.gp
? ?FFT
FFT =
  (v)->if(#v<=1,v,my(t=-2*Pi*I,x,y,z);x=vector(#v/2,i,i=2*i-1;v[i]);y=vector(#v/2,i,i=2*i;v[i]);x=FFT(x);y=FFT(y);z=vector(#v);for(k=1,(#v)/2,y[k]=exp((t*(k-1))/(#v))*y[k];z[k]=x[k]+y[k];z[k+(#v)/2]=x[k]-y[k]);z;)

? ?FFT_c
FFT_c: installed function
library name: FFT
prototype: D0,G,p

? n=2^10; v=vector(n,i,sin(Pi*(i-1)/n));
? #
   timer = 1 (on)
? u=FFT(v);
time = 30 ms.
? w=FFT_c(v);
  ***   at top-level: w=FFT_c(v)
  ***                   ^--------
  *** FFT_c: bug in PARI/GP (Segmentation Fault), please report.
  ***   Break loop: type 'break' to go back to GP prompt
break>


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[fft.gp (application/x-gnuplot, attachment)]

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Bill Allombert <allomber@math.u-bordeaux.fr>. Last modified: Sat Aug 26 16:37:05 2023; Machine Name: pari

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