PARI/GP Bug report logs -
#1374
isprime fails with Bus Error
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From: Charles Greathouse <charles.greathouse@case.edu>
Date: Tue, 13 Nov 2012 18:21:37 -0500
Message-ID: <CAAkfSGKZUc-Ppm5=MkRXLFNgKwYnMum05ukKrcn6XOnp9CMO5w@mail.gmail.com>
Subject: isprime fails with Bus Error
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Package: pari
Version: 2.6.0 git-460e83a
> N = 4309513411435775833571;
> ispseudoprime(N)
%1 = 1
> isprime(N)
*** at top-level: isprime(N)
*** ^----------
*** isprime: bug in PARI/GP (Bus Error), please report.
*** Break loop: type 'break' to go back to GP prompt
Charles Greathouse
Analyst/Programmer
Case Western Reserve University
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Package: pari<br>Version: 2.6.0 git-460e83a<br><br>> N =3D 4309513411435=
775833571;<br>> ispseudoprime(N)<br>%1 =3D 1<br>> isprime(N)<br>=A0 *=
**=A0=A0 at top-level: isprime(N)<br>=A0 ***=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0 ^----------<br>=A0 *** isprime: bug in PARI/GP (Bus Erro=
r), please report.<br>
=A0 ***=A0=A0 Break loop: type 'break' to go back to GP prompt<br><=
br clear=3D"all">Charles Greathouse<br>Analyst/Programmer<br>Case Western R=
eserve University<br>
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Date: Wed, 14 Nov 2012 02:07:16 +0100
From: Karim Belabas <Karim.Belabas@math.u-bordeaux1.fr>
To: Charles Greathouse <charles.greathouse@case.edu>,
1374-close@pari.math.u-bordeaux.fr
Subject: Re: Bug#1374: isprime fails with Bus Error
Message-ID: <20121114010716.GA19135@math.u-bordeaux1.fr>
References: <CAAkfSGKZUc-Ppm5=MkRXLFNgKwYnMum05ukKrcn6XOnp9CMO5w@mail.gmail.com>
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* Charles Greathouse [2012-11-14 00:41]:
> > N = 4309513411435775833571;
> > ispseudoprime(N)
> %1 = 1
> > isprime(N)
> *** at top-level: isprime(N)
> *** ^----------
> *** isprime: bug in PARI/GP (Bus Error), please report.
> *** Break loop: type 'break' to go back to GP prompt
Obscure bug introduced in 28e1f18b. Fixed in master:
commit b6eefc625299e25f7d4feb1f95e43cf8bc1a4e9f
Author: Karim Belabas <Karim.Belabas@math.u-bordeaux1.fr>
Date: Wed Nov 14 02:04:12 2012 +0100
pass around pC length instead of abusing lg() [#1374]
introduced in 28e1f18b: isprime(4309513411435775833571) -> SEGV
Thanks for your report !
K.B.
--
Karim Belabas, IMB (UMR 5251) Tel: (+33) (0)5 40 00 26 17
Universite Bordeaux 1 Fax: (+33) (0)5 40 00 69 50
351, cours de la Liberation http://www.math.u-bordeaux1.fr/~belabas/
F-33405 Talence (France) http://pari.math.u-bordeaux1.fr/ [PARI/GP]
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