PARI/GP Bug report logs - #1374
isprime fails with Bus Error

Package: pari; Maintainer for pari is Aurel Page <aurel.page@normalesup.org>; Source for pari is src:pari.

Reported by: Charles Greathouse <charles.greathouse@case.edu>

Date: Tue, 13 Nov 2012 23:33:03 UTC

Severity: normal

Done: Karim Belabas <Karim.Belabas@math.u-bordeaux1.fr>

Bug is archived. No further changes may be made.

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Report forwarded to bug-submit-list@pari.math.u-bordeaux.fr, Karim.Belabas@math.u-bordeaux.fr:
Bug#1374; Package pari. (full text, mbox, link).

Acknowledgement sent to Charles Greathouse <charles.greathouse@case.edu>:
New Bug report received and forwarded. Copy sent to Karim.Belabas@math.u-bordeaux.fr. (full text, mbox, link).

Message #5 received at submit@pari.math.u-bordeaux.fr (full text, mbox, reply):

[Message part 1 (text/plain, inline)]

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

[Message part 2 (text/html, inline)]

Reply sent to Karim Belabas <Karim.Belabas@math.u-bordeaux1.fr>:
You have taken responsibility. (full text, mbox, link).

Notification sent to Charles Greathouse <charles.greathouse@case.edu>:
Bug acknowledged by developer. (full text, mbox, link).

Message #10 received at 1374-close@pari.math.u-bordeaux.fr (full text, mbox, reply):

* 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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Bill Allombert <allomber@math.u-bordeaux.fr>. Last modified: Tue Apr 29 12:10:58 2025; Machine Name: pari

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PARI/GP Bug report logs - #1374 isprime fails with Bus Error

PARI/GP Bug report logs - #1374
isprime fails with Bus Error