bus or segmentation fault calling integrate

Nasser
917 ●11 ●36 ●60

Why does sagemath crash on this integrate? Running this inside Linux Manjaro in a VBox.

>sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.9, Release Date: 2019-09-29                     │
│ Using Python 2.7.16. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
sage: var('a b c d e f m n p x ')
(a, b, c, d, e, f, m, n, p, x)
sage: integrate((c*cos(b*x+a)^m)^(3/2),x)

And after about 20-30 seconds sagemath crashes

;;;
;;; Detected access to protected memory, also kwown as 'bus or segmentation fault'.
;;; Jumping to the outermost toplevel prompt
;;;


;;;
;;; Detected access to protected memory, also kwown as 'bus or segmentation fault'.
;;; Jumping to the outermost toplevel prompt
;;;

Strange thing is it crashes when exponent is 3/2 but not when exponent is 5/2

I remember seeing such crashes in sagemath before, but I thought this was fixed.

Is this a known bug or something new?

Thanks --Nasser

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thanks for finding this ticket. But are you sure this is the same bug and not new one? I tried the bug shown in the ticket. And that one do not core dump any more in sagemath 8.9

>sage
│ SageMath version 8.9, Release Date: 2019-09-29                     │
│ Using Python 2.7.16. Type "help()" for help.                       │
sage:  var('x m a b')
(x, m, a, b)
sage: integrate(x^m/sqrt(a + b*x^(2 - m)), x)
integrate(x^m/sqrt(b*x^(-m + 2) + a), x)
sage:

Also tried integrate((c*cos(b*x + a)^m)^(5/2),x) shown in the ticket. It also did not crash. Notice that the ticket is 1.5 years old. So I expected that the bug there was fixed? I do not know. But if you sure this post is duplicate of the ticket you linked to, that is all fine with ...(more)

Nasser ( 5 years ago )

The error message shown here indicates it's maxima that blows up, and indeed, if you include the right initialization code in maxima, it crashes on this example. So it's a bug in maxima, as the other bugs are, The place to report them to get them worked on is maxima. The ticket referenced above is a dumping ground of (probably) maxima-related integration faults anyway. There's nog guarantee the examples there ae actually listed. So if you want to keep track of this example on trac too, then that ticket is a good one to put the example. The only way for that ticket to make progress is if someone takes the effort of reporting the cases listed there to maxima, in a way that the behaviour shows in maxima directly.

nbruin ( 5 years ago )

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