Segmentation fault of unknown cause

[yugo4k]

Hello,

I modified the file toyprob.c according to the problem I'm trying to
solve; it compiled but had a segmentation fault on execution.

The following functions were modified:
evalf
evalg
evalh
evalc
evaljac
evalhc

Since segmentation faults are usually related to off bound indexes, I
checked each array and loop but got nothing out of the expected. My
problem has 7 variables, 7 equality constraints and every bound seems
to be respected (according to the toyprob example): arrays going from
0 to 6 and index of constraint going from 1 to 7.

Using gdb, all I got was:
Program received signal SIGSEGV, Segmentation fault.
0x00000000004018a8 in Evaljac ()
Current language: auto; currently asm


The last function called in toyprob.c before the segmentation fault is
evaljac, with just the first ind of value 1. A little after the
program exits the function, the segmentation fault occurs.

Can anyone give some hint as to how to fix this?

Thanks,

Yugo

[Ernesto G. Birgin]

Yugo, hi!

Are you using the C interface?

All I can say with the information you sent is that the most probable cause is some error in your user-supplied subroutines that describe the problem.

Can you please send to the list the smallest piece of code that reproduces the error?

Regards,
Ernesto.

[Yugo K]

Hi Ernesto,

Thank you so much for your answer.

My code is a bit big; so searching for ways to reduce it to the problematic part, I wound up founding a terrible mistake on my part.
I left out the *jcnnz line (in evaljac), so that a value was never attributed to it in my code. I guess it is this variable that allocates memory for the attribution of the derivative values of the equations of constraint.

I'm sorry for disturbing you guys on such a foolish mistake on my part and thank you again for your attention.

Best regards,

Yugo

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