C segmentation fault - Array too large?

Asked Jan 17 '23 at 13:28

Active Jan 17 '23 at 13:28

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I am currently trying to write some image processing algorithms for large images in Standard C where I encountered some weird segmentation fault behaviour when trying to allocate memory for a large array. The following code already runs into a segmentation fault on my WSL instance:

int main() {
    unsigned char test[8640][15360];
    return 0;
}

Can anybody help me understand what is going on? The numbers are not arbitrary, they are the image height and width in my production code.

asked Jan 17 '23 at 13:28

ImanityDev

This code will allocate the large array on the stack. Consider using dynamic allocation, e.g. using `malloc`. – Bodo Jan 17 '23 at 13:31
You have a 130Mb large image? That doesn't sound right. – Lundin Jan 17 '23 at 13:31
@Lundin It is a bitmap of a 16k resolution image. The filesize is actually three times as much. – ImanityDev Jan 17 '23 at 13:32

C segmentation fault - Array too large?

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