Segmentation fault on function call with two dimensional array

I have the following code:

#define MAXSAMPLES 1024
typedef  int sample_t;
typedef sample_t sub_band_t[MAXSAMPLES][MAXSAMPLES];

void blah(sample_t a[][MAXSAMPLES], int u0, int v0, int u1, int v1) {
. . . . 
} 


int main(int argc, char *argv[]) {
    sub_band_t in_data;
    int k =0;

    if (argc < 2) {
        printf("\nInput filename required\n");
        return 0;
    }

    FILE *input_file = fopen(argv[1], "r");
    char del = '\0';

    int i = 0, j = 0;
    int cols = 0;
    sample_t x;
    while (! feof(input_file)) {
        if (fscanf(input_file, "%d%c", &x, &del) != 2) {
            i--;
            break;
        }
        in_data[i][j] = x;
        if ( del == '\n') {
            i++;
            j =0;
            continue;
        }
        j++;
        cols = j > cols ? j : cols;
        x = 0;
    }
    blah(in_data, 0, 0, i, cols);
}

When I run this program with an input file with 10*10 integers, I get a segmentation fault at the blah function call in main. I am not able to glean any information about the segmentation fault using gdb also, it just says:

0x0000000000400928 in blah (a=Cannot access memory at address 0x7ffffdbfe198) at blah.c

What am I doing wrong here? Any help would be highly appreciated.

You typedef subband_t as a several MB large two dimensional array. That would require several MB of stack memory. Whether that works is a matter of quality of implementation. Does the program segfault for #define MAXSAMPLES 10? Then that's your problem.

And note that

 while (! feof(input_file)) { ... }

has never worked and never will because the EOF flag is only set after an input operation hit EOF. See the comp.lang.c FAQ.