[libgpiod] segfault with function gpiod_chip_get_all_lines(chip, &bulk);

[John Rose <ohimg801@xxxxxxxxx>]

SBC:    HardKernel Odroid N2 4Gb.
OS:     Ubuntu 18.04.3 Mate' DE.
        Linux odroid_N2 4.9.196-63 #1 SMP PREEMPT Thu Oct 17 00:44:03
-03 2019 aarch64 aarch64 aarch64 GNU/Linux
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A basic test of the gpiod_chip_get_all_lines function.
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/*--+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
 * libgpio_test_03
 *
 *
 *
 */
/*******gdb debugger
error********************************************************************************************************
t3st3r1@odroid_N2:~$ sudo gdb c_projects/libgpio_test_03/main
GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from c_projects/libgpio_test_03/main...done.
(gdb) run
Starting program: /home/t3st3r1/c_projects/libgpio_test_03/main
OdroidN2 -- Ubuntu 18.04.3 LTS
libgpio_test_03

gpiod_chip_open() OK.


Program received signal SIGSEGV, Segmentation fault.
0x0000007fb7fa48d0 in gpiod_line_bulk_add (line=0x555556a910,
bulk=0x7ffffff2a0) at ../include/gpiod.h:578
578 bulk->lines[bulk->num_lines++] = line;
(gdb)
*********************************************************************************************************************************/

#include "main.h"

#ifndef HIGH
#define HIGH 1
#endif

#ifndef LOW
#define LOW 0
#endif

//--+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
// Main function.
//
int main(int argc, char** argv) {
fprintf(stdout, "OdroidN2 -- Ubuntu 18.04.3 LTS\nlibgpio_test_03\n\n");

struct  gpiod_chip*     chip;
struct gpiod_line_bulk bulk;
struct gpiod_line      *line;
int offset;
const char *string;
// Open/access a specific gpiochip.
// GPIOX_0 ...GPIOX_19
//
chip = gpiod_chip_open("/dev/gpiochip1");
if (!chip) {
perror("gpiod_chip_open()");
return -1;
}
else
fprintf(stdout, "gpiod_chip_open() OK.\n\n");
// Bulk get of all gpiochip1 lines.
//********************************
// ***** Generates a segfault ****
//********************************
//
if (gpiod_chip_get_all_lines(chip, &bulk) != 0) {
perror("gpiod_chip_get_all_lines()");
return -1;
}

gpiod_chip_close(chip);
fprintf(stdout, "Exiting.\n");
return EXIT_SUCCESS;
}