segmentation fault - What is the maximum size of stack segment that can be allocated to a process? - 


#include<stdio.h> #include<stdlib.h>  void start(){    double xyz[135168];   char str[20];    xyz[0] = 1.2;    sprintf(str,"pmap %d",getpid());   system(str);    start(); }  int main(){    char str[20];    sprintf(str,"pmap %d",getpid());   system(str);    printf("entering start()\n");   start();        return 0; }

output

anirudh@anirudh-aspire-5920:~/desktop/testing$ ./a.out  3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bfe1c000    132k rw---    [ stack ]  total     1676k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bfd32000   1068k rw---    [ stack ]  total     2612k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bfc2a000   2124k rw---    [ stack ]  total     3668k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bfb22000   3180k rw---    [ stack ]  total     4724k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bfa1a000   4236k rw---    [ stack ]  total     5780k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bf911000   5296k rw---    [ stack ]  total     6840k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bf809000   6352k rw---    [ stack ]  total     7896k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bf701000   7408k rw---    [ stack ]  total     8952k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bf5f9000   8464k rw---    [ stack ]  total    10008k 3695:   ./a.out 00110000   1372k r-x--  /lib/libc-2.12.1.so 00267000      8k r----  /lib/libc-2.12.1.so 00269000      4k rw---  /lib/libc-2.12.1.so 0026a000     12k rw---    [ anon ] 00b64000      4k r-x--    [ anon ] 00c27000    112k r-x--  /lib/ld-2.12.1.so 00c43000      4k r----  /lib/ld-2.12.1.so 00c44000      4k rw---  /lib/ld-2.12.1.so 08048000      4k r-x--  /home/anirudh/desktop/testing/a.out 08049000      4k r----  /home/anirudh/desktop/testing/a.out 0804a000      4k rw---  /home/anirudh/desktop/testing/a.out b78eb000      4k rw---    [ anon ] b78fe000      8k rw---    [ anon ] bf4f1000   9520k rw---    [ stack ]  total    11064k segmentation fault

just before code crashed total memory allocated 9520k. everytime run different values, of them in range of 9000k - 10000k want know maximum size of stack segment can allocated process in linux.

another thing noticed 

 bfe1c000    132k rw---    [ stack ]  .  bf911000   5296k rw---    [ stack ]  .  bf4f1000   9520k rw---    [ stack ]

so each time virtual address of stack segment changes. every time new memory allocated , content old memory copy-pasted new memory location.

ulimit -s should show maximum stack size.


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