What is the maximum size of stack segment that can be allocated to a process?
https://stackoverflow.com/questions/5039563
-
15-11-2019 - |
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#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 the code crashed the total memory allocated was 9520k.
Everytime I run it I get different values, all of them in the range of 9000k - 10000k
So I want to know what is the maximum size of stack segment that can be allocated to a process in Linux.
Another thing I noticed was
bfe1c000 132K rw--- [ stack ]
.
bf911000 5296K rw--- [ stack ]
.
bf4f1000 9520K rw--- [ stack ]
so each time the virtual address of the stack segment changes. Is it so that every time a new memory is allocated and the content from the old memory are copy-pasted to the new memory location.
Solution
ulimit -s should show you the maximum stack size.
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