I found a bug about the thread stack size overflow.

Here are procedures to reproduce this bug:

------------------------------------------
[root@localhost Temp]# cat test.c
#include <pthread.h>
#include <stdio.h>

int main(void)
{
	size_t stacksize;
	pthread_attr_t attr;

	pthread_attr_init(&attr);

	pthread_attr_getstacksize(&attr, &stacksize);

	printf("%lu\n", (unsigned long)stacksize);

	return 0;
}
----------------------------------------------------

[root@localhost Temp]# gcc -o test test.c -lpthread
[root@localhost Temp]# ulimit -s 1024
[root@localhost Temp]# ulimit -s
1024
[root@localhost Temp]# ./test
1048576
[root@localhost Temp]# ulimit -s $(( 0xffffffff / 1024 ))
[root@localhost Temp]# ulimit -s
4194303
[root@localhost Temp]# ./test
0

------- Additional Comment #1 From wang fang 2007-12-12 09:55 -------

Created an attachment (id=2133)
patch to fix the bug

------- Additional Comment #2 From Ulrich Drepper 2007-12-12 17:51 -------

This is a user bug.  I'm not going to add code to prevent the user from shooting
herself/himself in the foot.  Maybe sometimes it's useful.  There is a clearly
documented minimum stack size.  If it is not followed bad things can happen. 
So, don't do it.