bug for stack ?

[gaoqiang <gaoqiangscut@gmail.com>]

memory allocated for process stack seems never to be freed by the kernel..


on a vmware machine with about 768m memory, run the following program.when
printing "run over", run another case of the following program. oom-killer
trigered, which is not so reasonable.


#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <alloca.h>
void*stack=NULL;
const long water_mark=512*1024*1024;
void func()
{
	int p=0;
	if((long)stack-(long)&p> water_mark)
	{
		printf("hit\n");
	}
	else
	{
		func();
	}
	return;
}
int main()
{
	struct rlimit limit;
	limit.rlim_cur=1024*1024*1024*1.5;
	limit.rlim_max=1024*1024*1024*1.5;
	setrlimit(RLIMIT_STACK,&limit);
	int a=0;
	stack=&a;
	printf("run\n");
	//getchar();
	func();
	printf("run over\n");
	getchar();
	return 0;
}

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