PROC崩溃，即使它比分配受到ulimit更少的内存 [英] Proc crashes even if it allocates less memory than limited by ulimit

问题描述

我已经设置堆栈大小为2000KB通过的ulimit -s 2000年的ulimit -Ss 2000硬性限制。而在下面的节目，我已经拨出appox 2040000（510000×4），这是比我少的限制即字节,. 2048000（2000 * 4）字节，但是我看到我的程序崩溃！任何人都可以说明为什么发生这种情况。

I have set stack size to 2000Kb by ulimit -s 2000 and ulimit -Ss 2000 for hard limit. And in the below program i have allocated appox 2040000(510000 x 4) bytes which is less than i limited i.e,. 2048000(2000*4)bytes but i see that my program crashes! Can anybody suggest why this happens.

#include <stdio.h>
#include <malloc.h>
int main()
{
    int a[510000] = {0};
    a[510000] = 1;
    printf("%d", a[510000]);
    fflush(stdout);
    sleep(70);
}

编辑1：崩溃不是因为数组索引越界，因为我试图降低指数仍然崩溃。这仅当我被限制的ulimit发生。

EDIT 1: Crash is not because of the array index out of bound as i tried lower index and still crashes. This happens only when i limit by ulimit.

推荐答案

int类型的[510000] 就会从索引数组 0 到 509999 。 A [510000] 是数组范围之外。

int a[510000] will be an array with index from 0 to 509999. a[510000] is outside the array range.

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