Re: Bug#256871: cdrecord triggers memory leak in kernel space

[Joerg Schilling]

Hi,

I would not believe that there is a big memory leak in Linux.


However, you seem to missunderstand me:

The problem is not that Linux incorrectly believes that there is no memory.
The problem is that Linux _before_ believes that there is _plenty_ of memory
although there is none left over.

Try this:

char    buf[16*1024*1024];
main()
{
        int     i;
        int     ret;

        for (i = 0; i < 1000; i++) {
                if (ret == 0)
                        sleep(1000);
                if (ret < 0) {
                        perror("fork");
                        printf("i: %d\n", i);
                        exit(1);
                }
        }
}

On Solaris, you will see something like:

fork: Not enough space
i: 53

On Linux, I asume that you will see no error message.....

If you modify the loop to:

        for (i = 0; i < 1000; i++) {
                if (ret == 0) {
                        sleep(10);
                        memset(buf, 0, sizeof(buf));
                        sleep(1000);
                }

...

You will see the same problems as you did describe.


J?rg

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-------------------------------------------------------------------------------
Information forwarded to debian-bugs-dist@xxxxxxxxxxxxxxxx, Joerg Jaspert
<joerg@xxxxxxxxxx>:
Bug#256871; Package cdrecord. Full text available.
-------------------------------------------------------------------------------
Acknowledgement sent to Jeff King <peff-debbug@xxxxxxxx>:
Extra info received and forwarded to list. Copy sent to Joerg Jaspert
<joerg@xxxxxxxxxx>. Full text available.
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Received: (at 256871) by bugs.debian.org; 6 Jul 2004 21:02:11 +0000