linux-kernel - Re: 答复: problem with kmemleak

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Date:	Thu, 12 May 2011 14:16:32 +0300
From:	Daniel Baluta <daniel.baluta@...il.com>
To:	chenxi <chenxi05@...du.com>
Cc:	Maxin B John <maxin.john@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: 答复: problem with kmemleak

On Thu, May 12, 2011 at 12:59 PM, chenxi <chenxi05@...du.com> wrote:
> Thx, Maxin :)
> ok
> I did steps below:
> 1 make oldconfig
> 2 vim .config
>  ...
>  CONFIG_DEBUG_FS = y
>  CONFIG_DEBUG_KMEMLEAK = y
>  CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE = 1200
>  ...
> 3 make ; make modules ; and replace the kernel; reboot
> 4 mount -t debugfs debugfs /sys/kernel/debug
> 4 I wrote a module like this
>  #include <linux/init.h>
>  #include <linux/module.h>
>  #include <linux/kernel.h>
>  #include <linux/vmalloc.h>
>
> void myfunc(void)
> {
>        char *ptr;
>        ptr = vmalloc(512);
>        ptr = vmalloc(512);
>        ptr = vmalloc(512);
> }
>
> int hello_init(void)
> {
>        printk(KERN_ALERT "Hello World");
>        myfunc();
>        return 0;
> }
>
> static void hello_exit(void)
> {
>        printk(KERN_ALERT "Goodbye World");
> }
>
> module_init(hello_init);
> module_exit(hello_exit);
>
> MODULE_LICENSE("GPL v2");
>
> 5 clear the kmemleak
>  Echo clear > /sys/kernel/debug/kmemleak
> 6 insmod the module
>  Insmod xxx.ko

Can you please remove your module?
I think the memory is leaked at unload time.

thanks,
Daniel
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