From: chenxi <chenxi05@baidu.com>
To: "'Maxin B John'" <maxin.john@gmail.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: 答复: problem with kmemleak
Date: Thu, 12 May 2011 17:59:25 +0800 [thread overview]
Message-ID: <009c01cc108b$4635c7d0$d2a15770$@com> (raw)
In-Reply-To: <BANLkTi=S3VR1mxc0bsL4+N3ksHeo3scg3A@mail.gmail.com>
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
7 echo scan > /sys/kenel/debug/kmemleak
8 watch it
Cat / sys/kenel/debug/kmemleak
>> unreferenced object 0xffffc90012d27000 (size 64):
>>
>> comm "insmod", pid 13092, jiffies 4298369684
>>
>> hex dump (first 32 bytes):
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> backtrace:
>>
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
And I can only get the backtrace [<ffffffffffffffff>]
BTW the kernel's version is 2.6.32.
Thx to Maxin again~~~:)
-----邮件原件-----
发件人: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-owner@vger.kernel.org] 代表 Maxin B John
发送时间: 2011年5月12日 17:44
收件人: ttlxzz ccc
抄送: linux-kernel@vger.kernel.org
主题: Re: problem with kmemleak
Hi,
Could you please share some more information about your setup ?
Regards,
Maxin
On Thu, May 12, 2011 at 4:13 AM, ttlxzz ccc <boyzccc@gmail.com> wrote:
> help~~~：） please ！thx！！
>
> On Thu, May 12, 2011 at 10:06 AM, ttlxzz ccc <boyzccc@gmail.com> wrote:
>> Hi, all:
>>
>>
>>
>> I just want to use kmemleak, so I make the CONFIG_DEBUG_KMEMLEAK and
>> CONFIG_DEBUG_FS on, mount the debugfs.
>>
>> But when I insmod mm/kmemleak-test.ko, echo scan >
>> /sys/kernel/debug/kmemleak and cat /sys/kernel/debug/kmemleak. I just
>> see this:
>>
>> unreferenced object 0xffffc90012d21000 (size 64):
>>
>> comm "insmod", pid 13092, jiffies 4298369684
>>
>> hex dump (first 32 bytes):
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> backtrace:
>>
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> unreferenced object 0xffffc90012d24000 (size 64):
>>
>> comm "insmod", pid 13092, jiffies 4298369684
>>
>> hex dump (first 32 bytes):
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> backtrace:
>>
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> unreferenced object 0xffffc90012d27000 (size 64):
>>
>> comm "insmod", pid 13092, jiffies 4298369684
>>
>> hex dump (first 32 bytes):
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>
>> backtrace:
>>
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> There is no other backtrace except [<ffffffffffffffff>]
>> 0xffffffffffffffff. Then I read the mm/kmemleak.c. In
>> kmemleak_seq_show(), I find that the object->trace_len is 1.
>>
>>
>>
>> How can I get the full backtrace?
>>
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next prev parent reply other threads:[~2011-05-12 9:59 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 2:06 problem with kmemleak ttlxzz ccc
2011-05-12 3:13 ` ttlxzz ccc
2011-05-12 9:44 ` Maxin B John
2011-05-12 9:59 ` chenxi [this message]
2011-05-12 11:16 ` 答复: " Daniel Baluta
2011-05-12 12:01 ` ttlxzz ccc
2011-05-12 14:18 ` Américo Wang
2011-05-12 14:33 ` ttlxzz ccc
2011-05-12 14:49 ` Américo Wang
2011-05-12 15:00 ` Daniel Baluta
2011-05-12 15:04 ` Catalin Marinas
2011-05-12 15:09 ` ttlxzz ccc
[not found] ` <BANLkTik6c8-g8FrXZy8-V35W6-Th++5p_A@mail.gmail.com>
2011-05-13 9:32 ` ttlxzz ccc
2011-05-13 14:08 ` Catalin Marinas
2011-05-15 6:01 ` ttlxzz ccc
2011-05-16 7:18 ` ttlxzz ccc
2011-05-16 8:53 ` Catalin Marinas
2011-05-16 8:58 ` Américo Wang
2011-05-12 10:04 ` ttlxzz ccc
2011-05-12 13:52 ` ttlxzz ccc
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