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?
>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='009c01cc108b$4635c7d0$d2a15770$@com' \
--to=chenxi05@baidu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=maxin.john@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.