linux-kernel - Re: [Demo/lkm] Kcoredump -- Do coredump in any where of kernel(not same with kcore)

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Message-ID: <daef60380909220718h29d0a560rfe3430e4955c59d8@mail.gmail.com>
Date:	Tue, 22 Sep 2009 22:18:19 +0800
From:	Hui Zhu <teawater@...il.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Demo/lkm] Kcoredump -- Do coredump in any where of kernel(not 
	same with kcore)

On Tue, Sep 22, 2009 at 17:31, Américo Wang <xiyou.wangcong@...il.com> wrote:
> On Tue, Sep 22, 2009 at 4:41 PM, Hui Zhu <teawater@...il.com> wrote:
>> Hi guys,
>>
>> Kcoredump do a coredump in most part of kernel (it use kprobe, it can
>> be set most of part of kernel).  For example:
>> insmod kcoredump.ko name=do_fork offset=11
>> gdb ./vmlinux /proc/kcoredump
>> Core was generated by `'.
>
> But what is your point of generating coredump anywhere?
> I mean what do you really want by this?

We can get the kernel status in do_fork+11 and put it to core file (It
like gdb command "gcore").  GDB can parse it.

>
> I think we can do this by systemtap+kdump, can't we?
>
It seems that kdump just can get core when kernel crash.

Thanks,
Hui
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