lkml.org 
[lkml]   [2011]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Query about kdump_msg hook into crash_kexec()
On Mon, Jan 31, 2011 at 11:33:15PM -0800, Eric W. Biederman wrote:
>Américo Wang <xiyou.wangcong@gmail.com> writes:
>
>> On Mon, Jan 31, 2011 at 05:59:39PM -0500, Vivek Goyal wrote:
>>>
>>>Anyway, if an image is loaded and we have setup to capture dump also
>>>why do we need to save kmsg with the help of an helper. I am assuming
>>>this is more of a debugging aid if we have no other way to capture the
>>>kernel log buffer. So if somebody has setup kdump to capture the
>>>vmcore, why to call another handler which tries to save part of the
>>>vmcore (kmsg) separately.
>>>
>>
>> Well, kmsg dumper is not only for panic/oops, it can also save kernel
>> messages when the system is reboot/halt.
>>
>> Yeah, it is true that vmcore contains log_buf, but I think the users
>> of ramoops/mtdoops are mainly those who don't have kdump configured
>> in their kernels, they are cheaper than kdump, but less powerful
>
>The issue is the inane call inside crash_kexec.
>
>It requires both a kexec kernel to be loaded and it requires you to be
>crashing. Given that when I audited the kmsg_dump handlers they really
>weren't safe in a crash dump scenario we should just remove it.
>

Probably, I think we need to get rid of KMSG_DUMP_KEXEC.

--
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/

\
 
 \ /
  Last update: 2011-02-01 08:41    [W:0.051 / U:13.736 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site