From: Prarit Bhargava <prarit-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>,
kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
jbaron-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org,
Fabian Frederick <fabf-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org>,
isimatu.yasuaki-+CUm20s59erQFUHtdCDX3A@public.gmane.org,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Masami Hiramatsu
<masami.hiramatsu.pt-FCd8Q96Dh0JBDgjK7y7TUQ@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [PATCH] kernel, add panic_on_warn
Date: Mon, 03 Nov 2014 08:32:42 -0500 [thread overview]
Message-ID: <545783FA.4050508@redhat.com> (raw)
In-Reply-To: <20141031015843.GW9743-2aXy8kx9jd5qWu+OMeiFJmRHvnxUvMa2@public.gmane.org>
On 10/30/2014 09:58 PM, Hedi Berriche wrote:
> On Thu, Oct 30, 2014 at 17:06 Prarit Bhargava wrote:
> | There have been several times where I have had to rebuild a kernel to
> | cause a panic when hitting a WARN() in the code in order to get a crash
> | dump from a system. Sometimes this is easy to do, other times (such as
> | in the case of a remote admin) it is not trivial to send new images to the
> | user.
> |
> | A much easier method would be a switch to change the WARN() over to a
> | panic. This makes debugging easier in that I can now test the actual
> | image the WARN() was seen on and I do not have to engage in remote
> | debugging.
>
> Do we want to leave it to usersspace[1] to ensure panic_on_warn is out
> of the way in when the kdump kernel boots? or would a self-contained
> approach be more preferable i.e. test whether we're a kdump kernel
> before bothering with panic_on_warn?
Hmm ... this is a good point. Vivek, do you have a preference? I'm willing to
code it either way. I should be able to put in a is_kdump_kernel() check
without any problems but I'm not sure if that is the right thing to do here.
P.
>
> Cheers,
> Hedi.
>
> [1] kexec-tools in the case of the boot param by filtering it out of the
> kdump kernel cmdline. In the case of sysctl.conf, it would depend on
> whether there are distros out there that include it in the kdump
> initrd.
>
next prev parent reply other threads:[~2014-11-03 13:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-30 17:03 [PATCH] kernel, add panic_on_warn Prarit Bhargava
[not found] ` <1414688627-5298-1-git-send-email-prarit-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-10-30 17:24 ` H. Peter Anvin
2014-10-31 1:58 ` Hedi Berriche
[not found] ` <20141031015843.GW9743-2aXy8kx9jd5qWu+OMeiFJmRHvnxUvMa2@public.gmane.org>
2014-11-03 13:32 ` Prarit Bhargava [this message]
[not found] ` <545783FA.4050508-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-11-03 15:18 ` Vivek Goyal
-- strict thread matches above, loose matches on Subject: below --
2014-11-04 15:41 Prarit Bhargava
2014-11-05 4:27 ` WANG Chao
2014-11-05 4:55 ` Yasuaki Ishimatsu
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=545783FA.4050508@redhat.com \
--to=prarit-h+wxahxf7alqt0dzr+alfa@public.gmane.org \
--cc=ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org \
--cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
--cc=corbet-T1hC0tSOHrs@public.gmane.org \
--cc=fabf-AgBVmzD5pcezQB+pC5nmwQ@public.gmane.org \
--cc=hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org \
--cc=isimatu.yasuaki-+CUm20s59erQFUHtdCDX3A@public.gmane.org \
--cc=jbaron-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org \
--cc=kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
--cc=linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=masami.hiramatsu.pt-FCd8Q96Dh0JBDgjK7y7TUQ@public.gmane.org \
--cc=rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org \
--cc=vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).