linux-kernel - Re: logging on kernel panic

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Message-ID: <CAM_iQpXHXnHDnQZwYHwCWt=HxCA3K8EmJrikTNZryYfCPdeoPA@mail.gmail.com>
Date:	Wed, 13 Jun 2012 21:38:26 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Mahmood Naderan <nt_mahmood@...oo.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: logging on kernel panic

On Wed, Jun 13, 2012 at 8:18 PM, Mahmood Naderan <nt_mahmood@...oo.com> wrote:
> Hi everybody
> If a system receives kernel panic during boot, will it be logged somewhere?
> In our diskless cluster, clients boot from an image located at /nfsroot
> Normally /nfsroot/var/log/syslog should contain messages. However
> on a kernel panic, there is no log in /nfsroot/var/log/syslog/
>

The kernel log may not hit /var/log/syslog when kernel panics,
try other more reliable way to get the kernel log, there are some
new ways to store the kernel log at panic/oops, pstore filesystem
is one of them.

As Alan mentioned, netconsole may work too.
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