linux-kernel - Re: logging on kernel panic

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Date:	Wed, 13 Jun 2012 07:52:36 -0700 (PDT)
From:	Mahmood Naderan <nt_mahmood@...oo.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"\"linux-kernel@...r.kernel.org\"" <linux-kernel@...r.kernel.org>,
	Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: logging on kernel panic

@jiri:
>and you can get the dmesg+panic from there
 Sorry where? in the bios?

@Cong:
>The kernel log may not hit /var/log/syslog when kernel panics,
Can I ask why. Just before a panic, kernel is still alive and can log. 
Isn't that?


// Naderan *Mahmood;


----- Original Message -----
From: Jiri Kosina <jkosina@...e.cz>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Mahmood Naderan <nt_mahmood@...oo.com>; "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Sent: Wednesday, June 13, 2012 6:24 PM
Subject: Re: logging on kernel panic

On Wed, 13 Jun 2012, Alan Cox wrote:

> > Hi everybody
> > If a system receives kernel panic during boot, will it be logged somewhere?
> 
> Often not.. especially if it is fatal. Look up netconsole however.

Well your machine's BIOS can still be providing non-volatile sotrage which 
under recent kernels registers itself with 'pstore', and you can get the 
dmesg+panic from there then (provided you have all the necessary bits, 
such as APEI, compiled in and enabled).

-- 
Jiri Kosina
SUSE Labs

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