linux-kernel - Re: [patch] add kdump_after

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Message-ID: <20070726153240.GA15969@in.ibm.com>
Date:	Thu, 26 Jul 2007 21:02:40 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	Takenori Nagano <t-nagano@...jp.nec.com>,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	k-miyoshi@...jp.nec.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:	Bernhard Walle <bwalle@...e.de>
Subject: Re: [patch] add kdump_after_notifier

On Thu, Jul 26, 2007 at 04:07:02PM +0200, Bernhard Walle wrote:
> * Takenori Nagano <t-nagano@...jp.nec.com> [2007-07-19 14:15]:
> > 
> > In latest kernel, we can't use panic_notifier_list if kdump is enabled.
> > panic_notifier_list is very useful function for debug, failover, etc...
> > 
> > So this patch adds a control file /proc/sys/kernel/dump_after_notifier
> > and resolves a problem users can not use both kdump and panic_notifier_list
> > at the same time.
> > 
> > kdump_after_notifier = 0
> >  -> panic()
> >     -> crash_kexec(NULL)
> > 
> > kdump_after_notifier = 1
> >  -> panic()
> >     -> atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
> >     -> crash_kexec(NULL)
> 
> What's problematic about this patch? I also would like to see that
> feature.

I would like to see the code which will get executed after panic and 
before crash_kexec(). This potentially makes crash dump feature unreliable
in the sense one can now register on panic_notifier_list and try to
do whole lot of things and might get stuck there. After the system
has crashed, one is not supposed to do a whole lot.

Thanks
Vivek
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