linux-kernel - Re: [Bug #11569] Don't complain about disabled irqs when the system has paniced

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Message-ID: <20081006060238.GB3180@one.firstfloor.org>
Date:	Mon, 6 Oct 2008 08:02:38 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [Bug #11569] Don't complain about disabled irqs when the system has paniced

On Sat, Oct 04, 2008 at 07:32:54PM +0200, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of recent regressions.
> 
> The following bug entry is on the current list of known regressions
> from 2.6.26.  Please verify if it still should be listed and let me know
> (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11569
> Subject		: Don't complain about disabled irqs when the system has paniced
> Submitter	: Andi Kleen <andi@...stfloor.org>
> Date		: 2008-09-02 13:49 (33 days old)
> References	: http://marc.info/?l=linux-kernel&m=122036356127282&w=4

The problem is actually worse than this description suggests. I updated
the bugzilla entry now.

The new smp_call_function() that is called from panic is quite unsuitable
for this task:
- It allocates memory (not a good idea in panic0
- It complains about interrupt off
- This whole thing breaks at least machine checks

-Andi

-- 
ak@...ux.intel.com
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