linux-kernel - Re: 2.6.32.21 - uptime related crashes?

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Message-ID: <1310724161.2586.297.camel@twins>
Date:	Fri, 15 Jul 2011 12:02:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	john stultz <johnstul@...ibm.com>
Cc:	Willy Tarreau <w@....eu>, Ingo Molnar <mingo@...e.hu>,
	"MINOURA Makoto / ?$BL'1: ?$B??" <minoura@...inux.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Faidon Liambotis <paravoid@...ian.org>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	seto.hidetoshi@...fujitsu.com,
	Hervé Commowick <hcommowick@...sec.fr>,
	Rand@...per.es
Subject: Re: 2.6.32.21 - uptime related crashes?

On Fri, 2011-07-15 at 10:30 +0200, Peter Zijlstra wrote:
> On Thu, 2011-07-14 at 17:35 -0700, john stultz wrote:
> > 
> > Peter/Ingo: Can you take a look at the above and let me know if you find
> > it too disagreeable? 
> 
> I'm not quite sure of the calling conditions of set_cyc2ns_scale(), but
> there's two sites in there that do:
> 
> +       local_irq_save(flags);
> 
> +               data = kmalloc(sizeof(*data), GFP_KERNEL);
> 
> +       local_irq_restore(flags);
> 
> Clearly that's not going to work well at all.

Furthermore there is a distinct lack of error handling there, it assumes
the allocation always succeeds.
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