netdev - Re: sha512: make it work, undo percpu message schedule

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Message-ID: <20120112235514.GA5065@p183.telecom.by>
Date:	Fri, 13 Jan 2012 02:55:14 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-crypto@...r.kernel.org, netdev@...r.kernel.org,
	ken@...elabs.ch
Subject: Re: sha512: make it work, undo percpu message schedule

On Wed, Jan 11, 2012 at 11:36:11AM +1100, Herbert Xu wrote:
> On Wed, Jan 11, 2012 at 03:00:40AM +0300, Alexey Dobriyan wrote:
> > commit f9e2bca6c22d75a289a349f869701214d63b5060
> > aka "crypto: sha512 - Move message schedule W[80] to static percpu area"
> > created global message schedule area.
> > 
> > If sha512_update will ever be entered twice, hilarity ensures.
> 
> Hmm, do you know why this happens? On the face of it this shouldn't
> be possible as preemption is disabled.

Herbert, I couldn't come up with a single scenario. :-(
But the bug is easy to reproduce.
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