linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference at 000000000000000e (reset_prng

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Message-Id: <20080715151110.d7a17c89.akpm@linux-foundation.org>
Date:	Tue, 15 Jul 2008 15:11:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	davem@...emloft.net, mingo@...e.hu, nhorman@...driver.com,
	simon@...e.lp0.eu, linux-kernel@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at
 000000000000000e (reset_prng_context)

On Wed, 16 Jul 2008 01:49:30 +0400
Alexey Dobriyan <adobriyan@...il.com> wrote:

> On Tue, Jul 15, 2008 at 01:44:07PM -0700, David Miller wrote:
> > From: Ingo Molnar <mingo@...e.hu>
> > 
> > > i have just triggered this crash too. Please, when you know about bootup 
> > > crashes in your code send a patch to the lkml thread so that people can 
> > > apply it and have a working system.
> > > 
> > > Note that the new crypto/prng.c driver has very bad quality:
> > > 
> > >   total: 45 errors, 21 warnings, 1 checks, 410 lines checked
> > > 
> > > It has tons of completely unacceptable code mistakes in it.
> > 
> > I think we should merge new drivers as aggressively as possible.
> 
> Well, I don't have strong opinion about this exact statement, but
> 
> 	Ingo, COULD YOU PLEASE PERSONALLY FUCKING STOP THIS
> 	CHECKPATCH.PL-AS-INDICATOR HORSESHIT !

Well I wouldn't put it that way but sure, there is no clear correlation.

Except that such a high density of coding-style errors is an indication
that the code was not closely and critically reviewed by an experienced
kernel developer.

> Every damn single warning in this case is about whitespace or 80 column limit.
> 
> Every damn single one!
> 
> The hacker of your calibre should know the difference between whitespace-bad code
> and bug-ridden-bad code.
> 
> 
> What are those unacceptable mistakes?
> 
> Don't read the code again, what are those mistakes?
> 

Sleeping inside spinlock?

> 
> I _very_ briefly looked at prng.c and place I find wrong it passing
> "int nbytes" to get_prng_bytes(). It should be unsigned at least.
> 
> checkpatch.pl says about this? Suuuure, it does...

If we're going to merge code which has zillions of trivially-detectable
coding-style errors and which hasn't been runtime tested with very
mainstream kernel debug options enabled and which afacit hasn't been
reviewed then we have no standards at all.
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