linux-kernel - Re: regression: crash from 'ls /sys/modules/wl1251

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Date:	Wed, 30 Dec 2009 19:20:26 +0200
From:	Kalle Valo <kalle.valo@....fi>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-omap@...r.kernel.org, Helge Deller <deller@....de>,
	rusty@...tcorp.com.au, akpm@...ux-foundation.org,
	roland@...hat.com, dave@...uly1.hia.nrc.ca,
	Parisc List <linux-parisc@...r.kernel.org>
Subject: Re: regression: crash from 'ls /sys/modules/wl1251_spi/notes'

James Bottomley <James.Bottomley@...senPartnership.com> writes:

> On Wed, 2009-12-30 at 13:41 +0200, Kalle Valo wrote:
>
>> Also removing wl1251_spi causes a crash. The reason for this is that a
>> sysfs file with a null string as name is trying to be removed from the
>> notes directory.
>
> Yes, this is because the notes sections describe the text sections.
> When we ignore an empty text section, we'd need to ignore its
> corresponding notes section.
>
> The reason we didn't see this on parisc is because our compiler doesn't
> actually produce any notes sections.

Also on omap not all modules can reproduce the problem. For example
cfg80211, mac80211 and wl1251 modules work just fine, but with
wl1251_spi I see the problem everytime.

> A better, and more comprehensive patch would be to try not to count the
> empty text sections when we're building the notes section (and actually
> anywhere else in the file).  This patch actually relies on the fact that
> if sh_size is zero for the text section it should be for the
> corresponding notes section.  If that doesn't work, we'd actually have
> to do the matching in the construction piece.
>
> Can you try it to see if it works for you?  If it doesn't, I'll try
> matching notes to text.  It works fine on parisc, but as we don't have a
> notes section, that's not saying much ...

Thanks. I tested the patch on my setup, this time on top of Linus'
tree (commit 6b7b284). And the patch fixes the issue, I can't
reproduce the problem at all, both 'rmmod wl1251_spi' and ls work
without any problems. So here's my tested-by:

Tested-by: Kalle Valo <kalle.valo@....fi>

Also please consider sending the fix to stable.

Thank you for fixing this so fast.

-- 
Kalle Valo
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