linux-kernel - Re: [PATCHv3 1/1] sysfs: add more info to the oops dump

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Message-Id: <20110310152201.bb621c3f.akpm@linux-foundation.org>
Date:	Thu, 10 Mar 2011 15:22:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Phil Carmody <ext-phil.2.carmody@...ia.com>, gregkh@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 1/1] sysfs: add more info to the oops dump

On Fri, 11 Mar 2011 00:13:58 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> > > It's more of an distraction than anything which is relevant to 99.999%
> > > of the problems we have to deal with.
> > 
> > As I indicated before, I've previously thought that too, but thought I
> > could 'fix' it by adding to it when I hit the once-in-three-years case.
> 
> The interesting question is:
> 
>  How did that info help and was it really the ultimate reason why you
>  found the underlying bug ?

What happens with sysfs is that if a subsystem's handler is buggy, that
tends to cause a crash within sysfs core code.  You get a stack trace
which contains only VFS and sysfs functions - there is no symbol in the
trace which permits you to identify the offending subsystem.
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