linux-kernel - Re: [patch 7/7] stacktrace filtering for fault-injection capabilities

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Message-Id: <20061013120321.148ee494.akpm@osdl.org>
Date:	Fri, 13 Oct 2006 12:03:21 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linux-kernel@...r.kernel.org, ak@...e.de,
	Don Mullis <dwm@...r.net>, Valdis.Kletnieks@...edu
Subject: Re: [patch 7/7] stacktrace filtering for fault-injection
 capabilities

On Sat, 14 Oct 2006 03:00:39 +0900
Akinobu Mita <akinobu.mita@...il.com> wrote:

> On Thu, Oct 12, 2006 at 02:20:04PM -0700, Andrew Morton wrote:
> 
> > I read the documentation but I still don't understand this feature.  What
> > does the stacktrace actually do?  It gets stored somewhere and displayed
> > later?  What's it all for?
> 
> For example someone may want to inject kmalloc()/kmem_cache_alloc()
> failures into only e100 module. they want to inject not only direct
> kmalloc() call, but also indirect allocation, too.
> 
> - e100_poll --> netif_receive_skb --> packet_rcv_spkt --> skb_clone
>   --> kmem_cache_alloc
> 
> This patch enables to detect function calls like this by stacktrace
> and inject failures. The script
> Documentaion/fault-injection/failmodule.sh
> helps it.
> 
> The range of text section of loaded e100 is expected to be
> [/sys/module/e100/sections/.text, /sys/module/e100/sections/.exit.text)
> 
> So failmodule.sh stores these values into /debug/failslab/address-start
> and /debug/failslab/address-end.

Oh I see.  So you walk up the stack and if any caller falls between those
two addresses, we enable the fault-injector.   Fair enough.

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