linux-kernel - Re: [BUG] NULL deref in swapin

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Date:	Fri, 11 Nov 2011 13:07:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Wouter M. Koolen" <W.M.Koolen-Wijkstra@....nl>
Cc:	len.brown@...el.com, pavel@....cz, linux-kernel@...r.kernel.org
Subject: Re: [BUG] NULL deref in swapin_readahead

On Friday, November 11, 2011, Wouter M. Koolen wrote:
> Hi suspend gurus,
> 
> I got the attached NULL deref while closing and immediately reopening my 
> laptop lid. The laptop is configured to suspend to RAM.
> 
> Google yields nothing similar for "unable to handle kernel NULL pointer 
> dereference" "swapin_readahead" "radix_tree_lookup", so I guess this is 
> an as-yet unknown problem. If not, please excuse the noise.
> 
> Kernel (vanilla 3.1.0) config attached. The laptop is a MacBook4,1.
> 
> The machine goes on to print a series of soft lockup reports, but I 
> assumed they are PTSD and omited them.

Well, the trace doesn't indicate how the problem is related to the
suspend/resume code paths.

Is this a regression for you?

Thanks,
Rafael
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