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Date: Wed, 07 Dec 2005 23:05:08 +0000
From: Andy Whitcroft <andyw@uk.ibm.com>
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To: Badari Pulavarty <pbadari@us.ibm.com>
CC: haveblue@us.ibm.com, lkml <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.15-rc4 panic in __nr_to_section() with CONFIG_SPARSEMEM
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Badari Pulavarty wrote:
> Hi Andy,
> 
> I getting a panic while doing "cat /proc/<pid>/smaps" on
> a process. I debugged a little to find out that faulting
> IP is in _nr_to_section() - seems to be getting somehow
> called by  pte_offset_map_lock() from smaps_pte_range
> (which show_smaps) calls.
> 
> Any ideas on why or how to debug further ? 

>From dave's call graph I'd ask the question whether we should be calling
pfn_valid() before pfn_to_page().  When I reviewed the proposed
pfn_to_page() implementation I only recall one use and that already had
the pfn_valid() in it.  I'll review -rc4 in the morning.

-apw
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