linux-kernel - Re: [BUG] sysrq-m oops

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Date:	Thu, 07 Jun 2007 21:39:16 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Bob Picco <bob.picco@...com>
CC:	Chuck Ebbert <cebbert@...hat.com>,
	john stultz <johnstul@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Sripathi Kodi <sripathik@...ibm.com>,
	Bernhard Walle <bwalle@...e.de>,
	"Eric W. Biederman"@redhat.com, acme@...hat.com
Subject: Re: [BUG] sysrq-m oops

Bob Picco wrote:
> Chuck Ebbert wrote:	[Thu Jun 07 2007, 11:42:38AM EDT]
>> On 06/06/2007 08:27 PM, john stultz wrote:
>>> Hey All,
>>> 	With 2.6.21 and the current -git, we're seeing the following oops when
>>> we try sysrq-m:
>>>
>> It's here in arch/x86_64/mm/init.c::show_mem():
>>
>>         for_each_online_pgdat(pgdat) {
>>                for (i = 0; i < pgdat->node_spanned_pages; ++i) {
> This is probably with sparsemem? I'm working with acme@...hat.com to
> test a patch. Basically you need to validate the pfn because it
> could be in a hole. Most arches which support sparsemem perform this
> check.
> 
> 			if (!pfn_valid(pgdat->node_start_pfn + i))
> 				continue;
> bob

Yep you would want one of those for sure with sparsemem.

-apw
>>                         page = pfn_to_page(pgdat->node_start_pfn + i);
>>                         total++;
>>  ======>                if (PageReserved(page))
>>                                 reserved++;
>>                         else if (PageSwapCache(page))
>>                                 cached++;
>>                         else if (page_count(page))
>>                                 shared += page_count(page) - 1;
>>                }
>>         }
>>
>> page is completely bogus (it's 0x0000000003480000)
>> -
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