linux-kernel - Re: 2.6.28-rc9 panics with crashkernel=256M while booting

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Message-Id: <200901161746.36584.chandru@in.ibm.com>
Date:	Fri, 16 Jan 2009 17:46:36 +0530
From:	Chandru <chandru@...ibm.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: 2.6.28-rc9 panics with crashkernel=256M while booting

On Thursday 15 January 2009 13:35:27 Chandru wrote:
> Hello Dave, From the debug console output, if there is anything you can add
> here, pls let me know.

As we can see from the console output here,  physbase isn't page aligned when 
the panic occurs.  So we could as well send (start_pfn << PAGE_SHIFT) to 
reserve_bootmem_node() instead of physbase. your thoughts ?.

Also end_pfn in mark_reserved_region_for_nid() is defined as 

unsigned long end_pfn = ((physbase + size) >> PAGE_SHIFT);

Does this refer to the pfn after the area that we are interested in ?.  We have 
atleast two fixes here,  
1. Limit start and end to bdata->node_min_pfn  and bdata->node_low_pfn in 
reserve_bootmem_node() and add comments out in there that the caller of the 
funtion should be aware of how much are they reserving. 
2. send (start_pfn << PAGE_SHIFT) to reserve_bootmem_node() instead of 
physbase. 

Chandru
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