linux-kernel - Re: early exception error

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Date:	Sun, 04 Jan 2009 01:24:03 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	david@...g.hm, Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>, yhlu.kernel@...il.com
Subject: Re: early exception error

On 01/03/2009 10:24 PM, Cyrill Gorcunov wrote:
> [Cyrill Gorcunov - Sat, Jan 03, 2009 at 10:03:16PM +0300]
> | (list restored)
> | 
> | [david@...g.hm - Sat, Jan 03, 2009 at 11:19:00AM -0800]
> | ...
> | >>>
> | >>> two new screenshots at http://linux.lang.hm/linux
> | >>>
> | >>> 36 is a boot with just earlyprintk=vga
> | >>> 37 is a boot with numa=noacpi
> | >>> I also put the vmlinux file there, I'll put the System.map and config
> | >>> there later (I did enable kernel_debug on this build as well)
> | >>>
> | >>> David Lang
> | >>>
> | >>
> | >> David, I can't find vmlinux neither .config?
> | >> Maybe they have hidden attribute?
> | 
> | ok, according to failing address we've a BUG_ON
> | triggered
> | 
> | ---
> | (gdb) l *0xffffffff8096452a
> | 0xffffffff8096452a is in alloc_bootmem_core (mm/bootmem.c:442).
> | 437		unsigned long fallback = 0;
> | 438		unsigned long min, max, start, sidx, midx, step;
> | 439	
> | 440		BUG_ON(!size);
> | 441		BUG_ON(align & (align - 1));
> | 442		BUG_ON(limit && goal + size > limit);
> | 443	
> | 444		if (!bdata->node_bootmem_map)
> | 445			return NULL;
> | 446	
> | (gdb) 
> | ---
> | 
> | so we're in attempt to overrun 'limit'.
> | Hmm...
> | 
> | 		- Cyrill -
> 
> Hardly possible that we trigger BUG here since I don't
> see BUG: on the photo. Investigating.

Hint: line 442 in 2.6.28 is
if (!bdata->node_bootmem_map)
;)

It's:
0xffffffff8096452a <alloc_bootmem_core+69>:     cmpq   $0x0,0x10(%rbp)
and hence cr2 is 10.

node_data[nid] is NULL... But both of them are set up. Maybe too high nid (and
pnum in sparse_init)?
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