linux-kernel - Re: 9a2d43b: __alloc_bootmem

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Date:	Sun, 24 Aug 2008 09:58:42 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Johannes Weiner" <hannes@...urebad.de>
Cc:	"Yinghai Lu" <yhlu.kernel@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: 9a2d43b: __alloc_bootmem_core(): zero-sized request

On Sat, Aug 23, 2008 at 9:12 AM, Johannes Weiner <hannes@...urebad.de> wrote:
> "Vegard Nossum" <vegard.nossum@...il.com> writes:
>>
>> I was trying out
>>
>> commit 9a2d43b7566caeeeb414aa628bc2759028897dbb
>> Date:   Tue Jul 15 21:21:43 2008 +0200
>>
>> ..as part of the debugging of a different issue, but I got this:
>>
>> __alloc_bootmem_core(): zero-sized request

[...]

>> I saw some bootmem errata lately, can I cherry-pick anything to fix
>> this?
>
> This behaviour hasn't changed after the rewrite.

Yep, the error is somewhere else.

Inserted a printk("nr_kernel_pages = %llu\n", nr_kernel_pages); and
this is the output:

nr_kernel_pages = 13869392367443771392

...it looks very, very big. I think this is initialized via
free_area_init_*() functions, which come from arch code. Does x86
experts know if any of this changed recently (i.e. after July 15)?

The whole dmesg and config can be seen here:
http://userweb.kernel.org/~vegard/bugs/20080824-numa/


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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