linux-kernel - Re: OOM killer, page fault

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Date:	Mon, 2 Nov 2009 13:56:40 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Norbert Preining <preining@...ic.at>, linux-kernel@...r.kernel.org,
	linux-mm <linux-mm@...ck.org>
Subject: Re: OOM killer, page fault

On Mon,  2 Nov 2009 13:24:06 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> Hi,
> 
> (Cc to linux-mm)
> 
> Wow, this is very strange log.
> 
> > Dear all,
> > 
> > (please Cc)
> > 
> > With 2.6.32-rc5 I got that one:
> > [13832.210068] Xorg invoked oom-killer: gfp_mask=0x0, order=0, oom_adj=0
> 
> order = 0

I think this problem results from 'gfp_mask = 0x0'.
Is it possible?

If it isn't H/W problem, Who passes gfp_mask with 0x0?
It's culpit. 

Could you add BUG_ON(gfp_mask == 0x0) in __alloc_pages_nodemask's head?

---

/*
 * This is the 'heart' of the zoned buddy allocator.
 */
struct page *
__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
                        struct zonelist *zonelist, nodemask_t *nodemask)
{
        enum zone_type high_zoneidx = gfp_zone(gfp_mask);
        struct zone *preferred_zone;
        struct page *page;
        int migratetype = allocflags_to_migratetype(gfp_mask);

+	BUG_ON(gfp_mask == 0x0);
        gfp_mask &= gfp_allowed_mask;

        lockdep_trace_alloc(gfp_mask);

        might_sleep_if(gfp_mask & __GFP_WAIT);

        if (should_fail_alloc_page(gfp_mask, order))
                return NULL;


-- 
Kind regards,
Minchan Kim
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