linux-kernel - Re: mm: BUG in unmap_page

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Message-ID: <540127AC.4040804@oracle.com>
Date:	Fri, 29 Aug 2014 21:23:56 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Hugh Dickins <hughd@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: mm: BUG in unmap_page_range

On 08/27/2014 11:26 AM, Mel Gorman wrote:
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 281870f..ffea570 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -723,6 +723,9 @@ static inline pte_t pte_mknuma(pte_t pte)
>  
>  	VM_BUG_ON(!(val & _PAGE_PRESENT));
>  
> +	/* debugging only, specific to x86 */
> +	VM_BUG_ON(val & _PAGE_PROTNONE);
> +
>  	val &= ~_PAGE_PRESENT;
>  	val |= _PAGE_NUMA;

Triggered again, the first VM_BUG_ON got hit, the second one never did.


Thanks,
Sasha
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