linux-kernel - Re: mm: BUG in unmap_page

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Message-ID: <54082B25.9090600@oracle.com>
Date:	Thu, 04 Sep 2014 05:04:37 -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 08/29/2014 09:23 PM, Sasha Levin wrote:
> 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.

Okay, this bug has reproduced quite a few times since then that I no longer
suspect it's random memory corruption. I'd be happy to try out more debug
patches if you have any leads.


Thanks,
Sasha
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