linux-kernel - Re: mm: kernel BUG at mm/rmap.c:530

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Date:	Sat, 30 Aug 2014 10:28:55 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Dave Jones <davej@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mm: kernel BUG at mm/rmap.c:530

On 08/20/2014 10:02 AM, Kirill A. Shutemov wrote:
> Sasha Levin wrote:
>> > Hi all,
>> > 
>> > While fuzzing with trinity inside a KVM tools guest running the latest -next
>> > kernel, I've stumbled on the following spew:
>> > 
>> > [ 2581.180086] kernel BUG at mm/rmap.c:530!
> Page is mapped where it shouldn't be. Or vma/struct page/pgtable is corrupted.
> Basically, I have no idea what happend :-P
> 
> We really should dump page and vma info there. It's strange we don't have
> dump_vma() helper yet.
> 

Okay, so the dump_vma() helper shows:

[  736.842506] vma ffff8808436fdc00 start           (null) end           (null)
[  736.842506] next           (null) prev           (null) mm           (null)
[  736.842506] prot 0 anon_vma           (null) vm_ops           (null)
[  736.842506] pgoff 0 file           (null) private_data           (null)
[  736.846670] flags: 0x0(


Thanks,
Sasha
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