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Date: Thu, 28 May 2015 13:00:15 +0100
From: Mel Gorman <mgorman@suse.de>
Subject: Re: kernel bug(VM_BUG_ON_PAGE) with 3.18.13 in mm/migrate.c
Message-ID: <20150528120015.GA26425@suse.de>
References: <CABPcSq+uMcDSBU1xt7oRqPXn-89ZpJmxK+C46M7rX7+Y7-x7iQ@mail.gmail.com>
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To: Jovi Zhangwei <jovi@cloudflare.com>
Cc: linux-kernel@vger.kernel.org, sasha.levin@oracle.com, n-horiguchi@ah.jp.nec.com, akpm@linux-foundation.org, hughd@google.com, linux-mm@kvack.org, vbabka@suse.cz, rientjes@google.com

On Wed, May 27, 2015 at 11:05:33AM -0700, Jovi Zhangwei wrote:
> Hi,
> 
> I got below kernel bug error in our 3.18.13 stable kernel.
> "kernel BUG at mm/migrate.c:1661!"
> 
> Source code:
> 
> 1657    static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
> 1658   {
> 1659            int page_lru;
> 1660
> 1661           VM_BUG_ON_PAGE(compound_order(page) &&
> !PageTransHuge(page), page);
> 
> It's easy to trigger the error by run tcpdump in our system.(not sure
> it will easily be reproduced in another system)
> "sudo tcpdump -i bond0.100 'tcp port 4242' -c 100000000000 -w 4242.pcap"
> 
> Any comments for this bug would be great appreciated. thanks.
> 

What sort of compound page is it? What sort of VMA is it in? hugetlbfs
pages should never be tagged for NUMA migrate and never enter this
path. Transparent huge pages are handled properly so I'm wondering
exactly what type of compound page this is and what mapped it into
userspace.

-- 
Mel Gorman
SUSE Labs

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