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Date:   Wed, 8 Jul 2020 08:45:24 +0200
From:   Michal Hocko <mhocko@kernel.org>
To:     Qian Cai <cai@lca.pw>
Cc:     js1304@gmail.com, Andrew Morton <akpm@linux-foundation.org>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        kernel-team@lge.com, Vlastimil Babka <vbabka@suse.cz>,
        Christoph Hellwig <hch@infradead.org>,
        Roman Gushchin <guro@fb.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH v3 7/8] mm/mempolicy: use a standard migration target
 allocation callback
Message-ID: <20200708064524.GA7271@dhcp22.suse.cz>
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On Tue 07-07-20 21:20:44, Qian Cai wrote:
[...]
> migrate_pages() starts failing like this apparently using the new
> callback on NUMA systems,
> 
> [ 6147.019063][T45242] LTP: starting move_pages12
> [ 6147.475680][T64921] BUG: unable to handle page fault for address: ffffffffffffffe0

Hmm, this looks like -EPIPE (-32) which is unexpected to say the least.
Does the test pass without this patch applied? Also there has been v4
posted just yesterday. Does it suffer from the same problem?

-- 
Michal Hocko
SUSE Labs