linux-kernel - Re: mm, something wring in page_lock_anon_vma

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Message-ID: <alpine.LSU.2.11.1705191935220.11750@eggly.anvils>
Date:   Fri, 19 May 2017 19:40:38 -0700 (PDT)
From:   Hugh Dickins <hughd@...gle.com>
To:     Xishi Qiu <qiuxishi@...wei.com>
cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Minchan Kim <minchan@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, aarcange@...hat.com,
        sumeet.keswani@....com, Rik van Riel <riel@...hat.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        zhong jiang <zhongjiang@...wei.com>
Subject: Re: mm, something wring in page_lock_anon_vma_read()?

On Sat, 20 May 2017, Xishi Qiu wrote:
> 
> Here is a bug report form redhat: https://bugzilla.redhat.com/show_bug.cgi?id=1305620
> And I meet the bug too. However it is hard to reproduce, and 
> 624483f3ea82598("mm: rmap: fix use-after-free in __put_anon_vma") is not help.
> 
> From the vmcore, it seems that the page is still mapped(_mapcount=0 and _count=2),
> and the value of mapping is a valid address(mapping = 0xffff8801b3e2a101),
> but anon_vma has been corrupted.
> 
> Any ideas?

Sorry, no.  I assume that _mapcount has been misaccounted, for example
a pte mapped in on top of another pte; but cannot begin tell you where
in Red Hat's kernel-3.10.0-229.4.2.el7 that might happen.

Hugh