linux-kernel - Re: KASAN: use-after-free Read in filemap

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Message-ID: <20181228220152.wkeslziuovnunvwk@kshutemo-mobl1>
Date:   Sat, 29 Dec 2018 01:01:52 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     syzbot <syzbot+b437b5a429d680cf2217@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, darrick.wong@...cle.com,
        hannes@...xchg.org, hughd@...gle.com, jack@...e.cz,
        josef@...icpanda.com, jrdr.linux@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        sfr@...b.auug.org.au, syzkaller-bugs@...glegroups.com,
        willy@...radead.org
Subject: Re: KASAN: use-after-free Read in filemap_fault

On Fri, Dec 28, 2018 at 12:51:04PM -0800, syzbot wrote:
> Allocated by task 8196:

...

> Freed by task 8197:

Hm. VMA allocated by one process (I don't see threads in the test case)
gets freed by another one. Looks fishy to me.

-- 
 Kirill A. Shutemov