linux-kernel - Re: f45ec5ff16 ("userfaultfd: wp: support swap and page migration"): [ 140.777858] BUG: Bad rss-counter state mm:b278fc66 type:MM

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Message-ID: <20200410153805.GA21484@bombadil.infradead.org>
Date:   Fri, 10 Apr 2020 08:38:05 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Xu <peterx@...hat.com>
Cc:     Hillf Danton <hdanton@...a.com>, kernel test robot <lkp@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-kernel@...r.kernel.org
Subject: Re: f45ec5ff16 ("userfaultfd: wp: support swap and page migration"):
 [  140.777858] BUG: Bad rss-counter state mm:b278fc66 type:MM_ANONPAGES
 val:1

On Fri, Apr 10, 2020 at 11:32:34AM -0400, Peter Xu wrote:
> I'm still trying to digest on what's happened... It would be good too
> if more information on the test could be given, e.g., what is the
> behavior of trinity-c2. A reproducer is of course even better.

Trinity is a syscall fuzzer.  Don't expect what it's doing to make any
sense, it's just executing syscalls at random.