linux-kernel - Re: Recurring warning in page_copy_sane (inside copy_page_to_iter) when running stress tests involving drop

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Date:   Wed, 15 May 2019 17:37:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Lech Perczak <l.perczak@...lintechnologies.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Eric Dumazet <edumazet@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Piotr Figiel <p.figiel@...lintechnologies.com>,
        Krzysztof Drobiński 
        <k.drobinski@...lintechnologies.com>,
        Pawel Lenkow <p.lenkow@...lintechnologies.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Recurring warning in page_copy_sane (inside copy_page_to_iter)
 when running stress tests involving drop_caches

On Wed, May 15, 2019 at 08:20:35AM -0700, Matthew Wilcox wrote:
> On Wed, May 15, 2019 at 05:04:06PM +0200, Greg Kroah-Hartman wrote:
> > > Greg, can you consider 6daef95b8c914866a46247232a048447fff97279 for
> > > backporting to stable?  Nobody realised it was a bugfix at the time it
> > > went in.  I suspect there aren't too many of us running HIGHMEM kernels
> > > any more.
> > > 
> > 
> > Sure, what kernel version(s) should this go to?  4.19 and newer?
> 
> Looks like the problem was introduced with commit
> a90bcb86ae700c12432446c4aa1819e7b8e172ec so 4.14 and newer, I think.

Ok, I'll look into it after this round of stable kernels are released,
thanks.

greg k-h