linux-kernel - Re: [criu] 1M guard page ruined restore

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Message-ID: <20170621173115.GA28723@redhat.com>
Date:   Wed, 21 Jun 2017 19:31:15 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>
Cc:     Cyrill Gorcunov <gorcunov@...il.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrey Vagin <avagin@...nvz.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Adrian Reber <areber@...hat.com>
Subject: Re: [criu] 1M guard page ruined restore

On 06/21, Dmitry Safonov wrote:
>
> The only question I have - how is it connected to guard page?

Because with stack guard page do_page_fault() almost never needs to
call expand_stack(), thus this check was almost never tested, I guess.
Probably it should go away now.

I'll write the changelog and patch tomorrow, unless someone does this
before.

Oleg.