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

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Message-ID: <096624be-802b-822d-36d7-2e6585e6f2b5@virtuozzo.com>
Date:   Wed, 21 Jun 2017 20:37:41 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     Oleg Nesterov <oleg@...hat.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 06/21/2017 08:31 PM, Oleg Nesterov wrote:
> 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.

Ah, indeed! Thanks for explanation.

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

-- 
              Dmitry