linux-kernel - Re: [PATCH v2 2/2] kasan: fix memory hotplug during boot

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Message-ID: <4ec53da0-bdf6-9db4-b70b-6a05c4d40161@redhat.com>
Date:   Wed, 23 May 2018 13:52:03 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "open list:KASAN" <kasan-dev@...glegroups.com>
Subject: Re: [PATCH v2 2/2] kasan: fix memory hotplug during boot

On 23.05.2018 11:59, Andrey Ryabinin wrote:
> 
> 
> On 05/23/2018 12:07 AM, Andrew Morton wrote:
>> On Tue, 22 May 2018 22:50:12 +0300 Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
>>
>>>
>>>
>>> On 05/22/2018 07:36 PM, David Hildenbrand wrote:
>>>> On 22.05.2018 18:26, Andrey Ryabinin wrote:
>>>>>
>>>>>
>>>>> On 05/22/2018 01:07 PM, David Hildenbrand wrote:
>>>>>> Using module_init() is wrong. E.g. ACPI adds and onlines memory before
>>>>>> our memory notifier gets registered.
>>>>>>
>>>>>> This makes sure that ACPI memory detected during boot up will not
>>>>>> result in a kernel crash.
>>>>>>
>>>>>> Easily reproducable with QEMU, just specify a DIMM when starting up.
>>>>>
>>>>>          reproducible
>>>>>>
>>>>>> Signed-off-by: David Hildenbrand <david@...hat.com>
>>>>>> ---
>>>>>
>>>>> Fixes: fa69b5989bb0 ("mm/kasan: add support for memory hotplug")
>>>>> Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
>>>>> Cc: <stable@...r.kernel.org>
>>>>
>>>> Think this even dates back to:
>>>>
>>>> 786a8959912e ("kasan: disable memory hotplug")
>>>>
>>>
>>> Indeed.
>>
>> Is a backport to -stable justified for either of these patches?
>>
> 
> I don't see any reasons to not backport these.
> The first one fixes failure to online memory, why it shouldn't be fixed in -stable?
> The second one is fixes boot crash, it's definitely stable material IMO.
> 

Agreed, at least the second one should be cc stable, as I can reproduce
it with a simple QEMU command.

-- 

Thanks,

David / dhildenb