linux-kernel - Re: [PATCH v2 1/2] mm: uninitialized struct page poisoning sanity checking

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Message-ID: <20180315204312.n7p4zzrftgg6m7zw@sasha-lappy>
Date:   Thu, 15 Mar 2018 20:43:14 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
CC:     "steven.sistare@...cle.com" <steven.sistare@...cle.com>,
        "daniel.m.jordan@...cle.com" <daniel.m.jordan@...cle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "mhocko@...e.com" <mhocko@...e.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "bharata@...ux.vnet.ibm.com" <bharata@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 1/2] mm: uninitialized struct page poisoning sanity
 checking

On Thu, Mar 15, 2018 at 03:04:30PM -0400, Pavel Tatashin wrote:
>>
>> Attached the config. It just happens on boot.
>
>Hi Sasha,
>
>I have tried unsuccessfully to reproduce the bug in qemu with 20G RAM,
>and 8 CPUs.
>
>Patch "mm: uninitialized struct page poisoning sanity" should be improved
>to make dump_page() to detect poisoned struct page, and simply print hex
>in such case. I will send an updated patch later.
>
>How do you run this on Microsoft hypervisor? Do I need Windows 10 for
>that?

Booting a Linux VM on Azure would be the easiest, and free too :)

>BTW, I am going to be on vacation for the next two week (going to Israel),
>so I may not be able to response quickly.

Have fun!

We may need to hold off on getting this patch merged for the time being.

-- 

Thanks,
Sasha