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

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Message-ID: <20180404021746.m77czxidkaumkses@xakep.localdomain>
Date:   Tue, 3 Apr 2018 22:17:46 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     Sasha Levin <Alexander.Levin@...rosoft.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 18-03-15 20:43:14, Sasha Levin wrote:
> 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 :)

Hi Sasha,

I have registered on Azure's portal, and created a VM with 4 CPUs and 16G
of RAM. However, I still was not able to reproduce the boot bug you found.

Could you please try an updated patch that I sent out today, the panic
message should improve:

https://lkml.org/lkml/2018/4/3/583

Thank you,
Pasha