linux-kernel - Re: [Question] Missing data after DMA read transfer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <60fc4f9f-fc8e-84a4-da84-a3c823b9b5bb@morey-chaisemartin.com>
Date:	Wed, 11 May 2016 13:15:54 +0200
From:	Nicolas Morey Chaisemartin <devel@...ey-chaisemartin.com>
To:	Jerome Glisse <j.glisse@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [Question] Missing data after DMA read transfer - mm issue with
 transparent huge page?



Le 05/10/2016 à 12:01 PM, Jerome Glisse a écrit :
> On Tue, May 10, 2016 at 09:04:36AM +0200, Nicolas Morey Chaisemartin wrote:
>> Le 05/03/2016 à 12:11 PM, Jerome Glisse a écrit :
>>> On Mon, May 02, 2016 at 09:04:02PM -0700, Hugh Dickins wrote:
>>>> On Fri, 29 Apr 2016, Nicolas Morey Chaisemartin wrote:
[...]
>> Hi,
>>
>> I backported the patch to 3.10 (had to copy paste pmd_protnone defitinition from 4.5) and it's working !
>> I'll open a ticket in Redhat tracker to try and get this fixed in RHEL7.
>>
>> I have a dumb question though: how can we end up in numa/misplaced memory code on a single socket system?
>>
> This patch is not a fix, do you see bug message in kernel log ? Because if
> you do that it means we have a bigger issue.
>
> You did not answer one of my previous question, do you set get_user_pages
> with write = 1 as a paremeter ?
>
> Also it would be a lot easier if you were testing with lastest 4.6 or 4.5
> not RHEL kernel as they are far appart and what might looks like same issue
> on both might be totaly different bugs.
>
> If you only really care about RHEL kernel then open a bug with Red Hat and
> you can add me in bug-cc <jglisse@...hat.com>
>
> Cheers,
> Jérôme

I finally managed to get a proper setup.
I build a vanilla 4.5 kernel from git tree using the Centos7 config, my test fails as usual.
I applied your patch, rebuild => still fails and no new messages in dmesg.

Now that I don't have to go through the RPM repackaging, I can try out things much quicker if you have any ideas.

Nicolas