Re: [PATCH -next v5 0/3] support concurrent sync io for bfq on a specail occasion

[Yu Kuai]

在 2022/06/07 19:51, Yu Kuai 写道:
> 在 2022/06/07 17:54, Jan Kara 写道:
> > On Tue 07-06-22 11:10:27, Yu Kuai wrote:
> > > 在 2022/05/23 23:25, Jan Kara 写道:
> > > > Hum, for me all emails from Huawei I've received even today fail the 
> > > > DKIM
> > > > check. After some more digging there is interesting inconsistency in 
> > > > DMARC
> > > > configuration for huawei.com domain. There is DMARC record for 
> > > > huawei.com
> > > > like:
> > > >
> > > > huawei.com.        600    IN    TXT    
> > > > "v=DMARC1;p=none;rua=mailto:dmarc@xxxxxxxxxxxxxx";
> > > >
> > > > which means no DKIM is required but _dmarc.huawei.com has:
> > > >
> > > > _dmarc.huawei.com.    600    IN    TXT    
> > > > "v=DMARC1;p=quarantine;ruf=mailto:dmarc@xxxxxxxxxx;rua=mailto:dmarc@xxxxxxxxxx"; 
> > > >
> > > >
> > > > which says that DKIM is required. I guess this inconsistency may be the
> > > > reason why there are problems with DKIM validation for senders from
> > > > huawei.com. Yu Kuai, can you perhaps take this to your IT support to 
> > > > fix
> > > > this? Either make sure huawei.com emails get properly signed with 
> > > > DKIM or
> > > > remove the 'quarantine' record from _dmarc.huawei.com. Thanks!
> > > >
> > > >                                 Honza
> > > Hi, Jan and Jens
> > >
> > > I just got response from our IT support:
> > >
> > > 'fo' is not set in our dmarc configuration(default is 0), which means
> > > SPF and DKIM verify both failed so that emails will end up in spam.
> > >
> > > It right that DKIM verify is failed because there is no signed key,
> > > however, our IT support are curious how SPF verify faild.
> > >
> > > Can you guys please take a look at ip address of sender? So our IT
> > > support can take a look if they miss it from SPF records.
> >
> > So SPF is what makes me receive direct emails from you. For example on 
> > this
> > email I can see:
> >
> > Received: from frasgout.his.huawei.com (frasgout.his.huawei.com
> >          [185.176.79.56])
> >          (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 
> > (128/128
> >          bits))
> >          (No client certificate requested)
> >          by smtp-in2.suse.de (Postfix) with ESMTPS id 4LHFjN2L0dzZfj
> >          for <jack@xxxxxxx>; Tue,  7 Jun 2022 03:10:32 +0000 (UTC)
> > ...
> > Authentication-Results: smtp-in2.suse.de;
> >          dkim=none;
> >          dmarc=pass (policy=quarantine) header.from=huawei.com;
> >          spf=pass (smtp-in2.suse.de: domain of yukuai3@xxxxxxxxxx 
> > designates
> >          185.176.79.56 as permitted sender) 
> > smtp.mailfrom=yukuai3@xxxxxxxxxx
> >
> > So indeed frasgout.his.huawei.com is correct outgoing server which makes
> > smtp-in2.suse.de believe the email despite missing DKIM signature. But 
> > the
> > problem starts when you send email to a mailing list. Let me take for
> > example your email from June 2 with Message-ID
> > <20220602082129.2805890-1-yukuai3@xxxxxxxxxx>, subject "[PATCH -next]
> > mm/filemap: fix that first page is not mark accessed in filemap_read()".
> > There the mailing list server forwards the email so we have:
> >
> > Received: from smtp-in2.suse.de ([192.168.254.78])
> >          (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 
> > bits))
> >          by dovecot-director2.suse.de with LMTPS
> >          id 8MC5NfVvmGIPLwAApTUePA
> >          (envelope-from <linux-fsdevel-owner@xxxxxxxxxxxxxxx>)
> >          for <jack@xxxxxxxxxxxx>; Thu, 02 Jun 2022 08:08:21 +0000
> > Received: from out1.vger.email (out1.vger.email 
> > [IPv6:2620:137:e000::1:20])
> >          by smtp-in2.suse.de (Postfix) with ESMTP id 4LDJYK5bf0zZg5
> >          for <jack@xxxxxxx>; Thu,  2 Jun 2022 08:08:21 +0000 (UTC)
> > Received: (majordomo@xxxxxxxxxxxxxxx) by vger.kernel.org via listexpand
> >          id S232063AbiFBIIM (ORCPT <rfc822;jack@xxxxxxx>);
> >          Thu, 2 Jun 2022 04:08:12 -0400
> > Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56178 "EHLO
> >          lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by
> >          vger.kernel.org
> >          with ESMTP id S232062AbiFBIIL (ORCPT
> >          <rfc822;linux-fsdevel@xxxxxxxxxxxxxxx>);
> >          Thu, 2 Jun 2022 04:08:11 -0400
> > Received: from szxga02-in.huawei.com (szxga02-in.huawei.com 
> > [45.249.212.188])
> >          by lindbergh.monkeyblade.net (Postfix) with ESMTPS id
> >          75DDB25FE;
> >          Thu,  2 Jun 2022 01:08:08 -0700 (PDT)
> >
> > and thus smtp-in2.suse.de complains:
> >
> > Authentication-Results: smtp-in2.suse.de;
> >          dkim=none;
> >          dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM"
> >          header.from=huawei.com (policy=quarantine);
> >          spf=pass (smtp-in2.suse.de: domain of
> >          linux-fsdevel-owner@xxxxxxxxxxxxxxx designates 
> > 2620:137:e000::1:20 as
> >          permitted sender) 
> > smtp.mailfrom=linux-fsdevel-owner@xxxxxxxxxxxxxxx
> >
> > Because now we've got email with "From" header from huawei.com domain 
> > from
> > a vger mail server which was forwarding it. So SPF has no chance to match
> > (in fact SPF did pass for the Return-Path header which points to
> > vger.kernel.org but DMARC defines that if "From" and "Return-Path" do not
> > match, additional validation is needed - this is the "SPF not aligned
> > (relaxed)" message above). And missing DKIM (the additional validation
> > method) sends the email to spam.
>
> Thanks a lot for your analysis, afaics, in order to fix the
> problem, either your mail server change the configuration to set
> alignment mode to "relaxed" instead of "strict", or our mail server
> add correct DKIM signature for emails.
>
> I'll contact with our IT support and try to add DKIM signature.
>
> Thanks,
> Kuai

Hi, Jan

Our IT support is worried that add DKIM signature will degrade
performance, may I ask that how is your mail server configuation? policy
is quarantine or none, and dkim signature is supportted or not.

Thanks,
Kuai