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From: =?UTF-8?B?Um9nZXIgUGF1IE1vbm7DqQ==?= <roger.pau@citrix.com>
Subject: Re: broken live migration in xen 4.3 (release)
Date: Tue, 18 Mar 2014 10:49:06 +0100
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To: Ian Campbell <Ian.Campbell@citrix.com>, Vasiliy Tolstov <v.tolstov@selfip.ru>
Cc: xen-devel@lists.xenproject.org, Ian Jackson <Ian.Jackson@eu.citrix.com>
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On 18/03/14 10:36, Ian Campbell wrote:
> On Tue, 2014-03-18 at 03:25 +0400, Vasiliy Tolstov wrote:
>> I'm solve my issue. /etc/xen/scripts/vif-ospf (my own network script)
>> have which ethtool not redirected to /dev/null.
>> When domain started i don't have errors, but when migration appeared
>> last message has been /sbin/ethtool. Thanks Ian Campbell and Ian
>> Jackson!
> 
> Great.
> 
> Did you by any chance produce a debug patch to help you track this down
> (e.g. to log the unexpected message)? If so then that might be something
> which is useful to others diagnosing the same issue -- would you mind
> submitting it? See http://wiki.xen.org/wiki/Submitting_Xen_Patches for
> guidance. (Even if it is unsuitable for applying it would perhaps be
> helpful to have in the list archives to point at)
> 
> Roger, where should the hotplug scripts be logging to? Should we
> consider slurping up stdout/stderr of the script to somewhere other than
> xl's std*?

IMHO I like hotplug messages to be printed on screen while using xl
create/destroy... But for migration it should be redirected to /dev/null
or some suitable logfile I guess.

Or maybe a more canonical way to deal with this would be to always
redirect the output of hotplug scripts to a temp file, and in case of
not doing a migration print the contents of the file after executing the
hotplug script.

Roger.