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Subject: Re: Testing lxc 0.6.5 in Fedora 13
From: Greg Kurz <gkurz@fr.ibm.com>
To: Matt Helsley <matthltc@us.ibm.com>
Cc: Grzegorz Nosek <root@localdomain.pl>,
       containers@lists.linux-foundation.org, Oleg Nesterov <oleg@redhat.com>,
       Roland McGrath <roland@redhat.com>, linux-kernel@vger.kernel.org
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Date: Wed, 24 Mar 2010 10:25:56 +0100
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On Tue, 2010-03-23 at 14:28 -0700, Matt Helsley wrote:
> On Sun, Mar 21, 2010 at 08:50:44PM +0100, Grzegorz Nosek wrote:
> 
> <snip>
> 
> > 2. Weird strace behaviour across pidns boundary
> > 
> > When strace'ing (with -ff) lxc-start, I get a proper strace for the
> > directly spawned process and the container init. However, any processes
> > spawned by the container's init are not straced properly (I get two
> > empty files, named <foo>.<pid-in-root-ns> and <foo>.2 -- presumably pid
> > inside the container). The container also seems to malfunction under
> > strace (looks like exec() failing as lxc-ps shows two "init" processes).
> > 

<snip>

> > 
> > 'strace ls' ran completely inside the container works as expected.
> 
> I'm suprised strace of ls works across pid namespaces. I've been looking

Matt,

Grzegorz is telling you that 'strace -ff lxc-start ls' is broken but
'lxc-start strace -ff ls' works as expected => strace of ls doesn't work
across pid namespaces. No surprise.

Cheers.

-- 
Gregory Kurz                                     gkurz@fr.ibm.com
Software Engineer @ IBM/Meiosys                  http://www.ibm.com
Tel +33 (0)534 638 479                           Fax +33 (0)561 400 420

"Anarchy is about taking complete responsibility for yourself."
        Alan Moore.