linux-kernel - Re: Testing lxc 0.6.5 in Fedora 13

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Message-ID: <20100326133439.GA15790@redhat.com>
Date:	Fri, 26 Mar 2010 14:34:39 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Matt Helsley <matthltc@...ibm.com>
Cc:	Grzegorz Nosek <root@...aldomain.pl>,
	Roland McGrath <roland@...hat.com>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: Testing lxc 0.6.5 in Fedora 13

On 03/26, Matt Helsley wrote:
>
> On Fri, Mar 26, 2010 at 01:00:28PM +0100, Oleg Nesterov wrote:
> > 
> > > +               ptrace_pid_vnr = nr;
> > > +               if (unlikely(p->parent != p->real_parent)) {
> > > +                       rcu_read_lock();
> > > +                       ptrace_pid_vnr = task_pid_nr_ns(p, p->parent->nsproxy->pid_ns);
> > 
> > Yes, this is what I meant.
> > 
> > But we should not do this in do_fork().
> 
> I'm puzzled. If not here, where should we do this? Or are you saying
> ptrace should take a reference to the pid,

Ah, no, sorry.

I meant tracehook_report_clone_complete should do this under "if (trace)".
And we need a helper to get the right pid, it could be used
by do_notify_parent() too, and (probably) we need more changes like this.

> > But once again. This change fixes the value in "tracee->ptrace_message == newpid",
> > but a quick grep shows that strace-4.5.19 doesn't use PTRACE_GETEVENTMSG at all.
>
> You are correct. However strace and gdb aren't necessarily the only users
> of ptrace so wouldn't it still be good to fix this?

Yes, agreed.

Oh. The only problem is utrace patches in -mm. I mean the possible textual
conflicts...

Oleg.

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