linux-kernel - Re: [PATCH] pidns: reboot_pid_ns: use SEND_SIG_FORCED instead of force

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Message-ID: <20120413192455.GA24464@redhat.com>
Date:	Fri, 13 Apr 2012 21:24:55 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Serge Hallyn <serge.hallyn@...onical.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pidns: reboot_pid_ns: use SEND_SIG_FORCED instead of
	force_sig()

Hi Serge,

On 04/13, Serge Hallyn wrote:
>
> Quoting Oleg Nesterov (oleg@...hat.com):
> > cf3f8921 "pidns: add reboot_pid_ns() to handle the reboot syscall"
> > uses force_sig() to kill the SIGNAL_UNKILLABLE cinit, this was the
> > only choice.
> >
> > After 629d362b we can use SEND_SIG_FORCED instead, force_sig() has
> > the special semantics and should be avoided if possible.
> >
> > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
>
> Hi Oleg,
>
> I like the patch in theory, however after applying it containers are
> no longer able to shutdown/reboot.  I can externally kill them with
> lxc-stop, but internal shutdown fails.

Oh, thanks a lot for testing.

Strange... I even tested this change, but only in the root namespace.
OK, thanks, I'll investigate. I hope you verified your kernel has
629d362b commit ;)

Oleg.

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