linux-kernel - Re: [PATCH 0/3] orphaned pgrp fixes

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Date:	Tue,  4 Mar 2008 17:11:17 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] orphaned pgrp fixes

> However, SIGNAL_STOP_STOPPED doesn't relaible with ptrace. I mean, ptracer
> doesn't clear SIGNAL_STOP_STOPPED. This is btw one of the problems which
> complicates fixing do_wait(WSTOPPED).

We can clean that up too if you'd like to bring up the details.

> As for SIGNAL_STOP_STOPPING... I am dreaming to find the way to eliminate
> this lock-drop in get_signal_to_deliver(). Not sure this is possible, but
> it is so nasty. For example, SIGNAL_STOP_DEQUEUED is racy, and I don't know
> how to fix this. The patch we discussed some time ago doesn't really work
> because dequeue_signal() drops the lock too. The latter is fixable afaics,
> but needs very ugly changes.

It all certainly deserves more careful thought.


Thanks,
Roland
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