linux-kernel - Re: [PATCH 08/10] ptrace: participate in group stop from ptrace_stop() iff the task is trapping for group stop

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Date:	Tue, 1 Feb 2011 20:36:36 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 08/10] ptrace: participate in group stop from
	ptrace_stop() iff the task is trapping for group stop

On 01/28, Roland McGrath wrote:
>
> If
> there is a group stop in progress but not yet complete, then PTRACE_CONT
> on a thread in the group should probably just move it from TASK_TRACED
> to TASK_STOPPED without resuming it at all.
>
> Once a group stop is complete, then probably the ideal is that
> PTRACE_CONT would not resume a thread until a real SIGCONT cleared the
> job control stop condition.

Well. I agree. I even tried to mention this before.

Or, if PTRACE_CONT resumes the tracee it should clear SIGNAL_STOP_STOPPED.

> But it's likely that existing ptrace users
> have expectations contrary to that,

Sure ;)




Btw. I just realized that I didn't reply explicitly to this series.
Because I thought we already discussed everything and I have nothing
to add. I think that everything is technically correct. I mean, I
believe the patches do exactly what the changelog says.

Oleg.

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