linux-kernel - Re: Q: perf_event && task->ptrace

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Message-Id: <20110118011600.CBD9F180996@magilla.sf.frob.com>
Date:	Mon, 17 Jan 2011 17:16:00 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Prasad <prasad@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: Q: perf_event && task->ptrace_bps[]

> Aah, so we check if the task is stopped when sys_ptrace() is called,
> but right after we do this check, the tracee can be resumed at any time?
> (with either SIGCONT or SIGKILL), even if we are servicing the ptrace
> request at the same time?

Only by SIGKILL.
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