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Date: Mon, 18 Apr 2022 19:19:42 +0200 From: Oleg Nesterov <oleg@...hat.com> To: Peter Zijlstra <peterz@...radead.org> Cc: rjw@...ysocki.net, mingo@...nel.org, vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, mgorman@...e.de, ebiederm@...ssion.com, bigeasy@...utronix.de, Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org, tj@...nel.org, linux-pm@...r.kernel.org Subject: Re: [PATCH 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT_RT On 04/18, Oleg Nesterov wrote: > > static int ptrace_check_attach(struct task_struct *child, bool ignore_state) > { ... > + if (!traced) > + return -ESRCH; > + > + WARN_ON(READ_ONCE(child->__state) == __TASK_TRACED); > + if (ignore_state) > + return 0; > + > + if (!task_is_traced(child)) > + return -ESRCH; This is the new check V1 didn't have, we need it to unsure that check_attach can't miss the change in child->jobctl and call wait_task_inactive() before the child marks itself as "traced" and clears JOBCTL_TRACED_XXX. Oleg.
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