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From: "Eric W. Biederman" <ebiederm@xmission.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: rjw@rjwysocki.net, oleg@redhat.com, mingo@kernel.org,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, mgorman@suse.de, bigeasy@linutronix.de,
	Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org, tj@kernel.org,
	linux-pm@vger.kernel.org
Subject: Re: [PATCH v2 1/5] sched,signal,ptrace: Rework TASK_TRACED, TASK_STOPPED state
Date: Tue, 26 Apr 2022 18:34:09 -0500	[thread overview]
Message-ID: <87fslzfmha.fsf@email.froward.int.ebiederm.org> (raw)
In-Reply-To: <20220421150654.757693825@infradead.org> (Peter Zijlstra's message of "Thu, 21 Apr 2022 17:02:49 +0200")

Peter Zijlstra <peterz@infradead.org> writes:

> Currently ptrace_stop() / do_signal_stop() rely on the special states
> TASK_TRACED and TASK_STOPPED resp. to keep unique state. That is, this
> state exists only in task->__state and nowhere else.
>
> There's two spots of bother with this:
>
>  - PREEMPT_RT has task->saved_state which complicates matters,
>    meaning task_is_{traced,stopped}() needs to check an additional
>    variable.
>
>  - An alternative freezer implementation that itself relies on a
>    special TASK state would loose TASK_TRACED/TASK_STOPPED and will
>    result in misbehaviour.
>
> As such, add additional state to task->jobctl to track this state
> outside of task->__state.
>
> NOTE: this doesn't actually fix anything yet, just adds extra state.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -770,7 +773,9 @@ void signal_wake_up_state(struct task_st
>  	 * By using wake_up_state, we ensure the process will wake up and
>  	 * handle its death signal.
>  	 */
> -	if (!wake_up_state(t, state | TASK_INTERRUPTIBLE))
> +	if (wake_up_state(t, state | TASK_INTERRUPTIBLE))
> +		t->jobctl &= ~(JOBCTL_STOPPED | JOBCTL_TRACED);
> +	else
>  		kick_process(t);
>  }

This hunk is subtle and I don't think it is actually what we want if the
code is going to be robust against tsk->__state becoming TASK_FROZEN.

I think we want the clearing of JOBCTL_STOPPED and JOBCTL_TRACED
to be independent of what tsk->__state and tsk->saved_state are.

Something like:

static inline void signal_wake_up(struct task_struct *t, bool resume)
{
	unsigned int state = 0;
	if (resume && !(t->jobctl & JOBCTL_DELAY_WAKEKILL)) {
		t->jobctl &= ~(JOBCTL_STOPPED | JOBCTL_TRACED);
		state = TASK_WAKEKILL;
	}
	signal_wake_up_state(t, state);
}

static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
{
	unsigned int state = 0;
	if (resume) {
		t->jobctl &= ~JOBCTL_TRACED;
		state = __TASK_TRACED;
	}
	signal_wake_up_state(t, state);
}

That would allow __set_task_special in the final patch to look like:

/*
 * The special task states (TASK_STOPPED, TASK_TRACED) keep their canonical
 * state in p->jobctl. If either of them got a wakeup that was missed because
 * TASK_FROZEN, then their canonical state reflects that and the below will
 * refuse to restore the special state and instead issue the wakeup.
 */
static int __set_task_special(struct task_struct *p, void *arg)
{
        unsigned int state = 0;

	if (p->jobctl & JOBCTL_TRACED)
        	state = TASK_TRACED;

	else if (p->jobctl & JOBCTL_STOPPED)
		state = TASK_STOPPED;

	if (state)
		WRITE_ONCE(p->__state, state);

	return state;
}


With no need to figure out if a wake_up was dropped and reverse engineer
what the wakeup was.

Eric


  reply	other threads:[~2022-04-26 23:34 UTC|newest]

Thread overview: 572+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-21 15:02 [PATCH v2 0/5] ptrace-vs-PREEMPT_RT and freezer rewrite Peter Zijlstra
2022-04-21 15:02 ` [PATCH v2 1/5] sched,signal,ptrace: Rework TASK_TRACED, TASK_STOPPED state Peter Zijlstra
2022-04-26 23:34   ` Eric W. Biederman [this message]
2022-04-28 10:00     ` Peter Zijlstra
2022-04-21 15:02 ` [PATCH v2 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT_RT Peter Zijlstra
2022-04-21 18:23   ` Oleg Nesterov
2022-04-21 19:58     ` Peter Zijlstra
2022-04-21 18:40   ` Eric W. Biederman
2022-04-26 22:50     ` [PATCH 0/9] ptrace: cleaning up ptrace_stop Eric W. Biederman
2022-04-26 22:50       ` Eric W. Biederman
2022-04-26 22:52       ` [PATCH 1/9] signal: Rename send_signal send_signal_locked Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-28 10:27         ` Peter Zijlstra
2022-04-28 10:27           ` Peter Zijlstra
2022-04-26 22:52       ` [PATCH 2/9] signal: Replace __group_send_sig_info with send_signal_locked Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-26 22:52       ` [PATCH 3/9] ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-27  7:10         ` Johannes Berg
2022-04-27  7:10           ` Johannes Berg
2022-04-27 13:50           ` Eric W. Biederman
2022-04-27 13:50             ` Eric W. Biederman
2022-04-26 22:52       ` [PATCH 4/9] ptrace/xtensa: Replace PT_SINGLESTEP " Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-26 23:33         ` Max Filippov
2022-04-26 23:33           ` Max Filippov
2022-04-26 22:52       ` [PATCH 5/9] signal: Protect parent child relationships by childs siglock Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-27  6:40         ` Sebastian Andrzej Siewior
2022-04-27  6:40           ` Sebastian Andrzej Siewior
2022-04-27 13:35           ` Eric W. Biederman
2022-04-27 13:35             ` Eric W. Biederman
2022-04-26 22:52       ` [PATCH 6/9] signal: Always call do_notify_parent_cldstop with siglock held Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-27 14:10         ` Oleg Nesterov
2022-04-27 14:10           ` Oleg Nesterov
2022-04-27 14:20           ` Eric W. Biederman
2022-04-27 14:20             ` Eric W. Biederman
2022-04-27 14:43             ` Oleg Nesterov
2022-04-27 14:43               ` Oleg Nesterov
2022-04-27 14:47             ` Eric W. Biederman
2022-04-27 14:47               ` Eric W. Biederman
2022-04-28 17:44               ` Peter Zijlstra
2022-04-28 17:44                 ` Peter Zijlstra
2022-04-28 18:22                 ` Oleg Nesterov
2022-04-28 18:22                   ` Oleg Nesterov
2022-04-28 18:37                 ` Eric W. Biederman
2022-04-28 18:37                   ` Eric W. Biederman
2022-04-28 20:49                   ` Eric W. Biederman
2022-04-28 20:49                     ` Eric W. Biederman
2022-04-28 22:19                     ` Peter Zijlstra
2022-04-28 22:19                       ` Peter Zijlstra
2022-04-27 14:56         ` Oleg Nesterov
2022-04-27 14:56           ` Oleg Nesterov
2022-04-27 15:00           ` Oleg Nesterov
2022-04-27 15:00             ` Oleg Nesterov
2022-04-27 21:52             ` Eric W. Biederman
2022-04-27 21:52               ` Eric W. Biederman
2022-04-28 10:38         ` Peter Zijlstra
2022-04-28 10:38           ` Peter Zijlstra
2022-04-26 22:52       ` [PATCH 7/9] ptrace: Simplify the wait_task_inactive call in ptrace_check_attach Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-27 13:42         ` Eric W. Biederman
2022-04-27 13:42           ` Eric W. Biederman
2022-04-27 14:27           ` Eric W. Biederman
2022-04-27 14:27             ` Eric W. Biederman
2022-04-27 15:14         ` Oleg Nesterov
2022-04-27 15:14           ` Oleg Nesterov
2022-04-28 10:42           ` Peter Zijlstra
2022-04-28 10:42             ` Peter Zijlstra
2022-04-28 11:19             ` Oleg Nesterov
2022-04-28 11:19               ` Oleg Nesterov
2022-04-28 13:54               ` Peter Zijlstra
2022-04-28 13:54                 ` Peter Zijlstra
2022-04-28 14:57                 ` Oleg Nesterov
2022-04-28 14:57                   ` Oleg Nesterov
2022-04-28 16:09                   ` Peter Zijlstra
2022-04-28 16:09                     ` Peter Zijlstra
2022-04-28 16:19                     ` Oleg Nesterov
2022-04-28 16:19                       ` Oleg Nesterov
2022-04-26 22:52       ` [PATCH 8/9] ptrace: Use siglock instead of tasklist_lock " Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-27 15:20         ` Oleg Nesterov
2022-04-27 15:20           ` Oleg Nesterov
2022-04-26 22:52       ` [PATCH 9/9] ptrace: Don't change __state Eric W. Biederman
2022-04-26 22:52         ` Eric W. Biederman
2022-04-27 15:41         ` Oleg Nesterov
2022-04-27 15:41           ` Oleg Nesterov
2022-04-27 22:35           ` Eric W. Biederman
2022-04-27 22:35             ` Eric W. Biederman
2022-04-27 16:09         ` Oleg Nesterov
2022-04-27 16:33           ` Eric W. Biederman
2022-04-27 17:18             ` Oleg Nesterov
2022-04-27 17:18               ` Oleg Nesterov
2022-04-27 17:21               ` Oleg Nesterov
2022-04-27 17:21                 ` Oleg Nesterov
2022-04-27 17:31                 ` Eric W. Biederman
2022-04-27 17:31                   ` Eric W. Biederman
2022-04-27 23:05         ` Eric W. Biederman
2022-04-27 23:05           ` Eric W. Biederman
2022-04-28 15:11           ` Oleg Nesterov
2022-04-28 15:11             ` Oleg Nesterov
2022-04-28 16:50             ` Eric W. Biederman
2022-04-28 16:50               ` Eric W. Biederman
2022-04-28 18:53               ` Oleg Nesterov
2022-04-28 18:53                 ` Oleg Nesterov
2022-04-28 10:07       ` [PATCH 0/9] ptrace: cleaning up ptrace_stop Peter Zijlstra
2022-04-28 10:07         ` Peter Zijlstra
2022-04-29 21:46       ` [PATCH 0/12] " Eric W. Biederman
2022-04-29 21:46         ` Eric W. Biederman
2022-04-29 21:46         ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 01/12] signal: Rename send_signal send_signal_locked Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-05-02  7:50           ` Sebastian Andrzej Siewior
2022-05-02  7:50             ` Sebastian Andrzej Siewior
2022-05-02  7:50             ` Sebastian Andrzej Siewior
2022-04-29 21:48         ` [PATCH v2 02/12] signal: Replace __group_send_sig_info with send_signal_locked Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-05-02  7:58           ` Sebastian Andrzej Siewior
2022-05-02  7:58             ` Sebastian Andrzej Siewior
2022-05-02  7:58             ` Sebastian Andrzej Siewior
2022-04-29 21:48         ` [PATCH v2 03/12] ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 04/12] ptrace/xtensa: Replace PT_SINGLESTEP " Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 05/12] signal: Use lockdep_assert_held instead of assert_spin_locked Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 06/12] ptrace: Reimplement PTRACE_KILL by always sending SIGKILL Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-05-02 14:37           ` Oleg Nesterov
2022-05-02 14:37             ` Oleg Nesterov
2022-05-02 14:37             ` Oleg Nesterov
2022-05-03 19:36             ` Eric W. Biederman
2022-05-03 19:36               ` Eric W. Biederman
2022-05-03 19:36               ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 07/12] ptrace: Don't change __state Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 22:27           ` Peter Zijlstra
2022-04-29 22:27             ` Peter Zijlstra
2022-04-29 22:27             ` Peter Zijlstra
2022-05-02  8:59           ` Sebastian Andrzej Siewior
2022-05-02  8:59             ` Sebastian Andrzej Siewior
2022-05-02  8:59             ` Sebastian Andrzej Siewior
2022-05-02 15:39           ` Oleg Nesterov
2022-05-02 15:39             ` Oleg Nesterov
2022-05-02 15:39             ` Oleg Nesterov
2022-05-02 16:35             ` Eric W. Biederman
2022-05-02 16:35               ` Eric W. Biederman
2022-05-02 16:35               ` Eric W. Biederman
2022-05-03 13:41               ` Oleg Nesterov
2022-05-03 13:41                 ` Oleg Nesterov
2022-05-03 13:41                 ` Oleg Nesterov
2022-05-03 20:45                 ` Eric W. Biederman
2022-05-03 20:45                   ` Eric W. Biederman
2022-05-03 20:45                   ` Eric W. Biederman
2022-05-04 14:02                   ` Oleg Nesterov
2022-05-04 14:02                     ` Oleg Nesterov
2022-05-04 14:02                     ` Oleg Nesterov
2022-05-04 17:37                     ` Eric W. Biederman
2022-05-04 17:37                       ` Eric W. Biederman
2022-05-04 17:37                       ` Eric W. Biederman
2022-05-04 18:28                       ` Eric W. Biederman
2022-05-04 18:28                         ` Eric W. Biederman
2022-05-04 18:28                         ` Eric W. Biederman
2022-05-02 15:47           ` Oleg Nesterov
2022-05-02 15:47             ` Oleg Nesterov
2022-05-02 15:47             ` Oleg Nesterov
2022-04-29 21:48         ` [PATCH v2 08/12] ptrace: Remove arch_ptrace_attach Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 09/12] ptrace: Always take siglock in ptrace_resume Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 10/12] ptrace: Only return signr from ptrace_stop if it was provided Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-05-02 10:08           ` Sebastian Andrzej Siewior
2022-05-02 10:08             ` Sebastian Andrzej Siewior
2022-05-02 10:08             ` Sebastian Andrzej Siewior
2022-04-29 21:48         ` [PATCH v2 11/12] ptrace: Always call schedule in ptrace_stop Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48         ` [PATCH v2 12/12] sched,signal,ptrace: Rework TASK_TRACED, TASK_STOPPED state Eric W. Biederman
2022-04-29 21:48           ` Eric W. Biederman
2022-04-29 21:48           ` [PATCH v2 12/12] sched, signal, ptrace: " Eric W. Biederman
2022-05-02 10:18           ` [PATCH v2 12/12] sched,signal,ptrace: " Sebastian Andrzej Siewior
2022-05-02 10:18             ` Sebastian Andrzej Siewior
2022-05-02 10:18             ` Sebastian Andrzej Siewior
2022-05-02 13:38         ` [PATCH 0/12] ptrace: cleaning up ptrace_stop Sebastian Andrzej Siewior
2022-05-02 13:38           ` Sebastian Andrzej Siewior
2022-05-02 13:38           ` Sebastian Andrzej Siewior
2022-05-04 22:39         ` [PATCH v3 0/11] " Eric W. Biederman
2022-05-04 22:39           ` Eric W. Biederman
2022-05-04 22:39           ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 01/11] signal: Rename send_signal send_signal_locked Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 02/11] signal: Replace __group_send_sig_info with send_signal_locked Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 03/11] ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 04/11] ptrace/xtensa: Replace PT_SINGLESTEP " Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 05/11] ptrace: Remove arch_ptrace_attach Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 06/11] signal: Use lockdep_assert_held instead of assert_spin_locked Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 07/11] ptrace: Reimplement PTRACE_KILL by always sending SIGKILL Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 08/11] ptrace: Admit ptrace_stop can generate spuriuos SIGTRAPs Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-05 14:57             ` Oleg Nesterov
2022-05-05 14:57               ` Oleg Nesterov
2022-05-05 14:57               ` Oleg Nesterov
2022-05-05 16:59               ` Eric W. Biederman
2022-05-05 16:59                 ` Eric W. Biederman
2022-05-05 16:59                 ` Eric W. Biederman
2022-05-05 15:01             ` Oleg Nesterov
2022-05-05 15:01               ` Oleg Nesterov
2022-05-05 15:01               ` Oleg Nesterov
2022-05-05 17:21               ` Eric W. Biederman
2022-05-05 17:21                 ` Eric W. Biederman
2022-05-05 17:21                 ` Eric W. Biederman
2022-05-05 17:27                 ` Oleg Nesterov
2022-05-05 17:27                   ` Oleg Nesterov
2022-05-05 17:27                   ` Oleg Nesterov
2022-05-05 15:28             ` Oleg Nesterov
2022-05-05 15:28               ` Oleg Nesterov
2022-05-05 15:28               ` Oleg Nesterov
2022-05-05 17:53               ` Eric W. Biederman
2022-05-05 17:53                 ` Eric W. Biederman
2022-05-05 17:53                 ` Eric W. Biederman
2022-05-05 18:10                 ` Oleg Nesterov
2022-05-05 18:10                   ` Oleg Nesterov
2022-05-05 18:10                   ` Oleg Nesterov
2022-05-04 22:40           ` [PATCH v3 09/11] ptrace: Don't change __state Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-05 12:50             ` Sebastian Andrzej Siewior
2022-05-05 12:50               ` Sebastian Andrzej Siewior
2022-05-05 12:50               ` Sebastian Andrzej Siewior
2022-05-05 16:48               ` Eric W. Biederman
2022-05-05 16:48                 ` Eric W. Biederman
2022-05-05 16:48                 ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 10/11] ptrace: Always take siglock in ptrace_resume Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40           ` [PATCH v3 11/11] sched,signal,ptrace: Rework TASK_TRACED, TASK_STOPPED state Eric W. Biederman
2022-05-04 22:40             ` Eric W. Biederman
2022-05-04 22:40             ` [PATCH v3 11/11] sched, signal, ptrace: " Eric W. Biederman
2022-05-05 18:25           ` [PATCH v4 0/12] ptrace: cleaning up ptrace_stop Eric W. Biederman
2022-05-05 18:25             ` Eric W. Biederman
2022-05-05 18:25             ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 01/12] signal: Rename send_signal send_signal_locked Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 02/12] signal: Replace __group_send_sig_info with send_signal_locked Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 03/12] ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 04/12] ptrace/xtensa: Replace PT_SINGLESTEP " Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 05/12] ptrace: Remove arch_ptrace_attach Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 06/12] signal: Use lockdep_assert_held instead of assert_spin_locked Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 07/12] ptrace: Reimplement PTRACE_KILL by always sending SIGKILL Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 08/12] ptrace: Document that wait_task_inactive can't fail Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-06  6:55               ` Sebastian Andrzej Siewior
2022-05-06  6:55                 ` Sebastian Andrzej Siewior
2022-05-06  6:55                 ` Sebastian Andrzej Siewior
2022-05-05 18:26             ` [PATCH v4 09/12] ptrace: Admit ptrace_stop can generate spuriuos SIGTRAPs Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 10/12] ptrace: Don't change __state Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-06 15:09               ` Oleg Nesterov
2022-05-06 15:09                 ` Oleg Nesterov
2022-05-06 15:09                 ` Oleg Nesterov
2022-05-06 19:42                 ` Eric W. Biederman
2022-05-06 19:42                   ` Eric W. Biederman
2022-05-06 19:42                   ` Eric W. Biederman
2022-05-10 14:23               ` Oleg Nesterov
2022-05-10 14:23                 ` Oleg Nesterov
2022-05-10 14:23                 ` Oleg Nesterov
2022-05-10 15:17                 ` Eric W. Biederman
2022-05-10 15:17                   ` Eric W. Biederman
2022-05-10 15:17                   ` Eric W. Biederman
2022-05-10 15:34                   ` Oleg Nesterov
2022-05-10 15:34                     ` Oleg Nesterov
2022-05-10 15:34                     ` Oleg Nesterov
2022-05-05 18:26             ` [PATCH v4 11/12] ptrace: Always take siglock in ptrace_resume Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26             ` [PATCH v4 12/12] sched,signal,ptrace: Rework TASK_TRACED, TASK_STOPPED state Eric W. Biederman
2022-05-05 18:26               ` Eric W. Biederman
2022-05-05 18:26               ` [PATCH v4 12/12] sched, signal, ptrace: " Eric W. Biederman
2022-06-21 13:00               ` [PATCH v4 12/12] sched,signal,ptrace: " Alexander Gordeev
2022-06-21 13:00                 ` Alexander Gordeev
2022-06-21 13:00                 ` Alexander Gordeev
2022-06-21 14:02                 ` Eric W. Biederman
2022-06-21 14:02                   ` Eric W. Biederman
2022-06-21 15:15                   ` Alexander Gordeev
2022-06-21 15:15                     ` Alexander Gordeev
2022-06-21 15:15                     ` Alexander Gordeev
2022-06-21 17:47                     ` Eric W. Biederman
2022-06-21 17:47                       ` Eric W. Biederman
2022-06-21 17:47                       ` Eric W. Biederman
2022-06-25 16:34                     ` Eric W. Biederman
2022-06-25 16:34                       ` Eric W. Biederman
2022-06-25 16:34                       ` Eric W. Biederman
2022-06-28 18:36                       ` Alexander Gordeev
2022-06-28 18:36                         ` Alexander Gordeev
2022-06-28 18:36                         ` Alexander Gordeev
2022-06-28 22:42                         ` Eric W. Biederman
2022-06-28 22:42                           ` Eric W. Biederman
2022-06-28 22:48                           ` Steven Rostedt
2022-06-28 22:48                             ` Steven Rostedt
2022-06-29  3:39                             ` Eric W. Biederman
2022-06-29  3:39                               ` Eric W. Biederman
2022-06-29  3:39                               ` Eric W. Biederman
2022-06-29 20:25                               ` Alexander Gordeev
2022-06-29 20:25                                 ` Alexander Gordeev
2022-06-29 20:25                                 ` Alexander Gordeev
2022-07-05 15:44                               ` Peter Zijlstra
2022-07-05 15:44                                 ` Peter Zijlstra
2022-07-05 15:44                                 ` Peter Zijlstra
2022-07-06  6:56                                 ` Alexander Gordeev
2022-07-06  6:56                                   ` Alexander Gordeev
2022-07-06  6:56                                   ` Alexander Gordeev
2022-06-28 23:15                     ` Steven Rostedt
2022-06-28 23:15                       ` Steven Rostedt
2022-06-28 23:15                       ` Steven Rostedt
2022-07-05 13:47                       ` Sven Schnelle
2022-07-05 13:47                         ` Sven Schnelle
2022-07-05 13:47                         ` Sven Schnelle
2022-07-05 17:28                         ` Sven Schnelle
2022-07-05 17:28                           ` Sven Schnelle
2022-07-05 17:28                           ` Sven Schnelle
2022-07-05 19:25                           ` Peter Zijlstra
2022-07-05 19:25                             ` Peter Zijlstra
2022-07-05 19:25                             ` Peter Zijlstra
2022-07-06  7:58                             ` Sven Schnelle
2022-07-06  7:58                               ` Sven Schnelle
2022-07-06  7:58                               ` Sven Schnelle
2022-07-06  8:59                               ` Peter Zijlstra
2022-07-06  8:59                                 ` Peter Zijlstra
2022-07-06  8:59                                 ` Peter Zijlstra
2022-07-06  9:27                                 ` Sven Schnelle
2022-07-06  9:27                                   ` Sven Schnelle
2022-07-06  9:27                                   ` Sven Schnelle
2022-07-06 10:11                                   ` Peter Zijlstra
2022-07-06 10:11                                     ` Peter Zijlstra
2022-05-06 14:14             ` [PATCH v4 0/12] ptrace: cleaning up ptrace_stop Oleg Nesterov
2022-05-06 14:14               ` Oleg Nesterov
2022-05-06 14:14               ` Oleg Nesterov
2022-05-06 14:38               ` Eric W. Biederman
2022-05-06 14:38                 ` Eric W. Biederman
2022-05-06 14:38                 ` Eric W. Biederman
2022-05-06 21:26             ` Kees Cook
2022-05-06 21:26               ` Kees Cook
2022-05-06 21:59               ` Eric W. Biederman
2022-05-06 21:59                 ` Eric W. Biederman
2022-05-06 21:59                 ` Eric W. Biederman
2022-05-10 14:11             ` Oleg Nesterov
2022-05-10 14:11               ` Oleg Nesterov
2022-05-10 14:11               ` Oleg Nesterov
2022-05-10 14:26               ` Eric W. Biederman
2022-05-10 14:26                 ` Eric W. Biederman
2022-05-10 14:26                 ` Eric W. Biederman
2022-05-10 14:45                 ` Sebastian Andrzej Siewior
2022-05-10 14:45                   ` Sebastian Andrzej Siewior
2022-05-10 14:45                   ` Sebastian Andrzej Siewior
2022-05-10 15:18                   ` Eric W. Biederman
2022-05-10 15:18                     ` Eric W. Biederman
2022-05-10 15:18                     ` Eric W. Biederman
2022-05-11 20:00                 ` Eric W. Biederman
2022-05-11 20:00                   ` Eric W. Biederman
2022-05-11 20:00                   ` Eric W. Biederman
2022-05-18 22:49             ` [PATCH 00/16] ptrace: cleanups and calling do_cldstop with only siglock Eric W. Biederman
2022-05-18 22:49               ` Eric W. Biederman
2022-05-18 22:49               ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 01/16] signal/alpha: Remove unused definition of TASK_REAL_PARENT Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 02/16] signal/ia64: Remove unused definition of IA64_TASK_REAL_PARENT_OFFSET Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 03/16] kdb: Use real_parent when displaying a list of processes Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-19  7:56                 ` Peter Zijlstra
2022-05-19  7:56                   ` Peter Zijlstra
2022-05-19  7:56                   ` Peter Zijlstra
2022-05-19 18:06                   ` Eric W. Biederman
2022-05-19 18:06                     ` Eric W. Biederman
2022-05-19 18:06                     ` Eric W. Biederman
2022-05-19 20:52                 ` Doug Anderson
2022-05-19 20:52                   ` Doug Anderson
2022-05-19 20:52                   ` Doug Anderson
2022-05-19 23:48                   ` Eric W. Biederman
2022-05-19 23:48                     ` Eric W. Biederman
2022-05-19 23:48                     ` Eric W. Biederman
2022-05-20 23:01                     ` Doug Anderson
2022-05-20 23:01                       ` Doug Anderson
2022-05-20 23:01                       ` Doug Anderson
2022-05-18 22:53               ` [PATCH 04/16] powerpc/xmon: " Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 05/16] ptrace: Remove dead code from __ptrace_detach Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-24 11:42                 ` Oleg Nesterov
2022-05-24 11:42                   ` Oleg Nesterov
2022-05-24 11:42                   ` Oleg Nesterov
2022-05-25 14:33                   ` Oleg Nesterov
2022-05-25 14:33                     ` Oleg Nesterov
2022-05-25 14:33                     ` Oleg Nesterov
2022-06-06 16:06                     ` Eric W. Biederman
2022-06-06 16:06                       ` Eric W. Biederman
2022-06-06 16:06                       ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 06/16] ptrace: Remove unnecessary locking in ptrace_(get|set)siginfo Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-24 13:25                 ` Oleg Nesterov
2022-05-24 13:25                   ` Oleg Nesterov
2022-05-24 13:25                   ` Oleg Nesterov
2022-05-18 22:53               ` [PATCH 07/16] signal: Wake up the designated parent Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-24 13:25                 ` Oleg Nesterov
2022-05-24 13:25                   ` Oleg Nesterov
2022-05-24 13:25                   ` Oleg Nesterov
2022-05-24 16:28                   ` Oleg Nesterov
2022-05-24 16:28                     ` Oleg Nesterov
2022-05-24 16:28                     ` Oleg Nesterov
2022-05-25 14:28                     ` Oleg Nesterov
2022-05-25 14:28                       ` Oleg Nesterov
2022-05-25 14:28                       ` Oleg Nesterov
2022-06-06 22:10                       ` Eric W. Biederman
2022-06-06 22:10                         ` Eric W. Biederman
2022-06-06 22:10                         ` Eric W. Biederman
2022-06-07 15:26                         ` Oleg Nesterov
2022-06-07 15:26                           ` Oleg Nesterov
2022-06-07 15:26                           ` Oleg Nesterov
2022-05-18 22:53               ` [PATCH 08/16] ptrace: Only populate last_siginfo from ptrace Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-24 15:27                 ` Oleg Nesterov
2022-05-24 15:27                   ` Oleg Nesterov
2022-05-24 15:27                   ` Oleg Nesterov
2022-06-06 22:16                   ` Eric W. Biederman
2022-06-06 22:16                     ` Eric W. Biederman
2022-06-06 22:16                     ` Eric W. Biederman
2022-06-07 15:29                     ` Oleg Nesterov
2022-06-07 15:29                       ` Oleg Nesterov
2022-06-07 15:29                       ` Oleg Nesterov
2022-05-18 22:53               ` [PATCH 09/16] ptrace: In ptrace_setsiginfo deal with invalid si_signo Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 10/16] ptrace: In ptrace_signal look at what the debugger did with siginfo Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 11/16] ptrace: Use si_sino as the signal number to resume with Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 12/16] ptrace: Stop protecting ptrace_set_signr with tasklist_lock Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 13/16] ptrace: Document why ptrace_setoptions does not need a lock Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 14/16] signal: Protect parent child relationships by childs siglock Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 15/16] ptrace: Use siglock instead of tasklist_lock in ptrace_check_attach Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53               ` [PATCH 16/16] signal: Always call do_notify_parent_cldstop with siglock held Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-18 22:53                 ` Eric W. Biederman
2022-05-20 16:19                 ` kernel test robot
2022-05-20 16:19                   ` kernel test robot
2022-05-20 16:19                   ` kernel test robot
     [not found]               ` <CALWUPBdFDLuT7JaNGSJ_UXbHf8y9uKdC-SkAqzd=FQC0MX4nNQ@mail.gmail.com>
2022-05-19  6:19                 ` [PATCH 00/16] ptrace: cleanups and calling do_cldstop with only siglock Sebastian Andrzej Siewior
2022-05-19  6:19                   ` Sebastian Andrzej Siewior
2022-05-19  6:19                   ` Sebastian Andrzej Siewior
2022-05-19 18:05                   ` Eric W. Biederman
2022-05-19 18:05                     ` Eric W. Biederman
2022-05-19 18:05                     ` Eric W. Biederman
2022-05-20  5:24                     ` Kyle Huey
2022-05-20  5:24                       ` Kyle Huey
2022-05-20  5:24                       ` Kyle Huey
2022-06-06 16:12                       ` Eric W. Biederman
2022-06-06 16:12                         ` Eric W. Biederman
2022-06-09 19:59                         ` Kyle Huey
2022-06-09 19:59                           ` Kyle Huey
2022-06-09 19:59                           ` Kyle Huey
2022-05-20  7:33               ` Sebastian Andrzej Siewior
2022-05-20  7:33                 ` Sebastian Andrzej Siewior
2022-05-20  7:33                 ` Sebastian Andrzej Siewior
2022-05-20 19:32                 ` Eric W. Biederman
2022-05-20 19:32                   ` Eric W. Biederman
2022-05-20 19:32                   ` Eric W. Biederman
2022-05-20 19:58                   ` Peter Zijlstra
2022-05-20 19:58                     ` Peter Zijlstra
2022-05-20 19:58                     ` Peter Zijlstra
2022-05-20  9:19               ` Sebastian Andrzej Siewior
2022-05-20  9:19                 ` Sebastian Andrzej Siewior
2022-05-20  9:19                 ` Sebastian Andrzej Siewior
2022-06-22 16:43             ` [PATCH 0/3] ptrace: Stop supporting SIGKILL for PTRACE_EVENT_EXIT Eric W. Biederman
2022-06-22 16:45               ` [PATCH 1/3] signal: Ensure SIGNAL_GROUP_EXIT gets set in do_group_exit Eric W. Biederman
2022-06-22 16:46               ` [PATCH 2/3] signal: Guarantee that SIGNAL_GROUP_EXIT is set on process exit Eric W. Biederman
2022-06-23  7:49                 ` kernel test robot
2022-06-22 16:47               ` [PATCH 3/3] signal: Drop signals received after a fatal signal has been processed Eric W. Biederman
2022-06-23 15:12               ` [PATCH 0/3] ptrace: Stop supporting SIGKILL for PTRACE_EVENT_EXIT Alexander Gordeev
2022-06-23 21:55                 ` Eric W. Biederman
2022-07-08 22:25               ` Eric W. Biederman
2022-07-08 23:22                 ` Keno Fischer
2022-07-12 20:03                   ` Eric W. Biederman
2022-07-16 21:29                     ` Eric W. Biederman
2022-07-16 23:21                       ` Kyle Huey
2022-04-25 14:35   ` [PATCH v2 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT_RT Oleg Nesterov
2022-04-25 18:33     ` Peter Zijlstra
2022-04-26  0:38       ` Eric W. Biederman
2022-04-26  5:51         ` Oleg Nesterov
2022-04-26 17:19           ` Eric W. Biederman
2022-04-26 18:11             ` Oleg Nesterov
2022-04-25 17:47   ` Oleg Nesterov
2022-04-27  0:24     ` Eric W. Biederman
2022-04-28 20:29       ` Peter Zijlstra
2022-04-28 20:59         ` Oleg Nesterov
2022-04-28 22:21           ` Peter Zijlstra
2022-04-28 22:50             ` Oleg Nesterov
2022-04-27 15:53   ` Oleg Nesterov
2022-04-27 21:57     ` Eric W. Biederman
2022-04-21 15:02 ` [PATCH v2 3/5] freezer: Have {,un}lock_system_sleep() save/restore flags Peter Zijlstra
2022-04-21 15:02 ` [PATCH v2 4/5] freezer,umh: Clean up freezer/initrd interaction Peter Zijlstra
2022-04-21 15:02 ` [PATCH v2 5/5] freezer,sched: Rewrite core freezer logic Peter Zijlstra
2022-04-21 17:26   ` Eric W. Biederman
2022-04-21 17:57     ` Oleg Nesterov
2022-04-21 19:55     ` Peter Zijlstra
2022-04-21 20:07       ` Peter Zijlstra
2022-04-22 15:52         ` Eric W. Biederman
2022-04-22 17:43 ` [PATCH v2 0/5] ptrace-vs-PREEMPT_RT and freezer rewrite Sebastian Andrzej Siewior
2022-04-22 19:15   ` Eric W. Biederman
2022-04-22 21:13     ` Sebastian Andrzej Siewior

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