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From: Oleg Nesterov <oleg@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: roland@redhat.com, jan.kratochvil@redhat.com,
	vda.linux@googlemail.com, linux-kernel@vger.kernel.org,
	torvalds@linux-foundation.org, akpm@linux-foundation.org,
	indan@nul.nu
Subject: Re: [PATCH 3/8] job control: Fix ptracer wait(2) hang and explain notask_error clearing
Date: Mon, 21 Mar 2011 17:09:03 +0100	[thread overview]
Message-ID: <20110321160903.GA26520@redhat.com> (raw)
In-Reply-To: <20110321151941.GA20917@redhat.com>

On 03/21, Oleg Nesterov wrote:
>
> On 03/08, Tejun Heo wrote:
> >
> > +		if (likely(!ptrace) || (wo->wo_flags & WCONTINUED))
> > +			wo->notask_error = 0;
>
> I don't understand this part. Suppose that this task is not traced and
> its real parent does do_wait(WEXITED). We shouldn't return -ECHLD in
> this case (EXIT_ZOMBIE && delay_group_leader()).

Argh. please ingnore this part. I misread the code above.

> If the task is traced and debugger does do_wait(WEXITED) we should not
> return -ECHLD too.

Still true, or I missed something again...

Oleg.


  reply	other threads:[~2011-03-21 16:18 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-08 19:56 [RFC PATCHSET] ptrace,signal: Fix notifications to the real parent while ptraced Tejun Heo
2011-03-08 19:56 ` [PATCH 1/8] job control: Don't set group_stop exit_code if re-entering job control stop Tejun Heo
2011-03-21 13:20   ` Oleg Nesterov
2011-03-21 15:52     ` Tejun Heo
2011-03-22 18:44       ` Oleg Nesterov
2011-03-23  8:44         ` Tejun Heo
2011-03-23 16:40           ` Oleg Nesterov
2011-03-23 17:02             ` Tejun Heo
2011-03-23 17:09               ` Oleg Nesterov
2011-03-23 17:22                 ` Tejun Heo
2011-03-08 19:56 ` [PATCH 2/8] job control: Small reorganization of wait_consider_task() Tejun Heo
2011-03-08 19:56 ` [PATCH 3/8] job control: Fix ptracer wait(2) hang and explain notask_error clearing Tejun Heo
2011-03-21 15:19   ` Oleg Nesterov
2011-03-21 16:09     ` Oleg Nesterov [this message]
2011-03-21 16:12     ` Tejun Heo
2011-03-22 19:08       ` Oleg Nesterov
2011-03-22 10:51   ` [PATCH UPDATED " Tejun Heo
2011-03-08 19:56 ` [PATCH 4/8] job control: Allow access to job control events through ptracees Tejun Heo
2011-03-21 16:39   ` Oleg Nesterov
2011-03-21 17:20     ` Tejun Heo
2011-03-22 11:10   ` [PATCH UPDATED " Tejun Heo
2011-03-08 19:56 ` [PATCH 5/8] job control: Add @for_ptrace to do_notify_parent_cldstop() Tejun Heo
2011-03-08 19:56 ` [PATCH 6/8] job control: Job control stop notifications should always go to the real parent Tejun Heo
2011-03-21 17:12   ` Oleg Nesterov
2011-03-08 19:56 ` [PATCH 7/8] job control: Notify the real parent of job control events regardless of ptrace Tejun Heo
2011-03-21 17:43   ` Oleg Nesterov
2011-03-22  8:04     ` Tejun Heo
2011-03-22 19:44       ` Oleg Nesterov
2011-03-23  9:17         ` Tejun Heo
2011-03-23  9:24           ` Tejun Heo
2011-03-23 16:46             ` Oleg Nesterov
2011-03-23 16:59               ` Tejun Heo
2011-03-23 17:07                 ` Oleg Nesterov
2011-03-23 17:20                   ` Tejun Heo
2011-03-23 17:17                     ` Oleg Nesterov
2011-03-22 11:30   ` [PATCH UPDATED " Tejun Heo
2011-03-08 19:56 ` [PATCH 8/8] job control: Don't send duplicate job control stop notification while ptraced Tejun Heo
2011-03-21 17:48   ` Oleg Nesterov
2011-03-08 20:01 ` [RFC PATCHSET] ptrace,signal: Fix notifications to the real parent " Linus Torvalds
2011-03-09 16:50 ` Oleg Nesterov
2011-03-22 10:20 ` [PATCH 0.1/8] ptrace: Collapse ptrace_untrace() into __ptrace_unlink() Tejun Heo
2011-03-22 10:20 ` [PATCH 0.2/8] ptrace: Always put ptracee into appropriate execution state Tejun Heo
2011-03-22 20:33   ` Oleg Nesterov
2011-03-23  8:00     ` Tejun Heo
2011-03-22 13:11 ` [RFC PATCHSET] ptrace,signal: Fix notifications to the real parent while ptraced Tejun Heo
2011-03-22 20:59   ` Oleg Nesterov
2011-03-23  8:48     ` Tejun Heo

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