From: Oleg Nesterov <oleg@redhat.com>
To: Tejun Heo <tj@kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: containers@lists.linux-foundation.org, paul@paulmenage.org,
linux-kernel@vger.kernel.org,
linux-pm@lists.linux-foundation.org
Subject: [PATCH 0/1] freezer: fix wait_event_freezable/__thaw_task races
Date: Wed, 7 Sep 2011 20:21:56 +0200 [thread overview]
Message-ID: <20110907182156.GA13909__4530.81095261059$1315420074$gmane$org@redhat.com> (raw)
In-Reply-To: <20110906155332.GF18425@mtj.dyndns.org>
Hi,
On 09/07, Tejun Heo wrote:
> >
> > I meant, unless the caller plays with allow_signal(), it has all rights to do
> >
> > if (wait_event_freezable(...))
> > BUG();
> >
> > This becomes correct with the code above.
>
> Yeap, sure, w/ freezable_with_signal gone, the above should work fine.
> Care to create a patch?
Sure.
But. Tejun, Rafael, I have to rely on your review. I have no idea how
can I test this change. Hopfully it is simple enough, though.
And. wait_event_freezable_timeout() obviously has another problem,
although I hope this is fine. The caller can spend a lot of time in
refrigerator, shouldn't we update "timeout" in this case? I hope we
shouldn't.
Oleg.
next prev parent reply other threads:[~2011-09-07 18:21 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-02 18:27 [PATCHSET pm-freezer] freezer: fixes & simplifications Tejun Heo
2011-09-02 18:27 ` [PATCH 1/6] cgroup_freezer: fix freezer->state setting bug in freezer_change_state() Tejun Heo
2011-09-04 18:02 ` Oleg Nesterov
[not found] ` <1314988070-12244-2-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2011-09-04 18:02 ` Oleg Nesterov
2011-09-04 18:02 ` Oleg Nesterov
2011-09-04 18:11 ` Tejun Heo
[not found] ` <20110904180206.GA28520-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-04 18:11 ` Tejun Heo
2011-09-04 18:11 ` Tejun Heo
[not found] ` <20110904181139.GA9807-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-09-04 18:20 ` Oleg Nesterov
2011-09-04 18:20 ` Oleg Nesterov
2011-09-04 18:20 ` Oleg Nesterov
2011-09-02 18:27 ` Tejun Heo
2011-09-02 18:27 ` [PATCH 2/6] freezer: set PF_NOFREEZE on a dying task right before TASK_DEAD " Tejun Heo
2011-09-02 18:27 ` Tejun Heo
2011-09-02 18:27 ` [PATCH 3/6] freezer: restructure __refrigerator() Tejun Heo
2011-09-02 18:27 ` Tejun Heo
2011-09-02 18:27 ` [PATCH 4/6] freezer: use lock_task_sighand() in fake_signal_wake_up() Tejun Heo
2011-09-02 18:27 ` Tejun Heo
2011-09-02 18:27 ` [PATCH 5/6] freezer: remove unused @sig_only from freeze_task() Tejun Heo
2011-09-02 18:27 ` Tejun Heo
[not found] ` <1314988070-12244-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2011-09-02 18:27 ` [PATCH 1/6] cgroup_freezer: fix freezer->state setting bug in freezer_change_state() Tejun Heo
2011-09-02 18:27 ` [PATCH 2/6] freezer: set PF_NOFREEZE on a dying task right before TASK_DEAD " Tejun Heo
2011-09-02 18:27 ` [PATCH 3/6] freezer: restructure __refrigerator() Tejun Heo
2011-09-02 18:27 ` [PATCH 4/6] freezer: use lock_task_sighand() in fake_signal_wake_up() Tejun Heo
2011-09-02 18:27 ` [PATCH 5/6] freezer: remove unused @sig_only from freeze_task() Tejun Heo
2011-09-02 18:27 ` [PATCH 6/6] freezer: kill unused set_freezable_with_signal() Tejun Heo
2011-09-04 18:48 ` [PATCHSET pm-freezer] freezer: fixes & simplifications Oleg Nesterov
2011-09-04 18:48 ` Oleg Nesterov
2011-09-02 18:27 ` [PATCH 6/6] freezer: kill unused set_freezable_with_signal() Tejun Heo
[not found] ` <1314988070-12244-7-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2011-09-04 18:46 ` Oleg Nesterov
2011-09-04 18:46 ` Oleg Nesterov
2011-09-05 2:33 ` Tejun Heo
2011-09-05 2:33 ` Tejun Heo
2011-09-05 2:35 ` Tejun Heo
2011-09-05 2:35 ` Tejun Heo
2011-09-05 16:21 ` Oleg Nesterov
2011-09-05 16:21 ` Oleg Nesterov
[not found] ` <20110905023505.GC9807-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-09-05 16:21 ` Oleg Nesterov
2011-09-05 16:20 ` Oleg Nesterov
2011-09-05 16:20 ` Oleg Nesterov
2011-09-06 3:28 ` Tejun Heo
2011-09-06 3:28 ` Tejun Heo
2011-09-06 15:18 ` Oleg Nesterov
2011-09-06 15:18 ` Oleg Nesterov
2011-09-06 15:25 ` Oleg Nesterov
[not found] ` <20110906151836.GA15568-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-06 15:25 ` Oleg Nesterov
2011-09-06 15:25 ` Oleg Nesterov
2011-09-06 15:53 ` Tejun Heo
2011-09-06 15:53 ` Tejun Heo
2011-09-07 18:21 ` Oleg Nesterov [this message]
2011-09-07 18:21 ` [PATCH 0/1] freezer: fix wait_event_freezable/__thaw_task races Oleg Nesterov
2011-09-07 18:22 ` [PATCH 1/1] " Oleg Nesterov
2011-09-07 18:22 ` Oleg Nesterov
[not found] ` <20110907182217.GB13909-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-08 1:05 ` Tejun Heo
2011-09-08 1:05 ` Tejun Heo
2011-09-08 17:59 ` Oleg Nesterov
[not found] ` <20110908010530.GD3987-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-09-08 17:59 ` Oleg Nesterov
2011-09-08 17:59 ` Oleg Nesterov
2011-09-11 1:54 ` Tejun Heo
[not found] ` <20110908175926.GA26986-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-11 1:54 ` Tejun Heo
2011-09-11 1:54 ` Tejun Heo
2011-09-11 18:29 ` Oleg Nesterov
2011-09-11 18:41 ` Oleg Nesterov
2011-09-08 1:05 ` Tejun Heo
[not found] ` <20110907182156.GA13909-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-07 18:22 ` Oleg Nesterov
[not found] ` <20110906155332.GF18425-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-09-07 18:21 ` [PATCH 0/1] " Oleg Nesterov
[not found] ` <20110906152539.GA16899-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-06 15:53 ` [PATCH 6/6] freezer: kill unused set_freezable_with_signal() Tejun Heo
2011-09-08 18:01 ` Matt Helsley
[not found] ` <20110906032846.GA18425-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-09-06 15:18 ` Oleg Nesterov
2011-09-08 18:01 ` Matt Helsley
2011-09-08 18:01 ` Matt Helsley
[not found] ` <20110908180159.GA4197-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-09-11 1:37 ` Tejun Heo
2011-09-11 1:37 ` Tejun Heo
2011-09-11 1:37 ` Tejun Heo
[not found] ` <20110905162012.GA4445-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-06 3:28 ` Tejun Heo
[not found] ` <20110905023315.GB9807-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-09-05 2:35 ` Tejun Heo
2011-09-05 16:20 ` Oleg Nesterov
[not found] ` <20110904184626.GA30101-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-09-05 2:33 ` Tejun Heo
2011-09-04 18:46 ` Oleg Nesterov
2011-09-02 18:27 ` Tejun Heo
2011-09-04 18:48 ` [PATCHSET pm-freezer] freezer: fixes & simplifications Oleg Nesterov
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