From: Oleg Nesterov <oleg@redhat.com>
To: "Andrey Grodzovsky" <Andrey.Grodzovsky@amd.com>,
"Michel Dänzer" <michel@daenzer.net>,
linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, David.Panariti@amd.com,
ebiederm@xmission.com, Alexander.Deucher@amd.com,
akpm@linux-foundation.org, Christian.Koenig@amd.com
Subject: Re: [PATCH 2/3] drm/scheduler: Don't call wait_event_killable for signaled process.
Date: Wed, 25 Apr 2018 15:22:28 +0200 [thread overview]
Message-ID: <20180425132228.GC7592@redhat.com> (raw)
In-Reply-To: <20180424214027.GG25142@phenom.ffwll.local>
On 04/24, Daniel Vetter wrote:
>
> wait_event_killabel doesn't check for fatal_signal_pending before calling
> schedule, so definitely has a nice race there.
This is fine. See the signal_pending_state() check in __schedule().
And this doesn't differ from wait_event_interruptible(), it too doesn't
check signal_pending(), we rely on schedule() which must not block if the
caller is signalled/killed.
The problem is that it is not clear what should fatal_signal_pending() or
even signal_pending() mean after exit_signals().
Oleg.
next prev parent reply other threads:[~2018-04-25 13:22 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-24 15:30 Avoid uninterruptible sleep during process exit Andrey Grodzovsky
2018-04-24 15:30 ` Andrey Grodzovsky
2018-04-24 15:30 ` [PATCH 1/3] signals: Allow generation of SIGKILL to exiting task Andrey Grodzovsky
2018-04-24 15:30 ` Andrey Grodzovsky
2018-04-24 16:10 ` Eric W. Biederman
2018-04-24 16:10 ` Eric W. Biederman
2018-04-24 16:42 ` Eric W. Biederman
2018-04-24 16:42 ` Eric W. Biederman
2018-04-24 16:51 ` Andrey Grodzovsky
2018-04-24 16:51 ` Andrey Grodzovsky
2018-04-24 17:29 ` Eric W. Biederman
2018-04-25 13:13 ` Oleg Nesterov
2018-04-24 15:30 ` [PATCH 2/3] drm/scheduler: Don't call wait_event_killable for signaled process Andrey Grodzovsky
2018-04-24 15:30 ` Andrey Grodzovsky
2018-04-24 15:46 ` Michel Dänzer
2018-04-24 15:51 ` Andrey Grodzovsky
2018-04-24 15:51 ` Andrey Grodzovsky
2018-04-24 15:52 ` Andrey Grodzovsky
2018-04-24 15:52 ` Andrey Grodzovsky
2018-04-24 19:44 ` Daniel Vetter
2018-04-24 19:44 ` Daniel Vetter
2018-04-24 21:00 ` Eric W. Biederman
2018-04-24 21:02 ` Andrey Grodzovsky
2018-04-24 21:02 ` Andrey Grodzovsky
2018-04-24 21:21 ` Eric W. Biederman
2018-04-24 21:37 ` Andrey Grodzovsky
2018-04-24 21:37 ` Andrey Grodzovsky
2018-04-24 22:11 ` Eric W. Biederman
2018-04-25 7:14 ` Daniel Vetter
2018-04-25 13:08 ` Andrey Grodzovsky
2018-04-25 13:08 ` Andrey Grodzovsky
2018-04-25 15:29 ` Eric W. Biederman
2018-04-25 16:13 ` Andrey Grodzovsky
2018-04-25 16:31 ` Eric W. Biederman
2018-04-24 21:40 ` Daniel Vetter
2018-04-24 21:40 ` Daniel Vetter
2018-04-25 13:22 ` Oleg Nesterov [this message]
2018-04-25 13:36 ` Daniel Vetter
2018-04-25 14:18 ` Oleg Nesterov
2018-04-25 14:18 ` Oleg Nesterov
2018-04-25 13:43 ` Andrey Grodzovsky
2018-04-25 13:43 ` Andrey Grodzovsky
2018-04-24 16:23 ` Eric W. Biederman
2018-04-24 16:23 ` Eric W. Biederman
2018-04-24 16:43 ` Andrey Grodzovsky
2018-04-24 16:43 ` Andrey Grodzovsky
2018-04-24 17:12 ` Eric W. Biederman
2018-04-25 13:55 ` Oleg Nesterov
2018-04-25 14:21 ` Andrey Grodzovsky
2018-04-25 14:21 ` Andrey Grodzovsky
2018-04-25 17:17 ` Oleg Nesterov
2018-04-25 18:40 ` Andrey Grodzovsky
2018-04-25 18:40 ` Andrey Grodzovsky
2018-04-26 0:01 ` Eric W. Biederman
2018-04-26 12:34 ` Andrey Grodzovsky
2018-04-26 12:34 ` Andrey Grodzovsky
2018-04-26 12:52 ` Andrey Grodzovsky
2018-04-26 12:52 ` Andrey Grodzovsky
2018-04-26 15:57 ` Eric W. Biederman
2018-04-26 20:43 ` Andrey Grodzovsky
2018-04-26 20:43 ` Andrey Grodzovsky
2018-04-30 12:08 ` Christian König
2018-04-30 12:08 ` Christian König
2018-04-30 14:32 ` Andrey Grodzovsky
2018-04-30 14:32 ` Andrey Grodzovsky
2018-04-30 15:25 ` Christian König
2018-04-30 15:25 ` Christian König
2018-04-30 16:00 ` Oleg Nesterov
2018-04-30 16:10 ` Andrey Grodzovsky
2018-04-30 16:10 ` Andrey Grodzovsky
2018-04-30 18:29 ` Christian König
2018-04-30 18:29 ` Christian König
2018-04-30 19:28 ` Andrey Grodzovsky
2018-04-30 19:28 ` Andrey Grodzovsky
2018-05-02 11:48 ` Christian König
2018-05-02 11:48 ` Christian König
2018-05-17 11:18 ` Andrey Grodzovsky
2018-05-17 14:48 ` Michel Dänzer
2018-05-17 15:33 ` Andrey Grodzovsky
2018-05-17 15:52 ` Michel Dänzer
2018-05-17 19:05 ` Andrey Grodzovsky
2018-05-18 8:46 ` Michel Dänzer
2018-05-18 9:42 ` Christian König
2018-05-18 14:44 ` Michel Dänzer
2018-05-18 14:50 ` Christian König
2018-05-18 15:02 ` Andrey Grodzovsky
2018-05-22 12:58 ` Christian König
2018-05-22 15:49 ` Andrey Grodzovsky
2018-05-22 16:09 ` Michel Dänzer
2018-05-22 16:30 ` Andrey Grodzovsky
2018-05-22 16:33 ` Michel Dänzer
2018-05-22 16:37 ` Andrey Grodzovsky
2018-05-01 14:35 ` Oleg Nesterov
2018-05-23 15:08 ` Andrey Grodzovsky
2018-05-23 15:08 ` Andrey Grodzovsky
2018-04-30 15:29 ` Oleg Nesterov
2018-04-30 16:25 ` Eric W. Biederman
2018-04-30 17:18 ` Andrey Grodzovsky
2018-04-30 17:18 ` Andrey Grodzovsky
2018-04-25 13:05 ` Oleg Nesterov
2018-04-24 15:30 ` [PATCH 3/3] drm/amdgpu: Switch to interrupted wait to recover from ring hang Andrey Grodzovsky
2018-04-24 15:30 ` Andrey Grodzovsky
2018-04-24 15:52 ` Panariti, David
2018-04-24 15:52 ` Panariti, David
2018-04-24 15:58 ` Andrey Grodzovsky
2018-04-24 15:58 ` Andrey Grodzovsky
2018-04-24 16:20 ` Panariti, David
2018-04-24 16:20 ` Panariti, David
2018-04-24 16:30 ` Eric W. Biederman
2018-04-24 16:30 ` Eric W. Biederman
2018-04-25 17:17 ` Andrey Grodzovsky
2018-04-25 17:17 ` Andrey Grodzovsky
2018-04-25 20:55 ` Eric W. Biederman
2018-04-25 20:55 ` Eric W. Biederman
2018-04-26 12:28 ` Andrey Grodzovsky
2018-04-26 12:28 ` Andrey Grodzovsky
2018-04-24 16:14 ` Eric W. Biederman
2018-04-24 16:14 ` Eric W. Biederman
2018-04-24 16:38 ` Andrey Grodzovsky
2018-04-24 16:38 ` Andrey Grodzovsky
2018-04-30 11:34 ` Christian König
2018-04-30 11:34 ` Christian König
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