linux-kernel - [PATCH v3 0/2] fix task_work interation with freezing

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Message-ID: <cover.1720634146.git.asml.silence@gmail.com>
Date: Wed, 10 Jul 2024 18:58:16 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: io-uring@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
	asml.silence@...il.com,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	Tycho Andersen <tandersen@...flix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Julian Orth <ju.orth@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH v3 0/2] fix task_work interation with freezing

It's reported [1] that a task_work queued at a wrong time can prevent
freezing and make the tasks to spin in get_signal() taking 100%
of CPU. Patch 1 is a preparation. Patch 2 addresses the issue.

[1] https://github.com/systemd/systemd/issues/33626

v3: Slightly adjust commit messages
v2: Move task_work_run() into do_freezer_trap()
    Correct the Fixes tag is 2/2

Pavel Begunkov (2):
  io_uring/io-wq: limit retrying worker initialisation
  kernel: rerun task_work while freezing in get_signal()

 io_uring/io-wq.c | 10 +++++++---
 kernel/signal.c  |  8 ++++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

-- 
2.44.0