linux-kernel - [PATCH 0/2] workqueue: Fix migrate_disable hotplug changes vs kworker affinity

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Message-Id: <20201210163830.21514-1-valentin.schneider@arm.com>
Date:   Thu, 10 Dec 2020 16:38:28 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
        mingo@...nel.org, bigeasy@...utronix.de, qais.yousef@....com,
        swood@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vincent.donnefort@....com, tj@...nel.org,
        ouwen210@...mail.com, Qian Cai <cai@...hat.com>
Subject: [PATCH 0/2] workqueue: Fix migrate_disable hotplug changes vs kworker affinity

Hi folks,

This should fix the issue reported by Qian at [1]. Dietmar mentioned some
other issue with hotplug & deadline tasks, but that's being investigated by
someone else ATM. 


I would like to mention I suspect this bug comes straight from $hell, as
I've never ever had to fight off so many (mostly unrelated) issues while
looking into it. Distro kernel being mangled, git tree corruption, periods of
heisenbugism...

Cheers,
Valentin

[1]: https://lore.kernel.org/r/ff62e3ee994efb3620177bf7b19fab16f4866845.camel@redhat.com

Valentin Schneider (2):
  stop_machine: Add caller debug info to queue_stop_cpus_work
  workqueue: Fix affinity of kworkers attached during late hotplug

 kernel/stop_machine.c |  1 +
 kernel/workqueue.c    | 24 +++++++++++++++++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

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2.27.0