linux-kernel - Re: [PATCH v2] workqueue: Fix double kfree for rescuer

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Message-ID: <7d19381c-2c51-deb4-f82f-d54bc56c6ecf@web.de>
Date:   Mon, 25 May 2020 11:50:20 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Zhang Qiang <qiang.zhang@...driver.com>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] workqueue: Fix double kfree for rescuer

> The duplicate memory release should be deleted from the implementation
> of the callback function "rcu_free_wq".

I tried to help with the selection of a better commit message.
I have taken another look also at the implementation of the function “destroy_workqueue”.

* The function call “destroy_workqueue” can be performed there in an if branch
  after the statement “wq->rescuer = NULL” was executed.

* This data processing is independent from a possible call of the
  function “call_rcu(&wq->rcu, rcu_free_wq)” in another if branch.
  Thus it seems that a null pointer is intentionally passed by a data structure
  member to this callback function on demand.
  The corresponding call of the function “kfree” can tolerate this special case.

Now I find that the proposed change can be inappropriate.

Regards,
Markus