linux-kernel - Re: [PATCH v2] nvme: avoid race in shutdown namespace removal

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Date:   Mon, 6 Sep 2021 09:01:04 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Daniel Wagner <dwagner@...e.de>, Hannes Reinecke <hare@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>
Subject: Re: [PATCH v2] nvme: avoid race in shutdown namespace removal

On Thu, Sep 02, 2021 at 11:20:02AM +0200, Daniel Wagner wrote:
> When we remove the siblings entry, we update ns->head->list, hence we
> can't separate the removal and test for being empty. They have to be
> in the same critical section to avoid a race.
> 
> To avoid breaking the refcounting imbalance again, add a list empty
> check to nvme_find_ns_head.

Hannes, can you look over this and run your tests on it?