From: sagi@grimberg.me (Sagi Grimberg)
Subject: v4.14-rc5 NVMeOF regression?
Date: Wed, 18 Oct 2017 08:26:05 +0300 [thread overview]
Message-ID: <07f75a37-cd25-81c1-3264-2be80bb9a763@grimberg.me> (raw)
In-Reply-To: <5fb38923-36f7-c069-5f1d-96f4a9c98248@wdc.com>
> Hello Sagi,
>
> Had I mentioned that I ran into a real deadlock and not only into a
> lockdep complaint?
No, and the output is a lockdep complaint which I thought needed
silencing.
If you ran into a real deadlock, did you have any other output from
hung_task watchdog? I do not yet understand the root cause from
lockdep info provided.
Also, do you know at which test-case this happened?
> Additionally, can you explain to me why you think the
> above patch is necessary? As far as I can see nvme_rdma_ctrl_mutex is
> not held around the ib_register_client(&nvme_rdma_ib_client) call nor
> around the ib_unregister_client(&nvme_rdma_ib_client) calls.
Its held under ib_unregister_client, my understanding is that the
_nested annotation is required for the inner mutex lock acquire.
next prev parent reply other threads:[~2017-10-18 5:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-16 22:23 v4.14-rc5 NVMeOF regression? Bart Van Assche
2017-10-17 10:01 ` Sagi Grimberg
[not found] ` <5fb38923-36f7-c069-5f1d-96f4a9c98248@wdc.com>
2017-10-18 5:26 ` Sagi Grimberg [this message]
2017-10-18 6:55 ` Christoph Hellwig
2017-10-18 16:24 ` Bart Van Assche
2017-10-22 17:16 ` Sagi Grimberg
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